FEATURES AND TECTONIC SIGNIFICANCE OF THE MOTTLED STRUCTURE IN THE DABEIWU AREA, JIANGXI PROVINCE
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摘要: 大背坞地区的斑点构造分为同生碎屑和变斑晶两大类共７种。详细论述了各种斑点的分布和变形特征。认为同生碎屑为浊流沉积成因，分布受地层控制；同构造变斑晶受韧性剪切带控制，是浅变质碎屑岩中进变质韧性剪切带的重要标志之一。通过对斑点构造进行应变测量，重新厘定了区内的韧性剪切带，估算了褶皱变形压缩率和大背坞韧性剪切带的压缩量、剪切位移，认为本区主要经历区域褶皱和韧性剪切两期变形。Abstract: The mottled structure in the Dabeiwu area can be classified into syngenetic fragments and porphyroblasts, including seven types. On the basis of a study of the distribution and deformation features of the mottled structure, the authors draw the following conclusions: syngenetic fragments are of turbidite origin; syngenetic porphyroblasts are subjected to the control of the ductile shear zone and are one of the important marks of the ductile shear zone in lowgrade metamorphic clastic rocks. According to strain measurements of the mottled structure, the scale of the ductile shear zone is reoutlined and the rate of compression of regional fold deformation and compression amount and shear displacement of the Dabeiwu ductile shear zone are estimated. Finally, the authors point out that there are two stages of deformation for the regional folds and ductile shear in the area.
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Keywords:
- mottled structure /
- syngenetic fragment /
- porphyroblast /
- Dabeiwu area
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