| 西藏羊应乡地热田形成特点及评价探讨 |
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| 引用本文： | 李家振,孙善平.西藏羊应乡地热田形成特点及评价探讨[J].现代地质,1994,8(1):49-56,T001. |
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| 作者姓名： | 李家振 孙善平 |
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| 作者单位： | 中国地质大学地矿系，石油勘探开发科学研究院，中信国际宝石有限公司 |
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| 摘 要： | 羊应乡地热田内出露的有关岩石，在地表以火山熔岩和火山碎屑岩为主，地表以下则有大量黑云母花岗斑岩分布。热田的形成与火成岩有较密切的关系，地表热显示的类型多种多样，有热泉、沸泉、沸喷泉、喷气孔、冒气地面和泉华等。根据其出露特征可分为四个区。经铀系法测定其水热活动的同位素年龄为１４．６Ｍａ左右，结合地层对比，认为水热活动时间为中更新世晚期。区内近Ｓ—Ｎ向的主要大断裂和两组次一级的断裂是水热活动的主要通道和主要控热构造裂隙。初步认为热田应属与岩浆活动有关的地热田、目前热田处于产热与散热大致平衡或散热略大于产热的基本平衡状态，探明的热水温度已高达２０７℃。
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| 关 键 词： | 羊应乡，地热田，地热显示，中更新世 |
A STUDY ON FORMATON CHARACTERISTICS AND APPRAISAL OF THE YANGYING VILLAGE GEOTHERMAL FIELD, DANGXIONG, TIBET |
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| Li Jiazhen, Sun Shanping.A STUDY ON FORMATON CHARACTERISTICS AND APPRAISAL OF THE YANGYING VILLAGE GEOTHERMAL FIELD, DANGXIONG, TIBET[J].Geoscience——Journal of Graduate School,China University of Geosciences,1994,8(1):49-56,T001. |
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| Authors: | Li Jiazhen Sun Shanping |
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| Abstract: | The rocks that crop out from the geothermal field in Yangying village mainly consist of volcanic lavarocks and pyroclastic rocks on the earth surface, and there are a great deal of biotite granite porphyry under the earth surface. The formation of the geothermal field is comparatively close related to igneous. The types of the geothermal feature on the earth surface are various, including hot spring, boiling spring, boiling-spouting spring, fUmarole,fumarolic, and sinter. They can be divided into four areas on the basis of their cropping characteristics. The isotope age of the hydrothermal events determined by the Uranium-series methods is 14. 6 Ma or so. Combined with the stratigraphic correlation, the time of the hydrothermal activity is considered to be Late Miocene-Pleistocene epoch. The major big rift and two groups of the minor rifts approximately pointing to S-N in the area are the main pathway and the main tectonic crack of heat controller for the hydrothermal activity.It is considered preliminarily that the geothermal field should be connected with activities of magma. At present, the geothermal field is in such a steady state that the thermal spreading ratio is equal to the thermal producing ratio, or a little more. Now the temperature of the geothermal field has been verified to be 207℃ at most. |
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| Keywords: | Yang Ying village geothermal field geothermal feature Miocene-Pleistocene |
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