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    Volume 37 Issue 3
    May  2012
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    Article Contents
    HUANG Xing-kai, MO Xuan-xue, YU Xue-hui, LI Yong, HE Wen-yan, LI Xiao-wei, 2012. Petro-Geochemical Characteristics and Tectonic Setting of Cenozoic Shoshonitic Basalts from Maguan, Yunnan Province. Earth Science, 37(3): 463-474. doi: 10.3799/dqkx.2012.053
    Citation: HUANG Xing-kai, MO Xuan-xue, YU Xue-hui, LI Yong, HE Wen-yan, LI Xiao-wei, 2012. Petro-Geochemical Characteristics and Tectonic Setting of Cenozoic Shoshonitic Basalts from Maguan, Yunnan Province. Earth Science, 37(3): 463-474. doi: 10.3799/dqkx.2012.053

    Petro-Geochemical Characteristics and Tectonic Setting of Cenozoic Shoshonitic Basalts from Maguan, Yunnan Province

    doi: 10.3799/dqkx.2012.053
    • Received Date: 2011-11-29
      Available Online: 2021-11-09
    • Publish Date: 2012-05-01
    • A suite of Cenozoic shoshonitic basalts bearing abundant mantle-derived xenoliths and xenocrysts outcropped in Maguan area, Yunnan Province. This study provides results of petrological and geochemical characteristics of the Cenozoic shoshonitic volcanic rocks, aiming to offer some food to thoughts related to volcanism and mantle-crust interation induced by to the continental collision between India and Asia plates. Results showed that Cenozoic shoshonitic basalts from this area have relatively high and variable alkali contents (2.94%-8.23%), and are rich in potassium (average K2O/Na2O of 21 samples is 1.26). They are classified as shoshonitic basalts or basanite. They are enriched in both light rare earth elements (LREE) and large ion lithophile elements (LILE), and distribution patterns in the chondrite-normalized diagram and primitive-normalized spidergram collectively resemble the pattern of OIB. The shoshonitic basalts contain abundant mantle-derived xenoliths and xenocrysts, and are poorly crystallized with very low contents of phenocrysts, and have considerably high abundance of compatible elements such as Ni, implying that the Cenozoic basaltic rocks of Maguan area are representatives of primary magma derived from mantle sources. The relatively low Mg# of rocks, ranging from 0.49 to 0.72, can either be ascribed to the intrinsic characteristics of the source region or to the mixing of crust and mantle materials in the source region, which needs to be further studied. The Cenozoic shoshonitic basalts formed in a within-plate tectonic setting, the petrogenesis of which is related to the lateral extrusion of asthenospheric mantle along the southeastern of Tibetan plateau induced by the Indo-Asia collision.

       

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