休宁桃溪断裂破碎带构造解析及其区域控矿作用启示

位于休宁县-歙县整装勘查区北西缘的休宁桃溪构造破碎带,岩石破碎,矿化蚀变强烈。详细的构造研究从中解析出逆冲推覆、左行平移作用、正断层作用和右行平移作用等多起变形。带中花岗斑岩侵入及金多金属矿矿化与构造的关系研究表明,逆冲推覆构造为成矿前构造,北东向平移断层控制了区内岩浆岩的分布,以北东向为主的正断层是成矿期构造,而右行平移断层是成矿后构造。本构造破碎带的多期变形及其与成矿关系可以为休宁县-歙县整装勘查区的构造控矿作用提供勘查。

StruCturAl interPretAtion of the tAoxi frACture zone in xiuninG And the imPliCAtionS of itS role in reGionAl ore Control

At the northwestern fringe of the Xiuning County-Shexian County overall-planned and mining-oriented exploration area, the Taoxi structural fracture zone is broken in rocks and strong in mineralizing alteration. Detailed structural study led to identification of thrusting, left-lateral displacement, normal faulting and right-lateral displacement. Granite porphyry intrusion into the zone and relation between gold polymetallic mineralization and structure indicated that thrust-nappe structure was prior to mineralization in time, NE-trending strike-slip fault controlled distribution of magmatic rocks in the area, the dominantly NE-trending normal fault took place in the mineralizing period and right-lateral strike-slip fault formed after mineralization. The multi-stage deformation of the fracture zone and its relation with ore formation may guide exploration in the study area.