冀西南古元古界赵家庄组石英碎屑颗粒中首次发现微生物化石  

The first microbial fossils from the quartz clastic grain of Paleoproterozoic Zhaojiazhuang Formation in southwestern Hebei Province, China

作　　者：王青春 贺萍 申方乐 惠婧 杨克基 马宝军 Wang Qingchun;He Ping;Shen Fangle;Hui Jing;Yang Keji;Ma Baojun(College of Geosciences,Hebei GEO University,Shijiazhuang 050031;Shandong Key Laboratory of Depositional Mineralization&Sedimentary Mineral,Shandong University of Science and Technology,Qingdao,Shandong 266590;College of Huaxin,Hebei GEO University,Shijiazhuang 050031)

机构地区：[1]河北地质大学地球科学学院,石家庄050031 [2]山东科技大学,山东省沉积成矿作用与沉积矿产重点实验室,山东青岛266590 [3]河北地质大学华信学院,石家庄050031

出　　处：《地质科学》2022年第4期1189-1196,共8页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：国家自然科学基金项目(编号:41802016);山东省沉积成矿作用与沉积矿产重点实验室开放基金项目(编号:DMSM20190027);国家级和省级一流本科课程项目“沉积岩岩石学”(编号:教高函[2020]8号,冀教高函[2020]85号,[2020]25号);省级和校级教改项目(编号:2020GJJG589,2020J03);省级研究生示范课程项目“沉积学原理”(编号:KCJSX2021092);省级课程思政示范项目“沉积岩岩石学”(编号:冀教高函[2021]62号)资助。

摘　　要：冀西南古元古界赵家庄组发育了一套独具特色的沉积地层,近年来在其碎屑岩中识别出“叠层”砂质MISS这种新的微生物成因沉积构造之后,寻找微生物化石的方向更加清晰。本文通过普通岩石薄片的详细观察,在赵家庄组砂岩的石英颗粒中首次发现了微生物化石,尽管部分样品并不太典型,但化石内部结构和外部形态特征及个体大小与元古宇汝阳群的Plicatidium比较一致,其个体的直径大小也在元古代微生物化石范围之内。通过保存状态和特点分析,认为本文在石英碎屑颗粒中发现的微生物化石可能形成于古元古代中期,也有可能来自太古代末期的风化产物,地质时间约为2 530~2 000 Ma或更加古老。石英碎屑颗粒中微生物化石的发现,证明冀西南古元古界赵家庄组地层中保存了较为丰富的微生物信息,碎屑岩的碎屑颗粒也可作为微生物研究的理想对象,这为前寒武纪微生物研究提供了新的线索和方向。In recent years, a new microbiological sedimentary structure, "laminated" sandy MISS, has been identified in the clastic rocks of the unique sedimentary strata developed in Paleoproterozoic Zhaojiazhuang Formation in southwestern Hebei Province, China. Recently, the direction of finding microbial fossils has become much clearer than before. Several sets of microbial fossils have been first identified in quartz particles of sandstone through detailed observations of ordinary rock slice in this paper. Unfortunately, even some samples are not typical, but the internal structure and external morphological characteristics and the individual size of the new founded fossils are consistent with Plicatidium of the Proterozoic Ruyang Group, and their individual diameters are within the range of Proterozoic microbial fossils. Based on the analysis of preservation status and characteristics, it is believed that the microbial fossils found in quartz grains may have been formed in the Middle Paleoproterozoic, or may be from the weathering products of the end of the Archean,with a geological age of about 2 530 Ma to 2 000 Ma or older. The discovery of microbial fossils in quartz clastic grains proves that the Paleoproterozoic Zhaojiazhuang Formation in Southwest Hebei Province contains abundant microbial information, and the clastic grains of clastic rocks can also be used as ideal objects for microbial research, which provides a new clue and direction for the study of Precambrian microorganisms.

关 键 词：古元古代 赵家庄组 石英碎屑颗粒 微生物化石 

分 类 号：P534.3[天文地球—古生物学与地层学] Q913.2[天文地球—地质学]