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引用本文:肖 琼1, 2 王 鹏2, 3 沈立成2 薛 梅4. 非火山地热区玛旁雍热田土壤CO2脱气研究[J]. 中国地质, 2015, (6): 2019.
XIAO Qiong1, 2, WANG Peng2, 3, SHEN Li-cheng2, XUE Mei4. Soil CO2 degassing process and flux from the Mapamyum non?volcanic geothermal region[J]. Geology in China, 2015, (6): 2019(in Chinese with English abstract).
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非火山地热区玛旁雍热田土壤CO2脱气研究
肖 琼1, 2 王 鹏2, 3 沈立成2 薛 梅41,2,3,4
1.国土资源部/广西岩溶动力学重点实验室, 中国地质科学院岩溶地质研究所, 广西 桂林 541004;2.西南大学地理科学学院, 重庆 北碚 400715;3.中山大学地理与规划学院水资源与环境系, 广东 广州 510275;4. 青海油田采油一厂开发地质研究所, 青海 茫崖 816400
摘要:
提要: 地热活动是地球脱气的重要形式之一, 其过程常伴随大量温室气体排放。选取非火山地热区西藏玛旁雍热田作为研究对象, 基于菲克扩散定律对地热田区土壤CO2脱气量进行评估。结果表明: 该区一般土壤CO2脱气通量为0.167~0.771 kg/(m2·a), 含喷气孔区域土壤CO2脱气通量为2.054~7.877 kg/(m2·a), 含喷气孔地区的土壤CO2脱气通量是一般土壤脱气量的18.9倍; 与全球火山区土壤脱气量(0.001~2.25 Mt/(m2·a))相比, 其值显著偏低; 但比青藏高原高寒草原生态系统土壤的CO2排放量(187.46 g/(m2·a))大。结合区域地质背景推测地热系统中的CO2含量主要来源于岩浆脱气和热液同长石等围岩矿物的蚀变反应。区内土壤CO2的低脱气通量受透水性较差的碎屑岩沉积盖层约束。
关键词:  土壤脱气  CO2通量  脱气机制  非火山地热区  玛旁雍热田
DOI:
分类号:
基金项目:国家自然科学基金青年基金项目(41302213)、广西自然科学基金青年基金项目(2013GXNSFBA019221)和中国地质科学院地质调查项目(12120113006700)联合资助。
Soil CO2 degassing process and flux from the Mapamyum non?volcanic geothermal region
XIAO Qiong1, 2, WANG Peng2, 3, SHEN Li-cheng2, XUE Mei41,2,3,4
1.Institute of Karst Geology, CAGS, Karst Dynamics Laboratory, M L R, Guilin 541004, Guangxi, China;2. School of Geographical Sciences, Southwest University, Chongqing 400715, China;3. Department of Water Resource and Environment, Geography and Planning School of Sun Yat?Sen University, Guangzhou 510275, Guangdong, China;4. Institute of Petroleum Geology and Exploitation, 1st Oil Production Plant of Qinghai Oil Field, CNPC, Mangya 816400, Qinghai, China
Abstract:
Abstract: Geothermal activity is an important form of earth degassing, which is frequently accompanied by a large number of greenhouse gas emissions. Taking Mapamyum of non?volcanic geothermal region in Tibet as a study case, the authors evaluated the degassing flux of geothermal soil CO2 based on the Fick's law of diffusion. The results indicate that the soil CO2 degassing flux is from 0.167 to 0.771 kg /(m2·a), while the fumarole CO2 degassing flux is from 2.054 to 7.877 kg/(m2·a) which is 18.9 times that of the soil; Compared with global volcanic soil (0.001 ~ 2.25 Mt/(km2·a), the soil CO2 degassing flux is significantly lower in value but larger than the Alpine grassland ecosystem soil CO2 emissions in the Tibetan Plateau (187.46 g(m2 a)?1)). Combined with tectonic setting, the authors evidently hold that CO2 in the geothermal system is mainly derived from magma degassing and hydrothermal fluid with walk rock alterations such as feldspathization. The low zone of soil CO2 degassing flux is constrained by the poor permeability clastic sedimentary cover.
Key words:  soil degassing  CO2 flux  degassing mechanism  non?volcanic region  Mapamyum geothermal field