Geochronology and geochemistry of the Badaguan porphyry Cu–Mo deposit in Derbugan metallogenic belt of the NE China, and their geological significances

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• 作者：Bingyu Gao ; Lianchang Zhang ; Xindi Jin…
• 关键词：Derbugan metallogenic belt ; Mongol–Okhotsk Orogen ; Badaguan porphyry Cu–Mo deposit ; Adakite ; Triassic
• 刊名：International Journal of Earth Sciences
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：105
• 期：2
• 页码：507-519
• 全文大小：4,428 KB
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• 作者单位：Bingyu Gao (1)
  Lianchang Zhang (1)
  Xindi Jin (2)
  Wenjun Li (1)
  Zhiguang Chen (1)
  Mingtian Zhu (1)
  
  1. Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China
  2. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geology
  Geophysics and Geodesy
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1437-3262

文摘

The Badaguan porphyry Cu–Mo deposit belongs to the Derbugan metallogenic belt, which is located in the Ergun block, NE China. In the mining area, the Cu–Mo mineralization mainly occurs in quartz diorite porphyry and is hosted within silicified-sericitized and sericite alteration zone. Geochemical results of the host porphyry is characterized by high SiO₂, high Al₂O₃, low MgO, weak positive Eu anomalies and clearly HREE depletion, high Sr, low Y and low Yb, similar to those of adakite. The Sr–Nd isotopic composition of the host porphyry displays an initial (87Sr/86Sr)_i ratio of 0.7036–0.7055 and positive _Nd(t) values of +0.1 to +0.6, which are similar to the OIB, reflecting the source of the host porphyry may derive from subducted ocean slab, and the new lower crust also had some contribution to the magma sources. The SIMS zircon U–Pb age from the host porphyry is 229 ± 2 Ma. The Re–Os isochron age for the molybdenite in the deposit is 225 ± 2 Ma closed to zircon U–Pb age of the host porphyry, indicating that Cu–Mo mineralization event occurred in Triassic. Combining the geology–geochemistry of the host porphyry and the regional tectonic evolution, we infer that the subduction processes of Mongol–Okhotsk oceanic slab under the Ergun block led to the formation of the Badaguan porphyry Cu–Mo deposit during the Triassic. Keywords Derbugan metallogenic belt Mongol–Okhotsk Orogen Badaguan porphyry Cu–Mo deposit Adakite Triassic