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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
发表期刊GEOLOGICAL MAGAZINE
ISSN0016-7568
卷号143期号:1页码:40556
摘要Both 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.
部门归属Chinese 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
关键词Geochemistry Lower Continental Crust Adakites Late Mesozoic Sulu Belt
学科领域Geosciences, Multidisciplinary
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收录类别sci
资助项目海洋地质
WOS记录号WOS:000236366000001
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被引频次:75[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/4420
专题中科院边缘海地质重点实验室
通讯作者guofengt@263.net
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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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