摘要
辽宁省葫芦岛三道沟剖面张夏组顶部发育保存极好的巨型鲕粒。基于野外描述和镜下显微组构资料,分析研究区巨型鲕粒的结构特征。结果表明:三道沟剖面张夏组鲕粒表现为放射状和放射—同心状结构,由亮晶方解石、暗色泥晶和白云石晶体组成;鲕粒核心、皮层及外部的泥晶套内发育直径较大且相互缠绕的葛万菌;鲕粒内部暗色泥晶纹层中存在高密度的黄铁矿晶体残余物、白云石和放射纤维状方解石结壳。研究区鲕粒在形成过程中与光合微生物膜的钙化作用、早期石化作用、微生物诱导引发的碳酸盐矿物原地沉淀作用关系密切,鲕粒是与微生物生命活动密不可分的产物。该结果可为鲕粒的光合作用生物膜建造模式研究提供参考。
There are well-preserved giant ooid at the top of Zhangxia Formation in Sandaogou Section of Huludao,Liaoning Province.Based on the field description and the microstructure data under the microscope,the structural characteristics of the giant ooid in the study area are analyzed.The results show that the ooids have radial and radial-concentric structure,composed of bright crystal calcite,dark mud crystal and dolomite crystal;there are large diameter and entangled Girvanella in the oolitic core,skin and outer micrite sheath;high-density residues of pyrite crystals,dolomite and radiofibrous calcite crusts in the dark micrite laminae are found inside the ooid.This indicates that the formation of Huludao ooid is closely related to the calcification of photosynthetic microbial membranes,early petrification and in situ precipitation of carbonate minerals induced by microorganisms.Therefore,ooids are likely to be inseparable from the life activities of microorganisms,or they may provide an important reference for the photosynthetic biofilm construction model of ooid.
作者
柴凯旗
秦仁月
CHAI Kaiqi;QIN Renyue(School of Earth Science and Resources,China University of Geosciences(Beijing),Beijing 100083,China)
出处
《东北石油大学学报》
CAS
北大核心
2021年第3期73-85,I0006,共14页
Journal of Northeast Petroleum University
基金
国家自然科学基金项目(41492090)。
作者简介
柴凯旗(1994-),男,硕士研究生,主要从事微生物碳酸盐岩方面的研究。
