气候变化领域集成服务门户(CCPortal): Molybdenum and Boron Isotopic Compositions of Porphyry Cu Mineralization-Related Adakitic Rocks in Central-Eastern China: New Insights Into their Petrogenesis and Crust-Mantle Interaction

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DOI	10.1029/2020JB020474
	Molybdenum and Boron Isotopic Compositions of Porphyry Cu Mineralization-Related Adakitic Rocks in Central-Eastern China: New Insights Into their Petrogenesis and Crust-Mantle Interaction
	Fan J.-J.; Wang Q.; Li J.; Wei G.-J.; Wyman D.; Zhao Z.-H.; Liu Y.; Ma J.-L.; Zhang L.; Wang Z.-L.
发表日期	2020
ISSN	21699313
卷号	125 期号:12
英文摘要	The voluminous Late Mesozoic porphyry ore-related adakitic magmatism in central-eastern China is crucial to understand the deep geodynamic process of the region and controls on porphyry deposit formation globally. Here, we present a novel study of whole-rock Mo-B isotopes on the mineralization-related adakitic rocks from the Dexing (located in the interior of South China and associated with giant porphyry Cu deposits), and Middle-Lower Yangtze River (MLYR) (host to one of the largest porphyry Cu-Au deposit belts) areas in central-eastern China. The Dexing adakitic rocks have δ98/95Mo ranging from −0.31‰ to −0.01‰ and δ11B from −17.65‰ to −11.49‰. The adakitic rocks from the MLYR area have δ98/95Mo values of −0.5‰ to 0.2‰ and δ11B values of −14.48‰ to −9.53‰. The δ98/95Mo values of both the Dexing and MLYR samples negatively correlate with the La/Yb and La/Sm ratios. Together with the high Mg#, Cr, and Ni contents, these results indicate a process of melt-mantle interaction resulting in hybridization of initial adakitic melts with low δ98/95Mo and mantle-derived melts/components with high δ98/95Mo. These adakitic rocks have distinct Mo isotope systematics compared with those of oceanic slab-derived adakites and MORB-type eclogites. Their relatively low δ11B values and the lack of correlation between δ11B and B contents support a mafic lower crust source for the initial adakitic melts. We thus suggest that these adakitic rocks were generated by partial melting of delaminated lower crust followed by interaction with the deep mantle, and that melt-mantle interaction may facilitate Cu-Mo-Au mineralization. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	adakitic rocks; central-eastern China; crust-mantle interaction; Cu-Mo-Au mineralization; Mo-B isotopes
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187469
作者单位	State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China; College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, China; CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing, China; School of Geosciences, The University of Sydney, Sydney, NSW, Australia; Key laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China
推荐引用方式 GB/T 7714	Fan J.-J.,Wang Q.,Li J.,et al. Molybdenum and Boron Isotopic Compositions of Porphyry Cu Mineralization-Related Adakitic Rocks in Central-Eastern China: New Insights Into their Petrogenesis and Crust-Mantle Interaction[J],2020,125(12).
APA	Fan J.-J..,Wang Q..,Li J..,Wei G.-J..,Wyman D..,...&Wang Z.-L..(2020).Molybdenum and Boron Isotopic Compositions of Porphyry Cu Mineralization-Related Adakitic Rocks in Central-Eastern China: New Insights Into their Petrogenesis and Crust-Mantle Interaction.Journal of Geophysical Research: Solid Earth,125(12).
MLA	Fan J.-J.,et al."Molybdenum and Boron Isotopic Compositions of Porphyry Cu Mineralization-Related Adakitic Rocks in Central-Eastern China: New Insights Into their Petrogenesis and Crust-Mantle Interaction".Journal of Geophysical Research: Solid Earth 125.12(2020).