Abstract:Abstract：Based on seismic information and applying multi-cyclic tension-followed-by-compression tectonic evolution theory for China’s oil and gas-bearing basins, this paper systematically expounds the evolutionary process and formation mechanism of Eogene—Neogene geological structure in the sea area of Bohai Gulf basin. With high-quality exploration seismic information, the petroleum tectonic styles in the sea area of Bohai Gulf basin are divided into three types (penetration, separation and infiltration) and thirteen subtypes. The complex tectonic types and compound oil and gas reservoirs (fields) are described in the end of this paper.

Abstract:Abstract：Mesozoic intrusive rocks are distributed in whole Zhejiang Province, mostly coexistent with volcanic rocks. Their ages can be divided into Early Yanshanian period and Late Yanshanian period in consistency with ages of volcanic rocks. However, recent researches on biostratigraphy and chronostratigraphy show that the age of Late Jurassic–Cretaceous volcanic-sedimentary rocks should be changed to Cretaceous. The isotopic ages of the Mesozoic intrusive rocks are between 135 Ma and 85Ma. Therefore, the ages of Mesozoic intrusive rocks should be changed from Early and Late Yanshanian period to Late Yanshanian period. The authors conducted zircon SHRIMP U-Pb dating of Kailingjiao and Lichenjia granodiorite closely related to the metallic ore resources in western Zhejiang. Weighted average ages of （151±3） Ma（MSWD＝0.74） and （148±2.4）Ma（MSWD＝1.2）are interpreted as the formation time of the granodiorite, suggesting the existence of Late Jurassic intrusive rocks in western Zhejiang. This period is also important for mineralization.

Abstract:Abstract：There exist a large number of large and medium-sized lead-zinc deposits as well as a large-sized molybdenum deposit in Nyainqentanglha region of eastern Gangdise. The former deposits are considered to be products of Eocene mineralization，whereas the latter deposit is regarded as a Paleocene porphyry deposit. In the process of the evaluation of the Yaguila ore deposit, which is the largest lead-zinc deposit in the Gangdise metallogenic belt，the authors found that lead-zinc mineralization is closely related to the quartz porphyry body, and that a large-sized molybdenum vein occurs inside the intrusion body. U-Pb isotopic ages and trace element content of zircon crystals from the intrusion were measured by using LA-ICP-MS techniques. About 90% of the zircons have relatively high Th/U ratios and clear oscillatory zoning，indicating that they are of igneous origin. The acquired 206Pb/238U weighed average ages of LA-ICP-MS zircon U-Pb isotopes are 65.8±1.3 Ma (MSWD =3.0) and 68.6±1.7 Ma(MSWD=1.8), indicating that the quartz porphyry body was formed in the late Cretaceous period. Based on field investigation and an analysis of trace elements content of the quartz porphyry in combination with the Re-Os ages of the molybdenum vein obtained by previous researchers, the authors point out that both molybdenum and lead-zinc mineralizations are associated with the quartz porphyry, but Yaguila′s molybdenum was formed earlier than Sharang′s. It is concluded that not only lead-zinc mineralization but also molybdenum mineralization occurred in late Cretaceous in Nyainqentanglha region.

Abstract:Abstract：Jinchangzi dioritic porphyrite dykes widely distributed in the study area are spatially closely associated with the mineralized zone. These dykes were probably of the same source with the regional concealed acid intermediate-acid rocks and formed simultaneously with these rocks. These concealed acid rocks in the study area might have been the source and center of polymetallic mineralization, and hence a study of their formation epoch is of great significance for the ore-prospecting work in the study area. SHRIMP zircon U-Pb dating of the diorite yielded an age of （147.2±2.3）Ma （MSWD=1.6）, indicating Late Jurassic of Yanshanian period. The confirmation of Yanshanian acid activity has provided an important basis for understanding the evolution of the Mesozoic lithosphere in western China, its tectonic setting and its constraints for Weiningbeishan granite and mineralization.

