Geochemical characters and tectonic significance of Late Paleozoic granitoids from Tekesi Daban, Western Tianshan.
Geochemical characters and tectonic significance of Late Paleozoic granitoids from Tekesi Daban, Western Tianshan.
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发表时间：
2009
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通讯作者：
Yang Jun-quan;Li Yong-jun;Zhang Su-rong;Si Guo-hui;Zhang Hong-rui;Luan Xin-dong
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作者：
Yang Jun-quan;Li Yong-jun;Zhang Su-rong;Si Guo-hui;Zhang Hong-rui;Luan Xin-dong
特克斯达坂花岗岩可划分为早石炭世库勒萨依岩系（347 Ma）和早二叠世奇纳尔萨依岩系（291- 292 Ma）两个岩系，通过对花岗岩地球化学特征的研究，发现两个岩系在岩石地球化学特征上存在一定的差异：库勒萨依层序特征为A/ CNK=1，K2 O/Na 2 O =0.96，（Na 2 O + K2 O）/Al 2 O3平均值为0.66，σ=3.2，而奇纳尔萨依序列平均值为A/CNK=1.05，K2 O/Na 2 O =1.17，前者富含Na 2 O，库勒萨依岩系为偏铝质岩石，与后者（过铝质花岗岩类）不同，库勒萨依岩系形成于岛弧构造环境，属于钙碱性岩型，而奇纳尔萨依岩系形成于后造山期，属于碱性岩型。
Granitoids of Tekesi Daban have been subdivided into two successions of the Kulesayi succession with age of 347Ma in the early Carboniferous period and the Qinaersayi succession with age of 291-292Ma in the early Permian period.By the research of geochemical features for the granitoids in this paper,some differences can be observed: the Kulesayi succession is characterized by A/ CNK=1,K2O/Na2O=0.96,(Na2O+K2O)/Al2O3=0.66 and σ=3.2 on the average,whereas the Qinaersayi succession is characterized by A/CNK=1.05 and K2O/Na2O=1.17 on the average.The former is rich in Na2O,the latter is rich in K2O relatively.The Kulesayi succession is metaluminous rocks which is different of the latter(peraluminous granitoids).The Kulesayi succession which belongs to the calc-alkalic rock type is formed in the island arc tectonic setting and the Qinaersayi succession which belongs to the alkalic rock type is formed in post-orogenic episode.