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2012, 31(1) 40-50 DOI:
ISSN: 1004-5589 CN: 22-1111/P |
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Geochemical characteristics and tectonic significance of Late Carboniferous volcanic rocks in Benbatu Formation of Sonid Youqi��Inner Mongolia |
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PO Shi-Yu-1, CHI Xiao-Guo-1, SUN Wei-1, QUAN Jing-Yu-1, HU Zhao-Chu-2, DA Jia-Wei-1 |
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1. College of Earth Sciences��Jilin University��Changchun 130061��China; 2. State Key Laboratory of Geological Process and Mineral Resource��China University of Geosciences��Wuhan 430074��China |
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Abstract��
The volcanic rocks of Benbatu Formation in Sonid Youqi mainly consist of basaltic-andesite and andesite with a little dacite�� Zircon U--Pb isotopic dating reveals the andesite formed in 300. 9 ± 1. 6 Ma�� The volcanic rocks generally belong to the tholeiitic series with low K and comparatively high Fe in geochemical characteristics�� Trace elements are characterized by REE weak fractionation��incompatible elements ( Th��U��La��Ce) enrichment and HFSE ( Nb��Ta��Ti) depletion��which is similar to the St�� Kitts island arc volcanic rocks�� The rocks of Benbatu Formation show Eu in negative anomaly and Sr in low content��indicating the magma evolution experienced plagioclase fractional crystallization��which also led to the rocks poor in Al and rich in Na�� The volcanic rocks of Benbatu Formation in Sonid Youqi area originated from the partial melting by the subduction of mantle wedge��and the formation of the rocks is related to the subduction of Paleo-Asian Ocean plate�� |
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Keywords��
Paleo-Asian Ocean
Late Carboniferous volcanic rocks
island arc low-K tholeiitic series
SonidYouqi
Inner Mongolia
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Received Revised Online: |
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