Abstract:Abstract：Three main NNE-striking strike-slip faults are developed in JZ27-33 block of Liaodong Bay, i.e., Liaozhong 3 fault (or Liaozhong 1 fault), Liaozhong 2 fault and Liaodong 2 fault. These 3 faults assume en echelon distribution on the plane, with many secondary normal faults of strike-slipping nature developed between them. These normal faults strike NE or NEE and obliquely intersect main strike-slip faults, and the sharp angle between them indicates the corresponding stratigraphic moving direction on the plane. Negative flower structure is another important feature of the giant strike-slip faults. It is therefore concluded that the faults of the study area have characteristics of “duplex” on the plane and negative flower structure on the cross-section, and that the faults in JZ27-33 block of Liaodong Bay formed a typical “extensional dextral strike-slip duplex system”, with the main controlling factors composed of the dextral strike-slip and plane distribution of Tanlu fault, the multi-phase tectonic movement and the brittle sedimentary layers.

Abstract:Abstract：Duocai ophiolite is a component part of mélange ophiolite in Tongtian River area, and regionally belongs to the northward extension part of Xijinwulan-Jinsha River suture zone. Each Duocai ophiolite occurs in the form of tectonite and rock chips exposed as small and scattered outcrops, but has fairly complete kinds of rocks, mainly composed of diallage-peridotite, pyroxenite monoclinic pyroxinite, gabbro, basalt, diabase and siliceous rocks, with no mantle peridotite. Ophiolite components assume tectonic contact with wall rocks. Diallage-peridotite is characterized by rich MgO, poor TiO2 and P2O5, with no or only weak negative Eu anomaly. Diallage-peridotite is an important rock of SSZ type. Gabbro has high TiO2 and Al2O3 content; basalt and diabase have similar characteristics. Th/Ta of basalt has an average value of 1.78, Ta/Hf＞0.15, and Ta/Hf=0.15-0.2, and characteristics of these elements are similar to those of oceanic intraplate basalts. Al2O3/(Al2O3+Fe2O3) ratio of siliceous rocks is 0.9, (La/Ce)N is 1.81, showing characteristics of a land-based sea. Based on the above-mentioned characteristics in combination with the age of ophiolite as well as tectonic setting discrimination diagrams of basalt and diabase, the authors hold that Duocai ophiolite was formed in a subduction zone tectonic setting.

Abstract:Abstract：Based on field geological survey and an analysis of such environmental indicators as grain sizes, magnetic susceptibility and carbonate content in combination with ESR age data provided by previous researchers, this paper discusses the variation of the depositional environment in the Gaozhuang Formation during the early Pliocene. The analytical results show that, in the early Pliocene (5.25～3.16 Ma), the Yushe Basin was mainly warm and wet in climate, with unsteady short-term drought, and its paleolake underwent three seasonal changes of the water level from steady increase to wavy increase. During 5.25～4.50 Ma, the basin evolved into the first strong rift stage, its paleolake underwent a change of its water level from steady increase to wavy increase, forming Taoyang Member strata. During 4.44～3.89 Ma, the basin evolved into the steady rift stage, its paleolake underwent a change of its water level from steady stabilization to wavy increase, forming Nanzhuanggou Member strata. During 3.81～3.16Ma, the basin evolved into the second strong rift stage, its paleolake underwent a change of its water level from steady increase to wavy balance, forming Culiugou Member strata, and the extreme dry climate occurred in 3.50～3.33Ma, after which the climate became warm and wet.

