SANDSTONE GRAIN SIZE ANALYSIS OF UPPER TRIASSIC ERQIAO FORMATION IN ZHONGPING AREA, GUIZHOU PROVINCE: Implication of Sedimentary Environment
WANG Ning-zu1,2, ZHANG Wen-bin2, HE Bi2, TAO Gang3, ZHAO Fei2, SUN Ping-yuan2, ZHANG Zhi-xi2, ZHAO Zhen-guan2
1. School of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China; 2. No. 2 Geology and Minerals Exploration Institute, Gansu Bureau of Geology and Mineral Exploration & Development, Lanzhou 730000, China; 3. School of Environment and Resources, Southwest University of Science and Technology, Mianyang 621010, Sichuan Province, China
Abstract：Through the grain size analysis of 16 sandstone samples from the Upper Triassic Erqiao Formation in Zhongping area of Guizhou Province, combined with the regional geological setting, the paper studies the sedimentary environment and hydrodynamic conditions during the formation of the sandstone. The analysis on the probability cumulative grain size curves, C-M diagram, grain size characteristic parameters and scatter diagram of structure parameters of the sandstone indicates that the probability cumulative grain size curves of the sandstone from Erqiao Formation show good normal distribution, and the frequency histograms mostly show single-peak curves. The normal probability cumulative curves are mainly multi-bouncing population-one suspension population, one bouncing population-one suspension population, and one bouncing population-one suspension population-transitional zone patterns, mainly composed of suspended and jumping components, but lack of rolling components. The Upper Triassic Erqiao Formation in Zhongping area from the lower to the upper part is in a sedimentary environment transitioning from delta plain and delta front facies to shallow lake facies.
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