湖北银洞沟银金矿构造特征及构造控矿作用

STRUCTURAL FEATURES AND STRUCTURAI CONTROL OF GOLD AND SILVER ORE DEPOSITS IN YINDONGGOU,HUBEI PROVINCE

武当地区位于华北板块与扬子板块的接合部位，属秦岭造山带。武当群组成一系列大型韧一脆性剪切带巨型推覆体，银洞沟推覆岩席是其中之一。该区早期构造样式为伸展作用及其伴生的韧性或韧脆性面型剪切，晚期为推覆线性剪切。根据面理、线理、褶皱、剪切带等研究成果，作者总结了银洞沟地区构造性质、成矿作用及模式。武当地区多重滑脱是在古地壳演化的不同阶段发育的不同层次的顺层剪切带，发育于变火山岩与变沉积岩之间的滑脱面（DF_2）控制了银、金矿床的形成。

Wudan area is located in the collision belt between the North China and bouth China platforms and belongs to Qinling orogen. Wudang Group is a huge nappe with som large scale of brittle-ductile shear sones, Wudaap nappe is divided into 5 thrust sheets (Fig. 1 ).Yindonggou thrust sheet is one of 5 thrust sheets. It's early tectonic style is mainly extensional process develoPing ductile and ductile-brittle banded shear zone. The latter thrusting is brittle showing linear shear zones. The multiple ductile decollemnt in Wudang area is rePresented by ductile shear zones developed at different level and different stages of evoution of the crust. The Ag and An Ore dpeits are controlled by decollernnts between metasediments and meta-volcanic rocks (DF).According to research results on the cleavages, lineations, folds and shear zones etc., the authors sununarized the structural features, metallogeny and tectonical evolution in Yingdonggu reglon