| 西藏羊八井地热田水热蚀变的时空演化特征 |
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| 引用本文： | 胡志华,高洪雷,万汉平,张松,郝伟林,吴儒杰.西藏羊八井地热田水热蚀变的时空演化特征[J].地质论评,2022,68(1):359-374. |
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| 作者姓名： | 胡志华 高洪雷 万汉平 张松 郝伟林 吴儒杰 |
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| 作者单位： | 核工业北京地质研究院,北京, 100029;中核集团地热勘查技术研究中心,北京,100029 |
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| 基金项目： | 本文为中核集团集中研发项目“地热勘查开发利用关键技术研究\[编号：中核科发﹝2019﹞419号\]的成果 |
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| 摘 要： | 西藏亚东—谷露裂谷中—北段的羊八井地热田是我国著名的高温地热田,研究其水热蚀变的时空演化有助于更好地认识藏南地热的发育特征。通过对羊八井地热田及其水热蚀变岩开展地表调查、显微特征与X衍射分析等工作,总结了其主要蚀变类型特征,划分出黄褐色蚀变中心带、灰白色中强蚀变带、灰白色中等蚀变带和浅灰白色弱蚀变带4个不同的水热蚀变带,并区分出红褐色—黄褐色蚀变期、灰白色蚀变期和淡黄色—灰色蚀变期共3期蚀变。研究结果揭示,羊八井地热田高温地热活动中心一直在北区硫磺沟区域,其水热蚀变活动主要受亚东—谷露裂谷内部的活动断裂构造控制,并与断裂构造活动具同步性;地热水的排泄方式早期为沿北东向断裂构造直接排泄,晚期为经浅层第四系径流后再排泄,由直接排泄向间接排泄转变;中高温地热水的排泄区由北区硫磺沟地区向南区藏布曲迁移。根据研究结果推断,硫磺沟区域的北东向断裂与北西向断裂交汇区可作为羊八井热田北区深部地热勘查的主要方向。
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| 关 键 词： | 羊八井地热田 水热蚀变 蚀变分带 活动断裂 亚东—谷露裂谷 |
| 收稿时间： | 2021/7/27 0:00:00 |
| 修稿时间： | 2021/12/8 0:00:00 |
Temporal and spatial evolution of hydrothermal alteration in the Yangbajing Geothermal Field,Xizang(Tibet) |
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| HU Zhihu,GAO Honglei,WAN Hanping,ZHANG Song,HAO Weilin,WU Rujie.Temporal and spatial evolution of hydrothermal alteration in the Yangbajing Geothermal Field,Xizang(Tibet)[J].Geological Review,2022,68(1):359-374. |
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| Authors: | HU Zhihu GAO Honglei WAN Hanping ZHANG Song HAO Weilin WU Rujie |
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| Institution: | (Beijing Research Institute of Uranium Geology,Beijing,100029;CNNC Geothermal Exploration Tecnology Center,Beijing,100029) |
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| Abstract: | Yangbajing Geothermal Field,located in the northern part of Yadong—Gulu Rift in Xizang(Tibet)is a famous high-temperature geothermal field in China.To better understand the development geothermal characteristics in the south Tibet,it is essential to study the temporal and spatial evolution of hydrothermal alteration.Based on the surface investigation,microscopic observations and X-ray diffraction analysis of the Yangbajing Geothermal Field and its hydrothermal altered rocks,the major alteration types and characteristics are summarized.The authors subdivided four different hydrothermal alteration zones:yellowish-brown center zone,grayish-white intensely altered zone,grayish-white medium altered zone and light-grayish weakly altered zone.There are three stages of alteration:the reddish-brown to yellowish-brown alteration stage,grayish-white alteration stage and light yellowish-gray alteration stage.The results show that the high-temperature geothermal activity center of Yangbajing Geothermal Field has always been in the sulfur valley of the north area,and its hydrothermal alteration activity is mainly controlled by the active fault in Yadong—Gulu rift,and is also synchronous with the fault activity.In the early stage,the geothermal water is directly discharged along the NE-trending faults,whereas in the late stage,it is discharged after runoff through the shallow Quaternary stratum,resulting in shifting from direct discharge to indirect discharge.The discharge area of medium—high temperature geothermal water migrated from the northern sulfur valley to the Zangbuqu area in the south.According to the results,we concluded that the intersection of NE-trending faults and NW-trending faults in the Liuhuanggou area can be regared as the main target for deep geothermal exploration in the north part of Yangbajing Geothermal Field. |
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| Keywords: | Yangbajing Geothermal Field hydrothermal alteration alteration zoning active fault Yadong—Gulu rift |
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