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J4 ›› 2016, Vol. 22 ›› Issue (1): 1-.DOI: 10.16108/j.issn1006-7493.

• 矿床地质学 •    下一篇

浙江建德铜矿流体包裹体研究

陈辉,倪培*,陈仁义,叶天竺,王国光,张伯声,徐颖峰   

  • 出版日期:2016-03-20 发布日期:2016-04-14

Fluid Inclusion Studies of the Jiande Copper Deposit,Zhejiang Province,China

CHEN Hui, NI Pei*, CHEN Renyi, YE Tianzhu, WANG Guoguang, ZHANG Baisheng,XU Yingfeng   

  • Online:2016-03-20 Published:2016-04-14

摘要:

浙江建德铜矿(原名岭后铜矿) 是20世纪60年代初期探明的中型铜矿,位于扬子板块和华夏板块结合带(即钦杭结
合带) 北东段。文中系统研究了建德铜矿主成矿期块状矿石石英中的流体包裹体。岩相学研究表明主要发育三类包裹体:
包括富液相包裹体(I型),富气相包裹体(II型),以及含子晶包裹体(III型);显微测温结果显示:I类富液相包裹体加热
后均一到液相,均一温度分布范围主要集中在280~340℃,流体包裹体盐度0.63~8.00 wt.% NaCl eqv,II类富气相包裹体加
热均一到气相,均一温度296~334℃,盐度1.22~2.00 wt.% NaCl eqv的低盐度范围,III类含子晶包裹体,均一温度范围与II
类包裹体基本相同,介于290~326℃,盐度则较高,介于31.87~38.16 wt.% NaCl eqv。激光拉曼探针分析揭示,流体挥发分
主要为水蒸气,同时部分包裹体气相组分中含有CO2、CH4、N2。II类与III类流体包裹体在视域内共存,且两者均一温度相
似,盐度相差很大,表明强烈的流体沸腾作用发生。流体强烈沸腾作用是造成建德铜矿成矿物质沉淀富集的原因。成矿流
体研究结合地质特征表明,建德铜矿是燕山期的矽卡岩型矿床而不是海西期的喷流沉积矿床。

关键词: 流体包裹体;显微测温;激光拉曼光谱;建德铜矿;浙江省

Abstract:

Jiande copper deposit in Zhejiang Province was found in the 1960, and it is located in the northeastern part of
Qinzhou-Hangzhou suture belt between Yangtze and Cathaysia blocks. Research about ore-forming fluids on it is still lacking. This
study made a systematic investigation of fluid inclusions in the Jiande copper deposit. Based on petrographic observations of
ore-bearing quartz collected from the massive ores, there are three types of primary inclusions of Jiande deposit: two-phase liquid-rich
(type I), two-phase vapor-rich (type II), and halite-bearing (type III) fluid inclusions. Type I inclusions occur widely in the Jiande

deposit and show homogenization temperatures of 220~377℃ and salinities of 0.63~8.00 wt.%NaCl equivalent. Type II and type III
inclusions primarily coexist in ore veins. Homogenization temperatures of type II and type III reveal peak temperatures at 296~334℃
and 290~326℃ , respectively, and their salinities at 1.22~2.00 wt.% NaCl and 31.87~38.16 wt.% NaCl, respectively. The results
indicate that fluid boiling process took place, and metal precipitation was probably induced by extensive fluid boiling events during the
ore stage. Raman analysis of fluid inclusions indicates that, in the gaseous phase, water is dominant with small amount of CO2, CH4, and
N2. Our study suggests that the Jiangde copper deposit is a Yanshanian Skarn deposit rather than a Hycernian Sedex Cu deposit.

Key words: fluid inclusion, microthermometry, raman spectroscopy, jiande copper deposit, Zhejiang Province