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THE RIFT EVOLUTION AND Au ORE-FORMING REGULAR IN EAST PART OF BEISHAN,GANSHU AND XINGJIANG
Author(s): 
Pages: 7-17
Year: Issue:  1
Journal: VOLCANOLOGY & MINERAL RESOURCES

Keyword:  裂谷演化金矿类型控矿因素甘肃新疆;
Abstract: 甘新北山东段中南带为北山古生代裂谷-造山带,呈北东东-东西-北西西向展布,是塔里木地块东北部太古界、元古界基础上开裂,总体呈二堑一垒五大块,经历∈或O-S或D1、D或D-C和P1-P2三次拉开与闭合、由南向北迁移的演化模式.在该裂谷带及其两侧基底岩系中分布着一系列不同类型金矿床(点),可分为马庄山-南金山、金窝子-照壁山、白山南-拾金坡-将军台、老金厂-音凹峡、白墩子-小西弓、三危山-小宛南山等成矿带,根据赋矿岩系分为产于上古生代火山-次火山岩、火山碎屑岩中,产于印支、海西、加里东期花岗岩类岩体中,产于中元古-太古代变质岩系中,产于奥陶纪、志留纪火山碎屑岩中,产于寒武纪、震旦纪含炭泥岩、硅质岩和大理岩中等金矿,以及石英脉型、破碎蚀变岩型、破碎蚀变岩-石英脉型和矽卡岩型.7种赋矿岩系以前3种为主,4类矿石建造以前2类为主.控矿因素:断裂特别是韧性、韧-脆性断裂,地层岩性特别是火山岩-碎屑岩,岩浆岩特别是海西期、加里东期中酸性、中基性岩,成矿时代为海西晚期、印支期、燕山期和喜山期、以印支期为主,与该期构造活动同步或准同步.
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