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首页> 外文期刊>Contributions to Mineralogy and Petrology >An Early Cretaceous garnet pressure-temperature path recording synconvergent burial and exhumation from the hinterland of the Sevier orogenic belt, Albion Mountains, Idaho
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An Early Cretaceous garnet pressure-temperature path recording synconvergent burial and exhumation from the hinterland of the Sevier orogenic belt, Albion Mountains, Idaho

机译：早白垩纪石榴石压力-温度路径记录爱达荷州阿尔比恩山脉塞维尔造山带腹地的共生性埋葬和掘尸

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摘要

Rocks may undergo complex pressure-temperature (P-T) histories during orogenesis in response to alternating episodes of synconvergent burial and exhumation. In this study, chemical zoning in garnets combined with textural and chemical evidence from the schist of Willow Creek in the Albion Mountains of south-central Idaho (USA), reveals a complex P-T path during the early stages of Sevier orogenesis. The distribution of quartz inclusions combined with internal resorption features establishes a hiatus in garnet growth. Chemical zoning was simulated using a G-minimization approach to yield a P-T path consisting of three distinct pressure changes during increasing temperature, defining an "N" shape. Lu-Hf isochron ages from multiple garnet fractions and whole-rock analyses in two samples are 132.1 +/- 2.4 and 138.7 +/- 3.5 Ma. The samples were collected from the hanging wall of the Basin-Elba thrust fault and yielded results similar to those previously obtained from the footwall. This leads to several conclusions: (1) Both the hanging wall and footwall experienced the same metamorphic event, (2) the paths document a previously unrecognized crustal thickening and synorogenic extension cycle that fills an important time gap in the shortening history of the Sevier retroarc, suggesting progressive eastward growth of the orogen rather than a two-stage history, and (3) episodes of extensional exhumation during protracted convergent orogenesis are increasingly well recognized and highlight the dynamic behavior of orogenic belts.
机译：岩石在造山过程中可能经历复杂的压力-温度（P-T）历史，以响应共生埋葬和掘尸交替发生。在这项研究中，石榴石的化学分区以及来自爱达荷州中南部（美国）艾比奥山（美国）的柳溪片岩的纹理和化学证据，揭示了塞维尔造山运动早期的复杂P-T路径。石英夹杂物的分布与内部吸收特征相结合，使石榴石生长中断。使用G最小化方法对化学分区进行了模拟，以产生P-T路径，该路径由温度升高期间的三个不同压力变化组成，并定义为“ N”形。来自多个石榴石部分的Lu-Hf等时年龄和两个样品的全岩石分析分别为132.1 +/- 2.4 Ma和138.7 +/- 3.5 Ma。从盆地-厄尔巴冲断层的上盘收集样品，得到的结果与以前从下盘获得的结果相似。这导致了几个结论：（1）上盘和下盘都经历了相同的变质事件，（2）路径记录了以前无法识别的地壳增厚和增生作用的扩展周期，填补了塞维尔逆流的缩短历史中的重要时间空白。 ，表明造山带逐渐向东生长，而不是两段历史，（3）延长的聚变造山过程中的发掘性发烧逐渐得到人们的认可，并突出了造山带的动态行为。

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