Characteristics of Carboniferous—Permian strata and sedimentary facies in the northern margin of Bogda Mountains:a case study of the Jingjingzigou section in Urumqi,Xinjiang
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摘要:
准噶尔盆地南缘博格达地区石炭纪—二叠纪原型盆地性质与沉积演化长期以来一直存在争议。通过对博格达山北缘井井子沟剖面连续出露的石炭系与二叠系进行野外实测, 系统分析地层岩性与沉积相, 结合前人大地构造演化、火成岩岩石学与地球化学的研究成果, 探讨了该区晚古生代沉积演化与原型盆地性质转变, 对深入分析准噶尔盆地晚古生代海陆转换具有重要的指导意义。晚石炭世发育海相碳酸盐岩台地与深水浊积扇, 夹少量的枕状玄武岩。早二叠世在残留海沉积背景下发育了近岸水下扇与深水浊积扇; 中二叠世经历了由海相到湖相的演化过程, 早期乌拉泊组与井井子沟组在浅海环境下发育了辫状河三角洲, 晚期以芦草沟组半深湖—深湖相的泥页岩和碳酸盐岩发育为特征; 晚二叠世, 研究区发育了厚层的扇三角洲相的棕红色、灰绿色砂砾岩。综合分析认为, 晚石炭世博格达地区为裂谷盆地, 发育典型的双峰式火山岩与深水浊流; 早中二叠世为后碰撞陆内裂谷, 发育伸展滑塌变形构造与双峰式火山岩组合; 晚二叠世转为陆内压陷盆地, 普遍发育冲积扇或扇三角洲相, 沉积环境发生了明显的突变。
Abstract:The nature and sedimentary evolution of Carboniferous—Permian prototype basins in Bogda area, southern margin of Junggar Basin have long been controversial.Based on the field measurement of Carboniferous and Permian continuously exposed in Jingjingzigou section in the northern margin of Boghdad Mountains, the lithology and sedimentary facies of the strata are systematically analyzed.Combined with the previous research results of tectonic evolution, igneous petrology and geochemistry, the Late Paleozoic sedimentary evolution and the transformation of prototype basin properties in this area are discussed, which has a very important guiding significance for the in-depth analysis of the Late Paleozoic sea-land conversion in Junggar Basin.Marine carbonate platform and deep-water turbidite fan developed in Late Carboniferous, with a small amount of pillow basalt.In the Early Permian, nearshore subaqueous fan and deep-water turbidite fan were developed under the background of residual sea deposition.The Middle Permian experienced the evolution process from marine facies to lacustrine facies.In the early stage, braided river deltas were developed in the shallow water environment of Urapa Formation and Jingjingzigou Formation, and in the Late stage, shale and carbonate rocks in the semi-deep lake-deep lake facies of Lucaogou Formation were characterized.In the late Permian, the study area developed brown-red and gray-green glutenite of thick fan delta facies.Comprehensive analysis shows that the Bogda area in Late Carboniferous is a rift basin with typical bimodal volcanic rocks and deep water turbidity currents.The Early-Middle Permian is a post-collision intracontinental rift, which developed an extensional slump deformation structure and bimodal volcanic rock assemblage.Late Permian into intracontinental depression basin, Bogda area generally developed alluvial fan or fan delta facies, sedimentary environment occurred obvious mutation.
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Key words:
- Bogda Mountains /
- Carboniferous /
- Permian /
- sedimentary facies /
- prototype basin /
- sedimentary evolution /
- Xinjiang
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