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首页> 外文会议>Workshop on Alpine Geological Studies >Tracing the exhumation of the Eclogite Zone (Tauern Window, Eastern Alps) by ~(40)Ar/~(39)Ar dating of white mica in eclogites
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Tracing the exhumation of the Eclogite Zone (Tauern Window, Eastern Alps) by ~(40)Ar/~(39)Ar dating of white mica in eclogites

机译：追踪eClogite区（Tauern窗口，东阿尔卑斯山）的埃及〜（40）ar /〜（39）在eClogites中的白色云母的约会

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New radiometric ages from the Subpenninic nappes (Eclogite Zone and Rote Wand – Modereck Nappe,Tauern Window) show that phengites formed under logite-facies metamorphic conditions retain their initial isotopic signature, yen when associated lithologies were overprinted by greenschist- to amphibte-facies metamorphism. Different stages of the eclogite-facies evolution be dated provided ~(40)Ar/~(39)Ar dating is combined with micro-structural nalyses. An age of 39 Ma from the Rote Wand – Modereck Nappe is intereted to be close to the burial age of this unit. Eclogite deformation within e Eclogite Zone started at the pressure peak along distinct shear zones, and evailed along the exhumation path. An age of ca. 38 Ma is only observed r eclogites not affected by subsequent deformation and is interpreted as maximum age due to the possible influence of homogenously distributed excess argon. During exhumation deformation was localised along distinct mylonitic shear zones. This stage is mainly characterised by the formation of dynamically recrystallized omphacite2 and phengite. Deformation resulted in the resetting of the Ar isotopic system within the recrystallized white mica. Flat argon release spectra showing ages of 32 Ma within mylonites record the timing of cooling along the exhumation path, and the emplacement onto the Venediger Nappe. Ar-release patterns and ~(36)Ar/~(40)Ar vs. ~(39)Ar/~(40)Ar isotope correlation analyses indicate no significant ~(40)Ar-loss after initial closure, and only a negligible incorporation of excess argon. From the pressure peak onwards, eclogitic conditions prevailed for almost 8-10 Ma.
机译：来自亚峰内Nappes（eClogite区和死亡魔杖 - Modereck Nappe，Tauern Window）的新辐射仪表表明，在井地相变质条件下形成的峰值保留了它们的初始同位素签名，当相关的岩性被Greenschist-to Amphibte相变质叠印时，日元。提供的Eclogite面部进化的不同阶段进行，提供〜（40）AR /〜（39）AR约会与微结构NALYSES相结合。从死头魔杖的年龄为39 mA - Modereck Nappe被禁止接近本机的葬礼。 E Eclogite区域内的eGlogite变形在沿着不同的剪切区域的压力峰值开始，并沿散发路径逸出。加利福尼亚州。仅观察到r eClogites不受随后变形的影响，并且由于均匀分布过量氩气可能的影响，被解释为最大年龄。在抛出过程中，变形沿着不同的髓鞘区局部地定位。该阶段主要是通过形成动态再结晶的Omphacite2和Phengite的特征。变形导致重结晶的白色云母内的Ar同位素系统的复位。髓鞘中显示32 mA的扁平氩释放光谱记录了沿呼口路径冷却的时序，并将施加到Venediger Nappe上。 Ar释放图案和〜（36）Ar /〜（40）Ar与〜（39）Ar /〜（40）Ar同位素相关分析表明初始关闭后没有显着〜（40）ar损失，并且只有可忽略不计纳入多余的氩气。从压力峰值开始，果蝇条件普遍存在近8-10 mA。

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