青海三江北段草陇伟晶岩型锂多金属矿特征及成因分析  

Characteristics and genesis analysis of pegmatite type lithium-polymetallic deposit in the Caolong area of the northern segment of the Sanjiang belt,Qinghai

作　　者：白宗海[1] 林浩[2] 李善平[1] 陈秉芳[1] 白建海[1] 付军[1] 金婷婷[1] BAI Zonghai;LIN Hao;LI Shanping;CHEN Bingfang;BAI Jianhai;FU Jun;JIN Tingting(Qinghai Institute of Geological Survey,Provincial Key Laboratory of Geological Processes and Mineral Resources of Northern Qinghai-Tibetan Plateau,Xining 810012,China;Qinghai University,Xining 810016,China)

机构地区：[1]青海省地质调查院青海省青藏高原北部地质过程与矿产资源重点实验室,青海西宁810012 [2]青海大学,青海西宁810016

出　　处：《青海大学学报（自然科学版）》2018年第4期86-93,共8页Journal of Qinghai University(Natural Science)

基　　金：青海省科学技术厅计划项目(2014-Z-Y06;2016-SF-A3;2016-ZJ-716;2016-ZJ-719)

摘　　要：为了研究草陇地区伟晶岩型锂多金属矿的特征及成因,对草陇地区地质背景、伟晶岩特征、矿体特征以及成矿阶段进行综合分析,分析发现草陇地区大地构造隶属歇武—甘孜—理塘构造带,在草陇地区发现有伟晶岩型锂多金属矿,具有锂辉石伟晶岩,且品位较高;伴生铍、铌、钽、铯、铷等元素并达到综合性矿石。岩浆演化具有结晶分异、气成热液交代、热液-流体交代的特征,锂、铌钽矿主要形成于热液—流体交代阶段,含锂矿物主要为锂辉石、锂云母,含铌钽矿物为铌钽铁矿。草陇地区伟晶岩可能形成于燕山早中期;含矿伟晶岩是花岗岩浆演化到后期的、富挥发分的残余熔体的产物,具有岩浆分异成因的特征。In order to study the characteristics and genesis of pegmatite type lithium-polymetallic deposits in the Caolong area,the geological background,pegmatite characteristics,ore body characteristics and metallogenic stage are analyzed comprehensively. We find the geotectonic structure of the Caolong area belongs to the Xiewu-Ganzi-Litang tectonic belt. The pegmatite type lithium-polymetallic deposit was found in the Caolong area,which has the characteristics of spodumene pegmatite and high grade. The pegmatite and the associated beryllium,niobium,tantalum,cesium,rubidium and other elements resulted comprehensive ore. The magma evolution in Caolong area has the characteristics of crystallization differentiation,gas-forming hydrothermal metasomatism and hydrothermal-fluid metasomatism. The lithium and tantalum ore mainly formed in the hydrothermal-fluid metasomatism stage,and the lithium minerals were mainly spodumene and lithionite,and the niobium-tantalum minerals were colum-tanta. From the above,we think that the Caolong area pegmatite may be formed in the early middle of Yanshan period; the ore-bearing pegmatite was the product of the residual melt of the granite magma evolution to the later stage,and has the characteristics of magmatic differentiation.

关 键 词：草陇地区 歇武—甘孜—理塘构造带 伟晶岩型 锂多金属矿 成因 

分 类 号：P618.2[天文地球—矿床学]