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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Rb-Sr microchrons of synkinematic mica in mylonites: an example from the DAV fault of the Eastern Alps
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Rb-Sr microchrons of synkinematic mica in mylonites: an example from the DAV fault of the Eastern Alps

机译：斑岩运动云母中的Rb-Sr微时空：以东阿尔卑斯山的DAV断层为例

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摘要

A technique for texturally controlled microsampling from rock thick sections and subsequent Rb-Sr dating of μg-sized samples has been developed. It allows direct dating of minerals unequivocally related to deformation. The technique has been applied to strictly synkinematically grown white mica prepared from mylonites related to the Defereggen-Antholz-Vals (DAV) fault south of the Tauern window (Eastern Alps). Control of deformation ages is provided by field relationships with independently dated plutons and dykes dated here by single mineral Rb-Sr. The field observations and isotopic ages are fully consistent and demonstrate that this is a reliable method for sub-mm-scale geochronology. The ages obtained establish that sinistral strike slip shearing associated with the DAV fault lasted from at least 33 Ma to 30 Ma, followed by an abrupt change to dextral transpression related to the adjacent Periadriatic fault.
机译：已经开发了一种用于从岩石厚部分进行纹理控制的微采样以及随后对微克大小的样品进行Rb-Sr测年的技术。它允许对与变形毫无关系的矿物进行直接定年。该技术已应用于严格的运动学生长的白云母，该白云母是由与陶恩窗（东阿尔卑斯山）以南的Defereggen-Antholz-Vals（DAV）断层有关的my石制备的。变形年龄的控制是通过田间关系来实现的，这里的田间关系具有单独标明日期的lut和堤，此处标明的是单个矿物Rb-Sr。实地观测和同位素年龄是完全一致的，表明这是亚毫米尺度年代学的可靠方法。获得的年龄证明与DAV断层有关的左旋走滑剪切至少持续了33 Ma至30 Ma，随后与相邻的Periadriatic断层有关的右旋转导突然改变。

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