我国南岭地区钨锡铌钽矿床成矿花岗岩主要地质特征  

Geological characteristics of host granite intrusions of the W-Sn-Nb-Ta deposit,Nanling area,China

作　　者：王莉娟[1] 王京彬[1] 王玉往[1] 廖震[1] 陈言飞[2] 

机构地区：[1]有色金属矿产地质调查中心,北京100012 [2]中国地质大学(北京),北京100037

出　　处：《矿产勘查》2013年第6期598-608,共11页Mineral Exploration

基　　金：危机矿山项目(编号:200699105);国家重点基础研究发展规划(编号:2007CB411304);国家自然科学基金(编号:40672061)共同资助

摘　　要：我国南岭地区中生代爆发了大规模的钨锡铌钽成矿作用.其中钨成矿年龄范围相对较短,约145 ～175Ma,高峰期集中在150～160 Ma.锡成矿作用的时间范围宽,约75～225 Ma,燕山中期也是一个锡的成矿高峰期,主要集中在145 ～155 Ma,比同期钨成矿年龄稍晚.富钨、富锡钨、富铌钽3类花岗岩化学成分有相似之处,均主要为壳源,但也存在明显的演化趋势,从富钨→富锡钨→富铌钽花岗岩,它们的岩石组分从高钾钙碱性系列向钾玄岩系列演化,从准铝质向过铝质演化,其REE元素配分模式由规则状的稍左倾的“V”型模式向不规则状的稍右倾的“V”型模式演化,REE元素总量也在逐渐降低.与之相对应的成矿规律为：在空间分布上表现为东钨西锡;成矿时间上表现为锡的成矿年龄逐渐推后;岩浆组分上表现为深源组分增多.The large-scale W-Sn-Nb-Ta mineralization formed in the Nanling area,China in the Mesozoic period.The period of tungsten mineralization relatively is short,ranging from 145 Ma to 175 Ma and the strong tungsten mineralization formed in the period of from 145 Ma to 155 Ma.The extensive tin mineralization formed in the Middle Yanshanian period of from 75 Ma to 225 Ma,mainly ranging from 145 Ma to 155 Ma,which is later than the tungsten mineralization.There is similarity in the chemical composition of three types of granite intrusions,i.e.,of rich-W,rich-Sn and rich-Nb-Ta granites,which are mainly formed from the crust source,however,there is an apparent evolution trend among these three types of granites,i.e.,from rich-W granite to rich-Sn-W granite to rich-Nb-Ta granite,the rock composition evolved into the rich-potassium trachy basalt series from the rich-potassium calc-alkali rock series,and into the peraluminous rock from hypoaluminous rock.The total concentration of REE decreases and the REE V mode also evolved into the un-regular and right-skewed mode from from the regular and left-skewed mode.The geotectonic environment is also evolved into the plate uplift and extensional environment from the plate collision and extensional environment.Thus the ore-forming tempo-spatial rules are formed,i.e.,tungsten mineralization in the eastern part,tin mineralization in the western part; and the formation of tin deposit was in the later stage.And the magmatic composition from the deep source is increased.

关 键 词：钨锡铌钽矿床 花岗岩 地质特征 南岭地区 中国 

分 类 号：P618.67[天文地球—矿床学] P618.44[天文地球—地质学]