Geochronology and geochemistry of the five magmatic rocks in the Ningzhen region, China
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  • 英文篇名:Geochronology and geochemistry of the five magmatic rocks in the Ningzhen region, China
  • 作者:Shunfu ; Lu ; Xiaoqing ; Zhu ; Xiaofen ; Li
  • 英文作者:Shunfu Lu;Xiaoqing Zhu;Xiaofen Li;State Key Laboratory of Ore Deposit Geochemistry Institute of Geochemistry, Chinese Academy of Sciences;University of Chinese Academy of Sciences;Earthquake Administration of Hubei Province;
  • 英文关键词:Intermediate–acidic intrusive complexes;;LA– ICP–MS zircon U–Pb dating;;Geochemistry;;Geodynamic setting;;Ningzhen region
  • 中文刊名:Acta Geochimica
  • 英文刊名:地球化学学报(英文版)
  • 机构:State Key Laboratory of Ore Deposit Geochemistry Institute of Geochemistry, Chinese Academy of Sciences;University of Chinese Academy of Sciences;Earthquake Administration of Hubei Province;
  • 出版日期:2019-04-15
  • 出版单位:Acta Geochimica
  • 年:2019
  • 期:02
  • 基金:financially supported by the Major State Basic Research Development Program of China (973 Program) (No. 2014CB440906)
  • 语种:英文;
  • 页:71-91
  • 页数:21
  • CN:52-1161/P
  • ISSN:2096-0956
  • 分类号:P59;P588.1
摘要
The Ningzhen region of China is located in the easternmost part of the middle-lower Yangtze River Cu–Fe polymetallic metallogenic belt. From west to east, it comprises five main intermediate–acidic intrusive complexes: the Qilinmen, Anjishan, Xiashu–Gaozi, Shima, and Jianbi complexes. Geochemical investigations show that these five intrusive complexes exhibit high contents of SiO_2, at 64.74–73.40 wt%, Al_2O_3, at 14.15–17.37 wt%, and K_2O + Na_2O, at 6.49–8.68 wt%. The majority of the samples belong to the high-K calc-alkaline series, with a few samples plotting in the calc-alkaline and tholeiitic series. Trace element analysis shows that the samples are enriched in large ion lithophile elements(LILE) and are depleted in high field strength elements(HFSE).The chondrite-normalized rare earth element(REE) patterns are characterized by right-inclined curves, showing light rare earth element(LREE) enrichment. In addition,the(La/Yb)Nratios are high at 15.02–37.28, with an average of 29.13, and slightly negative or none Eu anomalies are present. In the(La/Yb)N–d Eu diagram, the samples plot within the crust-mantle type field. Laser ablation–inductively coupled plasma–mass spectrometry(LA–ICP–MS) zircon U–Pb dating yielded ages of122.0 ± 1.0 Ma, 106.1 ± 0.8 Ma, 108.7 ± 1.4 Ma,103.5 ± 1.9 Ma, and 96.8 ± 1.7 Ma for the Qilinmen,Anjishan, Xiashu–Gaozi, Shima, and Jianbi complexes,respectively. On the basis of this research and knowledge of several known metal deposits related to these complexes, we suggest that the Mesozoic large-scale diagenesis and metallogenesis in the Ningzhen region may have ceased at 100 Ma or about 95 Ma.
        The Ningzhen region of China is located in the easternmost part of the middle-lower Yangtze River Cu–Fe polymetallic metallogenic belt. From west to east, it comprises five main intermediate–acidic intrusive complexes: the Qilinmen, Anjishan, Xiashu–Gaozi, Shima, and Jianbi complexes. Geochemical investigations show that these five intrusive complexes exhibit high contents of SiO_2, at 64.74–73.40 wt%, Al_2O_3, at 14.15–17.37 wt%, and K_2O + Na_2O, at 6.49–8.68 wt%. The majority of the samples belong to the high-K calc-alkaline series, with a few samples plotting in the calc-alkaline and tholeiitic series. Trace element analysis shows that the samples are enriched in large ion lithophile elements(LILE) and are depleted in high field strength elements(HFSE).The chondrite-normalized rare earth element(REE) patterns are characterized by right-inclined curves, showing light rare earth element(LREE) enrichment. In addition,the(La/Yb)Nratios are high at 15.02–37.28, with an average of 29.13, and slightly negative or none Eu anomalies are present. In the(La/Yb)N–d Eu diagram, the samples plot within the crust-mantle type field. Laser ablation–inductively coupled plasma–mass spectrometry(LA–ICP–MS) zircon U–Pb dating yielded ages of122.0 ± 1.0 Ma, 106.1 ± 0.8 Ma, 108.7 ± 1.4 Ma,103.5 ± 1.9 Ma, and 96.8 ± 1.7 Ma for the Qilinmen,Anjishan, Xiashu–Gaozi, Shima, and Jianbi complexes,respectively. On the basis of this research and knowledge of several known metal deposits related to these complexes, we suggest that the Mesozoic large-scale diagenesis and metallogenesis in the Ningzhen region may have ceased at 100 Ma or about 95 Ma.
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