Helium isotopic compositions of groundwater in the fault zones of Hexi Corridor Basin, Northwestern China

摘要：

We have measured helium isotopic compositions of groundwater hoping to clarify the origins of helium in the groundwater and to establish a relationship between the groundwater system and fault zones within the Hexi Corridor. The R/Ra values indicate that 3He from the groundwater in the northern boundary fault of the Qilian Shan (NQF) is derived primarily from the mantle with a mixture of atmospheric helium. Magma trapped mantle-source 3He and carried it along as it rose into the crust along the faults. In contrast, helium in the Xigaze-Langshan Fault Zone (XFZ) is derived mainly from the crust with mixing of atmospheric helium.Caledonian granites are broadly distributed in the water-bearing layers, resulting in the sharp increase of 4He contents produced from the decay of radioactive U and Th elements contained in these rocks.

关键词： Hexi Corridor groundwater helium isotope fault zone earthquake

作者: X.Zhao J.Chen W.Rao X.Sheng Z.Su L.Chen

作者单位: Geotechnical Research Institute of Hohai University, Nanjing, China Geotechnical Research Institute of Hohai University, Nanjing, China;Isotope Hydrology Institute of H Isotope Hydrology Institute of Hohai University, Nanjing, China State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering,Hohai University, Nanjin

会议类型: 国际会议

会议名称: 第十二届水-岩相互作用国际研讨会(P0roceedings of the 12th International Symposium on Water-Rock Interaction)

会议地点: 昆明

会议语种:英文

页码: 811-815

在线出版日期: 2007-07-31（万方平台首次上网日期，不代表论文的发表时间）