小秦岭金成矿区南矿带构造控矿规律和矿床定位样式  

Structural Controls on Mineralization and Distribution of Orebodies in the Southern Ore Belt of the Xiaoqinling District

作　　者：王晋定 王大钊[2] 詹小飞 魏俊浩[1] 肖鸿[3] 李欢[1] 黄啸坤 WANG Jinding;WANG Dazhao;ZHAN Xiaofei;WEI Junhao;XIAO Hong;LI Huan;HUANG Xiaokun(Faculty of Earth Resource,China University of Geosciences(Wuhan),Wuhan 430074,Hubei,China;School of Earth Sciences and Resources,China University of Geosciences(Beijing),Beijing 100083,China;No.1 Geology Party,Bureau of Geology and Mineral Resources Exploration and Development of Xinjing,Changji 831100,Xinjiang,China)

机构地区：[1]中国地质大学(武汉)资源学院,湖北武汉430074 [2]中国地质大学(北京)地球科学与资源学院,北京100083 [3]新疆地质矿产勘查开发局第一地质大队,新疆昌吉831100

出　　处：《大地构造与成矿学》2018年第6期1064-1077,共14页Geotectonica et Metallogenia

摘　　要：小秦岭金成矿区是我国第二大金矿床集中区,南矿带是该区大中型金矿最集中的矿带,矿带内金矿的形成、演化与分布严格受构造,尤其是断裂构造的控制。通过对桐峪金矿床、东闯金矿床、文峪金矿床、杨砦峪金矿床等典型矿床的研究,建立了小秦岭地区构造演化体系,系统划分了南矿带中生代断裂构造演化期次,并对金成矿期构造应力场进行了详细分析。以构造演化及应力场分布为基础,分别从矿床尺度和矿体尺度对构造控矿规律进行了总结。结合对构造控矿规律的分析,认为金成矿期的断裂在无大规模成矿活动或无二次叠加成矿作用的情况下,以第二矿化富集中心为目标进行深部找矿获得重大突破的难度较大,但主断裂下盘仍然存在有利的找矿空间。The Xiaoqinling district is the second largest gold deposit concentration area in China, within which most of the medium to large sized gold deposits occur in the southern ore belt. Ore mineralization and distribution of the gold deposits in the southern ore belt are strictly controlled by faults. Four typical gold deposits, including Dongtongyu gold deposit, Dongchuang gold deposit, Wenyu gold deposit, and Yangzhaiyu gold deposit were investigated. The tectonic evolution of the Xiaoqinling district is constructed based on features of the typical deposits. The tectonic system is divided into 4 epochs, i.e., the ductile shearing, mafic dike filling, gold mineralization and post-mineralization epochs. A detailed analysis of the stress field of the gold mineralization epoch showed that the ductile-brittle faults are the dominant factor controlling the occurrence of the deposits and ore-bodies, which suggests that the very same stress field controlled both of the mineralization and tectonic activity in the southern ore belt. We, therefore, suggest that footwalls of the main faults are promising loci for ore expecting.

关 键 词：构造控矿 小秦岭 南矿带 应力分析 

分 类 号：P613[天文地球—矿床学]