Noble gases constraints on the origin and evolution of geothermal fluids from the Yangbajain geothermal field, Tibet.
文献类型：期刊论文
| 作者 | Zhao, P; Kennedy, M; Dor, J; Xie, EJ; Du, SP; Shuster, D; Jin, J |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2001-07-01 |
| 卷号 | 17期号:3页码:497-503 |
| 关键词 | noble gas isotope geothermal fluid conceptual model Yangbajain |
| ISSN号 | 1000-0569 |
| 文献子类 | Article |
| 英文摘要 | The relative abundances and isotopic composition of noble gases in selected wells were determined to identify heat source, the relationship between shallow and deep thermal fluids, and fluid migration. The thermal fluids contain large He-4 excesses with He-3/He-4 ratios of 0.087 similar to0.259 times the ratio in air. Heat source in the region is inferred to be partial melting of the crust at depth. The dense cold groundwater pulled by gravity moves down through the pediment fault of the Nyainquentanglha Mts. Along the flow path, the water absorbs heat from wallrock and gradually loses its density. Differential densities between the thermal and cold waters drive the thermal water to shallow depths. The deep thermal fluid found only in the northern part of the field has the highest He-4-enrichment [F(He-4)-7500] and the highest He-3/He-4 ratio (0.259Ra). When the thermal water approaches the surface, the pressure in the fracture zone decreases so that the thermal water can boil CO2- and H2S-rich steam escaping from the boiling water along its ascent channel. Production wells ZK354 and ZK357, located in the upwelling zone, have slightly higher He-3/He-4 ratios and F (He-4) values than the others nearby. When the upflow of the deep thermal water is blocked, the pressure drives it laterally toward the southeast where it enters the shallow reservoir after mixing with the cold groundwater. The shallow reservoir consists of Quaternary alluvium and altered granite, opal and calcite precipitate from the thermal water to form a self-sealed alluvium cap. As the shallow thermal fluid migrates towards the southeast, helium will escape from the reservoir through a thin and loose alluvium cap while at the same time radiogenic helium produced in the underlying granite, will be added to the migrating fluid. These cause the He-3/He-4 ratios and F (He-4) values decrease from northwest to southeast. The relationship between F (Kr-84) and F (Xe-132) values implies that krypton and xenon components are of a meteoric origin for both the shallow and deep thermal fluids. |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000170244300020 |
| 出版者 | SCIENCE PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/77225]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Zhao, P |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 2.Lawrence Berkeley Lab, Berkeley, CA 94720 USA 3.Geothermal Geol Team Tibet, Lhasa, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhao, P,Kennedy, M,Dor, J,et al. Noble gases constraints on the origin and evolution of geothermal fluids from the Yangbajain geothermal field, Tibet.[J]. ACTA PETROLOGICA SINICA,2001,17(3):497-503. |
| APA | Zhao, P.,Kennedy, M.,Dor, J.,Xie, EJ.,Du, SP.,...&Jin, J.(2001).Noble gases constraints on the origin and evolution of geothermal fluids from the Yangbajain geothermal field, Tibet..ACTA PETROLOGICA SINICA,17(3),497-503. |
| MLA | Zhao, P,et al."Noble gases constraints on the origin and evolution of geothermal fluids from the Yangbajain geothermal field, Tibet.".ACTA PETROLOGICA SINICA 17.3(2001):497-503. |
入库方式： OAI收割
来源：地质与地球物理研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。