Petrology, geochemistry and Nd-Sr isotope of late Miocene basalts in Liehyu and Chinmen, Fujian

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Authors:Yan, Ching-Ying; Chung, Sun-Lin; Mertzman, Stanley A.; Hsu, Wen-Yu
Author Affiliations:Primary:
Academia Sinica, Institute of Earth Sciences, Taipei, Taiwan
Other:
National Taiwan University, Taiwan
Franklin and Marshall College, United States
Volume Title:Journal of the Geological Society of China
Source:Journal of the Geological Society of China, 37(3), p.309-334. Publisher: Geological Society of China, Taipei, Taiwan. ISSN: 1018-7057
Publication Date:1994
Note:In English with Chinese summary. 50 refs.; illus., incl. 7 tables, geol. sketch maps
Summary:These basaltic rocks are generally tholeiitic; mineralogically the phenocrysts comprise plagioclase (An42-66) and clinopyroxene (augite, subcalcic augite to Mg-pigeonite) and minor olivine (Fo76-81), picotite (Cr-spinel) and ilmenite. They are moderately LREE-enriched and plot in the within-plate basalt field on Zr/Y vs Zr, Ti/100-Zr-3Y and Hf/3-Th-Ta discrimination diagrams. No depletion of the HFSE is observed in the primitive-mantle normalized diagram. The Sr isotopic ratios are limited (0.7042-0.7045), while εNd values are +1.0 to +3.5. Overall, the tholeiites exhibit coherent mineralogical, petrochemical and Sr-Nd isotopic trends with their Neogene counterparts in SE Fujian, the Penghu islands and NW Taiwan. Samples from all these areas display similar geochemical and isotopic charactersitics to intraplate basalts from Hainan Island and seamount basalts from the S China Sea. All were generated by decompressional melting, coupled with lithosphere-asthenosphere interactions, resulting from the continental extension related to the opening of the S China Sea. [R.E.S.]
Subjects:Alkaline earth metals; Basalts; Cenozoic; Geochemistry; Igneous rocks; Isotope ratios; Isotopes; Metals; Miocene; Nd-144/Nd-143; Neodymium; Neogene; Rare earths; Sr-87/Sr-86; Stable isotopes; Strontium; Tertiary; Trace elements; Upper Miocene; Volcanic rocks; Asia; China; Far East; Fujian China; Chinmen China; Liehyu China
Coordinates:N243000 N243000 E1183000 E1183000
Abstract Numbers:96M/642
Record ID:1995068968
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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