| 早前寒武纪古地热状态的构造环境意义 |
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| 引用本文： | 白瑾.早前寒武纪古地热状态的构造环境意义[J].地学前缘,1999,6(4):323-330. |
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| 作者姓名： | 白瑾 |
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| 作者单位： | 中国地质科学院天津地质矿产研究所,天津,300170 |
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| 摘 要： | 区域变质作用是在造山运动中地热流和动力联合作用的体现。在早前寒武纪的造山带中，随着地壳的缩短，古地热流向构造边界聚敛，形成由高温到低温的区域变质相带序列，它既指示古地热流运移的方向，又是构造边界的指向。古地热流值的高低同构造环境的性质有关，如陆内裂陷带的区域变质仅达绿片岩相，而陆缘活动带的则可高达角闪岩相。古地热流从活动带的边界向中心运移，具有向心性，随着构造层的深埋，构成地热槽，它的片段则表现为地热斜。识别这些古地热状态，可为构造环境属性的鉴定提供有力的依据
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| 关 键 词： | 早前寒武纪 古地热状态 热流运移方向 古地热槽 古地热斜 构造边界指向 |
| 修稿时间： | 1998年12月11日 |
The significance of early Precambrian geothermal state |
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| Bai Jin.The significance of early Precambrian geothermal state[J].Earth Science Frontiers,1999,6(4):323-330. |
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| Authors: | Bai Jin |
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| Abstract: | Regional metamorphism is an expression of geothermal heat flow in cooperation with dynamic process.In the early Precambrian mountain making belt,the paleogeothermal heat flow converged towards the tectonic boundary along with the crust shortening,to give rise to the regional metamorphic facies sequence which indicates the direction of heat flow migration,as well as the tectonic boundary facing.The value of paleogeothermal heat flow was related to the nature of tectonic environment;in a continental rift,the metamorphic grade might extend only to the chlorite schist facies,but in the active continental margin mobile belt,to the amphibolite facies.The paleogeothermal heat flow migrated inwards from the border to the center of a mobile belt to form a paleogeothermal trough along with the tectonic level to be deeply buried,and a segment of the trough to be formed as a paleogeothermocline.These forms of paleo geothermal state can be used as valuable evidences to judge the early Precambrian tectonic settings. |
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| Keywords: | early Precambrian paleogeothermal state direction of paleogeothermal heat flow migration paleogeothermal trough paleogeothermocline tectonic boundary facing |
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