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广东大宝山多金属矿床两期成矿:来自黑色炭质泥岩和辉钼矿Re-Os同位素定年的证据
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  • 英文篇名:Two Phases of Mineralization in the Dabaoshan Polymetallic Deposit, Guangdong Province: Constraints from Re-Os Geochronology of Black Carbonaceous Mudstone and Molybdenite
  • 作者:向建华 ; 梁新权 ; 单业华 ; 王策 ; 董超阁 ; 余世花 ; 谭志军
  • 英文作者:XIANG Jianhua;LIANG Xinquan;SHAN Yehua;WANG Ce;DONG Chaoge;YU Shihua;TAN Zhijun;State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Science;University of Chinese Academy of Science;
  • 关键词:大宝山 ; Re-Os同位素 ; 多因复成矿床 ; 喷流沉积矿床 ; 斑岩型矿床
  • 英文关键词:Dabaoshan;;Re-Os ages;;polygenetic composite deposit;;SEDEX type deposit;;porphyry deposit
  • 中文刊名:DGYK
  • 英文刊名:Geotectonica et Metallogenia
  • 机构:中国科学院广州地球化学研究所同位素地球化学国家重点实验室;中国科学院大学;
  • 出版日期:2018-08-15
  • 出版单位:大地构造与成矿学
  • 年:2018
  • 期:v.42;No.165
  • 基金:中国地质调查局地质矿产调查评价专项(12120114015601);; 国土资源部公益科研专项(201211024-03);; 国家自然科学基金项目(41576040、40872080和41072081)联合资助
  • 语种:中文;
  • 页:DGYK201804012
  • 页数:14
  • CN:04
  • ISSN:44-1595/P
  • 分类号:148-161
摘要
广东省大宝山多金属矿床位于南岭成矿带中段南侧,为多因复成矿床,包括喷流沉积型Cu-Pb-Zn矿床和叠加斑岩-矽卡岩型W-Mo矿床。系统的野外考察发现,喷流沉积型Cu-Pb-Zn矿床主要以层状-似层状、透镜状和角砾状矿体赋存于中泥盆统棋梓桥组,具有典型喷流沉积型矿床特征;斑岩-矽卡岩型W-Mo矿床主要以斑岩型和矽卡岩型矿体围绕大宝山燕山期花岗闪长(斑)岩产出或叠加在喷流沉积形成的层状-似层状矿体之上。对矿区内斑岩-矽卡岩型W-Mo矿床中辉钼矿和喷流沉积型Cu-Pb-Zn矿床中炭质泥岩进行Re-Os同位素定年研究表明,辉钼矿Re-Os等时线年龄为163.6?1.0 Ma(MSWD=0.58),代表了斑岩-矽卡岩型矿床的形成年龄;炭质泥岩Re-Os等时线年龄为387.6?9.9 Ma(MSWD=56),代表同沉积矿床即喷流沉积矿床形成年龄。这反映大宝山多金属矿床至少存在两期重要的成矿事件:斑岩-矽卡岩型W-Mo矿床形成与燕山期中酸性岩浆活动相关,层状-似层状Cu-Pb-Zn矿床形成与海西期海底热液喷流沉积相关。
        The Dabaoshan polymetallic deposit is a polygenetic composite ore deposit located at south of the Qinhang(Qinzhou-Hangzhou) Metallogenic Belt, which is composed mainly of SEDEX type Cu-Pb-Zn and porphyry-skarn type W-Mo orebodies. Systematic field study shows that the W-Mo mineralization exhibits as quartz-vein type and skarn type orebodies around the granodioritic porphyry, or superimposes on the SEDEX type Cu-Pb-Zn orebody, while the Cu-Pb-Zn mineralization occurs mainly in the Qiziqiao Formation as stratiform-substratiform type and breccia type orebodies with typical SEDEX-type characteristics. Re-Os dating of five molybdenite separates from porphyry-skarn type W-Mo orebodies yielded isochron ages of 163.6±1.0 Ma(MSWD=0.58), which represents the age of W-Mo mineralization. Re-Os dating of seven black carbonaceous mudstone samples from a Cu-Pb-Zn orebody yielded isochron age of 387.6±9.9 Ma(MSWD=56), which is interpreted to be the age of SEDEX-type Cu-Pb-Zn mineralization. These ages indicate that there are at least two stages of ore mineralization in the Dabaoshan polymetallic deposit. The W-Mo mineralization is related to the Yanshanian intermediated-acidic intrusions, while the stratiform-substratiform SEDEX-type Cu-Pb-Zn mineralization is associated with the Hercynian seafloor hydrothermal activities.
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