Precise Re-Os Dating of Molybdenite from the Northern Dabie Molybdenum Belt in Central China and its Geodynamic Implications
Precise Re-Os Dating of Molybdenite from the Northern Dabie Molybdenum Belt in Central China and its Geodynamic Implications
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DOI：
10.4028/www.scientific.net/amr.535-537.1035
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发表时间：
2012-06
期刊：
影响因子：
--
通讯作者：
Jun Li;Yong Li;K. Xie
中科院分区：
文献类型：
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作者：
Jun Li;Yong Li;K. Xie
大别造山带位于中国中东部，是华北与扬子两大造山带的分界线，其特征是~ 400 Ma的桐柏变质带与~ 220 Ma的南秦岭-大别变质带并置。三叠纪华北与扬子板块碰撞形成商城、兴县、灵山等岩体和唐家坪、大银尖、母山等小岩体，这些浅侵位花岗斑岩与斑岩-矽卡岩型钼、钼钨矿床密切相关，形成大别钼成矿带。钼矿床产于斑岩的内接触带和外接触带中，包括三种主要的钼矿物系统，斑岩型、少量斑岩-矽卡岩型和脉型。大别地区钼矿床的成矿年龄主要集中在127.8±0.9~113.1±7.9Ma。这种脉动是中国东部构造体制由南北向近东西向转换的产物。
The Dabie orogen of east-central China marks the boundary between the North China and Yangtze Cratons, and is characterized by juxtaposition of the ~400Ma Tongbai metamorphic belt and the ~220Ma South Qinling-Dabie metamorphic belt. The Triassic collision between the North China and Yangtze Cratons which generated numerous granitoid intrusions such as the Shangcheng, Xingxian and Lingshan intrusions, and other small stocks, such as Tangjiaping, Dayinjian, Mushan and so on. Those shallow-emplaced granite porphyries are closely related to porphyry-skarn Mo and Mo-W deposites, forming the Dabie molybdenum metallogenic belt. Molybdenum deposits occur in the endo- and exocontact zones of the porphyry, include with three major types of Mo mineral systems, i.e., porphyry, less porphyry-skarn and vein-type. The ore-forming ages of the molybdenum deposits in Dabie area are mainly cluster 127.8±0.9~113.1±7.9Ma. The pulse is the product of the transformation of the tectonic regime from NS- to nearly EW-directions in East China.