| 司海瀛,王甘露,牟雨亮.贵州凤冈－湄潭地区二叠系栖霞组沉积相研究[J].贵州地质,2018,35(3):181-187 |
| 贵州凤冈－湄潭地区二叠系栖霞组沉积相研究 |
| Study of Sedimentary Facies of Qixia Formation, Permian in Fenggang-Meitan Area of Guizhou |
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| DOI： |
| 中文关键词: 沉积相 栖霞组 二叠系 凤冈县 湄潭县 贵州 |
| 英文关键词:Sedimentary facies Qixia formation Permian Fenggang county Meitan county Guizhou |
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| 中文摘要: |
| 贵州凤冈－湄潭地区二叠系栖霞组碳酸盐岩出露良好、层序完整、沉积现象丰富，为研究沉积相提供了良好的场所。本文通过凤冈－湄潭地区中二叠统栖霞组野外剖面测制、样品采集及室内测试鉴定等手段，对栖霞组岩石类型、沉积结构构造、古生物、地球化学、测井曲线等多种相标志及其沉积环境意义进行了系统研究。通过研究，认为栖霞组处于局限浅海台地碳酸盐岩沉积体系，整体处于水深数米到数十米浪基面之下，水动力条件较弱，海水欠流畅，海底贫氧或缺氧，盐度多高于正常海水的盐度。部分时段水体更深，水体环境更为闭塞、贫氧，水动力条件更低。根据水体深度和水动力条件等的物质表现，又分为潮下、台内洼地和台内滩3个亚相，以及生物碎屑滩、深水泥、静水泥3个微相。 |
| 英文摘要: |
| The carbonate rock of Qixia formation, Permian in Fenggang-Meitan area are well exposed, have complete sequences and abundant sedimentary phenomena, it’s suitable for sedimentary facies study. By field measurement, sample collection, indoor test and identification and other method, the rock type, sedimentary structure, paleontology, geochmistry, logging curve and its sedimentary significance are studied. It’s thought that Qixia formation is located in a shallow carbonate sedimentary system in the shallow-sea platform which below the surface wave several meters to several ten meters deep, the hydrodynamic condition is relatively weak, the seawater is fluent, oxygen is poor or deficient in the seabed, the salinity is higher than normal seawater. In some periods, the water body is deeper, the water environment is more occluded and oxygen-poor, the hydrodynamic condition is lower. According to the water depth, hydrodynamic condition and other material performance, it’s divided into 3 subfacies: subtidal, depression, beach and 3 microfacies: bioclastic beach, deep cement and static cement. |
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