Late Permian-Triassic metallogeny in the Chinese Altay Orogen: Constraints from mica 40Ar/39Ar dating on ore deposits
Late Permian-Triassic metallogeny in the Chinese Altay Orogen: Constraints from mica 40Ar/39Ar dating on ore deposits
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中国阿尔泰造山带晚二叠世-三叠世成矿作用：云母40Ar/39Ar定年对矿床的制约
DOI：
10.1016/j.gr.2015.08.018
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发表时间：
2017
影响因子：
6.1
通讯作者：
Dengfeng Li
中科院分区：
文献类型：
--
作者：
Yi Zheng;Yanjing Chen;Cawood Peter;Yuejun Wang;Huayong Chen;Li Zhang;Dengfeng Li
中亚造山带（CAOB）是地球上最大的显生宙增生造山带。它绵延 5000 多公里，蕴藏着众多金属矿藏。中国阿尔泰造山带是中亚造山带的重要组成部分，拥有丰富的泥盆纪（约 410–370 Ma）矿床。总结了造山型成矿同生代表性样品中的7种云母分离物的40Ar/39Ar测年结果，记录了中国阿尔泰造山带的二叠纪至三叠纪成矿事件。中国阿尔泰造山带的克兰盆地和麦子盆地可能代表弧增生杂岩，含有一系列低品位变质火山沉积岩中的多金属矿脉矿床。在 Keketale Pb-Zn、Wulasigou Cu、Tiemurt Pb-Zn、Dadonggou Pb-Zn 和 Sarekuobu Au 矿床中，从与含金多金属硫化物共生相关的成矿脉中获得了 2 个白云母和 5 个黑云母分离物。这些分离得到的 40Ar/39Ar 平台年龄范围为 260 Ma 至 205 Ma。将这些结果与其他已发表的地质和年代学数据相结合表明，Au-Cu-Pb-Zn 矿化晚于最终的 CAOB 组合，流体运动和矿化可能是由区域变质作用和变形驱动的。本文提出的成矿模型是，CAOB 最终组装后的变质流体运移导致矿床的形成。
The Central Asian Orogenic Belt (CAOB) constitutes the largest Phanerozoic accretionary orogen on Earth. It extends over 5000 km and hosting numerous metal deposits. The Chinese Altay Orogen, an important element of the CAOB, hosts abundant Devonian (ca. 410–370 Ma) deposits. The40Ar/39Ar dating of seven mica separates from the representative samples syngenetic with orogenic-type mineralization is summarized to record a poorly studied Permian to Triassic metallogenic episode in the Chinese Altay Orogen. The Kelan and Maizi basins in the Chinese Altay Orogen, which likely represent an arc accretionary complex, contain a series of polymetallic lode deposits hosted in low-grade metamorphic volcano–sedimentary rocks. Two muscovite and five biotite separates were obtained from the ore-forming veins paragenetically associated with Au-bearing polymetallic sulfides in the Keketale Pb–Zn, Wulasigou Cu, Tiemurt Pb–Zn, Dadonggou Pb–Zn and Sarekuobu Au deposits. These separates yielded40Ar/39Ar plateau ages ranging from 260 Ma to 205 Ma. Integration of these results with other published geological and geochronological data indicates that the Au–Cu–Pb–Zn mineralization post-dated the final CAOB assembly, with fluid movement and mineralization possibly driven by regional metamorphism and deformation. It is herein proposed for a metallogenic model that the metamorphic fluid migration following final assembly of the CAOB results into the formation of the deposits.