Characteristics and Origin of the Shadegai Pluton in the Daqingshan Area,Inner-Mongolia
Characteristics and Origin of the Shadegai Pluton in the Daqingshan Area,Inner-Mongolia
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发表时间：
2009
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通讯作者：
Wang Xing-an
中科院分区：
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作者：
Wang Xing-an
通过野外调查和详细的岩石学、矿物学、地球化学和同位素年代学研究，探讨了该区深部岩体形成的年代和构造背景。锆石U-Pb定年加权平均值为206Pb/238U表观年龄198.5 Ma，代表了沙得盖岩体的侵位年龄。该岩体位于印支逆冲推覆体的前缘挤压区。通过岩石学、矿物学、地球化学研究和构造背景分析，认为该岩体为高钾钙碱性造山后a型花岗岩。与逆冲作用相关的地壳变厚导致了岩浆的融化和侵位，形成了荫盖岩体。岩浆活动是该地区印支运动的重要组成部分。
The age and tectonic setting of the Shadegai pluton are discussed based on field investigation and the detailed petrological,mineralogical,geochemical and isotopic geo-chronological studies.Zircon U-Pb dating gives a weighted mean of 206Pb/238U apparent age of 198.5 Ma,which is interpreted to represent the emplacement age of the Shadegai pluton.The pluton was sited at the frontal compressive area of an Indosinian thrust nappe.The pluton is also concluded to be high-k calc-alkaline,post-orogenic A-type granite based on petrological,mineralogical and geochemical studies and on tectonic setting analysis.The thrusting-related thicken crust resulted in the melting and emplacement of the magmas responsible for the formation of the Shadegai pluton.Magmatic activity made up an important part of the Indosinian movement in the area.