武当地区构造类型及其控矿作用  

Structural Types and Ore-controlling Process in Wudang area

作　　者：秦正永[1] 陈林栋 刘兴义 魏兴炎 

机构地区：[1]天津地质矿产研究所,天津300170 [2]天津华北地质勘查总院,天津100180 [3]鄂西北地质调查院,湖北襄樊441900 [4]湖北银矿,湖北竹山442218

出　　处：《地质调查与研究》2005年第1期16-24,共9页Geological Survey and Research

基　　金：国家重点黄金科技攻关项目"鄂西北火山岩金(银)砂成矿成果研究"(90052-03);地矿部定向基金项目"湖北省武当地区构造性质及成矿条件"。

摘　　要：文中主要讨论了武当地区构造类型及控矿作用。构造类型基本包括伸展滑脱构造、推覆构造和脆性构造,分别发生在三个不同的时期。伸展滑脱构造主要存在于前印支期,挤压推覆构造存在于印支期,脆性断裂出现在印支晚期。多重韧性滑脱面出现在武当群地层形成时的不同构造岩性界面上;不同层次顺层伸展滑脱面(DF1DF5)常出现在堆垛的构造岩性面上,并优先富集Au、Ag矿;逆冲推覆构造使先存滑脱面变形,伴随褶皱作用使成矿元素流动、搬运、富集。The geological structural types and ore-cotrolling process in Wudang area is discussed in this article.The structural types are mainly extensional decollement structure, compression-thrust structure and brittle structure. They appeared in three different periods. The extensional decollement structure mostly exists in the period of the pre-Indosinium, the compression-thrust structure in the Indosinium, and brittle fracturing in the late Indosinium. The bedding extensional decollements on different levels(DF1(-DF5))play an important rule in forming stacked structural-lithologic layers and the enrichment of Au-Ag mineralization. The compression-thrust structure made the old decollement planes deform, and the ore-forming elements move and gather into Au, Ag ores with the folding process. So there are a lot of Au, Ag deposits in the different decollement levels.

关 键 词：武当地区 伸展滑脱面 逆冲推覆构造 脆性断裂 控矿作用 

分 类 号：P542[天文地球—构造地质学] P618.5[天文地球—地质学]