Abstract:Abstract：The lacustrine basin deep fault depression period in the northern area of the western sag of Liaohe depression can be divided into five stages, namely, initial fault depression stage, fast subsiding stage, stable subsiding stage, hard subsiding stage and short time returning stage. During the initial fault depression stage, the alluvial fan, turbidite fan and lacustrine deposit were developed in northern and central parts of the study area. When the fast subsiding stage came, the sedimentary area expanded southward, with the main sedimentary facies being turbidite fan and lacustrine deposit. When the evolution entered into the stable subsiding stage, the whole study area was covered by water, and fan delta, turbidite fan and lacustrine deposit constituted the main deposition forms. The braided stream delta, turbidite fan and lacustrine deposit were the main types at the hard subsiding stage. At last the short time returning stage came, during which the northern part was outcropped and experienced denudation, whereas braided stream delta, fan delta and lacustrine deposit controlled the southern part. It is concluded that the subsiding center, deposition center, deposition styles, sedimentary facies types and their space overlying were all affected by the evolution of the lacustrine basin. At the same time, the development of the sand reservoir and the oil and gas traps were all influenced by the evolution of the lacustrine basin. In general, the structural traps, lithologic traps and combination traps lay in the abrupt slope, while the stratigraphic traps main lay in the slight grade of the lacustrine basin.

Abstract:Abstract：Liwan deepwater area located in Baiyun Sag of Zhujiang River mouth basin is a potential area for oil and gas exploration. The Lower Member of Zhujiang Formation in the study area is regard as a deepwater fan based on a detailed study of petrologic and paleontological assemblage characteristics. The deepwater fan in Liwan area can be divided into two types, i.e., early basin fan deposit and late slope fan deposit. Both types of the deepwater fan have developed granular flow, sandy debris flow, low-density turbidity flow and other gravity currents along the slope, with the development of a little internal wave and contour current deposit. Sandy debris flow is the mainly sedimentary type of channel sand bodies of the two deepwater fans, and there are also reverse grading, positive grading, parallel bedding and horizontal bedding. In addition, many liquefaction and fluidization structures and biological escape trace in graded bedding as well as abundant burrow pores and bioturbation in horizontal bedding are observed. The two types of deepwater fan have different sedimentary and paleontological characteristics. There is silicious pea gravel in channel sandstone and globigerina fossil in interdistributary bay mudstone of the basin fan. Slope fan deposit contains rich coccoliths and globigerina fossil, and is characterized by carbon mudstone scraps in channel sandstone. Coccoliths and globigerina fossil in the slope fan have obvious characteristics of submerged corrosion, which means that the slope fan has deeper water than the basin fan. The two types of deepwater fan have similar distribution of gravity currents, i.e., the evolution from proximal granular flow to sandy debris flow, then to high-density turbidity flow and finally to low-density turbidity flow; in other words, from continental shelf slope turned directly to the basin.

Abstract:Abstract：During most time of Middle Devonian-Late Permian period, the Nanpanjiang depression was in an environment of isolated carbonate platform surrounded by a deep sea trough and formed by extensional faulting during the evolution of the Nanpanjiang Ocean. The platform was a land platform during the period from late Early Carboniferous to Late Carboniferous. The field exploration of Late Paleozoic strata in Longlin area revealed six kinds of sedimentary facies types in the isolated platform-trough facies region, i.e., carbonate tidal flat, restricted platform, platform margin beach, platform margin reef, shelf between platforms, and basin between platforms，and established a sedimentary model for the unique isolated platform. The current study shows that its evolution experienced four stages of development, namely, marginal carbonate platform（D1-D2）, isolated carbonate platform（D3-C11）, land platform（C21-C2） and isolated-drowned carbonate platform (P), implying that during the Late Paleozoic period, the Nanpanjiang basin evolved from rifting to a small oceanic basin with intense expansion and subsidence, while the southern margin of the Yangtze Platform experienced extension and breaking splitting.

