黔中隆起及外围南华-留纪层序地层特征

以黔中地区层序地层研究为基础，并与三都盆区层序地层对比。根据不整合界面、地层结构及地层的堆叠型式等特征，将黔中隆起及外围地区的南华-志留纪地层划分为14个层序，并阐述了各层序及体系域的发育特征。在此基础上，建立了南华-志留纪的岩石地层格架及相对海平面变化曲线。研究区层序地层的特点是：在浅水陆架区，大多数层序由海侵体系域和高水位体系域构成，并且高水位体系域的厚度常大于海侵体系域的厚度；层序所反映的海平面升降变化，在层序的下部表现较剧，常快速上升。通过层序界面的对比研究，界面基本性质进一步得到明确，使地层格架更趋真实。如黔中、黔北南沱组与澄江组的接触关系性质，从盆地区海侵体系域一高水位体系域及层序界面的延伸对比来看，黔中地区缺失这两个体系域，证明这里南沱组与澄江组之间为假整合接触。

The Study on the Nanhuan-Silurian Sequence Stratigraphy in Central Guizhou

On the bases of the study of sequence stratigraphy in Central Guizhou, and correlating them with the sequences of the Sandu basin, 14 sequences have been divided in the Nanhuan to Silurian Systems in central and northern Guizhou. Lacking of lowstand systems tract, most of them consist of transgressive and highstand systems tracts, and this is in accordance with the composing character of shallow - shelf sequences.Through correlation and clarification of the fundamental characters of the sequence boundaries, the stratigraphic framework becomes more accurate. It is identified by extending the transgressive and highstand systems tracts and sequence boundary of Nanhuan -Sinian sequence that these two systems tracts were pinching out to central Guizhou, and the top boundary of Sequence I of Nanhuan - Sinian Periods is a depositional hiatus surface. Through the study, the Nanhuan - Silurian relative sea - level variation curve has been established, this provides a foundation for correlation of sea level changes of these periods in south China and even around the globe.