武当地区构造类型及其控矿作用

Structural Types and Ore-controlling Process in Wudang area

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.