新疆西天山哈勒尕提铁铜矿床同位素地球化学特征及成矿物质来源  

Isotopic Geochemical Characteristics and Sources of Metallogenetic Elements of the Halegati Fe-Cu Deposit in the Western Tianshan Area,Xinjiang,China

作　　者：王新利[1,2] 顾雪祥[1,3] 彭义伟[1] 章永梅[1,3] 章幼惠 高虎[1] 何格[1] 周超[1] 

机构地区：[1]中国地质大学(北京)地球科学与资源学院,北京100083 [2]鑫达金银开发中心,北京100038 [3]中国地质大学(北京)地质过程与矿产资源国家重点实验室,北京100083 [4]中国冶金地质总局中南地质勘查院,武汉430081

出　　处：《矿物岩石地球化学通报》2014年第3期279-288,共10页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：国家科技支撑计划项目(2011BAB06B02-02)

摘　　要：哈勒尕提铁铜矿床是近年来在新疆西天山博罗科努成矿带内发现的一处中型矽卡岩型铁铜矿床,矿体赋存于大瓦布拉克二长花岗岩体与上奥陶统呼独克达坂组大理岩、大理岩化灰岩的接触带。对矿床典型岩(矿)石样品开展了硫、铅、碳、氧同位素研究,结果表明:矿石硫化物δ34 S值变化范围较窄(-1.7‰~4.9‰,均值为1.8‰),具岩浆硫的特征;硫化物的206Pb/204Pb、207Pb/204Pb和208Pb/204Pb变化范围分别为17.951~20.224、15.568~15.692和38.02~40.22,显示出典型俯冲带壳-幔混合铅特征;赋矿围岩大理岩、大理岩化灰岩的δ13 CV-PDB值为-1.9‰^-1.4‰,δ18 OV-SMOW值为10.8‰~17.9‰,显示由海相碳酸盐岩重结晶形成。方解石δ13 CV-PDB值为-2.9‰~0.0‰,δ18 OV-SMOW值为12.0‰~14.7‰,表明方解石中的碳主要来自溶解的海相碳酸盐岩,而氧可能来自成矿流体与灰岩的混合。The Halegati Fe-Cu deposit located in the Boluoke＇ nu metallogenic belt,western Tianshan area,Xinjiang,China,is a newly discovered medium-scale skarn deposit.Its ore bodies occur in the contact between the Dawabulake monzogranite body and marble or marblzed limestone of the Upper Ordovician Hudukedaban Formation.This paper studied sulfur,lead,carbon and oxygen isotopic geochemical characteristics of the Halegati deposit.The δ^34S values of sulfides from the deposit vary from-1.7‰ to 4.9‰,with an average of 1.8‰,indicating that the sulfur was mainly derived from deep magma.The ^206 Pb/^204 Pb,^207 Pb/^204 Pb and ^208 Pb/^204 Pb ratios of sulfides vary from 17.951 to 20.224,15.568 to 15.692,and 38.02 to 40.22,respectively,which are consistent with a mixed ore lead source between crust and mantle in the subduction zone.The δ^13 CV-PDB values vary from-1.9‰ to -1.4‰ and the δ^18OV-SMOW values vary from 10.8‰ to 17.9‰ for marble indicate that it was formed through recrystallization of marine carbonates.The δ13CV-PDB and δ18OV-SMOW values of the calcite vary from 2.9‰ to 0.0‰ and 12.0‰ to 14.7‰,respectively,indicating a marine carbonates source of carbon and a mixed source of oxygen between the ore forming fluid and marine carbonates.

关 键 词：同位素 物质来源 哈勒尕提 博罗科努 西天山 

分 类 号：P618.31[天文地球—矿床学] P618.41[天文地球—地质学] P597