Lithosphere thinning beneath west North China Craton: Evidence from geochemical and Sr-Nd-Hf isotope compositions of Jining basalts

Guo, Pengyuan, Niu, Yaoling, Ye, Lei, Liu, Jinju, Sun, Pu, Cui, Huixia, Zhang, Yu, Gao, Junping, Su, Li, Zhao, Jianxin and Feng, Yuexing (2014) Lithosphere thinning beneath west North China Craton: Evidence from geochemical and Sr-Nd-Hf isotope compositions of Jining basalts. Lithos, 202-203 37-54. doi:10.1016/j.lithos.2014.04.024

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Author Guo, Pengyuan
Niu, Yaoling
Ye, Lei
Liu, Jinju
Sun, Pu
Cui, Huixia
Zhang, Yu
Gao, Junping
Su, Li
Zhao, Jianxin
Feng, Yuexing
Title Lithosphere thinning beneath west North China Craton: Evidence from geochemical and Sr-Nd-Hf isotope compositions of Jining basalts
Journal name Lithos   Check publisher's open access policy
ISSN 0024-4937
Publication date 2014-01-01
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.lithos.2014.04.024
Volume 202-203
Start page 37
End page 54
Total pages 18
Place of publication Amsterdam, The Netherlands
Publisher Elsevier
Language eng
Subject 1906 Geochemistry and Petrology
Abstract This study shows lithosphere evolution history in the west North China Craton (NCC) from the early Cretaceous to Quaternary by studying the major element, trace element and Sr-Nd-Hf isotope compositions in Jining basalts of 119.6-108.6. Ma, 23.5-21.9. Ma and 1.3-0.11. Ma.The early Cretaceous basalts (119.6-108.6Ma) display enriched characteristics with high contents of incompatible elements, high 87Sr/86Sri, low εNd(t) and low εHf(t). These basalts resulted from partial melting of ancient metasomatized lithospheric mantle, and we consider the 119.6-108.6Ma magmatism as indicating lithosphere thinning in the west NCC. Although the Pacific slab seen seismically in the mantle transition zone beneath eastern China is no older than 60Ma, there exists convincing evidence for the presence of the Paleo-Pacific slab in the transition-zone in the Mesozoic. Thus we propose that the water released from the transition-zone slab hydrated the overlying lithosphere and further converted the base of the lithosphere into asthenosphere. This is the most likely mechanism responsible for the lithosphere thinning in the west NCC and the petrogenesis of the Jining 119.6-108.6Ma basalts.The Jining 23.5-21.9Ma basalts also have high contents of incompatible elements, but they display high εNd(t), high εHf(t) and variably low 87Sr/86Sri. We propose that these Miocene basalts were derived from the asthenosphere with contributions from ancient metasomatized lithospheric mantle during melt ascent. The Jining Quaternary basalts (1.3-0.11Ma) represent the melt of upwelling asthenosphere with low 87Sr/86Sri, high εNd(t) and high εHf(t). Upwelling and decompression melting of the eastward flowing asthenosphere from beneath western plateaus to beneath eastern hilly plains in the Cenozoic is the most plausible mechanism for the petrogenesis of Jining Cenozoic basalts (both of 23.5-21.9Ma and 1.3-0.11Ma), but the Jining 1.3-0.11Ma basalts must have been produced beneath even thinner lithosphere.Taken together geophysical studies and our petrological and geochemical studies of all these three episodes of the Jining basalts, we propose that the lithosphere in the west NCC has been thinning since the early Cretaceous and the thinning continues to the present.
Keyword Cenozoic basalts
Jining volcanic province
Lithosphere thinning
Mesozoic basalts
North China Craton
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Earth Sciences Publications
Official 2015 Collection
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Created: Tue, 24 Jun 2014, 13:33:10 EST by System User on behalf of School of Earth Sciences