| 初始地壳的活化再造与金矿床密集区 |
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| 引用本文： | 杨春亮.初始地壳的活化再造与金矿床密集区[J].地质调查与研究,1998,21(2):2. |
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| 作者姓名： | 杨春亮 |
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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： | 前寒武纪古老变质基底是金矿床形成的物质基础，在初始地壳活化再造过程中受到过多次改造和再造，其中，金元素多次受到再分配。高级区花岗岩-绿岩带在活化改造和重熔再造的过程中表现出由麻粒岩相-角闪岩相-绿片岩相转化的退变质过程。这一过程使变质基底岩石中的金有一个预富集。在晚期（主要是燕山期），岩浆-构造活动促使基底岩石中的金再次活化。在成矿围岩退化蚀变过程中，随岩石组分的转化，金得以再次聚集，并形成工业矿床。通过对几个金矿床密集区内的不同岩石类型含金丰度对比，表明地壳活化改造越强，金的矿化程度越高。
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| 关 键 词： | 初始地壳 活化再造 预富集 金矿床密集区 退化蚀变 |
| 修稿时间： | 1998－01－09 |
THE RECONSTRUCTED ORIGINAL CRUST AND THE GOLD-ORE DISTRICTS |
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| Yang chunliang.THE RECONSTRUCTED ORIGINAL CRUST AND THE GOLD-ORE DISTRICTS[J].Geological Survey and Research,1998,21(2):2. |
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| Authors: | Yang chunliang |
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| Abstract: | Gold reserves are very unevenly distributed in China. They are concentratedtnainiy in high - grade greenstone belts of north China Platform and formed rnany gold districts,such as eastern Hebei, Jiaodong, Xiaoqinling, Wulashan, Jiapigou and so on. In those areas, thegold deposits are all occurred in low - grade greenstone belts.After many times tectonic - thermal events displaced, the Archean high grade metmphicbasernents in north China Platform have been deeply rewrked and reformed . They are mainlyshowing retrogration - alteration from granulite faces to amphibelite faces t0 greenschist faces. Inthe meantime, the gold element in the besetment rocks had been reworked tco, and enrichedtogether forming the gold primary enriched sources.In the late time magIna - structure movement (Yenshan Movernnt), the prirnary edrichedgold had been reworked again, followed the elemental transition between the hydrothermal andthe basement rocks reactions, the gold went into the hydrothermal liquid, moving and enrichingtogether, and forming the gold deposits.The wall rocks of the gold deposits are all zoned- From wall rocks to the central auriferousquartz veins, the alterations become stronger and stronger. The gold ore-bodies are alwaysoccurred in the central part of the sones. After comparison from Jinchangyu, Xiaoqinling,Jiapigou, Jiaodong and Wulashan gold districts, we can say that the more retro - alteration, themoe gold content in the high - grade greenstone belts. |
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| Keywords: | original crust reconstruct activation enrichment before the event retro-alteration gold-ore districts |
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