The Formation of Carbonate Breccia in Shulu Depression

Key words: 
• carbonate /
• breccia /
• debris flow /
• formation /
• Shulu depression /
•  /

Abstract: Breccia in Shulu depression was found in the middle and low of the third segment of Shahejie Formation, it is a breccia with carbonate fragment as its main constituent, and distributes skirt-shapely on slopes in the depression. Breccia and marlstone with breccia are familiar breccias in the area and the former is domestic. Grain and matrix in the breccia are mainly angular and subangular carbonate clastic particles, whose parent rock were carbonate stratum of Ordovician. Mainly grain support, massive structure, infrequent graded bedding and others bedding, un-sorting of detrital grains and thicker breccia layer are important features of carbonate breccia in Shulu depression. Characteristics of component, fabric, structure and geologic background all reveal that the breccia in the study area is inviscous debris flow sediment of terrestrial formation. 