镇江大力山中、下三叠统沉积特征及环境分析

SEDIMENTARY FEATURES AND ENVTRONMENT ANALYSES OF MIDDLE AND LATER TRTASSTC SERIES OF DALI MOUNTAIN IN ZHENJIANG

镇江大力山中、下三叠统青龙组2段和3段发育的瘤体灰岩属盆地边缘斜坡环境,杂乱瘤体灰岩横向相变为盆地边缘斜坡滑塌重力流成因(深水)的泥晶砾屑灰岩;蠕粒灰岩则为台地前缘斜坡的浅水沉积环境,与浅水重力流的砾屑泥晶灰岩共生.

This paper deals with the rock types and sedimentary features of Middle and Later Triassic Series of Dali Mountain in Zhenjiang and especially analyses the features and origins of knotty limestone and myrmckitie limestone developed in Section 2 and Section 3 of Qinlong group of the arca,as well as the distribution and origin of two types of gravity flow muddy gravel-limestone. The paper has also proved through investigations thc slope cnvironment of knotty limestone basin margin and the muddy gravel-limestone,which is of basin marginal slopesiide gravity flow origin, changed from disordered crosswisc facics knotty limestone. The myrmckitie limestone belongs to shollow-watcr sedimentation cnvironment of fore-margin slopes of table-land associated with the muddy gravel-limestone of ahollow-water gravity flow.