安徽巢湖凤凰山剖面石炭系微相和层序地层特征

Carboniferous microfacies and sequence stratigraphy of Fenghuangshan profile in Chaohu of Anhui province, China.

应用露头层序地层学基本原理和方法 ,对巢湖凤凰山石炭系剖面进行重新研究。巢湖凤凰山石炭系总厚度为79.0 2 m ,在这个剖面中可以识别出 6种主要岩相、18种微相和 11个三级沉积层序 ,其中六个三级沉积层序属于 I型沉积层序 ,三个属于 II型沉积层序 ,缺失第 9和第 10沉积层序。三级沉积层序在不同的古地理单元和不同的沉积环境中可以进行对比。根据各微相特征和成因 ,揭示了沉积间断面上存在的多期古岩溶现象。

The Carboniferous system exposed at Fenghuangshan in Chaohu, Anhui province, has seven lithogenetic units with a total thickness of 79.02m. Based on outcrop sequence stratigraphic analysis with particular attention to the key survaces or polyphase paleokarstes developed in the interruptions of sedimentation, six types of lithofacies, eithteen types of microfacies and eleven third order sequences in the Carboniferous system are recongnized. The characteristics and genesis of each third order sequence are described and discussed. The third order sequences of S2, S3, S5, S6, S7 and S11 belong to I type of sedimentary sequence, and S1, S4 and S8 —— II type. Sequences S9 and S10 are lacked. The third order sequences in various paleogeographic units and sedimentary environment can be correlated. Sea level change rate and amplitude coresponding to the nine third order sequences are discussed.