Metasomatized asthenospheric mantle contributing to the generation of Cu-Mo deposits within an intracontinental setting:A case study of the similar to 128 Ma Wangjiazhuang Cu-Mo deposit, eastern North | |
Ting-Guang Lan; Rui-Zhong Hu![]() ![]() | |
2018 | |
发表期刊 | Journal of Asian Earth Sciences
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卷号 | 160页码:460-489 |
摘要 | Cu-Mo deposits are commonly associated with talc-alkaline porphyries and derived from subduction-modified lithosphere in magmatic arcs. Here we report the Wangjiazhuang Cu-Mo deposit, which is peculiarly associated with an alkaline quartz monzonite that originated from a metasomatized asthenospheric mantle within an intracontinental setting in the eastern North China Craton (NCC). The deposit was formed at ca. 128.3 +/- 0.7 Ma (2 sigma), basically coincident with the emplacement of the host quartz monzonite (128.8 +/- 1.0 Ma, 2 sigma). Pegmatitic vein-type and stockwork-/disseminated-type mineralizations were identified in the deposit, of which the former is shallowly situated and characterized by coarse and well-crystallized Cu- and Mo-bearing sulfides + quartz + biotite + K-feldspar assemblages, whereas the latter is deeply situated and characterized by stockworks or Cu- and Mo-bearing sulfides disseminated in the altered quartz monzonite. Separation between Cu-rich and Morich ore bodies at shallow depth was also observed. The Cu-Mo mineralization is typically associated with potassic-silicic alteration. High-temperature fluid inclusions with halite/sylvite daughter minerals (having homogenization temperatures of 287-466 degrees C and salinities of 33.8-55.3 wt% NaCl equivalent) suggest a magmatic origin of the ore-forming fluids. Differentiation of the fluids into vapor-rich and liquid-rich phases occurred during the magmatic-hydrothermal processes, as indicated by the coexistence of vapor-rich, liquid-rich and daughter mineral-rich fluid inclusions with similar homogenization temperatures. LA-ICP-MS analysis of the fluid inclusions shows that Cu is highly partitioned into the vapor-rich fluid inclusions, whereas Mo is mainly concentrated in the daughter mineral-rich fluid inclusions. This implies that phase differentiation of the oreforming fluids was likely responsible for the separation of Cu-rich and Mo-rich ore bodies. The presence of hematite in the fluid inclusions also suggests high oxidation state of the ore-forming fluids. Based on the variations of delta S-34 in sulfides and Al contents in quartz, continuous reduction of the oxidized ore-forming fluids, coupled with pH change of the fluids during water-rock interaction, led to the deposition of the ore-forming metals. |
关键词 | Cu-mo Deposit la-icp-ms Analysis Of Fluid Inclusion asthenospheric Mantle intracontinental Setting north China Craton |
收录类别 | SCI |
语种 | 英语 |
文献类型 | 期刊论文 |
条目标识符 | http://ir.gyig.ac.cn/handle/42920512-1/8790 |
专题 | 矿床地球化学国家重点实验室 |
作者单位 | 1.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China 2.College of Earth Sciences, University of Chinese Academy of Sciences, Beijing 100049, China 3.State Key Laboratory of Safe Ming and Clean Utilization of Coal Resources, Beijing 100013, China 4.Research Center for Strategy of Global Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China |
推荐引用方式 GB/T 7714 | Ting-Guang Lan,Rui-Zhong Hu,Xian-Wu Bi,et al. Metasomatized asthenospheric mantle contributing to the generation of Cu-Mo deposits within an intracontinental setting:A case study of the similar to 128 Ma Wangjiazhuang Cu-Mo deposit, eastern North[J]. Journal of Asian Earth Sciences,2018,160:460-489. |
APA | Ting-Guang Lan.,Rui-Zhong Hu.,Xian-Wu Bi.,Guang-Jian Mao.,Bo-Jie Wen.,...&Ying-Hua Chen.(2018).Metasomatized asthenospheric mantle contributing to the generation of Cu-Mo deposits within an intracontinental setting:A case study of the similar to 128 Ma Wangjiazhuang Cu-Mo deposit, eastern North.Journal of Asian Earth Sciences,160,460-489. |
MLA | Ting-Guang Lan,et al."Metasomatized asthenospheric mantle contributing to the generation of Cu-Mo deposits within an intracontinental setting:A case study of the similar to 128 Ma Wangjiazhuang Cu-Mo deposit, eastern North".Journal of Asian Earth Sciences 160(2018):460-489. |
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