• 责任者：Chen Qing (State Key Laboratory of Continental Dynamics ; Department of Geology ; Northwest University ; Xi’an 710069 ; China) ; Li Haiping
• 刊名：Geology and Prospecting
• 出版年：2013
• 卷期：49(5)
• 关键词：寒武纪 ; Cambrian ; 奥陶纪 ; Ordovician ; 地层划分 ; stratigraphic classification ; 柴达木盆地 ; Qaidam Basin
• 页码：p.825-835
• 图表：8 illus., 21 refs.
• 分类号：1200
• issnNo：ISSN0495-5331
• isbnNo：CN11-2043/P

     We have carried out field investigations and precise profile measurements in the Olongbuluk area, northeru margin of the Qaidam basin. In combination with rock assemblages, sedimentary structure, stratigq＇aphie contact relationship and newly discovered fossils, we made a detailed division, and comparison, and redefined the Cambrian-Ordovician strata. The results show that ： （ 1 ） The Olongbuluck Group only contains the third series and Fu- rongian series of Cambrian, and lacks Terreneuvian and second series. （2） The Duoquanshan and Shihuigou Formations are of the lower and middle Ordo- vician, respectively. （3） The original division of the middle Ordovician Datouyanggou Formation should be fragments of structural reformation, which does not match the principle of establishing formation and should be abandoned. （4） Through regional stratigraphie comparison of those blocks around the Qaidam basin, we suggest that the Cambrian-Ordovician strata are exposed over the Olongbuluck block （marine carbonaterock formation）, Tanjianshan Group, Qi- mantage Group, and Naijtal Group （intermediate-acid volcanic construction）, which represent the products of different structural settings and sedimentary environments. This study provides an important basis not only for establishing rational and effective lithostratigraphic and chronostratigraphic systems, but al- so for the evolution of stratigraphic sequence-lithofacies palaeogeography and hydrocarbon resource evaluation of Cambrian-Ordovician in the northern Qaidam basin. Furthermore, it also provides evidence for better understanding tectonic evolution of blocks in the southeast margin of the Tarim basin.