Exploration of the genesis of regional geothermal resources in Guizhou Province
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摘要: 关于贵州地热成因,人们多倾向于地震活动和断裂控制“地温梯度“机械能升温,不具备岩浆热源及放射性产热条件。本文通过研究前人成果和热储、盖层特征及区域重磁等资料,推测深部断裂和中酸性、基性—超基性岩体,分析天然地热及地热井的区域分布特性,并结合有关的地质资料,提出贵州地热可能存在2种基本成因模式:一是深部断裂控制的“地温梯度“自动增温循环生热,该导热方式驱使地下水持续升温最为发育,二是岩浆岩余热作用,此导热方式的推测作为一种新的产热类型及成因来源补充,而贵州作为我国重要的铀、钍等资源区域成矿地区,目前研究程度低、资料少、规模小,是否存在放射性生热基础尚不清楚。对地热成因深入研究,可为下步区内精准地热调查和找矿方向拓展提供相关依据。Abstract: Regarding the genesis of the geothermal resources in Guizhou Province, most researchers tend to think that the geothermal resources were formed from the temperature rise induced by the mechanical energy of the “geothermal gradient“ controlled by seismic activities and faults and that the geothermal resources do not possess from magma heat sources nor have the conditions of radioactive heat generation. Based on the research on the previous achievements, the characteristics of geothermal reservoirs and cap rocks, and regional gravity and magnetic data, the inference of the deep faults and intermediate-acid and basic-ultrabasic rock masses, and the analysis of regional distribution characteristics of natural geothermal resources and geothermal wells, this study proposes two possible basic genetic models of the geothermal resources in Guizhou. One is that automatic temperature rise and cyclic heat generation caused by the “geothermal gradient“ controlled by deep faults. The groundwater with continuous temperature rise driven by this model is the most developed. The other genesis is the waste heat of magmatic rocks. It is inferred as a new type of heat generation and genesis supplement. As an important regional metallogenic region of uranium and thorium in China, Guizhou Province has only been researched at a low level and on a small scale, with a small amount of available data. Therefore, it is not clear whether there are basic conditions of radioactive heat generation in Guizhou Province. The in-depth study on the genesis of geothermal resources can provide relevant bases for the accurate surveys of geothermal resources and the expansion of prospecting direction in Guizhou Province in the future.
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Key words:
- geothermal resources /
- cap rock /
- deep fault /
- active fault /
- genesis /
- Guizhou
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