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西准噶尔谢米斯台山东段早石炭世玄武安山岩的成因及意义

DOI: 10.16539/j.ddgzyckx.2015.05.011, PP. 876-888

Keywords: 西准噶尔,早石炭世,岛弧环境,玄武安山岩

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Abstract:

本文对西准噶尔谢米斯台山东段早石炭世的火山岩进行了Ar-Ar年代学、岩石学和地球化学研究。Ar-Ar定年结果显示,这些火山岩喷发时间为338.7±6.9Ma。在地球化学方面,它们显示钙碱性的特征,富集大离子亲石元素(LILE)和轻稀土元素(LREE),亏损高强场元素(HFSE,如Nb和Ta)以及具有高的Rb/Y和Ba/Nb比值,显示岛弧岩浆的特征。而在Th-Hf/3-Nb/16环境判别图中,所有样品落在岛弧玄武岩区域。结合古地理、古地磁、岩浆岩以及大地构造研究成果,作者认为西准噶尔地区在早石炭世处于岛弧环境,即准噶尔洋向西北侧和东南侧的双向俯冲。在亚洲洋的构造演化过程中,还存在斋桑洋、北天山洋和准噶尔洋等多个洋内俯冲系统。

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