西天山石炭纪火山岩岩石学及Sr-Nd同位素地球化学研究

朱永峰 周晶 郭璇. 西天山石炭纪火山岩岩石学及Sr-Nd同位素地球化学研究[J]. 岩石学报, 2006, 22(5): 1341-1350.
引用本文: 朱永峰 周晶 郭璇. 西天山石炭纪火山岩岩石学及Sr-Nd同位素地球化学研究[J]. 岩石学报, 2006, 22(5): 1341-1350.
ZHU YongFeng, ZHOU Jing and GUO Xuan. Petrology and Sr-Nd isotopic geochemistry of the Carboniferous volcanic rocks in the western Tianshan Mountains, NW China.[J]. Acta Petrologica Sinica, 2006, 22(5): 1341-1350.
Citation: ZHU YongFeng, ZHOU Jing and GUO Xuan. Petrology and Sr-Nd isotopic geochemistry of the Carboniferous volcanic rocks in the western Tianshan Mountains, NW China.[J]. Acta Petrologica Sinica, 2006, 22(5): 1341-1350.

西天山石炭纪火山岩岩石学及Sr-Nd同位素地球化学研究

  • 基金项目:

    国家重点基础研究发展规划“中国西部中亚型造山与成矿”2001CB409802课题和国家自然科学基金项目(批准号40572033)资助.

Petrology and Sr-Nd isotopic geochemistry of the Carboniferous volcanic rocks in the western Tianshan Mountains, NW China.

  • 西天山石炭纪火山岩连续从玄武岩、粗面质玄武安山岩、粗面安山岩、粗面岩一直演化到流纹岩。不同地区火山岩的同位素组成差别很大。出露在拉尔敦达坂一带的晚石炭世粗面安山岩-粗面岩具有较高的εNd(t)值(+2、68~+4.29)和较高的初始^87Sr/^86Sr值(0、7015~0.7051)。新源城南的早石炭世粗面安山岩.流纹岩具有相对较低的εNd(t)值(-0.22~+0.87)和变化较大的初始^87Sr/^86Sr值(0.7045~0.7068)。早石炭世玄武岩的初始^87Sr/^86Sr值较低且变化范围较小(0.7045~0.7058),εNd(t)值高且变化范围大(+0.89~+3.04)。本文的同位素地球化学资料以及前期的年代学研究表明,西天山晚泥盆-早石炭世岛弧自西向东逐渐消亡,取而代之的是晚石炭世碰撞后富钾岩浆的喷发。
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出版历程
收稿日期:  2005-12-12
修回日期:  2006-03-06
刊出日期:  2006-05-31

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