河北兴隆中元古界大红峪组微生物成因构造特征及其地质意义  

Characteristics and geological significance of microbially induced sedi mentary structures(MISS) in Mesoproterozoic Dahongyu Formation of Xinglong County,Hebei Province

作　　者：陈留勤[1,2] 

机构地区：[1]东华理工大学核资源与环境省部共建国家重点实验室培育基地,江西南昌330013 [2]东华理工大学地球科学学院,江西南昌330013

出　　处：《岩石矿物学杂志》2013年第3期366-372,共7页Acta Petrologica et Mineralogica

基　　金：东华理工大学核资源与环境教育部重点实验室开放基金项目(NRE1210);博士后科研启动基金项目(DHBHK1102);江西省博士后科研择优资助项目;江西省教育厅科学技术研究项目(GJJ13438)

摘　　要：河北兴隆一带的中元古界长城系大红峪组（1650-1600Ma）以潮下坪灰白色厚层块状细粒石英砂岩为主，在砂岩层面上产出丰富的微生物成因构造（MISS）。详细描述了MISS的沉积特征，并对其成因进行了初步分析。这些微生物成因构造可能反映了华北中元古代浅海潮坪环境被大面积分布的微生物席所覆盖，微生物席对砂质沉积物表面起到有效的保护作用，在一定程度上降低了沉积物的侵蚀和改造作用，从而影响基本沉积作用过程。大红峪组砂岩层面上发育的MISS为探索元古宙浅海环境微生物一沉积作用关系提供了研究材料，对这些MISS的深入研究可以加深对元古宙碎屑沉积体系的理解，从而促进微生物席沉积学的发展。Mesoproterozoic Dahongyu Formation （1 650--1 600 Ma） is characterized by subtidal grayish white thick and blocky fine-grained quartz sandstone in Xinglong area of Hebei Province. Microbially induced sedimentary structures （MISS） are widespread on the sandstone surfaces. This paper described in detail sedimentary fea- tures and preliminarily analyzed the origin of the MISS. The existence of the MISS probably suggests that a large area of subtidal shallow marine environment was covered by omnipresent microbial mats during Mesoproterozoic in North China. Microbial mats effectively protected the surfaces of sandy sediments and reduced the ex- tent of erosion and reworking. Therefore, the growth of microbial mats had an important influence on the basic process of siliciclastic sedimentation. The MISS on the sandstone surfaces of Dahongyu Formation provide materials for the study of the coordinated development relationship between microbial mats and sedimentation in the Proterozoic shallow marine environment. The in-depth study of the MISS is beneficial for the better understanding of the Proterozoic siliciclastic depositional system and contributes to promoting the development of microbialmat sedimentology.

关 键 词：微生物成因构造 微生物席 中元古界 大红峪组 兴隆剖面 

分 类 号：P512.2[天文地球—地质学] Q913[天文地球—古生物学与地层学]