Abstract:Abstract：Based on a systematic study of the conodont biostratigraphic data in the former Oepikodus evae zone of the Fuluoian in the Huanghuachang section, the authors discussed several problems concerning the apparatus classification of some important multi-element conodonts: Stolodus stola, L. gladiatus, O. intermedius, Oepikodus communis, Prioniodus honghuayuanensis. The upper part of the former Oepikodus evae zone, without the zonal index fossil Oepikodus evae itself in the Huanghuachang section, conflicts with the definition of interval zone and range zone in International Stratigraphic Guide (2000). Through further collecting conodont samples, checking and revising some of the conodont general and species in the former O. evae zone, the authors analyzed the vertical conodont distribution. The interval from the base of Honghuayuan Formation to the top of Lower Member of Dawan Formation was divided to 4 interval zones: Prioniodus honghuayuanensis zone, O. evae zone, Trapezognathus diprion zone and Baltoniodus cf. B. triangularis zone, and 3 subzones: Stolodus stola subzone, Oepikodus intermedius subzone and Microzarkodina sp.A, in upward succession. The Prioniodus honghuayuanensis zone, Trapezognathus diprion zone and Baltoniodus cf. B. triangularis zone are new zones, and the Oepikodus intermedius subzone and Microzarkodina sp.A are new subzones in this paper. The former Stolodus stola subzone is revised herein. Abundant warm-water fauna conodonts, including Reutterodus andinus，Oepikodus intermedius, Juanognathus variabilis, were found in Trapezognathus diprion zone -Baltoniodus cf. B. triangularis zone in the Huanghuachang section; consequently, these two zones could be serving as a standard for the stratigraphic division and correlation of the relevant strata in central continent of North America. Furthermore, the above bio-stratigraphic division scheme can supply reasonable advice for the precise stratigraphic division and correlation for different biogeographical zones among different continents around the world.

Abstract:Abstract：The quantitative prognosis of thin interbedded sandbodies is one of the difficulties in sedimentological research. The beach-bar is a typically thin interbedded sand body in shore-shallow lake whose prediction and exploration are very difficult. Based on the study of sedimentary characteristics, plane distribution and controlling factors of beach-bar in the upper 4th submember of the Paleogene Shahejie Formation in Dongying Sag, the authors consider that the development and distribution of beach-bar are mainly controlled by different wave zones, i.e., the surfing-backflowing zone controls pebble beach-bar and longshore beach-bar, the breaker zone controls nearshore beach-bar and the broken zone controls infralittoral shore beach-bar. Based on the wind-dynamic sandbodies distribution model and the analysis of wave parametric variation in different zones, the authors established the quantitative prognostic models of the sand body in the broken zone and the breaker zone, and calculated the thickness and width of sandy bar distribution in nearshore and infralittoral shore. In addition, using wind-dynamic mixed microtopography recovering technique, the authors obtained the extension length of the sandy. By employing statistics of single layer bar thickness and well connecting correlation, the authors examined the predicted results and proved them to be reliable and reasonable. It is demonstrated that the 6-8 wind scale is favorable for the development of the beach-bar. This method provides a new insight for the prediction of thin sand body and is useful to the exploration of subtle reservoirs; nevertheless, it is not suitable for the prediction of the thin sand body mainly controlled by the provenance.

Abstract:Abstract：Using theories of classic sequence stratigraphy and modern sedimentology, the authors analyzed the data of drill holes, loggings, cores and palaeontology with the purpose of investigating sedimentary characteristics and coal accumulation of the Badaowan Formation in the southern margin of Junggar basin. Based on sequence stratigraphic analysis of the single well, the authors divided Badaowan Formation into two sequences, namely SQ1 and SQ2, both of which have the tripartite structure, corresponding respectively to the lower and upper segment of Badaowan Formation in the coalfield. According to the well-connecting profile, the authors established sequence stratigraghic framework, then made a plane analysis of the sedimentary facies of each system tract, and finally analyzed the coal accumulation. It is found that the principal seam of the coalfield developed mainly at the last stage of LST and the initial stage of HST, and the delta plain area is the optimum place for coal accumulation. These results will certainly provide some guidance for the further establishment of coal exploration area.

