黔南独山上泥盆统层序、海平面变化和成岩层序地层研究

Stratigraphic Sequences, Sea - Level Changes and Diagenetic Sequence Stratigraphy of the Upper Devonian in Dushan County, South Guizhou Province

贵州独山的上泥盆统由碳酸盐缓坡和碳酸盐台地两种沉积类型组成,包括13种沉积相和25种微相类型.它们构筑了6个层序,其中3个Ⅰ型层序和3个Ⅱ型层序.与6个层序对应的6个三级海平面升降旋回的速度、幅度和频率显示了不同的特征,第1和第2个旋回呈高幅、低频速进和高频缓退特征.第3个旋回为高幅、高频速进和高频缓退.第4个旋回为低幅、高频的中速进-退特征.第5、6个旋回具中、高幅高频缓进和低频速退特征.本文最后对不同沉积体系域和两种层序界面的成岩特征进行了探讨.

The Upper Devonian in Dushan County, Guizhou Province is composed of carbonate ramps and platforms, including 13 types of sedimentary fades and 25 types of microfacies. They form six sequences, three of which are Ⅰ-type sequences and other are Ⅱ-type sequences. Six third-order cycles of sea -level change responding to these sequences have different rate, amplitude and frequency. The first and second cycles are characteristics of high-amplitude, low-frequency and rapid rise (transgression) and high frequency slow fall (regression). The third is of high - amplitude, high - frequency and rapid rise and high-frequency slow fall. The fouth is of low-amplitude, high - frequency mid-rate rise and fall. The fifth and sixth are of mid-high amplitude, high frequency slow rise and low-frequency rapid fall. Finally,the diagenetic features of different depositional system tracts and two types of sequence boundaries are discussed.