Deformation mechanisms and rheology: why marble is weaker than quartzite
Deformation mechanisms and rheology: why marble is weaker than quartzite
复制标题
变形机制和流变学：为什么大理石比石英岩弱
DOI：
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发表时间：
2000
影响因子：
2.7
通讯作者：
E. Rutter
中科院分区：
文献类型：
--
作者：
K. Brodie;E. Rutter
当在自然界中一起变形时，方解石岩总是比石英岩看起来更弱，更具韧性。只有考虑到方解石岩石中的粒度敏感(GSS)流动，这才能与实验流动数据相吻合，预计这种流动即使在中等变质级别的粒度为1 mm的数量级上也会占主导地位。利用新的实验数据证明了石英岩的晶内塑性流动与GSS流动之间的转变，我们预测自然界中石英的GSS流动需要在700℃或更高的温度下异常小的颗粒尺寸。因此，石英岩的自然流动预计会通过晶体内的塑性过程发生，即使在重结晶到细小的颗粒尺寸之后也是如此。
When deformed together in nature, calcite rocks invariably appear weaker and more ductile than quartz rocks. This can be reconciled with experimental flow data only by taking into account grain-size-sensitive (GSS) flow in calcite rocks, which is predicted to dominate even at grain sizes on the order of 1mm at middle metamorphic grades. Using new experimental data that demonstrate the transition between intracrystalline plastic and GSS flow of quartz rocks, we predict that unnaturally small grain sizes at temperatures of 700°C or higher are required for GSS flow of quartz in nature. Thus natural flow of quartzite is expected to occur by intracrystalline plastic processes, even after recrystallization to a fine grain size.