Abstract:Abstract：The Xitieshan superlarge Pb-Zn deposit is located in the north margin of Qaidam basin, Qinghai Province, and originally contained about 50 million tons of ore with the grade of 8% Zn and 10% Pb. It was formed in a rift basin in the Ordovician period. It has been recognized that there is a complete exhalation sedimentary system that includes breccias pipe-stockwork, non-bedded and bedded ores and marble from exhalation sediments. Pb isotope compositions of sulfides can be divided into two groups, one consists of most of the samples and includes most of the bedded ore and all of the non-bedded ore, pipe breccias and veins in marble under the non-bedded ore. They assume a linear array characterized by (207Pb/204Pb)= 1.254(206Pb/204Pb）-7.296 with the regression coefficient of 0.977 (n=19). The other group includes carbonaceous schist occurring above the marble and non-bedded ore and pyrite from bedded ore, and assumes a linear array of （207Pb/204Pb）=0.123（206Pb/204Pb）+13.347 with the regression coefficient of 0.902 (n=5). The Pb isotope composition of the intersection point of the two arrays is 206Pb/204Pb=18.253，207Pb/204Pb=15.590，and 208Pb/204Pb=38.370. A study of Pb isotope geochemistry suggests that the first array, consisting of most of the ore samples, represents a two-component mixing line in which the less radiogenic component can be identified as orogenic lead reservoir probably coming from Tianjianshan Group through the exhalation brine. The radiogenic end-member can be identified as upper crust lead reservoir probably derived from seawater. The lead and the ore-forming metals mainly came from the exhalative brine during the sedimentary-exhalative metallization, with a small amount derived from the seawater. Precambrian metamorphic rocks might also have contributed a little material in the distal vents of the exhalative system or during the intermission of exhalation. The bedded ore body and the non-bedded ore body, which endured the same geological evolution, were all formed during the exhalative sedimentation. Instead of being generated from the late reformation, the non-bedded ore body was probably hydrothermal ore body without experiencing submarine eruption. The mineralization in Duancenggou was relocated along the schistosity in the late reformation, and the lead isotope was further homogenized.

Abstract:Abstract：The Jiashengpan lead-zinc-sulfur deposit is located in the Langshan-Zhaertaishan mineralization belt on the northern margin of the North China Platform. Its ore bodies are hosted in black shale strata of the Mesoproterozoic Zhaertaishan Group. Lead isotopic composition of sulfides in ores can be classified into two groups (Group A and Group B). Group A is characterized by lower radiogenic lead with 206Pb/204Pb ranging from 15.889 to 16.257, 207Pb/204Pb ranging from 15.158 to 15.455, and 208Pb/204Pb ranging from 35.112 to 36.271, whereas Group B is characterized by higher radiogenic lead with 206Pb/204Pb ranging from 17.871 to 18.990, 207Pb/204Pb ranging from 15.509 to 15.672, and 208Pb/204Pb ranging from 37.525 to 38.770. It is evident that the sulfides in ores can be divided into the early depositional ones having fine-grained, layered and disseminated features and the later ones having coarse-grained and veinlike features. Both of them contain lead isotope compositions of Group A and Group B, but the former consists mainly of the features of Group A whereas the latter consists mainly of the features of Group B. Based on tectonic patterns of lead isotope and related parameters, it can be concluded that the lead of Group A was mainly derived from the upper crust and the orogenic belt with the participation of some mantle-derived lead. The ore-forming materials of Group A were derived from the old basement strata during the main ore-forming period, whereas the lead of Group B was mainly derived from the late hydrothermal event with some influence of the Varisian granite to the north of the ore bodies. The lead of the Jiashengpan ore deposit has a multi-source mixing structure.

