摘要
以湖北蛇屋山、云南北衙、湖南龙形寨三个红土型金矿为例,本文分析了矿床构造特征和构造在红土型金矿成矿过程中的控制作用。红土型金矿的形成与构造也有密切的关系,区域构造和矿区构造通过控制区域成矿带、原生金矿床(矿体)或高含金地质体的风化母岩的形成、风化母岩的抬升、出露与风化作用、古地理及古构造地貌、古水文地质条件等方面而对红土型金矿的形成产生间接或直接的影响。动力学模拟表明,断裂构造可以显著增高岩石渗透率、促进地下水的流动,从而有利于岩石的化学风化与红土化作用、促进金的溶解、迁移、富集与红土型金矿的形成,并导致断裂部位的风化壳与金矿体厚度显著增大。
Based on the research of three lateritic gold deposits,i.e.Shewushan in Hubei Province,Beiya in Yunnan Province and Longxingzhai in Hunan Province,this paper attemp ts to make it clear that what structural characteristics are for the lateritic gold deposits and how t he structures play an important role in the formation of the gold deposits.R egional structure is close related t o the formation of the gold deposits.The idea can be proved from the follow ing facts.The structures both in regional scale and in mine scale controlled the regional metallogen ic belts,the formation of primary gold deposits(ore-bodies)or Au-rich geological bodies,uplift,exposur e and weathering of bedrocks,paleo-geographic,paleo-tectonic-geomo rphic and paleo-hydrogeologic condition s etc.The dynamic simulation indica tes that faults can greatly increase the permeability of rocks and speed up th e towage of underground water,so that the rocks can be easily weathered or laterized to make gold d issolved,migrated and concentrate d.Finally the lateritic gold deposits were formed,especially in the faulted places where the weathering crusts were quite thick.
出处
《大地构造与成矿学》
EI
CAS
CSCD
北大核心
2002年第3期255-262,共8页
Geotectonica et Metallogenia
基金
国家自然科学基金项目(编号:70171057)
中国科学院知识创新工程重要方向项目(编号:KZCX2-101)资助.
