地质学报2013，Vol.87Issue(1)：29-37,9.
南天山南缘下二叠统小提坎立克组英安岩的地球化学和同位素地质年代学特征
Geochemistry and Isotopic Geochronology of Dacites from the Lower Permian Xiaotikanlike Formation in the Southern Margin of South Tianshan,and Its Tectonic Significances
摘要
Abstract
Along the southern margin of South Tianshan occurs a 300-km-long EW-trending volcanic rock belt consisting of mafic, intermediate and acidic rocks of the lower Permian Xiaotikanlike Formation. Dacites outcropping near the Tiereke hot spring are characterized by calc-lkaline (8=1. 37～ 1. 69) and metaluminous-peraluminous (A/CNK = 0. 89-1. 36) , enrichment in LREE (La/Yb=10. 45～12. 77) and elements such as Th, Hf, Zr, Tb, Gd, Rb,U, and depletion in elements such as P, Ti ,Nb, Ta, Sr and Ba. They have a medium negative Eu anomaly (δEu = 0. 57 ～0. 62), with εNd(288 Ma) = -6. 77, εSr(288 Ma) = 117. 78, TDM=1. 47 Ga. U-Pb LA-ICP-MS dating on zircon yields a weighted 206pb/238U age of 288. 4 + 3. 0 Ma (MSWD = 2. 7). Combined with regional geological data, the dacites are likely the result of partial melting of mid-lower crust in the Tianshan orogenic belt, and formed in an post-collsional extension settings in early Permian.关键词
南天山南缘/早二叠世/小提坎立克组/英安岩/地球化学/同位素地质年代学Key words
southern margin of South Tianshan/ Early Permian/ Xiaotikanlike Formation/ dacite/ geochemistry/ isotopic geochronology引用本文复制引用
罗金海,车自成,周宁超,杨巍,宋红霞,侯笑晋,韩奎..南天山南缘下二叠统小提坎立克组英安岩的地球化学和同位素地质年代学特征[J].地质学报,2013,87(1):29-37,9.基金项目
本文为国家自然科学基金项目(项目批准号:40972141)资助的成果. （项目批准号:40972141）
