内蒙古扎鲁特旗三叠纪黑云母二长花岗岩特征

详细信息

收稿日期: 2015-06-29

修回日期: 2015-07-14

刊出日期: 2016-02-29

CHARACTERISTICS OF THE TRIASSIC BIOTITE MONZOGRANITE IN JARUD QI, INNER MONGOLIA

Received Date: 29 June 2015

Revised Date: 14 July 2015

Publish Date: 29 February 2016

摘要: 内蒙古扎鲁特旗北部黑云母二长花岗岩岩体位于兴蒙造山带东段，形成于晚三叠世.黑云母二长花岗岩岩石地球化学表现为富SiO2、Al2O3和碱质，Na2O/K2O比值小于1，A/CNK比值介于1.021~1.084之间，轻重稀土元素分馏明显，轻稀土元素富集，具明显负铕异常.微量元素中亏损Ba、Sr、Ti、P，稀土元素中亏损Eu、Yb，具有A型花岗岩的地球化学特征.结合区域地质资料和前人相关研究，推测黑云母二长花岗岩可能形成于板块内部造山后期地壳伸展减薄的环境.
- A型花岗岩 /
- 地球化学特征 /
- 晚三叠纪 /
- 内蒙古
Abstract: The biotite monzogranite intrusive body in northern Jarud, Inner Mongolia, located in the eastern section of Daxinganling Mountains, was formed in Late Triassic Period. The rock is geochemically characterized by rich SiO2, Al2O3 and alkalis, with Na2O/K2O less than 1, A/CNK between 1.021 and 1.084. The LREE and HREE are notably fractionated, with enriched LREE. The Eu negative anomaly is obvious. The trace elements show depletion of Ba, Sr, Ti, P, Eu and Yb, with the geochemical characteristics of A-type granite. Combined with regional geological data and previous research, it is supposed that the biotite monzogranite was formed in crustal stretch thinning setting of late orogenic epoch within the plate.
- A-type granite /
- geochemical characteristics /
- Later Triassic /
- Inner Mongolia