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Geochemistry of late Mesozoic adakites from the Sulu belt, eastern China: magma genesis and implications for crustal recycling beneath continental collisional orogens
Guo, F; Fan, WM; Li, CW; guofengt@263.net
2006
Source PublicationGEOLOGICAL MAGAZINE
ISSN0016-7568
Volume143Issue:1Pages:40556
AbstractBoth low-Al and high-Al adakitic andesites erupted at similar to 114 M a in the Sulu collisional belt, eastern China, provide evidence for recycling of continental crust into the mantle more than 100 million years after the Triassic (similar to 240 Ma) collision between the North China and Yangtze blocks. These rocks display similar normalized trace element patterns, with enrichments in large ion lithophile elements (LILE), light rare earth elements (LREE) and depletions in Nb, Ta and Ti, and have highly radiogenic Sr and non-radiogenic Nd isotopic compositions (high-Al: Sr-87/Sr-86(i) = 0.70645-0.70715 and epsilon(Nd)(t) = -20.1 to -19.1; low-Al: Sr-87/Sr-86(i) = 0.70593-0.70598 and epsilon(Nd)(t) = -17.1 to -15.8). The high-Al (Al2O3 > 15 %) adakitic andesites are compositionally comparable with experimental slab melts, whereas the low-Al series (Al2O3 similar to 13 %) have higher MgO, Cr and Ni, and higher Sr/Y ratios, and are compositionally comparable with slab melts hybridized by mantle peridotites. Combined major- and trace-element and Sr-Nd isotope data indicate that the two types of adakitic andesites have been derived from a LILE- and LREE-enriched eclogitic lower continental crust; in the case of the high-Al adakitic andesites, the melts underwent insignificant mantle contamination, whereas the low-Al magmas reacted with peridotites. Generation of the two types of late Mesozoic adakitic andesites favours a model of lithospheric delamination, leading to asthenospheric upwelling and extensive melting of lower continental crust, including a delaminated block, in the Sulu belt.
DepartmentChinese Acad Sci, Key Lab Marginal Sea Geol, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China; Chinese Acad Sci, S China Sea Inst Oceanol, Guangzhou 510640, Peoples R China
KeywordGeochemistry Lower Continental Crust Adakites Late Mesozoic Sulu Belt
Subject AreaGeosciences, Multidisciplinary
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Indexed Bysci
Funding Project海洋地质
WOS IDWOS:000236366000001
Citation statistics
Cited Times:78[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/4420
Collection中科院边缘海地质重点实验室
Corresponding Authorguofengt@263.net
Recommended Citation
GB/T 7714
Guo, F,Fan, WM,Li, CW,et al. Geochemistry of late Mesozoic adakites from the Sulu belt, eastern China: magma genesis and implications for crustal recycling beneath continental collisional orogens[J]. GEOLOGICAL MAGAZINE,2006,143(1):40556.
APA Guo, F,Fan, WM,Li, CW,&guofengt@263.net.(2006).Geochemistry of late Mesozoic adakites from the Sulu belt, eastern China: magma genesis and implications for crustal recycling beneath continental collisional orogens.GEOLOGICAL MAGAZINE,143(1),40556.
MLA Guo, F,et al."Geochemistry of late Mesozoic adakites from the Sulu belt, eastern China: magma genesis and implications for crustal recycling beneath continental collisional orogens".GEOLOGICAL MAGAZINE 143.1(2006):40556.
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