SANDSTONE GRAIN SIZE ANALYSIS OF UPPER TRIASSIC ERQIAO FORMATION IN ZHONGPING AREA, GUIZHOU PROVINCE: Implication of Sedimentary Environment
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摘要:
通过对贵州中坪地区上三叠统二桥组16件砂岩样品进行粒度分析，结合二桥组砂岩地层所在的区域地质背景，研究砂岩形成时的沉积环境及水动力情况.对砂岩的粒度概率累计曲线、C-M图、粒度特征参数、结构参数散点图解等的分析显示，二桥组砂岩粒度概率累积曲线图具有较好的正态分布特征，频率直方图多呈单峰式；正态概率累计曲线主要为多跳一悬式、一跳一悬式、一跳一悬夹过渡式，主要由悬浮组分和跳跃组分组成，缺少滚动组分.中坪地区上三叠统二桥组从下部到上部处于一个由三角洲平原及前缘相向浅湖相过渡的沉积环境.
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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Key words:
- Upper Triassic /
- Erqiao Formation /
- grain size analysis /
- sedimentary environment /
- Guizhou Province
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表 1 贵州中坪地区上三叠统二桥组砂岩矿物成分统计表
Table 1. Mineral compositions in the sandstone from Upper Triassic Erqiao Formation in Zhongping area, Guizhou Province
序号 样品号 岩性 Qm Qp Q F Lv Ls L Lt 1 PM116-b1 细中粒岩屑石英砂岩 64 8 72 4 - 6 6 8 2 PM116-b3 中粒石英砂岩 85 3 88 3 - - - 3 3 PM116-b4 细中粒岩屑石英砂岩 70 8 78 3 7 7 15 4 PM116-b5 硅质胶结中粒石英砂岩 76 13 89 - 1 - 1 14 5 PM116-b6 硅质胶结含砾不等粒石英砂岩 52 38 90 - - - - 38 6 PM116-b8 硅质胶结中细粒岩屑石英砂岩 77 8 85 - - 5 5 13 7 PM211-b1 硅质胶结中粒岩屑石英砂岩 76 6 82 2 - 5 5 11 8 PM211-b3 细粒岩屑石英砂岩 75 5 80 3 - 7 7 12 9 PM211-b4 细粒岩屑石英砂岩 75 3 78 4 - 8 8 11 10 PM211-b5 硅质胶结细粒岩屑石英砂岩 68 15 83 1 - 5 5 20 11 PM211-b8 中细粒岩屑石英砂岩 70 3 73 5 - 12 12 15 12 PM211-b9 细粒岩屑砂岩 54 7 61 6 - 23 23 30 13 PM211-b10 细粒岩屑石英砂岩 66 4 70 4 - 15 15 19 14 PM211-b11 细粒岩屑石英砂岩 70 3 73 4 1 10 10 13 15 PM211-b13 细中粒长石岩屑砂岩 65 3 68 7 - 13 13 16 16 PM211-b14 中细粒岩屑砂岩 62 3 65 4 - 18 18 21 注：Q—总石英质颗粒；Qm—单晶石英颗粒；Qp—多晶石英质岩屑（燧石等）；F—总长石颗粒；L—总非稳定隐晶岩屑；Lv—火山、半深成、变质火山岩屑；Ls—沉积和变质沉积岩屑；Lt—多晶质岩屑颗粒（L+Qp）. 
