新疆南天山库尔干一带泥盆纪—早石炭世放射虫组合的发现  

Discovery of a Devonian-Lower Carboniferous radiolarian assemblage in the Korgan area,South Tianshan Mountains

作　　者：李玮[1] 胡健民[1] 高卫[1] 李红生[2] 朱志新[3] 

机构地区：[1]中国地质科学院地质力学研究所,北京100081 [2]中国科学院地质与地球物理研究所,北京100029 [3]中国地质科学院地质研究所,北京100037

出　　处：《中国地质》2007年第4期584-591,共8页Geology in China

基　　金：国家自然科学基金项目(40272097);中国石化股份公司油田事业部项目(WX2005-51)资助。

摘　　要：新疆南天山库尔干南阿尔腾柯斯组硅质岩地层中发现了丰富的保存良好的放射虫化石,共计21属34种,11个未定种,1个未定种属。研究表明,两个样品的放射虫组合时代分别为中—晚泥盆世和早石炭世。中—晚泥盆世放射虫组合的发现,丰富了库车地区泥盆纪放射虫生物群组合,为确定阿尔腾柯斯组的时代奠定了生物化石依据。结合前人对该组生物化石的研究,该组为跨时代岩石地层单元,应予解体。而具有早泥盆世—晚石炭世放射虫硅质岩的深水海相沉积地层为古南天山洋盆的演化过程提供了地层学证据。Abundant well-preserved radiolarians were discovered in cherts in the Artengkesi Formation south of Korgan, South Tianshan, Xinjiang. They compris 21 genera and 46 species, of which eleven are indefinite species and one is indefinite genus. Study indicates that the radiolarian assemblages of two samples are Middle- Late Devonian and Early Carboniferous in age. The discovery of the Middle-Late Devonian radiolarian assemblage enriches the Devonian radiolarian fauna in the Kuqa area and provides fossil evidence for the determination of the age of the Artengkesi Formation. On that basis, combined with previous studies of fossils in this formation, the authors think that this formation is an age-straddling lithostratigraphic unit and should be disintegrated into the lower, Middle and Upper Devonian stratigraphic units. The abyssal sediments containing Early Devonian-Late Carboniferous radiolarian cherts provide stratigraphic evidence for the evolution of the South Tianshan paleo-ocean basin.

关 键 词：新疆南天山 库尔干 硅质岩 放射虫组合 形成时代 

分 类 号：Q915[天文地球—古生物学与地层学]