Study on Sequence Stratigraphy of Deep Water Sediments in Youjiang Basin
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摘要: 以右江地区泥盆—三叠纪深水盆地相地层为研究对象,①详细讨论了深水浊流沉积的层序划分及特征,结果表明浊流沉积的层序界面特征明显,主要表现为界面不规则,LST期砂岩底面具大量侵蚀充填构造及塑性流动变形构造等,层序的体系域构成与浊积扇演化关系密切,即从低水位体系域→海侵体系域→高水位体系域的演化浊积扇经历了进积→退积→加积→进积演化过程;②详细讨论了深水硅泥质沉积的层序划分及特征,即可根据硅质岩、泥质岩 (包括粉砂岩 )相对含量变化及成因特征来识别层序及体系域组成特征。Abstract: Nowadays the research of sequence stratigraphy h as become a hot spot problem in geology. But, it is very difficult to use the se quence stratigraphy theory to divide the sequence of deep water basin sedimentar y layer, this is because that the lithologic-character of deep water basin sedi mentary layer is very monotonous. In study area, from Devonian Period to Triassi c P eriod the strata of the deep water basin sediments are very well developed whi ch included turbidite and siliceous-mudstone sediment. So the paper discussed i n detail the sequence characteristics of deep water basin sedimentary layer. The results showed that the sequ ence boundary surface characteristic of turbidite sediments was obvious,which di splayd that the surface was irregular and the bottom of LST sandstones developed many different erosion surface, etc, and the sequence evolution of t urbidite was related to the turbidite fan's evolution. The sequence division of s iliceous-mudstone sediment can be identified through the analyses of content pr oportion and origin of mudstone.
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Key words:
- deep-water basin /
- turbidite /
- siliceous-mud stone /
- sequence stratigraphy
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