鲁西上元古界佟家庄组的微体植物化石  

LATE PROTEROZOIC MICROFOSSILS FROM THE TONGJIAZHUANG FORMATION, WESTERN SHANDONG, CHINA

作　　者：尹磊明[1] 

机构地区：[1]中国科学院南京地质古生物研究所,南京210008

出　　处：《微体古生物学报》1991年第3期253-269,354-357,共17页Acta Micropalaeontologica Sinica

摘　　要：鲁西安丘地区停家庄组含保存很好的微体植物化石。经研究计有14属11种(含1新种),1相似种和6个未定种。这一微体植物化石组合以球形疑源类最多,另有少数Micrhystridium,?Ceratophyton conicum以及丝状微体化石的标本。根据佟家庄组微体植物化石组合与国内外已知组合的比较,并参考从上覆浮莱山组获得的同位素年龄资料,笔者认为鲁西佟家庄组与安徽淮南地区的刘老碑组是同时的,皆为800—700Ma前沉积形成。The Proterozoic sediments in western Shandong or China, called the 'Tumen Group',are subdivided in ascending order into the Heishanguan, Erqingshan, Tongjiazhuang,Fulaishan and Shiwangzhuang Formations with seven members. The 'Tumen Group' isdiscontinuously underlain by the Archeozoic Taishan Group and is disconformablyoverlain by the Wushan Formation of Lower Cambrian. Both the Heishanguan andErqingshan Formations are absent in the Anqiu district under study, with theTongjiazhuang Formation directly overiying the Archeozoic Taishan Group. Abundantand well-preserved microfossils have been obtained from the Upper Member of theTongjiazhang Formation. The microfossil assemblage of the Tongjiazhuang Formation isdominated by sphaeromorphids of acritarchs with 14 genera, 11 species. (including 1 newspecies), 1 confer specie and 6 uncertain species, in addition to a few specimens ofMicrhystridium, some large process-like fragments (?Ceratophyton conicum), as well asfilamentous microfossils. Based on correlation between the present Tongjiazhuang assem-blage and previous Proterozoic microfossil data (fig. 3), and in consideration of radiometricdating (631.4, 661 and 669 Ma, by K-Ar age method) for the overlying Fulaishan Forma-tion, the author suggests that the Tongjiazhuang Formation is of the same are as theLiulaobei Formation in Huainan district or Auhui Province, i. e., about 800 and 700 Ma. Genus Eoaperturilites Yin, 1985 Type species E. monoscissus Yin 1985(by original designation) Eoaperturilites anqiuensis sp. nov. (pl. Ⅱ, figs. 4, 8. 9. 11--13) Diagnosis Vesicle subcircular in outline; wall firm or loose, smooth or with minutesculptures. A subcircular rupture (excystment aperture) present at one end of vesicle. Dimension Vesicle 35--90μm in diameter; subcircular rupture 8--12μm across (meas-ured from 15 specimens). Holotype specimen P14D14BF-1; pl. Ⅱ, fig.11. Etymology Anqiu, the fossiliferous locality. Remarks In morphological aspect some specimens of the new species are quite similarto Monotrematosphaerid

关 键 词：微体古植物 化石 山东 

分 类 号：Q913.84[天文地球—古生物学与地层学]