全椒县范水洼金矿区控矿构造初步研究

研究区主要构造活动可分为3期：早期，发育以透入性的剪切劈理为特征的复式褶皱及倒转翼的逆冲剪切减薄拉断作用；中期，伸展作用；后期，脆性的挤压剪切破碎作用。通过详细地质构造剖面测制。建立了区内的主要构造格架：总体为一复式向斜一汪洼向斜，以杨柳岗组中上段为两翼，以琅琊山组为核，二级褶皱总体表现为向斜开阔，背斜紧闭，向南东倒伏的特征；二级褶皱的转折端为主要的控矿容矿构造，矿(化)体主要赋存于复式向斜的核部、背斜转折端。二级褶皱背斜转折端的拉张垮塌破碎角砾岩及翼部特别是近倒转翼的剪切破碎带是最重要的控矿容矿构造。

A PRELIMINARY STUDY ON THE ORE- CONTROL STRUCTURE OF GOLD DEPOSITS IN FANSHUIWA, QUANJIAO COUNTY

There were three main stages of tectonic deformation in the area studied.The early one was shearing fold characterized by developed penetrative shear cleavage and thinning and faulting during the thrusting shear on the overturned limb;the secondary was extension;and the later one was fragmentation by compressing and shearing A major tectonic framework is set up on the basis of detailed mapping. It was generally a synclinorium named the Wangwa Synclinorium whose core was the Langyashan Formation and limbs were middle and upper members of Yangliugang Formation The secondary fold appears as open syncline followed by tight anticline,axis plane tilting to the southeast. The crest parts of the secondary anticlines were the main parts of the ore-controlling and holding structure,especially the collapsed broken breccia by extension at the top of the anticlines and shearing fragmentation zone at the limbs or near the overturned limbs