摘要
首次提出在晚二叠世合山组碳酸盐岩含煤岩系发育过程中存在沉积间断，并在其中鉴别出众多的沉积间断标志：①灰岩的角砾化现象；②淡水作用下的重结晶粗大方解石颗粒；③古裂隙；④古溶洞；⑤氧化壳；③砾石层；③层状晶洞。这些沉积间断标志通常分布在煤层的间接底板顶部或上部。在合山组形成过程中，至少发生了３次沉积间断：４煤形成前、４煤形成期间及２煤形成前。
A number of discontinuous sedimentary indexes have been proposed for the first time in the Upper Permian Heshan Formation as follows:(1)brecciated limestones,(2)coarse recrystallization calcite formed by freshwater diagenesis,(3)paleocracks,(4)paleokarst,(5)oxidized crust,(6)conglomerate beds and(7)bedded caves.These indexes are found in the top and in the upper coal seat.At least three discontinuous sedimentations have occurred during the sedimentary process of the Upper Permian Heshan Formation.
出处
《地质科技情报》
CAS
CSCD
北大核心
1994年第2期47-52,共6页
Geological Science and Technology Information
基金
自然科学基金
关键词
沉积间断
晚二叠世
合山组
煤田
discontinuous sedimentary index,discontinuous sedimentation,Late Permian,Heshan Formation,Heshan coal-field
