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地质学报  2010 

青藏高原东缘哀牢山金沙江构造带糜棱状花岗岩的LAICPMSUPb定年及其构造意义

, PP. 357-369

Keywords: Highgrademetamorphicbelt,mylonitizedgranite,zirconLAICPMSUPbdating,AilaoshanJinshajiangtectoniczone

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Abstract:

哀牢山―金沙江构造带糜棱状花岗岩位于哀牢山深变质带中部。锆石LAICPMSUPb定年结果显示两个样品(08Q222和08Q215)锆石新生边的年龄分别为250.2±2.1Ma(MSWD=2.5)和247.2±2.3Ma(MSWD=0.15)。石英C轴组构测定(EBSD)结果表明韧性变形变质作用形成于角闪岩相条件(500~630℃),远低于锆石结晶温度(675~864℃)和UPb体系的封闭温度(>800℃),对锆石内部的UThPb组成不会产生影响,结合锆石的阴极发光图像及UPb协和图的特点分析认为锆石LAICPMSUPb定年结果(247~250Ma)是对岩浆侵位时代的体现。花岗岩中白云母等过铝质矿物的出现、低钠高钾、A/CNK和A/NK都>1.0、稀土和微量元素配分模式与上地壳相似,以及大离子亲石元素和亲岩浆元素强烈富集,Sm和Y明显亏损的特征展示出过铝质、S型花岗岩的地球化学性质。(Yb+Ta)Rb、NbY、(Y+Nb)Rb和CaO(TFeO+MgO)构造环境判别图解及构造带曾经历早中生代俯冲碰撞作用的历史,表明该花岗岩体形成于俯冲碰撞型构造环境。结合前人在哀牢山、点苍山深变质带中相继发现的早三叠世糜棱岩化花岗岩,以及长英质岩石韧性变形变质作用发生于中下地壳(10~15km以下)的特点,分析认为哀牢山―金沙江深变质带是早三叠世及其以前的岩石被俯冲到中下地壳发生韧性变形变质后被挤出或隆升到上地壳的,深变质变形作用形成于中生代或新生代,而非元古宙,以及它不是,或至少不完全是扬子地块的结晶基底。

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