[1]周曙光,蔡杨,杜建国,等.铜陵天马山硫金矿床矽卡岩矿物学特征及矿石硫同位素地球化学研究[J].华东地质,2023,44(01):51-66.[doi:10.16788/j.hddz.32-1865/P.2023.01.005]
　ZHOU Shuguang,CAI Yang,DU Jianguo,et al.Skarn mineralogical characteristics and ore sulfur isotope geochemistry of Tianmashan sulfur-gold deposit, Tongling area[J].East China Geology,2023,44(01):51-66.[doi:10.16788/j.hddz.32-1865/P.2023.01.005]
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铜陵天马山硫金矿床矽卡岩矿物学特征及矿石硫同位素地球化学研究()
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《华东地质》[ISSN:2096-1871/CN:32-1865/P]

卷:
44
期数:
2023年01期
页码:
51-66
栏目:
重要矿产资源专辑
出版日期:
2023-04-15

文章信息/Info

Title:
Skarn mineralogical characteristics and ore sulfur isotope geochemistry of Tianmashan sulfur-gold deposit, Tongling area
作者:
周曙光1; 3;  蔡杨2; 3;  杜建国2; 3;  吴硕1; 3;  施珂2; 3;  李孜腾2; 3
1. 铜陵有色金属集团股份有限公司矿产资源中心, 安徽铜陵 244000;
2. 安徽省地质调查院(安徽省地质科学研究所), 安徽合肥 230001;
3. 安徽省深部资源勘查工程研究中心, 安徽合肥 230001
Author(s):
ZHOU Shuguang1; 3;  CAI Yang2; 3;  DU Jianguo2; 3;  WU Shuo1; 3;  SHI Ke2; 3;  LI Ziteng2; 3
1. Mineral Resource Center, Tongling Nonferrous Metals Group Holdings Co., Ltd, Tongling 244000, Anhui, China;
2. Geological Survey of Anhui Province(Anhui Institute of Geological Sciences), Hefei 230001, Anhui, China;
3. Engineering Research Center of Deep Resource Exploration of Anhui Province, Hefei 230001, Anhui, China
关键词:
安徽铜陵矿集区; 天马山硫金矿; 矽卡岩矿物; 硫同位素; 成矿条件
Keywords:
Tongling ore concentration area;  Anhui; Tianmashan sulfur-gold deposit; skarn minerals; sulfur isotope; ore-forming condition
分类号:
P575.1P618.51
DOI:
10.16788/j.hddz.32-1865/P.2023.01.005
摘要:
天马山硫金矿是铜陵矿集区典型的层控热液叠加改造型矿床,层状矿体中发育大量的矽卡岩矿物。为查明该矿床中矽卡岩矿物的类型及形成环境,探讨矽卡岩与硫、金成矿之间的关系,对主要的矽卡岩矿物开展了矿物学及矿物化学研究,并对矿石进行了硫同位素地球化学研究。研究表明:矿区内的矽卡岩矿物以石榴子石和辉石为主,其中石榴子石以钙铁榴石为主,属于钙铁榴石-钙铝榴石固熔体系列(Gro0~18.73And80.54~99.00Spe+Pyr+Alm0.54~1.47);辉石以透辉石为主,其次为钙铁辉石,属于透辉石-钙铁辉石系列(Di62.35~97.65Hd1.89~36.27Jo0.31~1.55)。天马山硫金矿的矿物组合(钙铁辉石+透辉石)属于氧化型矽卡岩,表明矽卡岩形成于相对高温和高氧逸度的条件。石榴子石和辉石端元组分特征及辉石Mn/Fe值(0.02~0.07)具有典型的矽卡岩型铜、金矿床特征。矿石硫同位素具有岩浆源的特征,与区内燕山期岩浆-成矿作用形成的矿石一致,而明显区别于喷流-沉积作用形成的矿石,显示成矿作用与燕山期岩浆活动具有密切的成因联系。燕山期中酸性岩浆交代碳酸盐岩围岩形成大量矽卡岩,矽卡岩矿物的形成增加了岩石的孔隙度和渗透率,为晚期硫、金矿床的形成提供了有利条件。
Abstract:
The Tianmashan sulfur-gold deposit is a typical stratabound hydrothermal superimposed reformed deposit in the Tongling ore concentration area and hosts abundant skarn minerals in major bedded ore body. In order to ascertain the skarn minerals types and ore-forming setting of Tianmashan deposit and explore the relationship between skarnization and mineralization, the mineralogy and mineral chemistry of main skarn minerals, and the geochemistry of its sulfur isotope were studied. The research shows that the skarn minerals in Tianmashan deposit are mainly comprised of garnet and pyroxene. Most of garnet are andradites, belonging to andradite-grossular series (Gro0~18.73And80.54~99.00Spe+Pyr+Alm0.54~1.47). Pyroxene is dominated by diopside, followed by hedenbergite, thus can be listed into diopside-hedenbergite series (Di62.35~97.65Hd1.89~36.27Jo0.31~1.55). The mineral assemblage(andradite and diopside)in Tianmashan sulfur-gold deposit is attributed as oxidized skarn, indicating the skarn diagenetic conditions of relatively high temperature and high oxygen fugacity. The characteristics of the end-member components in garnet and pyroxene, and the lower pyroxene Mn/Fe ratio (0.02~0.07) were similar to those in the typical skarn copper and gold deposits. The sulfur isotopes of ore with magmatic hearth features were consistent with Yanshanian magmatic-metallogenic ore, but obviously different from sedimentary exhalative deposit, indicating that the mineralization was closely related to Yanshanian magmatic activity. Due to the metasomatism of Yanshanian acidic magma, a large amount of skarn was formed in the carbonate surrounding rocks. The formation of skarn minerals increased the porosity and permeability of rock, which were conducive to the later formation of sulfur-gold deposits.

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备注/Memo

备注/Memo:
收稿日期:2022-8-25;改回日期:2022-11-22。
基金项目:安徽省自然资源科技项目"安庆—池州—铜陵地区深部成矿背景及深部找矿预测研究(编号:2020-k-13)"、安徽省重点研究与开发项目"铜陵大型资源基地接替资源勘查研究(编号:201904a07020077)"和安徽省地质调查院培育计划项目"安徽铜陵狮子山矿田中生代侵入岩岩石包体对深部成矿作用的指示研究(编号:20KJ-04)"联合资助。
作者简介:周曙光,1966年生,男,高级工程师,大学本科,主要从事矿产地质勘查及研究工作。Email:932753432@qq.com。
通讯作者:蔡杨,1986年生,男,高级工程师,博士,主要从事矿产地质勘查及研究工作。Email:youngtsai@outlook.com。
更新日期/Last Update: 1900-01-01