长江中下游水阳江流域BZK0402孔多重地层划分及其冰后期海平面变化的沉积响应
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P534.63

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中国地质调查局地质调查项目(DD20160036,DD20190043)和安徽省自然科学基金青年项目(1808085QD116)联合资助。


Multi-stratigraphic study and response to sea-level fluctuations since the last deglaciation detected from BZK0402 core in the Shuiyang River basin, Yangtze River
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    摘要:

    研究目的】开展水阳江流域标准孔BZK0402孔多重地层划分,探讨长江支流水阳江流域冰后期海平面变化的沉积响应以及古丹阳湖的成因和形成时代。【研究方法】以岩石地层为基础,在磁性地层和年代地层的双重约束下,对BZK0402孔进行多重地层划分。对比分析BZK0402孔和长江河谷、长江三角洲等邻区钻孔。【研究结果】BZK0402孔第四纪地层可划分为中—下更新统大桥镇组、全新统芜湖组。钻孔所属的长江三角洲西缘河湖环境沉积物对末次盛冰期以来海平面升降和气候变化存在沉积响应:末次盛冰期,长江中下游河流比降大,区内河流侵蚀作用强烈,沉积物以砂砾石层为主;全新世早期,区内受冰后期海侵影响,沉积物粒度逐渐变细,沉积环境由河漫滩相向湖相过渡。植被覆盖类型以针叶林为主,林下蕨类植物生长茂盛。平原地区发育湖泊沼泽;全新世中期,海侵逐渐至最大,区内发育湖相淤泥质黏土。森林面貌以针叶-落叶阔叶混交林为主;全新世晚期至今,区内沉积物有扰动现象。【结论】长江支流水阳江河谷中不仅是全新世沉积,还发育更新世沉积。水阳江流域内古丹阳湖形成于全新世早期,其形成与全新世海侵在时间上存在一致性。

    Abstract:

    This paper is the result of environmental geological survey engineering.
    [Objective]To carry out multi-stratigraphic research on the borehole BZK0402 located in the Shuiyang River basin, and explore the sea-level fluctuations since the last deglaciation and the origin of the Paleo-Danyang Lake formation.[Methods]Based on the lithostratigraphical classification and the magnetostratigraphic and chronostratigraphical constraints, the multi-stratigraphic study on the BZK0402 core was carried out. Comparative analysis was also been made between the BZK0402 core and the cores which located in the Yangtze River valley and the Yangtze River delta.[Results]The analysis divided the BZK0402 core within Quarternary era into two units, namely the Middle-Upper Pelistocene Daqiaozhen Formation and the Holocene Wuhu Formation. The sediments through the western margin of the Yangtze River delta where the BZK0402 core lies in, also furthers our understanding of the general pattern of sea-level change since the Last Glacial Maximum (LGM), with these changes divided into four stages as follows:(1) The LGM was associated with a period of gravel and sand dominated deposition as a result of steep slopes and significant strong fluvial erosion within the Middle and Lower Reaches of the Yangtze River. (2) The Early Holocene saw a decrease in the grainsize of the sediments being deposited, with sedimentary facies changing from fluvial to lacustrine environments as a result of post-glacial transgression. This period also saw the development of pteridophyte undergrowth-dominated coniferous forest vegetation along with lakes and bog and swamp areas. (3) The Middle Holocene transgressive maximum was associated with the deposition of lacustrine clays that contain coniferous broad-leaved mixed forest vegetation. (4) These sediments are overlain by disturbed Late Holocene to present sediments, with this disturbance caused by uncertain factors.[Conclusions]The sediments in the Shuiyang River, which is a tributary of Yangzte River, not only formed within Holecene, but also formed in Pleistocene. The PaleoDanyang Lake located within the Shuiyang River Valley formed during the Early Holocene, and the period of the lake formation consistent with the Holocene transgression.

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陈忠良,张晋喆,沈仕豪,黄蒙,徐锦龙,葛海影,SimonM. Jowitt. 长江中下游水阳江流域BZK0402孔多重地层划分及其冰后期海平面变化的沉积响应[J]. 中国地质, 2022, 49(2): 655-666.
CHEN Zhongliang, ZHANG Jinzhe, SHEN Shihao, HUANG Meng, XU Jinglong, GE Haiying, Simon M. Jowitt. Multi-stratigraphic study and response to sea-level fluctuations since the last deglaciation detected from BZK0402 core in the Shuiyang River basin, Yangtze River[J]. Geology in China, 2022, 49(2): 655-666(in Chinese with English abstract).

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  • 收稿日期:2019-04-04
  • 最后修改日期:2019-10-05
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  • 在线发布日期: 2022-05-12
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