新疆乌拉根铅锌矿赋矿岩层特征与成矿环境分析  

Analysis on Characteristics of Ore-bearing Strata and Mineralization Environment of Wulagen Pb-Zn deposit in Wulagen County of Xinjiang Province

作　　者：莫新华[1] 

机构地区：[1]紫金矿业集团股份有限公司西北矿产地质勘查院,新疆乌鲁木齐830000

出　　处：《山东国土资源》2016年第4期22-26,共5页Shandong Land and Resources

摘　　要：乌拉根铅锌矿大地构造位于塔里木地台塔里木台坳西南坳陷的喀什凹陷内的乌拉根向斜东段,铅锌矿化体产于向斜南北翼及核部并受控于古近系古新统乌拉根组第一岩性段第二层中。矿化层主要为砂砾岩、含砾砂岩、砂岩及薄层泥岩,由25个粒序5个韵律层组成。各韵律层在向斜南北翼具可对比性但略有差异,铅锌矿体主要产于砂砾岩交互产出的韵律层中,反映矿体形成于相对高能动荡环境。含矿岩层岩石地球化学特征显示碎屑物源为长英质火成岩及石英岩沉积物,形成于大洋衰减-闭合期板块活动大陆边缘及大陆岛弧环境,因此推断矿床形成于浅海三角洲-滨海相。Wulagen Pb-Zn tectonic structures locate in east part of Wulagen syncline in kashi depression of southwest depression of Tarim platform depression. Zinc and lead ore bodies developed in south and north south edges and its core parts of the syncline,and controlled by secondary section of the first rock property in Palaeogne Wulagen formation. Strata were composed of sandy conglomerate,sandstone,and mudstone,which were made up of 25 grain sequences and 5 rhythmic layers. Each rhythmic layer has comparability between north and south edges,but is different slightly. Zinc and lead ore bodies were mainly developed in rhythmic layers formed by sand and conglomerate. It indicated an unstable environment. As showed by geochemical characteristics of ore-bearing strata,clastic sources were felsic igneous rock and quartzite,which were formed in the active continental margin and island arc. Therefore,it is concluded that mineralization occurred in the environment of shallow sea delta to littoral facies.

关 键 词：沉积韵律 铅锌矿化 浅海三角洲-滨海相 新疆乌拉根 

分 类 号：P618.4[天文地球—矿床学]