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首页> 外文期刊>Journal of Asian earth sciences >Rheological transitions in progressive melting of rock and their geological constraints from the Fuhu metatexite-diatexite profile in Guangdong Province, SE China
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Rheological transitions in progressive melting of rock and their geological constraints from the Fuhu metatexite-diatexite profile in Guangdong Province, SE China

机译：中国广东省抚湖变质岩-辉绿岩剖面中岩石逐步熔融的流变转变及其地质约束

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摘要

Integration of the published experimental data of partially melted amphibolite, orthogneiss, granite and aplite reveals the existence of three rapid strength drops of the rock-assemblage at melt fraction around 7%, 21% and 41% respectively. The first and the last drops are equivalent to the well-known 'melt connectivity transition' (MCT) and 'solid to liquid transition' (SLT). The drop at melt fraction around 21% is newly identified and termed as the 'framework-melting transition' (FMT). The FMT is defined as the transition from eutectic quartz-feldspars melting to refractory biotite melting. The three rheological transitions are well constrained by the geological data from the Fuhu profile in Guangdong Province, SE China. This profile is a 15 m high cliff. Rocks exposed on the profile are zoned as mottled, stripped, narrow-banded and wide-banded migmatites and diatexitic granite from the top of the profile downwards. The leucosome proportions of the zones measured on the outcrops combined with the experimental data of the partially melted rocks have significant implications for understanding the role of rheological transitions during crustal melting.
机译：对已发表的部分熔化的角闪石，正长片岩，花岗岩和珍珠岩的实验数据进行整合，发现岩石组合存在三个快速强度下降点，其熔体分数分别约为7％，21％和41％。第一滴和最后一滴等同于众所周知的“熔融连接转变”（MCT）和“固-液转变”（SLT）。新近确定了熔融分数下降约21％，并将其称为“框架熔融转变”（FMT）。 FMT被定义为从共晶石英-长石熔化到难熔黑云母熔化的过渡。来自中国东南部广东省抚湖剖面的地质数据很好地限制了这三个流变转变。该剖面为15 m高的悬崖。从剖面顶部向下分布，分布在剖面上的岩石被划分为斑驳，剥离，窄带和宽带的辉锰矿和重金属花岗岩。在露头上测得的区域的无色部分与部分熔融岩石的实验数据相结合，对于理解地壳熔融过程中流变转变的作用具有重要意义。

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