新疆哈密地区晚泥盆世疑源类化石的发现及地质意义

从新疆哈密地区石城子北剖面7件样品获得分异度较高、有机质壁显著炭化保存的疑源类化石,根据其形态特征,共鉴定出14个形态属和15个形态种(其中8个未定种,3个比较种)。结合国内外古生代晚泥盆世已知疑源类组合进行比较,清楚表明当前获得的疑源类组合代表了晚泥盆世海洋微体浮游植物群面貌。我国涉及晚古生代疑源类生物地层的调查研究相对薄弱,而有关晚泥盆世疑源类化石的发现和报道更为匮乏,当前疑源类化石的发现,填补和丰富了新疆乃至国内晚泥盆世疑源类化石研究资料。该发现佐证了关于卡拉麦里洋在早石炭世闭合的认识;作为基础食物链的海洋微体浮游植物是重要成烃生物,晚泥盆世疑源类的保存预示研究区域具有石油、天然气勘察的前景。

DISCOVERY OF THE LATE DEVONIAN ACRITARCHS FROM HAMI,XINJIANG AND ITS GEOLOGICAL SIGNIFICANCE

Diverse and obviously carbonized organic-walled acritarchs have been obtained from seven samples in the Shichengzi section of Hami,Xinjiang.They are identified as 14 morphological genera and 15 morphological species(including 8undecided species and 3conformis species).Compared with the Late Devonian acritarch assemblages known at home and abroad,this acritarch assemblage distinctly represented as micro-phytoplanktonic aspect of the Late Devonian.The investigation of the Late Paleozoic acritarch biostratigraphy in China is relatively few and known data of Late Devonian acritarchs are more deficient.The discovery fills and enriches study of the Late Devonian acritarchs in Xinjiang and even China.This study would provide evidence to support the recognition that the close of"Kalameli ocean"was at the Early Carboniferous.In addition,it indicates that the investigated area has well prospect for searching oil and gas,since microphytoplankton as basal nutrient chains was very important source of hydrocarbon.