新疆东天山哈密五堡地区中奥陶世大柳沟组火山岩岩石学和地球化学特征

Abstract

Abstract: The middle Ordovician volcanic rocks of the Daliugou Group in the Hami-Wupu area of the Eastern Tianshan seem to be the oldest strata of the studied area. Its tectonic setting belongs to the Dananhu composite island arc volcanic belt of the Junggar plate. Here the volcanic rocks of the Daliugou Group belong predominantly to calcalkaline series and are featured by the enrichment and positive anomalies of Ba and Th of the largeion lithophile element(LIL ) group and by negative anomalies of Nb, Ta, Zr, Hf and Ti of the high strenghth field elements (HFS). LREE is enriched while HREE is depleted in the intermediatebasic volcanic rocks. The study of the trace and rare earth elements indicates that the volcanic rocks belong to an islandarc environment in general.

Key words: middle Ordovician, volcanic rock, geochemistry, Xinjiang, Eastern Tianshan

CLC Number:

P588.1

TIAN Wen-quan，WANG Pu-jun，LI Song-ling，SUN Xiao-meng,WEN Nuan,LIU Xin. Petrography and Geochemistry of the Middle Ordovician Volcanic Rocks of Daliugou Group in Hami Wupu Area of Eastern Tianshan, Xinjiang[J].J4, 2005, 35(03): 296-0301.

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Petrography and Geochemistry of the Middle Ordovician Volcanic Rocks of Daliugou Group in Hami Wupu Area of Eastern Tianshan, Xinjiang