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表 2 贵州中坪地区上三叠统二桥组砂岩粒度分析统计表
Table 2. Sandstone grain size analysis of the Upper Triassic Erqiao Formation in Zhongping area, Guizhou Province
序号 样品号 岩性 砾石 巨砂 粗砂 中砂 细砂 极细砂 粗粉砂 细粉砂 黏土 Φ≤-1 -1＜Φ≤0 0＜Φ≤1 1＜Φ≤2 2＜Φ≤3 3＜Φ≤4 4＜Φ≤5 5＜Φ≤8 Φ > 8 1 PM116-b1 细中粒岩屑石英砂岩 0.00% 0.00% 0.00% 46.94% 43.60% 6.31% 0.14% 0.01% 3.00% 2 PM116-b3 中粒石英砂岩 0.00% 0.00% 0.00% 56.45% 29.91% 2.60% 0.04% 0.00% 11.00% 3 PM116-b4 细中粒岩屑石英砂岩 0.00% 0.00% 0.00% 54.41% 39.09% 1.51% 0.00% 0.00% 5.00% 4 PM116-b5 硅质胶结中粒石英砂岩 0.00% 0.00% 44.04% 52.66% 1.28% 0.02% 0.00% 0.00% 2.00% 5 PM116-b6 硅质胶结含砾不等粒石英砂岩 4.95% 24.60% 53.66% 12.04% 1.72% 0.04% 0.00% 0.00% 3.00% 6 PM116-b8 硅质胶结中细粒岩屑石英砂岩 0.00% 0.00% 0.00% 17.59% 68.52% 11.50% 0.39% 0.00% 2.00% 7 PM211-b1 硅质胶结中粒岩屑石英砂岩 0.00% 0.00% 18.12% 64.25% 15.78% 0.84% 0.01% 0.00% 1.00% 8 PM211-b3 细粒岩屑石英砂岩 0.00% 0.00% 0.00% 27.59% 55.95% 13.13% 0.32% 0.01% 3.00% 9 PM211-b4 细粒岩屑石英砂岩 0.00% 0.00% 0.00% 15.90% 59.01% 17.70% 0.38% 0.01% 7.00% 10 PM211-b5 硅质胶结细粒岩屑石英砂岩 0.00% 0.00% 0.00% 9.04% 62.25% 23.94% 0.76% 0.01% 4.00% 11 PM211-b8 中细粒岩屑石英砂岩 0.00% 0.00% 0.00% 2.54% 69.68% 23.38% 0.40% 0.00% 4.00% 12 PM211-b9 细粒岩屑砂岩 0.00% 0.00% 0.00% 54.15% 40.85% 0.97% 0.03% 0.00% 4.00% 13 PM211-b10 细粒岩屑石英砂岩 0.00% 0.00% 0.00% 6.37% 60.25% 27.45% 0.93% 0.00% 5.00% 14 PM211-b11 细粒岩屑石英砂岩 0.00% 0.00% 0.00% 4.46% 69.51% 22.86% 0.17% 0.01% 3.00% 15 PM211-b13 细中粒长石岩屑砂岩 0.00% 0.00% 0.00% 49.72% 42.73% 2.53% 0.01% 0.00% 5.00% 16 PM211-b14 中细粒岩屑砂岩 0.00% 0.00% 0.00% 6.45% 49.39% 34.27% 2.86% 0.03% 7.00%
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表 3 贵州中坪地区上三叠统二桥组砂岩粒度参数表
Table 3. Sandstone grain size parameters of the Upper Triassic Erqiao Formation in Zhongping area, Guizhou Province
序号 样品号 岩性 Mz σ Sk Kg Y1 Y2 Y3 1 PM116-b1 细中粒岩屑石英砂岩 2.07 0.63 0.17 1.07 -3.64547616 8.1412173 80.06498679 2 PM116-b3 中粒石英砂岩 2.07 1.51 0.60 3.67 -22.0201246 24.0381537 211.5944169 3 PM116-b4 细中粒岩屑石英砂岩 1.97 0.62 0.24 1.62 -3.88118016 11.4563438 78.94578004 4 PM116-b5 硅质胶结中粒石英砂岩 1.08 0.43 0.12 1.07 -1.83740736 7.1757583 49.73243659 5 PM116-b6 硅质胶结含砾不等粒石英砂岩 0.30 0.82 0.11 1.30 -6.24421536 7.5665248 69.37489984 6 PM116-b8 硅质胶结中细粒岩屑石英砂岩 2.43 0.52 0.16 1.10 -2.39106656 8.5433958 77.20693864 7 PM211-b1 硅质胶结中粒岩屑石英砂岩 1.49 0.55 0.16 1.02 -2.942486 7.4288335 64.60200475 8 PM211-b3 细粒岩屑石英砂岩 2.37 0.62 0.18 1.00 -3.50339216 8.0595378 84.12071404 9 PM211-b4 细粒岩屑石英砂岩 2.61 1.35 0.37 3.78 -16.75133 23.6459675 185.8141358 10 PM211-b5 硅质胶结细粒岩屑石英砂岩 2.71 0.60 0.13 1.15 -2.942098 8.771976 86.934213 11 PM211-b8 中细粒岩屑石英砂岩 2.74 0.52 0.22 1.11 -2.59576456 9.2239198 83.14591864 12 PM211-b9 细粒岩屑砂岩 2.00 0.43 0.26 1.28 -2.24994936 9.8935133 66.66855859 13 PM211-b10 细粒岩屑石英砂岩 2.78 1.20 0.41 3.37 -13.588138 22.022051 164.065767 14 PM211-b11 细粒岩屑石英砂岩 2.72 0.48 0.07 1.07 -1.52116056 8.0040718 77.48842164 15 PM211-b13 细中粒长石岩屑砂岩 2.05 1.28 0.47 3.70 -15.8013698 23.5659238 166.7618964 16 PM211-b14 中细粒岩屑砂岩 2.91 1.37 0.40 2.83 -17.3319842 19.0143953 194.6279438
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