西藏新生代秋乌组孢粉化石的发现及其初步研究  

DISCOVERY AND PRELIMINARY STUDY ON PALYNOFOSSILS FROM THE CENOZOIC QIUWU FORMATION OF XIZANG(TIBET)

作　　者：李建国[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》2004年第2期216-221,共6页Acta Micropalaeontologica Sinica

基　　金：国家 973重点基础科学发展规划研究项目 ( G19980 40 80 0 );国家自然科学基金委员会重点项目 ( 3 993 0 0 2 0)

摘　　要：本文首次报道西藏雅鲁藏布江缝合带附近秋乌组含煤沉积中的孢粉化石。孢粉植物群主要由 Quercoidites,具孔类及三孔沟类花粉组成 ,包括 12科 2 6属及一些未定类群。组合中产有少量的 Graminidites及 Tsugaepolleni-tes。植物群的总体特征显示其时代可能为渐新世至早中新世。秋乌组沉积早期的环境比较温暖。A palynoflora from the lowest Qiuwu Formation near Xigaz, Xizang(Tibet) is newly found and studied. Twelve families and twenty-six gene- ra are recorded. Tricolporate pollen, Quercoidites and pollen with potential affinities to Ulmaceae or Moraceae are predominent in the flora. There are low occurrences of Graminidites and Tsugaepolleni- tes . The palyno-assemblage from the base of the Qiuwu Formation suggests a probable age of Oligocene to Early Miocene, contrasting to the previous opinions of Late Cretaceous to Paleocene, Eocene or Eocene to Oligocene. It also suggests a possibility of warm climate environment during the early stage of its sedimentation.

关 键 词：西藏 新生代 秋乌组 孢粉化石 渐新世 早中新世 

分 类 号：Q914[天文地球—古生物学与地层学]