Abstract:Abstract：Located on the edge of the metamorphic belt formed by paleo-Kumishi ocean subduction, the Baoertu copper deposit is controlled by fault structures. The wall rocks are composed of a set of medium-deep grade metamorphic rocks, and REE geochemistry shows that their ΣREE content is high, with LREE/HREE being 2.46～16.86, and there exists obvious differentiation between LREE and HREE, with the enrichment of LREE relative to HREE and the existence of negative Eu anomaly. The REE patterns assume right inclination. By comparison, the ores have relatively low ΣREE content, with LREE/HREE being 0.06～0.97, and show significant differentiation between LREE and HREE characterized by relative enrichment of HREE. The REE patterns show left inclination, similar to things of the leucosome of migmatite. These REE characteristics suggest that the ore-forming process of the Baoertu copper deposit was related to hybirdization. Combined with the characteristics of the ore field geology, this paper holds that the Baoertu copper deposit is genetically of the metamorphic hydrothermal type.

Abstract:Abstract：The Tuanjiegou gold deposit is a large-size rock gold ore deposit lying in granite- porphyry. As the main ore bodies of this ore deposit have been found in the granite-porphyry, the prospecting and evaluation work in this area has long been mainly carried out within the granite-porphyry. A synthetic analysis and comparative study of the distribution model of REE, the characteristics of sulfur isotope and the temperature of fluid inclusions of the ores and rocks in the ore district and its surrounding areas show that, although the gold deposit is closely related to the granite-porphyry in space, they have no genetic relationship. In this paper, the ore-controlling regularity of the ore deposit is analyzed and summarized systematically, and a new idea is put forward arguing that the structure of the inner circular belt of the volcanic and sub-volcanic edifice is the main ore-controlling structure element. In addition, some favorable ore-prospecting segments in the Tuanjiegou gold orefield are delineated.

Abstract:Abstract：Volcanoes, mud volcanoes/mud diapers and gas traps not only serve as windows of tectonic movement and symptoms of fluid movement in the deep earth but also have intimate relationship with the migration and accumulation of oil and gas. The differences between volcanoes, mud volcanoes and mud diapirs constitute the material base and dynamics. The volcanoes serve as the symptom of deep earth dynamic system and their material base stems from the upward movement of the mantle and the igneous magma in the depositional basin over the crystalline basement, whereas the mud volcanoes/mud diapers are mud diapirs of the uncompacted argillaceous shale whose material base was the heavy uncompacted argillutite. The gas trap is the trace of gas upward migration or gas layer seismic reflection distortion. Volcanoes, mud volcanoes, mud diapirs have origin-coupled relationship with the migration and accumulation of oil and gas and control the distribution and accumulation of the oil and gas.

Abstract:Abstract：Based on a large number of borehole temperature data，the authors systematically studied the distribution characteristics of the shallow geothermal field in Beijing plain area and several influencing factors. The average geothermal gradient of this area（0~300 m） is 7.2℃/100 m，higher than that of deep bedrock whose geothermal gradient ranges from 2.5 to 3.0℃/100 m. Terrestrial heat flow values range from 66.35 to 84.14 mw2/m2. The relatively high level of heat flow values indicates that the lithosphere is relatively thin and hidden faults are existent. There is a close relationship between the current shallow geothermal field and the deep geothermal field in this area. The distribution of the shallow geothermal field is basically consistent with the strike of major hidden active faults in the plain area，mainly controlled by new tectonic movement. In addition，groundwater and the lithology and structure of rock and soil are also important influencing factors.

Abstract:Abstract：Studies show that the carbon isotopic characteristics of the components of chloroform bitumen “A” in Jurassic hydrocarbon source rocks were mainly affected by parent materials and sedimentary environments in Jurassic in south Qiangtang basin. For the components of chloroform bitumen “A” in Xiali Formation hydrocarbon source rocks, the carbon isotopic compositions are usually relatively heavy, while for the components of chloroform bitumen “A” in Buqu Formation hydrocarbon source rocks, the carbon isotopic compositions are usually comparatively light. In addition, the carbon isotopes commonly show reverse phenomenon, and the reversal of δ13C in Xiali Formation source rocks finds expression in the sequence of saturated hydrocarbons < non-hydrocarbons < aromatics < asphaltenes, mainly controlled by organic matters, whereas the reversal of δ13C in Biqu Formation source rocks finds expression in the sequence of non-hydrocarbon>asphaltenes> saturated hydrocarbons> aromatic hydrocarbons, mainly related to biological degradation.

