《黄金》杂志(月刊) 第38卷 总第396期
2017年02月 第02期
目次
黄金地质
  • 西秦岭阳山金矿床地球化学特征及成因探讨……魏居珍,刘云华,王海林,王志军,滕 飞,韩一筱,田润青
  • 摘 要:阳山金矿床位于甘肃省文县境内,是西秦岭地区代表性的金矿床之一,其矿床成因和类型一直存在诸多争议。对阳山金矿床矿体产出特征、矿区构造、控矿构造与控岩构造的关系及矿床HOS同位素进行了研究。研究发现,矿体产于花岗斑岩上下盘及其富集的断层破碎带中,二者在空间上关系密切,均受背斜转折端虚脱构造和褶皱翼部层间断层的控制,受控于同一构造系统;主成矿期石英成矿主阶段流体δ18OV-SMOW变化范围为8.75‰10.12‰δ18DV-SMOW变化范围为-82.4‰-74.1‰,显示成矿流体主要来源于岩浆热液;毒砂、辉锑矿δ34S变化范围为-6.3‰0.9‰,显示深源硫的特征;花岗斑岩中锆石LA-ICP-MSU-Pb测年年龄为214.8Ma±6.4 Ma。综合研究认为,阳山金矿床为印支末期与岩浆作用有关的中低温岩浆热液型矿床。
  • 关键词:阳山金矿床;稳定同位素;成岩年龄;矿床成因;矿床类型;中低温岩浆热液型矿床

    Discussion about genesis and geochemical characteristics of Yangshan Gold Deposit in west Qinling……Wei Juzhen,Liu Yunhua,Wang Hailin,Wang Zhijun,Teng Fei,Han Yixiao,Tian Runqing

    AbstractYangshan Gold Deposit,located in Wenxian County of Gansu Province,is one of the most typical gold deposits in west Qinling.However,the genesis and classification of the ore deposit have been controversial.This paper mainly discusses the relation between the characteristics of the orebody,the structure of the deposit,the ore-controlling structure and the rock-controlling structure,and studies the H,O and S isotopes in the deposit.The conclusion is that the orebody occurs in both the hanging wall and footwall of granite porphyry and its fault fracture zone.The two are closely related in space,both controlled by the fault zone located between the collapsing part of the turning point of the anticline and the wings of the fold.The δ18OV-SMOW valueof fluid in the quartz associated with mineralization ranges from 8.75 ‰ to10.12 ‰ while δ18DV-SMOW from-82.4 ‰ to -74.1 ‰,indicating a magmatic origin.The δ34S value ofthe arsenopyrite and stibnite is from -6.3 ‰ to 0.9 ‰,indicating the origin of a deep source.The exact age of the granite porphyry obtained by single grain zircon using LA-ICP-MS is 214.8 Ma±6.4 Ma.Overall,it is concluded that Yangshan Gold Deposit belongs to a medium low-temperature hydrothermal ore deposit associated with magmatic activities in Indosinian period.

    Keywords:Yangshan Gold Deposit; stable isotope ; diagenetic age; genesis ofdeposit; type of deposit; medium low-temperature hydrothermal ore deposit
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