Thermal-tectonic history of the Baogutu porphyry Cu deposit, West Junggar as constrained from zircon U-Pb, biotite Ar/Ar and zircon/apatite (U-Th)/He dating

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• 作者：Guang-Ming Li ; Ming-Jian Cao ; Ke-Zhang Qin ; Noreen J. Evans ; Brent I.A. McInnes ; Yong-Sheng Liu
• 关键词：Western Junggar ; Baogutu porphyry copper deposit ; Zircon U&ndash ; Pb dating ; Ar/Ar dating ; Zircon (U&ndash ; Th)/He dating ; Apatite (U&ndash ; Th)/He dating ; Thermal-tectonic history
• 刊名：Journal of Asian Earth Sciences
• 出版年：5 January, 2014
• 年：2014
• 卷：79
• 期：Complete
• 页码：741-758
• 全文大小：4216 K

文摘

Understanding postmineralization tectonic movements in porphyry deposits, is critical to interpreting the complete thermal-tectonic history. This study reports new zircon U-Pb ages, hydrothermal biotite ³⁹Ar/⁴⁰Ar age, and zircon and apatite (U-Th)/He ages from the Baogutu porphyry copper deposit, which, in conjunction with pre-existing geochronology and thermochronology and inverse modeling simulations, constrain the thermal-tectonic history of the deposit. Zircon LA-ICP-MS U-Pb concordia ages indicate a Late Carboniferous age of 320.1 卤 2.2 Ma for the diorite complex and 309.8 卤 2.2 Ma for the mineralized granodiorite porphyry. Hydrothermal biotite selected from a quartz-biotite-chalcopyrite vein yields a plateau age of 311.0 卤 1.8 Ma which agrees with the age of the granodiorite porphyry and a previously reported molybdenite Re-Os age, and suggests that hydrothermal fluid circulated about 310 m.y. ago. Diorite and granodiorite porphyry yield weighted mean zircon (U-Th)/He ages of 200.6 卤 5.7 Ma and 241.1 卤 8.1 Ma, respectively, with ages ranging from 221.0 Ma to 174.3 Ma and 225.9 to 261.6 Ma. Weighted mean diorite and granodiorite porphyry apatite (U-Th)/He ages of 87.4 卤 2.3 Ma and 120.0 卤 4.2 Ma were obtained with ages ranging from 68.9 Ma to 100.8 Ma, and from 91.0 Ma to 152.0 Ma, respectively. The wide range of zircon (U-Th)/He ages may be due to the combined effects of U and Th zonation and radiation damage, and radiation damage effect may also account for the wide range of apatite (U-Th)/He ages. The combined effects of depth and cooling due to meteoric water circulation contribute to an older (U-Th)/He age for the granodiorite porphyry, relative to the diorite. A five-episode cooling rate history for the diorite can be deduced by inverse model simulation: fast cooling鈥攎oderate fast cooling鈥攔elatively slow cooling鈥攆ast cooling again鈥攙ery slow cooling. The thermal and tectonic history of the wall rock indicates that it suffered significant far-field effects from the Qiangtang-Eurasia and Lhasa-Qiangtang collision, however, no visible thermal effect from the India-Asia collision is observed.