Abstract:Abstract：Based on a study of gas components and carbon isotopes and an integrated research on the actual geological conditions, the authors investigated the genetic types and causes of natural gas distribution，and divided the gas source contribution and source characteristics in detail into different segments. The results show that in the study area there are three types of sources and origins of natural gas, i.e., self-storage type gas derived from Xujiahe coal serial hydrocarbon rocks, mixed type gas mainly derived from coal source rocks, and gas mainly derived from deep source. It seems that the gas mainly comes from deep-seated sources.

Abstract:Abstract：In this paper soil elements in topsoil of the sewage irrigation area in Shijiazhuang are evaluated, with three aspects of soil quality taken into account. Studies suggest that elements reflecting soil fertility quality are in a rich or desirable state except for Mo, Co, alkali-hydrolyzable N, available phosphorus and effective Mo which are relatively deficient. The concentrations of heavy metal elements which can reflect the soil environment quality are all below the secondary standard limits in "soil environmental quality standard" (GB-15618-95), with the concentrations of Cu, Ni, As, Hg, Pb completely reaching the senior standard. A morphological analysis of heavy metal elements show that the bio-availability and potential harmfulness of Cd are relatively serious and hence this element may be the most ecologically harmful element in the study area. Among the elements which reflect the quality of soil health, F is in abundant or desirable state while I is in relatively deficient state.

Abstract:Abstract：Selenium is an essential trace element which is beneficial for people’s health and has significant cancer-fighting properties. More and more people have attached importance to this element, which has produced great economic efficiency. The inadequateness or excessiveness of selenium content and different forms of selenium in soil can affect the plant growth directly and then bring about further influence on the health of human beings and animals by food-chain. So It’s significant to study the transport and transformation of selenium in the soil profile. In this paper, 4 soil profile samples of PM2, PM8, PM9, PM11 were collected from Chengdu economic zone in Sichuan Province according to different soil types. The authors analyzed the content of total selenium and the available selenium content in the soil profiles. By cultivating soil solution the authors also obtained the total selenium and the available selenium content both in soil solution and in soil debris. Then the authors calculated the distribution coefficient of selenium in the soil solution. The result indicates that the total selenium and available selenium were well concentrated at the surface of these four soil profiles. The content of available selenium shows a significantly positive correlation with the total selenium and a positive correlation with the soil organic matter. By calculating the distribution coefficient of selenium (Ki) in different types of soil, the authors have reached the conclusion that the distribution coefficient of selenium is gradually concentrated from deep to top soil. Furthermore, the coefficient of selenium also shows a positive correlation with soil pH and the soil organic matter. This study also suggests that the total selenium, the soil pH, the soil organic matter and the clay fraction are the main factors affecting the transport and transformation of selenium to plant in different types of soils. The transport of selenium with the migration of the soil solution in the vertical soil profiles is not obvious.

Abstract:Abstract：From November 2007 to November 2008, the authors collected 48 samples of atmospheric dustfal in the southern plain of Hebei Province. All dustfall samples were analyzed for concentrations of Al, K, Ca, Cr, Cd, Pb, Se, Mo, I, F and S. The calculation of related coefficients and enrichment factors indicates that the primary source of the atmospheric dustfall is soil in the southern farmland, and some elements may be polluted by coal burning. The calculation of annual fluxes of elements show that the atmosphere quality of southern plain is obviously lower than that of the plain area of Beijing. The multi-elements annual fluxes are maximum in Changzhou City, and minimum in Handan City. The elements assemblage in Shijiazhuang City is characterized by Cd, Hg, Mo and Se, with the elements annual fluxes being maximum.