| 西昆仑造山带中巴公路段石榴角闪岩形成的变质地质过程 |
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| 关键词:garnet amphibolite fluids volatiles component activity |
| 基金项目:国土资源部科技项目(编号992022) |
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| The Metamorphic Process in the Formation of Garnet Amphibolite along the China-Pakistan Highway Profile, West Kunlun Orogenic Belt |
| Garnet amphibolite, comprising garnet-bearing biotite-amphibole schist,epidote-amphibole schist and plagioclase amphibolite, are present along the China-Pakistan highway section along the western Kunlun Mountains. The medium-grade garnet amphibolites are interleaved with the low-grade biotie-epidote-chlorite schist on both megascale and microscale. Combined with the observation of rock associations and deformation features in the field and the analysis of mineral textures, metamorphic assemblages and reaction relations, the authors have deduced that the formation of the high amphibolite facies garnet amphibolite is related to local superposition upon the relatively low grade metamorphism, and this is most prominent in the central part of the shear zone. Fluid volatiles were involved in the presence of the garnet-amphibole-plagioclase assemblage. When the components became more mobile, the clinopyroxene-scapolite-plagioclase assemblage instead of garnet will occur. As to the activity of the components, the mafic component is more active than the felsic component. The protoliths of the garnet amphibolite can be either basic magmatic rocks, such as basalt and gabbro, or sedimentary rocks, like greywacke. |
| REN Liu-dong,CHEN Bing-wei.2003.The Metamorphic Process in the Formation of Garnet Amphibolite along the China-Pakistan Highway Profile, West Kunlun Orogenic Belt[J].Acta Geoscientica Sinica,24(3):219-224. |
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