东天山沙泉子铁铜矿区火山岩地球化学特征、锆石U-Pb年龄及地质意义
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  • 英文篇名:Geochemistry and zircon U-Pb age of volcanic rocks from the Shaquanzi Fe-Cu deposit in East Tianshan Mountains and their geological significance
  • 作者:徐璐璐 ; 柴凤梅 ; 李强 ; 曾红 ; 耿新霞 ; 夏芳 ; 邓刚
  • 英文作者:XU Lu-lu;CHAI Feng-mei;LI Qiang;ZENG Hong;GENG Xin-xia;XIA Fang;DENG Gang;Xinjiang Key Laboratory for Geodynamic Processes and Metallogenic Prognosis of the Central Asian Orogenic Belt, Xinjiang University;Institute of Mineral Resources, Chinese Academy of Geological Sciences;No.6 Geological Party, Xinjiang Bureau of Geology and Mineral Resources;
  • 关键词:锆石U-Pb年龄 ; Hf同位素 ; 流纹岩 ; 沙泉子铁铜 ; 东天山
  • 英文关键词:volcanic rock;;geochemistry;;zircon U-Pb dating;;Hf isotope;;Shaquanzi Fe-Cu deposit,East Tianshan Mountains
  • 中文刊名:DIZI
  • 英文刊名:Geology in China
  • 机构:新疆大学,新疆中亚造山带大陆动力学与成矿预测实验室;中国地质科学院矿产资源研究所国土资源部成矿作用与资源评价重点开放实验室;新疆地质矿产局第六地质大队;
  • 出版日期:2014-12-15
  • 出版单位:中国地质
  • 年:2014
  • 期:v.41;No.365
  • 基金:国土资源部公益性行业科研专项经费项目(201211073–03);; 国家重点基础研究发展计划“973”项目(2012CB416803)联合资助
  • 语种:中文;
  • 页:DIZI201406002
  • 页数:20
  • CN:06
  • ISSN:11-1167/P
  • 分类号:19-38
摘要
沙泉子铁铜矿床是东天山地区赋存于火山岩中的矿床之一。矿体产于底坎尔组玄武岩与英安岩接触部位,在闪长玢岩与围岩接触带上也可见不规则铁矿化。对火山岩的形成时代以及构造地质背景的研究是重建成矿过程的关键。LA-ICP-MS锆石U-Pb定年结果表明,沙泉子铁铜矿区底坎尔组流纹岩和闪长玢岩的206Pb/238U加权平均年龄分别为(321.7±1.7)Ma和(322.2±1.7)Ma,是早石炭世末岩浆活动的产物。元素地球化学和Hf同位素特征表明,底坎尔组火山岩属钙碱性系列,富集轻稀土元素(LREE)和大离子亲石元素(LILE),亏损高场强元素(Nb、Ta、Ti),具有岛弧火山岩地球化学特征。基性岩来源于受俯冲板片流体交代的亏损地幔,中性岩为基性岩分离结晶的产物,流纹岩是新生地壳物质部分熔融形成。综合前人研究成果表明,沙泉子铁铜矿床形成于早石炭世末陆缘弧环境,铁矿化不早于322 Ma。
        Located along the Aqishan-Yamansu belt of East Tianshan Mountains, the Shaquanzi Fe-Cu deposit is one of the deposits hosted in Paleozoic volcanic rocks. The deposit occurs in the second and third lithologic memberss of the Dikaner Formation consisting of volcanic rocks intercalated with sedimentary rocks. The iron mineralization also occurs at the contact zone between diorite-porphyrite and wall rocks. The tectonic setting and age of the volcanic rocks are key factors in the reconstruction of the ore-forming process. In this paper, representative samples of Dikaner Formation volcanic rocks and diorite-porphyrite in the Shaquanzi Fe-Cu ore district were analyzed for major and trace elements and zircon U-Pb dating was conducted to investigate the tectonic setting and formation ages of these rocks. LA-ICP-MS analyses of zircons with well-defined oscillatory zoning yielded mean206Pb/238 U ages of(321.7 ± 1.7) Ma and(322.7 ± 1.7) Ma, respectively, indicating that they were formed during late Early Carboniferous. The geochemical data suggest that most of the volcanic rocks belong to calc-alkaline series with the enrichment of LILE, LREE and depletion of Nb, Ta, and Ti, similar to the characteristics of arc volcanic rocks. The zircons from rhyolite and diorite-porphyrite have εHf(t)values of +6.28~+15.51 and-0.22~+13.9, respectively. The rhyolites were derived from juvenile crustal materials and basalts, which came from mantle wedge modified by fluids from subducted materials that formed andesite and dioriteporphyrite through crystal fractionation. Regional geology and geochemical evidence indicates that the Dikaner Formation volcanic rocks and diorite-porphyrite were formed simultaneously through island arc magmatism during the late stage of subduction. The Shaquanzi Fe-Cu deposit hosted in the Dikaner Formation were formed after 322 Ma.
引文
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