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Determining P-T paths from garnet zoning using a brute-force computational method

机译:使用蛮力计算方法从石榴石分区确定P-T路径

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Reconstructing metamorphic pressure-temperature (P-T) paths through petrographic textures, mineral assemblages, and compositions is fundamental to the understanding of orogenesis. We present a new method to derive the P-T path of a rock from mineral zoning. Using Perpleji (Connolly in Earth Planet Sci Lett 236(1-2):524-541, 2005) and a Matlab script, we forward model garnet zoning, parageneses, and mineral modes for an arbitrary set of possible P-T paths, and then compare the calculated results to mineral modes, textures, and zoning preserved in rocks. The best-fit P-T path is determined by comparing the calculated zoning to the measured zoning using the sum of squares. The results indicate that combining Mg#, Ca, and Mn zoning in garnet with mineral modes can yield precise constraints on the P-T path of a rock.
机译:通过岩相纹理,矿物组合和成分重建变质压力-温度(P-T)路径是理解造山作用的基础。我们提出了一种从矿物分区推导岩石的P-T路径的新方法。使用Perpleji(Connolly in Earth Planet Sci Lett 236(1-2):524-541,2005)和Matlab脚本,我们针对任意可能的PT路径集转发了石榴石分区,共生和矿物模式的模型,然后进行了比较计算结果可以保存在岩石中的矿物模式,质地和分区。通过使用平方和将计算出的分区与测量的分区进行比较,可以确定最佳拟合的P-T路径。结果表明,将石榴石中的Mg#,Ca和Mn分区与矿物模式结合可以对岩石的P-T路径产生精确的约束。

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