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沉积学报  2015 

川北南江地区下三叠统飞一段风暴沉积特征及地质意义

DOI: 10.14027/j.cnki.cjxb.2015.05.006, PP. 899-908

Keywords: 四川盆地南江,下三叠统,风暴沉积,地质意义

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Abstract:

为进一步探究四川盆地北部南江剖面近P-T界线处频繁出露的风暴沉积暗含的地质信息,探讨早三叠世巨型季风气候对四川盆地北部沉积的影响,对研究剖面进行野外及镜下岩石学、沉积学特征综合分析,以底面侵蚀构造、风暴砾屑层、丘状交错层理等作为重要的识别标志,识别出风暴作用不同阶段的沉积产物高峰期(Sa)、衰减期(Sb)、停息期(Sc)段。根据Sa、Sb、Sc段的不同组合形式,将出露的多套风暴沉积划分为代表不同水深环境的I、II、III、IV四种风暴层序结构类型;在此基础上对Sa段风暴颗粒进行粒度分析并对风暴沉积厚度、层序结构类型等作纵向比较,风暴沉积表现为向上风暴作用逐渐增强的沉积序列。结合上寺剖面风暴沉积研究并进行横向对比,发现两剖面风暴沉积均发育在靠近P-T界线的早三叠世地层中且沉积规模接近,推测应为早三叠世时期同一巨型季风体制下受到频繁风暴作用影响的事件性沉积,并共同揭示了开江-梁平海槽边缘在早三叠世逐渐向广海方向推进、海槽逐渐被填平的沉积过程。

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