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西藏北部永珠地区石炭系永珠组岩石地层和古生物特征
引用本文:张树岐,王永胜,曲永贵.西藏北部永珠地区石炭系永珠组岩石地层和古生物特征[J].中国地质,2006,33(5):980-987.
作者姓名:张树岐  王永胜  曲永贵
作者单位:吉林省地质调查院,吉林,长春,130061
基金项目:中国地质调查局地质大调查项目(20001300009251)资助。
摘    要:永珠地区位于申扎古生代盆地,区内发育连续的早奥陶世—中二叠世海相沉积序列。石炭系永珠组岩石组合特征为细粒石英砂岩、页岩、粉砂岩,夹多层生物碎屑灰岩,含丰富的生物化石,主要有腕足类、双壳类、牙形刺、珊瑚、苔藓虫、菊石、三叶虫。牙形刺Gnathodusgirtyi—Gnathodustexanus为早石炭世晚期组合;腕足类Productus—Rhipidomellatibetena为早石炭世晚期组合,Choristites—Spirigerella为晚石炭世早期下部组合,Trigonatretacf.paucicostulata—Elivellabaschkirica为晚石炭世早期上部组合。Uncinunellina是典型的冷水习性腕足类,Cyathaxonia是典型的冷水习性珊瑚,表明了全球石炭纪冰期已影响到本区。确定了永珠组的时代为早石炭世晚期—晚石炭世早期,且早石炭世与晚石炭世分界线在第11层与第12层之间。

关 键 词:西藏  永珠组  岩石地层  古生物  石炭系
文章编号:1000-3657(2006)05-0980-08
收稿时间:2005-05-08
修稿时间:2005-05-082005-12-25

Lithostratigraphic and paleontological characteristics of the Carboniferous Yunzhug Formation in the Yunzhug area, northern Tibet
ZHANG Shu-qi,WANG Yong-sheng,QU Yong-gui.Lithostratigraphic and paleontological characteristics of the Carboniferous Yunzhug Formation in the Yunzhug area, northern Tibet[J].Chinese Geology,2006,33(5):980-987.
Authors:ZHANG Shu-qi  WANG Yong-sheng  QU Yong-gui
Institution:Jilin Institute of Geological Survey, Changchun 130061,Jilin, China
Abstract:The Yunzhug area is located in the Paleozoic Xainza basin, where Early Ordovician-Middle Permian successive marine sedimentary sequences are developed. The rock association of the Carboniferous Yunzhug Formation consists of fine quartzose sandstone, shale and siltstone with several bioclastic limestonebeds, which contain abundant fossils, mainly including brachiopods, bivalves, conodonts, corals,bryozoans,ammonites and trilobites. The conodont Gnathodus girtyi-Gnathodus texanus assemblage is a late Early Carboniferous assemblage; and the brachiopod Productus-Rhipidomella tibetena assemblage is also a late Early Carboniferous assemblage, the brachiopod Choristites- Spirigerella assemblage occurs in the lower part of the early Late Carboniferous and the brachiopod Trigonatreta cf. paucicostulata- Elivella baschkirica assemblage occurs in the upper part of the early Late Carboniferous. Uncinunellina is a typical cold-water brachiopod and Cyathaxonia is a typical cold-water coral, which indicates that the global Carboniferous glaciation had influenced the whole area then. It is confirmed that the age of the Yunzhug Formation is late Early Carboniferous to early Late Carboniferous, and that the boundary between the Early and Late Carboniferous is placed between bed 11 and bed 12.
Keywords:Tibet  Yunzhug Formation  lithostratigraphy  paleontology  Carboniferous
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