河北省马头营干热岩的成因机制及其示范意义
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本文为中国地质调查项目(编号DD20189114)、国家重点研发项目(编号2019YFB1504102)、中国地质科学院基本科研业务费项目(编号YWF201903- 01、JKY1722)联合资助成果。


Genesis and indicative significance of hot dry rock in Matouying, Hebei Province
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    摘要:

    马头营干热岩的发现说明渤海湾盆地具有较好的干热岩勘查开发潜力。通过对马头营所处区域壳幔结构、深大断裂与新构造活动、岩浆活动、热源与流体源、凹凸相间的构造格局等控热要素的综合分析,初步阐述了深部热物质的上涌过程及地球内外力地质作用对地球浅部地热场的塑造与热异常制约这一关键科学问题。在此基础上,总结了马头营干热岩的成因机制:① 华北克拉通东部破坏,区域岩石圈的明显减薄,有利于热传导与深部热物质上涌,使马头营凸起处于高热流背景区;② 切穿至岩石圈的深大走滑断裂带、地壳内低速高导体及各级壳内断层,构成了深部热物质上涌的流体通道网;③ 凹凸相间的构造格局下,在“热折射”效应、深大断裂带流体热对流、凹陷中心压实热流体向周边凸起流动等因素综合作用下,有利于热流向浅埋的马头营凸起区聚集。马头营干热岩的成因机制对类似地质条件的干热岩勘查具有很好的示范意义,渤海西岸黄骅坳陷、济阳坳陷内的一些凸起,在4 000~6 000m的范围内具有寻找干热岩的良好前景。

    Abstract:

    The discovery of the Matouying hot dry rock indicates that the Bohai Bay basin has great potential for hot dry rock exploration and development. A comprehensive analysis of the thermal control factors such as crust and mantle structure, deep faults, neotectonic and magmatic activities, heat and fluid source, as well as concave- convex tectonic pattern was undertaken. The key scientific issues of the upwelling process of deep thermal fluid, as well as the effect on the shallow- depth geothermal field and the thermal anomaly controlled by tectonism are addressed. Based on this research, the genesis of the Matouying hot dry rock is proposed: ① the destruction of the eastern North China Craton and the obvious thinning of the regional lithosphere are conducive to the heat conduction and the deep thermal materials upwelling, thus explaining the high heat flow in the Matouying uplift; the deep strike- slip fault cut through the lithosphere, low- velocity and high- conductors in the crust; ② faults in the crusts at all levels constitute a fluid channel for deep thermal matter upwelling; ③ the structural pattern of concave and convex phases contributed to the accumulation of heat flow in the shallow Matouying convex area under the comprehensive action by “thermal refraction” effect, fluid thermal convection in deep fault zones and the flow of hot fluid in the center of the depression to the surrounding uplift. The orinin mechanism of the Matouying hot dry rock has indicative significance for the exploration of hot dry rock under similar geological conditions as well as some uplifts in the Huanghua depression and Jiyang depression on the west coast of the Bohai Sea, which has great exploration potential in the depth range of 4000~6000m.

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张保建,李燕燕,高俊,王贵玲,李郡,邢一飞,赵甜.2020.河北省马头营干热岩的成因机制及其示范意义[J].地质学报,94(7):2036-2051.
ZHANG Baojian, LI Yanyan, GAO Jun, WANG Guiling, LI Jun, XING Yifei, ZHAO Tian.2020. Genesis and indicative significance of hot dry rock in Matouying, Hebei Province[J]. Acta Geologica Sinica,94(7):2036-2051.

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  • 收稿日期:2020-04-25
  • 最后修改日期:2020-05-27
  • 录用日期:2020-06-04
  • 在线发布日期: 2020-06-05
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