| 江西永平铜矿床蚀变矿化分带、矿石组构及成矿过程 |
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| 引用本文： | 田明君,李永刚,苗来成,张宇,高婷婷,郭敬辉,薛俊召,何斌.江西永平铜矿床蚀变矿化分带、矿石组构及成矿过程[J].岩石学报,2019,35(6):1924-1938. |
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| 作者姓名： | 田明君 李永刚 苗来成 张宇 高婷婷 郭敬辉 薛俊召 何斌 |
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| 作者单位： | 中国科学院地质与地球物理研究所岩石圈演化国家重点实验室, 北京 100029,中国科学院地质与地球物理研究所岩石圈演化国家重点实验室, 北京 100029,中国科学院矿产资源研究重点实验室, 北京 100029,河南省地质调查院, 郑州 450001,中国科学院地质与地球物理研究所岩石圈演化国家重点实验室, 北京 100029,中国科学院地质与地球物理研究所岩石圈演化国家重点实验室, 北京 100029,山东省地震工程研究院, 济南 250014,江西铜业集团有限公司, 南昌 330096 |
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| 基金项目： | 本文受国家自然科学基金重大项目（41890832）资助. |
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| 摘 要： | 江西永平铜矿床位于江山-绍兴断裂带南缘、北武夷山燕山早期岩浆岩与海西期-印支期信江断裂坳陷带接合带,是一个伴生S-W-Pb-Zn多矿种的层状铜矿床。逆冲推覆构造控制着矿区内晚古生代地层、燕山期岩浆岩及矿体的空间分布,即基底周潭群逆冲推覆到晚古生界地层上,燕山早期黑云母花岗岩-花岗闪长岩、石英斑岩、花岗斑岩等沿逆冲推覆断面侵入,矿体呈层状产在矽卡岩化石炭系叶家湾组中。矿体围岩主要是石榴石矽卡岩、千枚状页岩及矽卡岩化大理岩。本文从矽卡岩分带、矿石组构等方面来刻画永平铜矿成矿精细过程。永平铜矿矿区的探采工程揭示,以火烧岗岩体为中心向外,蚀变矿物组合、石榴石颜色及矽卡岩的含矿性等表现出明显的分带规律,即从岩体到围岩有:石榴石→透辉石→硅灰石矽卡岩矿物分带;红色→棕色→绿色的石榴石颜色分带;矽卡岩含矿性先增加后降低,其中矿体主要在(红)棕色石榴石矽卡岩呈条带状或网脉状产出。矽卡岩型和变质砂页岩型矿石的矿石矿物组成均与硫化物-石英大脉(～10m)中矿石矿物组成相同或相似,均为黄铁矿-白钨矿-(方铅矿)-闪锌矿-黄铜矿,且生成顺序一致,说明矿区内不同类型的矿石是同一成矿热液体系在不同围岩类型及控矿构造中的产物。永平铜矿成矿过程可划分为石榴石、(磁)赤铁矿阶段、白钨矿阶段、铁铜硫化物阶段、铅锌硫化物阶段和碳酸盐阶段等六个阶段,其中石榴石阶段形成矽卡岩分带,在该阶段晚期形成磁黄铁矿-铁闪石-(黄铜矿)-石英块状矿石;(磁)赤铁矿阶段发育磁铁矿、赤铁矿;白钨矿阶段形成白钨矿及少量黑钨矿;铁铜硫化物阶段是铜硫矿主要矿化阶段,形成块状及脉状黄铜矿矿石;铅锌硫化物阶段是成矿晚期阶段;碳酸盐阶段代表原生成矿过程结束。
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| 关 键 词： | 矿石组构 矽卡岩分带 成矿过程 永平铜矿 华南 |
| 收稿时间： | 2018/8/10 0:00:00 |
| 修稿时间： | 2019/1/5 0:00:00 |
Alteration and mineralization zoning, ore textures and ore-forming process of Yongping copper deposit, Jiangxi Province |
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| TIAN MingJun,LI YongGang,MIAO LaiCheng,ZHANG Yu,GAO TingTing,GUO JingHui,XUE JunZhao and HE Bin.Alteration and mineralization zoning, ore textures and ore-forming process of Yongping copper deposit, Jiangxi Province[J].Acta Petrologica Sinica,2019,35(6):1924-1938. |
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| Authors: | TIAN MingJun LI YongGang MIAO LaiCheng ZHANG Yu GAO TingTing GUO JingHui XUE JunZhao and HE Bin |
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| Institution: | State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China,State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China,Key Laboratory of Mineral Resources, Chinese Academy of Sciences, Beijing 100029, China,Henan Institute of Geological Survey, Zhengzhou 450001, China,State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China,State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China,Shandong Institute of Earthquake Engineering, Jinan 250014, China and Jiangxi Copper Corporation Limited, Nanchang 330096, China |
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| Abstract: | Yongping copper deposit, associated with S-W-Pb-Zn mineralization, is located at the southern margin of the Jiangshan-Shaoxing suture and between the Yanshanian granite belt and the Hercynian-Indosinian depression in the northern Wuyi Mountains. Late Paleozoic stratigraphy, Yanshanian granite, and copper ore body is controlled by thrust napper structure, as the basement rocks of the Zhoutan Group thrusting on the Late Paleozoic strata, Early Yanshanian biotite granite-granodiorite, quartz porphyry, and granite porphyry intruding along weak planes of thrust, and stratiform ore bodies occurring within the skarnized Carboniferous Yejiawan Formation. The ore body occurred in garnet skarn, phyllitic shale and skarnized marble. This study deciphers the ore-forming episodes and metallogenic process of the deposit based on mineralization-alteration zonation and textures of the ores. Exploration and mining working faces indicate that the mineralization and alteration of the deposit is granite-centered. If taking one side into consideration, i.e., from the granite to the limestone wall rock, following zonation can be delineated:(1) skarn minerals vary from garnet, via diopside, to wollastonite; (2) the garnet varies in color from red, via brown, to green; (3) economic mineralization mainly occurring as banded and stock veins in the brown garnet skarn zone, leading to the ore grade increasing firstly and then decreasing. Metal mineral association of banded and stock veins in skarns, metasandstone-shales, and large sulfide-quartz veins (up to 10m wide) is identical, consisting mainly of pyrite, scheelite, galena, sphalerite and chalcopyrite, indicating that different types of ores in the Yongping copper deposit are products of the same hydrothermal mineralization system in diverse wall rocks and ore-controlling structures. According to mineral assemblages and ore textures, six metallogenic stages can be divided for the deposit, which are garnet, mag-hematite, scheelite, iron-copper sulfide, lead-zinc sulfide, and carbonate stages, respectively. Skarn zonation formed during garnet stage, and massive pyrrhotite-grunerite formed at late period of this stage; magnetite, hematite composed mag-hematite stage; scheelite stage dominate tungsten mineralization, occurring as quartz-scheelite stock and disseminated wolframite. Iron-copper sulfide stage is the main period of copper mineralization; lead-zinc and carbonate stage likely marks the late and end of the primary mineralization, respectively. |
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| Keywords: | Ore texture Skarn zonation Ore-forming process Yongping copper deposit South China |
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