| 粤西深层次推覆构造带的成岩成矿规律 |
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| 引用本文： | 张伯友,俞鸿年,郭令智,董平.粤西深层次推覆构造带的成岩成矿规律[J].地质找矿论丛,1993,8(3):1-13. |
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| 作者姓名： | 张伯友 俞鸿年 郭令智 董平 |
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| 作者单位： | 中国科学院地球化学研究所广州分部 510640
(张伯友)，南京大学地球科学系 210008
(俞鸿年，郭令智)，南京大学地球科学系 210008(董平) |
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| 基金项目： | 国家自然科学基金(项目编号:49272133) |
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| 摘 要： |
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| 关 键 词： | 推覆构造 金矿床 糜棱岩型 成矿 |
PETROGENESIS AND METALLOGENESIS IN THE DEEP-LEVEL NAPPE STRUCTURAL ZONE IN WESTERN GUANGDONG |
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| Zhang Boyou,Yu Hongnian,Guo Lingzhi and Dong Ping.PETROGENESIS AND METALLOGENESIS IN THE DEEP-LEVEL NAPPE STRUCTURAL ZONE IN WESTERN GUANGDONG[J].Contributions to Geology and Mineral Resources Research,1993,8(3):1-13. |
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| Authors: | Zhang Boyou Yu Hongnian Guo Lingzhi and Dong Ping |
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| Institution: | Institute of Geochemistry, Academia Sinica, Guangzhou 510640;Department of Earth Sciences, Nanjing University, 210008;Department of Earth Sciences, Nanjing University, 210008;Department of Earth Sciences, Nanjing University, 210008 |
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| Abstract: | There are many Sinian-Cambrian (Zc-∈b) epimetamorphic blocks either in groups or scatteredly covering the granitoids in the area of Guangning-Zhaoqing, the northwestern part of wuchuan-Sihui faults in western Guangdong. Through the field work and lab studies on the deep-level nappe structural zone, it has been shown that the blocks are allochthonous, i.e. klippe of thrust, and the granitoids are of a part of the slip system which consists vertically of upper mylonite and migmatite-granite-lower migmatite and mylonite from top to bottom in the deep-lower migmatite and mylonite in the deep-level nappe structural zone. The authors believe that the slip system zoned vertically was generated by dynamometamorphism and partial melting within the zone. The genetic relationships of mylonite, migmatite and granite are also discussed by the stuides of deformation structure, frictional heating (shear strain heating) and melt-enhanced deformation, etc.. The authors emphasize that, during the evolution of the thrust from earlier to later geological periods, mylonites were generated in the first time. Migmatites were reformed from mylonites. Granites were the last production of the migmatization. This process (mylonitization, migmatization and granitization) leads to mobilization and migration of gold. the gold-bearing metamorphic fluid migrates from migmatite zone and granite zone to upper mylonite zone and lower mylonite zone in the slip system. The allochthonous upperly and the autochthonous lowerly rule as geochemistry obstructs in the process of migration of the fluid. Au and Fes2 were assembled and deposited in the double-paired mylonite zones when geochemistry equilibrium of the fluid was broken. There may be a super large gold deposit lain concealed in the lower mylonite zone undenuded. |
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