南京附近宁镇山脉下石炭统层序地层特征

本文从南京附近宁镇山脉的下石炭统中识别出７种沉积相，并在高骊山组中识别出５个底栖生态群落。据沉积相和群落生态分析，本文对该区早石炭世层序地层进行了分析，识别出５个沉积层序，并恢复了南京地区早石炭世海平面变化特征。这一时期该地区的海平面变化特征与全球海平面变化曲线并不完全一致，其原因在于该区当时特殊的古地理位置。

EARLY CARBONIFEROUS SEQUENCE STRATIGRAPHY AND SEA-LEVEL CHANGES IN THE NINGZHEN MOUNTAIN AREA NEAR NANJING,JIANGSU

This paper focuses on the Early Carboniferous sequence stratigraphy of the Ningzhen mountain area. Based on sedimentary factes and ecological analysis,five sequences equivalent to the third-order cycles are recognized in the Wutong,Jinling,Gaolishan,Hezhou and Laohudong Formations in the study area. Two major drops corresponding to the supersequence boundary are also identified in the Lower Carboniferous,one occurs at the boundary between the Jiming and Gaolishan Formations;another appears at the uppermost of the Laohudong Formation. Moreover, the Early Carboniferous sea-level curve for the Lower Yangtze Sea has been reconstructed by the authors according to the above-mentioned sequence stratigraphic analysis for the Naming region. This curve is different from the synchronous eustatic curve by Ross and Ross (1987) because of the specific palaeogeographic position of the study area.