新疆大湾沟晚奥陶世疑源类  

BIOSTRATIGRAPHICAL AND PALAEOGEOGRAPHICAL SIGNIFICANCE OF LATE ORDOVICIAN ACRITARCHS FROM DAWANGOU, XINJIANG

作　　者：李军[1] Reed WICANDER 燕夔[1] 朱怀诚[1,3] 黄智斌[4] 唐鹏[1] 

机构地区：[1]中国科学院南京地质古生物研究所 [2]Department of Geology,Central Michigan University,Mount Pleasant,Michigan 48859,USA [3]现代古生物学与地层学国家重点实验室,南京210008 [4]塔里木油田公司勘探开发研究院

出　　处：《微体古生物学报》2007年第1期1-14,共14页Acta Micropalaeontologica Sinica

基　　金：国家自然科学基金(40670214;40532009);中国科学院创新基金(KZCX3-SW-149);科技部973项目(2006CB806402)联合资助。IGCP503项目"奥陶纪古地理与古气候"的组成部分。

摘　　要：新疆塔里木盆地西北缘大湾沟剖面晚奥陶世地层发现保存良好的疑源类组合。该组合包括17属27种,以棘刺类(特别是Baltisphaeridium)占优势;其次为梭形类,以Navifusa为代表。大湾沟疑源类组合与世界其它地区同期组合对比表明,在晚奥陶世时疑源类古生物地理分区性减弱,不及早—中奥陶世明显。该组合中有13个种仅分布于“Caradoc”—“Ashgill”期,地理分布广泛,因而颇具生物地层学潜力。A well-preserved and diverse acritarch assemblage was recovered from four Upper Ordovician formations of the Dawangou section, Xinjiang, northwestern China （Tarim Block）. This palynomorph assemblage consists of 27 species assigned to 17 genera. The palynomorph assemblage is dominated by acanthomorphic acritarchs （particularly species of Baltisphaeridium）, followed by netromorphs, represented by Navifusa. Comparison of the palynomorph assemblage with correlative age assemblages elsewhere supports the observation that there was little faunal or floral provincialism during the Late Ordovician. In addition, 13 species recovered from the Dawangou section are restricted to the Caradoc-Ashgill, and have a wide geographical range making them useful biostratigraphical taxa.

关 键 词：疑源类 晚奥陶世 生物地层学 古生物地理学 塔里木盆地 新疆 

分 类 号：Q911[天文地球—古生物学与地层学]