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DOI10.1130/B35196.1
Generation of Late Cretaceous Ji'an basalts through asthenosphere-slab interaction in South China
Wu, Yangming1,2; Guo, Feng1; Wang, Xuan-Ce3,4; Zhang, Bo1,2; Zhang, Xiaobing1,2; Alemayehu, Melesse1; Wang, Guoqing1,2
2020-05-01
发表期刊GEOLOGICAL SOCIETY OF AMERICA BULLETIN
ISSN0016-7606
EISSN1943-2674
出版年2020
卷号132期号:5-6页码:1316-1332
文章类型Article
语种英语
国家Peoples R China; Australia
英文摘要

Recycled crustal components have been widely identified in the source of continental basalts with geochemical features similar to oceanic island basalts (OIBs). However, the mechanism of how these recycled materials are involved remains highly debatable. Here we conduct comprehensive geochemical analyses (including whole-rock, olivine, and melt inclusion) and numerical modeling on Late Cretaceous Ji'an basalts from South China interior, aiming to investigate the possible role of recycled crustal components in basalt petrogenesis driven by the subducted paleo-Pacific oceanic plate. The Ji'an basalts show geochemical characteristics akin to OIBs and have depleted asthenospheric mantle-like Sr-Nd-Pb-Hf isotopic compositions with moderately radiogenic Os. Their olivine-hosted melt inclusions have low H2O and highly negative delta D values and olivine phenocrysts are mainly characterized by depletion of O-18 with delta O-18 values lowering to 3.9 parts per thousand. These features are consistent with positive Sr and Eu anomalies in some whole-rock samples. The combined geochemical data suggest that the primary magmas were derived from an asthenospheric mantle enriched by melts from an altered gabbroic oceanic crust, which had experienced intensive dehydration. Further numerical modeling shows that melting of the dehydrated oceanic crust can occur along the torn flank of the subducting lithosphere, in the case that the slab is strongly thinned and fractured. The low delta O-18 preserved in olivine and the estimated slab age (<300 Ma) from the radiogenic whole-rock Os and Pb compositions also require the involvement of a recently recycled slab, probably represented by the subducted paleo-Pacific oceanic plate. Rollback of the subducting paleo-Pacific slab might create a slab window, in which melt from the torn/fractured slab reacted with the upwelling asthenosphere to form an enriched mantle source for the Ji'an basalts and similar counterparts.


领域地球科学
收录类别SCI-E
WOS记录号WOS:000530917400026
WOS关键词CRUST-MANTLE INTERACTION ; MELT INCLUSIONS ; SE CHINA ; CENOZOIC BASALTS ; TRACE-ELEMENTS ; OCEANIC-CRUST ; GEOCHEMICAL EVIDENCE ; LITHOSPHERIC MANTLE ; HYDROGEN ISOTOPE ; NORTHEAST CHINA
WOS类目Geosciences, Multidisciplinary
WOS研究方向Geology
引用统计
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/279464
专题地球科学
作者单位1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China;
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China;
3.Yunnan Univ, Res Ctr Earth Syst Sci, Yunnan Key Lab Earth Syst Sci, Kunming 650500, Yunnan, Peoples R China;
4.Univ Queensland, Sch Earth & Environm Sci, Radiogen Isotope Facil, Brisbane, Qld 4072, Australia
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GB/T 7714
Wu, Yangming,Guo, Feng,Wang, Xuan-Ce,et al. Generation of Late Cretaceous Ji&#39;an basalts through asthenosphere-slab interaction in South China[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2020,132(5-6):1316-1332.
APA Wu, Yangming.,Guo, Feng.,Wang, Xuan-Ce.,Zhang, Bo.,Zhang, Xiaobing.,...&Wang, Guoqing.(2020).Generation of Late Cretaceous Ji'an basalts through asthenosphere-slab interaction in South China.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,132(5-6),1316-1332.
MLA Wu, Yangming,et al."Generation of Late Cretaceous Ji'an basalts through asthenosphere-slab interaction in South China".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 132.5-6(2020):1316-1332.
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