新疆准噶尔盆地南缘安集海河组中段上部的地质时代与古环境意义  

GEOLOGICAL AGE AND PALAEOENVIRONMENTAL SIGNIFICANCE OF THE UPPER PART OF MIDDLE MEMBER OF THE ANJIHAIHE FORMATION ON SOUTHERN MARGIN OF JUNGGAR BASIN,XINJIANG

作　　者：周春梅[1] 程金辉[2] 阿丽亚·阿木提[1] 师天明[1] 何承全[2] 

机构地区：[1]中国石油天然气集团公司新疆油田公司勘探开发研究院,新疆克拉玛依834000 [2]中国科学院南京地质古生物研究所,江苏南京210008

出　　处：《地层学杂志》2012年第4期723-732,共10页Journal of Stratigraphy

基　　金：中国石油天然气集团公司新疆油田公司勘探开发研究院资助(K10-36)

摘　　要：准噶尔盆地南缘安集海河组过去被认为是始新世或始新世—渐新世的湖相沉积。通过对12个露头和井下剖面的安集海河组中段上部近100个样品中产出的沟鞭藻化石的研究,共鉴定出沟鞭藻52属93种,在此基础上识别出1个组合带2个亚组合带。研究区在安集海河组中段上部沉积时期是明显受到海水影响的,并且海水温度较高;由于大量指示淡水环境的盘星藻存在,表明当时的盐度是不正常的,应属半咸水环境。The Aniihaihe Formation on southern edge of Junggar Basin has been interpreted as lacustrine deposits of Eocene or Eocene to Oligocene age. The current research investigates dinoflagellates extracted from about 100 samples from the upper part of the Middle Member of Anjihaihe Formation at 12 outcrops and boreholes on southern edge of the Junggar Basin. 52 genera and 93 species were identified, and one as- semblage zone with two subzones has been recognized. According to the dinoflagellate assemblage, we in- fer that the studying area was obviously influenced by warm sea water when the upper part of the Middle Member of Anjihaihe Formation was deposited. However, the existence of a large number of Pediastrum indicates deposition in a brackish environmental.

关 键 词：生物地层 沟鞭藻 安集海河组 古近系 准噶尔 新疆 

分 类 号：P534.61[天文地球—古生物学与地层学]