| 晋北娄烦吕梁群变质相带的划分及其成因研究 |
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| 关键词:progressive metamorphic belt characteristic metamorphic mineral geothermormetry rock layers with the same chemical composition the fault-type ductile shear deformation of Xichuan river |
| 基金项目:国家自然科学基金资助项目(批准号:49372102) |
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| 摘要: |
| The Study on the Designation of the Metamorphic Belts and Their Genesis in Liiliang Groups in Loufan Districts Shanxi Province |
| The original layers of metamorphic rocks of Luliang group in Loufan district Shanxi province consist of the muddy sedimentary and igneous rocks, which had undergone the two different metamorphisms, namely: the early Liiliang metamorphisms and the late fault-type ductile shear deformation metamorphisms. The former caused the northeast layer s occurrence, while the latter had the northeast layer's occurrence turned to the nearly north-south and overlapped on the former and closely linked to the formation of metamorphic belts. The author chooses the muddy sediment sensitive to T and p as the subject to study. To designate the metamorphic belts of the metamorphic rocks involved and determine the T and p of the respective metamorphic belts, EPMA and geother-mormetry are adopted in the research. The five metamorphic belts (Chlorite belt→Biotite belt→Almandine belt→ Staurolite and Kyanite belt→ Andalusite and Sillimanite belt) have been designated based on the sequences of the characteristic metamorphic minerals appearing firstly in distribution in the research area. The result shows that there exists the set of complete progressive metamorphic belts that is comparable to the famous Barrovian type in Scotland. Moreover, the metamorphic conditions in the belts are different : the North is controlled by higher pressure( p = 300-700 MPa), while the South by higher temperature( T = 600 ℃ , p < 300 MPa), both of which are attributed to the fault-type ductile shear deformation of Xichuan river. |
| LU Bao-qi,WANG Ci-yin.2003.The Study on the Designation of the Metamorphic Belts and Their Genesis in Liiliang Groups in Loufan Districts Shanxi Province[J].Acta Geoscientica Sinica,24(4):325-329. |
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