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The lithospheric thickness control on the compositional variation of continental intraplate basalts : a demonstration using the Cenozoic basalts and clinopyroxene megacrysts from eastern China.

Sun, P. and Niu, Y.L. and Guo, P.Y. and Duan, M. and Wang, X.H. and Gong, H.M. and Xiao, Y.Y. (2020) 'The lithospheric thickness control on the compositional variation of continental intraplate basalts : a demonstration using the Cenozoic basalts and clinopyroxene megacrysts from eastern China.', Journal of geophysical research., 125 (3). e2019JB019315.

Abstract

Studies on intra‐plate ocean island basalts have demonstrated the control of lithosphere thickness on the extent of melting and pressure of melt extraction (i.e., the lid‐effect). However, whether lithosphere thickness also controls the composition of within‐continent basalts remains unclear. Here we test this hypothesis by studying the Cenozoic basalts containing clinopyroxene megacrysts from 10 localities throughout eastern continental China with a north‐south spatial coverage in excess of 2500 km. Indeed, the geochemical parameters (e.g., abundances and ratios of major and trace elements) correlate well with the depth of the lithosphere‐asthenosphere boundary (LAB) calculated using the clinopyroxene barometry, showing significant lithospheric thickness control on basalt compositions. These observations offer further evidence for melt pooling (a melt rich layer) close beneath the LAB as a “stable magma reservoir” for crystallizing compositionally uniform clinopyroxene megacrysts to be carried by subsequent pulses of melt transport and eruption.

Item Type:Article
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1029/2019JB019315
Publisher statement:Sun, P., Niu, Yaoling, Guo, P.Y., Duan, M., Wang, X.H., Gong, H.M. & Xiao, Y.Y. (2020). The lithospheric thickness control on the compositional variation of continental intraplate basalts: A demonstration using the Cenozoic basalts and clinopyroxene megacrysts from eastern China. Journal of Geophysical Research 125(3): e2019JB019315. 10.1029/2019JB019315. To view the published open abstract, go to https://doi.org/ and enter the DOI.
Date accepted:02 March 2020
Date deposited:03 March 2020
Date of first online publication:13 March 2020
Date first made open access:13 September 2020

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