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Crustal architecture and metallogeny associated with the paleo-Tethys evolution in the Eastern Kunlun Orogenic Belt,Northern Tibetan plateau

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Geoscience Frontiers 2023年第6期14卷 286-306页

作者： Xinming Zhang Xu Zhao Lebing Fu Yanjun Li Andreas Kamradt m.Santosh Chongwen Xu Xiaokun Huang Gregor Borg Junhao Wei School of Earth Resource China University of GeoscienceWuhan 430074China Institute of Geosciences and Geography Martin Luther University Halle-WittenbergHalle(Saale)06120Germany CAS Key Laboratory of mineralogy and metallogeny/Guangdong provincial Key Laboratory of mineral physics and materials Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou 510640China School of Earth Science and Resources China University of GeosciencesBeijing 100083China department of Earth Sciences University of AdelaideAdelaideSA 5005Australia

The Eastern Kunlun Orogenic Belt(ekob)in the Northern Tibet plateau hosts a wide variety of metal deposits related to the Late paleozoic to mesozoic *** this study,we investigate the spatiotemporal distribution of the Late paleozoic to mesozoic granitic rocks and associated metal deposits in the ekob and provide a comprehensive compilation of the geochronological,geochemical and isotopic data on these *** compute regional zircon Hf isotope and crustal thickness maps from the data,based on which a comprehensive model is proposed involving subduction(ca.270–240 ma),continental collision(ca.240–224 ma),and post-collisional extension(ca.224–200 ma)for the Late paleozoic to mesozoic paleo-Tethys evolution in the *** Hf isotopic and crustal thickness mapping of Late paleozoic to mesozoic magmatic rocks was carried out to evaluate their spatio-temporal and genetic links with the regional *** polymetallic Fe-skarn and porphyry Cu(mo)deposits in the ekob are located above the moho uplift region,featuring a comparatively thin *** associated with porphyry Cu(mo)and polymetallic Fe skarn mineralization are commonly characterized by highε_(Hf)(t)and younger T_(dm)cvalues,whereas granite related to Cu-mo-Sn skarn deposits exhibit more variableε_(Hf)(t)values,T_(dm)c ages,and the crust thickness,which suggest that more crustal materials contributed to the formation of Cu-mo-Sn skarn deposits than those for porphyry Cu(mo)and polymetallic Fe skarn *** contrast,vein-type Au deposits are located primarily where the moho surface displays a depression,i.e.,where the continental crust is relatively *** magmatic rocks associated with Au mineralization are characterized by lowε_(Hf)(t)and high T_(dm)cvalues,representing reworked ancient crustal components,similar to those associated with porphyry mo and epithermal Ag-pb-Zn-(Au)*** study indicates that the emplacement of magmatic-hydrothermal deposits was controlled

关键词： Hf-isotopic mapping Crustal thickness metallogeny Tectonic evolution Crustal architecture Eastern Kunlun Orogenic Belt

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