Jinning granodiorite and diorite deeply concealed in the central Tarim Basin
Jinning granodiorite and diorite deeply concealed in the central Tarim Basin
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DOI：
10.1360/03yd0354
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
Yuezhou Li;Wenjie Song;Genyao Wu;Yifen Wang;Yuping Li;Duo-Ming Zheng
中科院分区：
文献类型：
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作者：
Yuezhou Li;Wenjie Song;Genyao Wu;Yifen Wang;Yuping Li;Duo-Ming Zheng
塔参1井位于塔里木盆地中部，井深7200米，是我国最深的一口井。井底（7169-7200 m）出露紫灰色中粒花岗闪长岩，含深灰色细粒闪长岩捕虏体，为晋宁岩浆活动的产物。两类岩石的微量元素地球化学特征和稀土元素剖面特征相似，均为钙碱性系列I型花岗岩。双辉岩的近点标志着由于俯冲作用而形成的岩浆弧。一千二百毫安花岗闪长岩形成于890-932 Ma之前。然而，还需要更多的研究来澄清弧的扩张是否代表了一个ca。300 Ma的俯冲延伸或在造山碰撞事件期间的再活化。九百毫安。
The 7200-m-deep Well Tacan 1 in the central Tarim Basin is the deepest in China. Purplish gray medium-grained granodiorite containing dark gray fine-grained diorite xenolith is revealed at the base of the well (7169–7200 m), and they are results of the Jinning magmatic activities. Trace-element geochemistry and REE profiles of both rock types are similar, indicating that they are calc-alkaline series I-type granitoid. Proxies of diorite signify the development of a magmatic arc due to subduction at ca. 1200 Ma. The granodiorite was formed before 890–932 Ma. However, more study is needed to clarify if the arc diorite represents a ca. 300 Ma extension of the subduction or a reactivation during the orogenic collision event at ca. 900 Ma.