摘要
稻城地区位于青藏高原东南缘的川滇地块北部,为揭示该区域温泉流体地球化学特征以及其和地震活动性之间的关系,本次研究采集了稻城地区6个温泉的水样以及逸出气体样品。对温泉水中离子组分和浓度,温泉逸出气体组分及气体同位素进行了测试,得到以下认识。研究区温泉水化学类型主要为HCO_(3)-Na和HCO_(3)-Na·Ca型,通过阳离子温标估算热储温度在74℃~159℃之间,循环深度在2.2 km~5.0 km之间。温泉气体中CO_(2)主要是由储层中的碳酸盐岩受热分解或溶解产生的,氦来自幔源组分的比例较低,在0.4%~2.4%之间,研究区的温泉是由沿断裂带渗入的大气降水经地壳深部的热源加热形成的。在稻城地区,循环深度以及幔源气体贡献率等不同的温泉流体地球化学特征与地震活动性之间有很好的对应关系,并且研究区地震活动性要弱于周缘鲜水河断裂地区等深部流体上涌地区。同时在区域尺度上,未来位于断裂交汇部位的稻城仲堆温泉一带的地震活动性最值得关注。
Daocheng area is located in the northern part of Sichuan-Yunnan block on the southeastern margin of Qinghai-Tibet Plateau.In order to reveal the geochemical characteristics of hot spring fluid and the relationship between the fluid and seismic activity in this area,hot spring water samples and gas samples from six hot springs in Daocheng area were collected,and the ion components and concentrations in hot spring water,gas components and gas isotopes of hot spring were tested.The following conclusions are obtained:the chemical types of hot spring water in the study area are mainly HCO_(3)-Na and HCO_(3)-Na·Ca types.The Reservoir temperature is estimated to be between 74℃and 159℃by cationic temperature scale,and the circulation depth is between 2.2 km and 5.0 km.The CO_(2)in the hot spring gas is mainly generated by the decomposition or dissolution of the carbonate rocks in the reservoir,and the proportion of helium from the mantle component is relatively low,ranging from 0.4%to 2.4%.The hot spring in the study area is formed by the heating of the deep crustal heat source caused by the atmospheric precipitation penetrating along the fault zone.In Daocheng area,the geochemical characteristics of hot spring fluid such as circulation depth and contribution rate of mantle-derived gas have a good correlation with seismic activity,and the seismic activity of the study area is weaker than that of deep fluid upwelling areas such as the surrounding Xianshuihe fault area.At the same time,in the regional scale,the future seismic activity in the Zhongdui hot spring area of Daocheng,located at the intersection of faults,is the most noteworthy.
作者
王昱文
周晓成
何苗
天娇
李静超
董金元
颜玉聪
刘峰立
姚炳宇
曾召君
陈曲菲
WANG Yuwen;ZHOU Xiaocheng;HE Miao;TIAN Jiao;LI Jingchao;DONG Jinyuan;YAN Yucong;LIU Fengli;YAO Bingyu;ZENG Zhaojun;CHEN Qufei(United Laboratory of High-Pressure Physics and Earthquake Science,Institute of Earthquake Forecasting CEA,Beijing 100036,China;Economic and Technological Development Zone Brigade,Fire and Rescue Detachment of Urumqi,Fire and Rescue department of Xinjiang,Urumqi 830009,China)
出处
《沉积与特提斯地质》
CAS
CSCD
北大核心
2023年第2期373-387,共15页
Sedimentary Geology and Tethyan Geology
基金
中国地震局地震预测研究所基本科研业务费(CEAIEF2022030205,CEAIEF20220507,CEAIEF20220213,CEAIEF2022030200,2021IEF0101,2021IEF1201)
国家重点研发计划(2017YFC1500501-05,2019YFC1509203,2018YFE0109700)
国家自然科学基金面上项目(41673106,42073063,4193000170,U2039207)
IGCP项目724。
