湘西北铅锌矿床的地质特征及找矿标志  

Geological characteristics and ore indicators of lead-zinc deposits in northwestern Hunan,China

作　　者：杨绍祥 劳可通 

机构地区：[1]湖南省地质调查院吉首矿产地质调查所,湖南吉首416007

出　　处：《地质通报》2007年第7期899-908,共10页Geological Bulletin of China

基　　金：中国地质调查局地质调查项目(编号:200110200022)资助

摘　　要：湘西北铅锌矿床是中国著名的层控型金属矿床,其地质特征和规模类似于美国的密西西比铅锌矿床。湘西北地跨上扬子地块和江南地块(北西缘)2个二级大地构造单元。按矿床所处的不同大地构造位置及其地质-地球化学特征,将湘西北铅锌矿床划分为洛塔、花垣、保靖铅锌矿田和凤凰铅锌汞矿田。其中控矿层位有3个:下寒武统清虚洞组下段藻灰岩、中寒武统敖溪组上段粉晶云岩和下奥陶统南津关组生物碎屑灰岩。较全面地论述了湘西北铅锌矿床的地质特征,并对找矿标志进行了探讨。Lead-zinc deposits in northwestern Hunan are famous stratabound metal deposits in China and their geological characteristics and sizes are similar to Mississippi Valley lead-zinc deposits in the United States. Northwestern Hunan is located in two second-order tectonic units-the Upper Yangtze block and Jiangnan block （northwestern margin）. According to the tectonic setting and geological-geochemical characteristics, the lead-zinc deposits in northwestern Hunan may be classified into the Luota, Huayuan and Baojing lead-zinc field and Fenghuang lead-zinc-mercury field. In these ore fields there are three ore-controlling horizons： algal limestone in the Lower Member of the Lower Cambrian Qingxudong Formation, dolomicrite in the Upper Member of the Middle Cambrian Aoxi Formation and bioclastic limestone of the Lower Ordovician Nanjinguan Formation. The paper completely deals with the geological characteristics of lead-zinc deposits in northwestern Hunan and discusses their ore indicators.

关 键 词：铅锌矿 地质特征 找矿标志 湘西北 

分 类 号：P618.42[天文地球—矿床学] P618.43[天文地球—地质学]