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Sr, Nd, and Pb isotopic compositions of Hainan basalts (south China): Implications for a subcontinental lithosphere Dupal source

1991; Geological Society of America; Volume: 19; Issue: 6 Linguagem: Inglês

10.1130/0091-7613(1991)019 2.3.co;2

1943-2682

Kan Tu, Martin F. J. Flower, Richard W. Carlson, Ming Zhang, Guanghong Xie,

earthquake and tectonic studies

Research Article| June 01, 1991 Sr, Nd, and Pb isotopic compositions of Hainan basalts (south China): Implications for a subcontinental lithosphere Dupal source Kan Tu; Kan Tu 1Department of Geological Sciences, University of Illinois, P.O. Box 4348, Chicago, Illinois 60680 Search for other works by this author on: GSW Google Scholar Martin F. J. Flower; Martin F. J. Flower 1Department of Geological Sciences, University of Illinois, P.O. Box 4348, Chicago, Illinois 60680 Search for other works by this author on: GSW Google Scholar Richard W. Carlson; Richard W. Carlson 2Department of Terrestrial Magnetism, Carnegie Institution of Washington, Washington, D.C. 20015 Search for other works by this author on: GSW Google Scholar Ming Zhang; Ming Zhang 1Department of Geological Sciences, University of Illinois, P.O. Box 4348, Chicago, Illinois 60680 Search for other works by this author on: GSW Google Scholar Guanghong Xie Guanghong Xie 3Institute of Geochemistry, Academia Sinica, Guangzhou 510640, China Search for other works by this author on: GSW Google Scholar Geology (1991) 19 (6): 567–569. https://doi.org/10.1130/0091-7613(1991)019 2.3.CO;2 Article history first online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation Kan Tu, Martin F. J. Flower, Richard W. Carlson, Ming Zhang, Guanghong Xie; Sr, Nd, and Pb isotopic compositions of Hainan basalts (south China): Implications for a subcontinental lithosphere Dupal source. Geology 1991;; 19 (6): 567–569. doi: https://doi.org/10.1130/0091-7613(1991)019 2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Sr, Nd, and Pb isotopic ratios were determined for postspreading basalts from Hainan Island, erupted in a quasi-oceanic pull-apart trough at the northern edge of the South China Basin. The basalts comprise quartz tholeiite, olivine tholeiite, alkali basalt, and basanite and show oceanic island basalt (OIB)-type trace element distributions relatively enriched in Nb, Ta, and Th. Despite normal OIB-like Sr and Nd isotopic compositions, Hainan lavas have unexpectedly high 208Pb/204Pb and 207pb/204Pb ratios, resembling those of Southern Hemisphere Dupal OIB and some alkalic arc basalts. We propose that the Hainan source comprises a lower lithospheric region of accreted asthenospheric melt (isotopically resembling Central Indian Ridge-type basalt) overprinted by radiogenic melts of subducted sediment. In the absence of a mantle plume, decompression melting of subcontinental lithospheric mantle may result from lithosphere stretching, as a regional response to the Indo-Eurasian collision. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.