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首页> 外文期刊>Journal of Metamorphic Geology >Coupling forward modelling of garnet growth with monazite geochronology: an application to the Rappold Complex (Austroalpine crystalline basement)
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Coupling forward modelling of garnet growth with monazite geochronology: an application to the Rappold Complex (Austroalpine crystalline basement)

机译：石榴石生长与独居石年代学的正向耦合模型：在Rappold复杂岩体（奥氮平晶体基底）中的应用

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摘要

Results from forward modelling of garnet growth and U-Th-Pb chemical dating suggest three periods of metamorphism that affected metapelitic rocks of the Rappold Complex (Eastern European Alps). Garnet first grew during Barrovian-type metamorphism, possibly during the Carboniferous Variscan orogeny. The second period of metamorphism produced monazite and resulted in minor garnet growth in some samples. Variable garnet growth was controlled by changes to the effective bulk rock composition resulting from resorption of older garnet porphyroblasts. Monazite crystals have variable morphology, textures and composition, but all yield Permian ages (267 +/- 12 to 274 +/- 17 Ma). In samples in which there was Permian garnet growth, monazite forms isolated and randomly distributed grains. In other samples, monazite formed pseudomorphous clusters after allanite. This difference is attributed to higher transport rates of monazite-forming elements in samples which underwent dehydration reactions during renewed garnet growth. The third and final period of garnet growth took place during Eo-Alpine (Cretaceous) metamorphism. Garnet of this age displays a wart-like texture. This may reflect transport-limited growth, possibly as a result of repeated dehydration during polyphase metamorphism.
机译：石榴石生长和U-Th-Pb化学定年的正演模拟结果表明，三个变质期影响了拉珀德复合体（东欧阿尔卑斯山）的变质岩。石榴石最初在Barrovian型变质中生长，可能在石炭纪Variscan造山运动中生长。第二阶段的变质过程产生了独居石，并导致一些样品中的石榴石生长不大。石榴石生长的变化是由有效的块岩组成的变化所控制的，该变化是由于老石榴石成矿细胞的吸收所致。独居石晶体具有可变的形态，质地和组成，但是全部产生二叠纪年龄（267 +/- 12至274 +/- 17 Ma）。在二叠纪石榴石生长的样品中，独居石形式分离且晶粒随机分布。在其他样品中，独居石在尿石之后形成假晶簇。这种差异归因于样品中形成独居石的元素的更高的传输速率，而这些样品在石榴石重新生长期间经历了脱水反应。石榴石生长的第三个也是最后一个时期发生在Eo-Alpine（白垩纪）变质期。这个年龄的石榴石显示出类似疣的质地。这可能反映了运输受限的生长，可能是多相变质过程中反复脱水的结果。

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