江苏句容地区早石炭世大塘期高骊山组沉积类型与层序特征

江苏句容高骊山是早石炭世大塘期高骊山组出露较好的剖面。通过野外观测和镜下分析研究，显示高骊山组主要发育泥岩、硅质岩和砂岩。岩性组合显示高骊山组由4 个岩性段组成: ①粉砂岩段、②页岩段、③硅质岩和页岩互层段和④砂岩段。沉积类型分析显示，高骊山组主要发育滨海沉积、浅海--半深海沉积和三角洲沉积，可进一步识别出滨海泻湖、深水陆棚、三角洲前缘和三角洲平原等4 种亚相，泻湖泥质沉积、深水泥质沉积和硅质沉积、间湾、水下河道、朵叶间、分流河道和河道间等7 种沉积微相，以发育深水硅质沉积为特色。根据岩性和岩相变化，高骊山组是一个完整的三级沉积层序。该层序由低位体系域、海侵体系域和高位体系域组成。相对海平面变化分析显示，研究区在高骊山时期经历了一个三级海平面升降过程，控制了三级层序的发育。根据沉积构造分析，高骊山时期为挤压背景下的弧后前陆沉积。

Depositional types and sequence features in Kaolishan Formation of Early Carboniferous Datangian in Jurong，Jiangsu

Kaolishan Formation of Early Carboniferous stage Datangian is outcropped in Kaolishan of Jurong， Jiangsu Province． The Kaolishan Formation mainly developed in mudstone，siliceous and sandstone． The litho associations show that the Kaolishan Formation is composed of four lithological members including: ①siltstone，② shale，③ alternating siliceous and shale and ④sandstone． The main sedimentary types of Kaolishan Formation are coastal，shallow marine-bathyal and delta． Four subfacies including coastal lagoon，deep water shelf，delta front and delta plain，and seven micro-facies including lagoon mud，deep water mud and silicious，inter-bay，underwater channel，inter-lobe，interdistributary channel and interchannel; are further identified，which are characterized by deep water silicious in this area． Based on the ptrology and lithofacies change，the Kaolishan Formation can be regarded as an integral sequence in third order，including LST，TST and HST． The analysis of relative sea level change indicates that there was a third rank of sea level change at duration of the development of the Kaolishan Formation， which controlled the forming of this sequence． Based on the tectonic depositional analysis，the Kaolishan Formation developed under the setting of compressional retro-arc foreland．