郯庐高压走滑韧性剪切带特征及其^40Ar/^39Ar定年

朱光 谢成龙 王勇生 牛漫兰 刘国生. 郯庐高压走滑韧性剪切带特征及其^40Ar/^39Ar定年[J]. 岩石学报, 2005, 21(6): 1687-1702.
引用本文: 朱光 谢成龙 王勇生 牛漫兰 刘国生. 郯庐高压走滑韧性剪切带特征及其^40Ar/^39Ar定年[J]. 岩石学报, 2005, 21(6): 1687-1702.
ZHU Guang XIE ChengLong WANG YongSheng NIU ManLan LIU GuoSheng School of Resource and Environmental Engineering,Hefei University of Technology,Hefei 230009,China. Characteristics of the Tan-Lu high-pressure strike-slip ductile shear zone and its ^40Ar/^39Ar dating[J]. Acta Petrologica Sinica, 2005, 21(6): 1687-1702.
Citation: ZHU Guang XIE ChengLong WANG YongSheng NIU ManLan LIU GuoSheng School of Resource and Environmental Engineering,Hefei University of Technology,Hefei 230009,China. Characteristics of the Tan-Lu high-pressure strike-slip ductile shear zone and its ^40Ar/^39Ar dating[J]. Acta Petrologica Sinica, 2005, 21(6): 1687-1702.

郯庐高压走滑韧性剪切带特征及其^40Ar/^39Ar定年

  • 基金项目:

    国家自然科学基金资助项目(编号:40272094)

Characteristics of the Tan-Lu high-pressure strike-slip ductile shear zone and its ^40Ar/^39Ar dating

  • 本文首次报导苏鲁造山带西缘新发现的北东向郯庐高压左旋走滑韧性剪切带。剪切带糜棱岩中长石与石英皆广泛发生了动态重结晶,其重结晶型式指示变形温度高达600~700℃。糜棱岩基质中新结晶的白云母,经电子探针分析指示为多硅白云母,所计算的形成压力为1.03~1.45 GPa,表明形成于地壳底部的高压榴辉岩相环境。工作中对剪切带糜棱岩中6个多硅白云母样品进行了~(40)Ar/~(39)Ar测年,其中2个超糜棱岩基质中新结晶多硅白云母分别给出了209.9±1.5Ma 和214.3±1.4Ma(皆晚三叠世)的~(40)Ar/~(39)Ar 坪年龄,指示了左旋走滑的冷却年龄。这些年龄值与苏鲁超高压变质带内已有的多硅白云母~(40)Ar/~(39)Ar 年龄基本一致,表明郯庐断裂带形成于华北与华南板块的碰撞造山期。结合其它地质现象,笔者认为在这两个板块碰撞中郯庐断裂带是以陆内左旋变换断层的型式出现的,从而将大别与苏鲁造山带大规模左行错开。
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收稿日期:  2005-02-04
刊出日期:  2005-11-30

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