| 甘肃桦树沟铜矿床成矿年龄讨论 |
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| 引用本文：.2003.Discussion on Metallogenic Age of Huashugou Copper Deposit in Gansu[J].Mineral Deposits,22(2):134~140 |
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| 基金项目:北祁连山西段铜矿床成矿模式及找矿预测研究课题(编号：95-02-004-02) |
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| 中文摘要:桦树沟铜矿床是近年来在北祁连山西段镜铁山矿田发现的一种新类型铜矿床。作者在矿床区域地质背景、地质特征分析的基础上，通过对与成矿密切相关的石英闪长岩脉中的锆石U-Pb同位素年龄及蚀变岩型铜矿石的40Ar-39Ar同位素年龄测定，认为桦树沟铜矿床是在元古宙铜预富集的基础上，富含铜元素的条带状铁建造经加里东造山期的挤压、破碎，隐伏花岗岩基和石英闪长岩脉侵入及与衍生成矿流体的水岩反应等作用，使其中的铜元素活化析出并被带到就近的有利构造空间沉淀成矿，其成矿年龄限定于(364.7±8.4) Ma～(476±15) Ma之间。 |
| 中文关键词:地球化学 铜矿床 成矿年龄 甘肃 桦树沟 |
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| Discussion on Metallogenic Age of Huashugou Copper Deposit in Gansu |
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| Abstract:The Huashugou copper deposit is a new type copper deposit discovered recently in the Jingtieshan ore district. The copper deposit is situated in the banded iron formation of the Jingtieshan Group on the northern side of the Jingtieshan iron ore field. Its orebody is controlled strictly by the fracture-altered zone within the ore district. The deposit has both the marks of the sedimentation and the features of the later hydrothermal process. Based on an analysis of the regional background and the geological features of the deposit, the authors determined the zircon U-Pb age of the quartz diorite veins associated with the copper mineralization and the 40Ar-39Ar age of the altered sericitolite in the alterad rock-type copper ore. It is thought that the Huashugou copper deposit was formed through two processes: the enrichment of Cu in banded iron formation was completed in Proterozoic, and then Cu in the banded iron formation was mobilized by fracturing, intrusion and hydrothermal fluid and finally precipitated in fractures in Caledonian. The metallogenic age should be within the period of (364.7±8.4) Ma to (476±15) Ma. |
| keywords:geochemistry, western part of Northern Qilian, alterad rock type copper ore, metallogenic age, Gansu, Huashugou |
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