新疆塔里木盆地塔中中2井上奥陶统牙形刺化石及生物礁发育时代  

CONODONTS FROM THE UPPER ORDOVICIAN IN WELL Z2 OF THE CENTRAL TARIM BASIN AND THE AGE OF CONODONT-BEARING REEFAL BEDS

作　　者：蔡习尧[1] 袁晓红 吴亚生[3] 

机构地区：[1]中国石油化工股份有限公司石油勘探开发研究院,北京100083 [2]中国石油华北油田分公司勘探开发研究院,河北任丘062552 [3]中国科学院地质与地球物理研究所中国科学院油气资源研究重点实验室,北京100029

出　　处：《微体古生物学报》2014年第3期285-293,共9页Acta Micropalaeontologica Sinica

基　　金：国家自然科学基金项目(编号40802001,41372121);973项目(2012CB214806)资助

摘　　要：首次在新疆塔里木盆地塔中地区中2井上奥陶统良里塔格组礁岩中发现保存精美的牙形刺化石,包括6属13种和未定种,含一个新亚种Belodina longxianensis minor subsp.nov.。根据牙形刺化石确定,良里塔格组上部属于上奥陶统中部的Belodina confluens带。中2井良里塔格组第2—4层生物礁发育的精确时代是Belodina confluens带。Conodonts including 13 species in 6 genera are described from the Lianglitag Formation in Well Z2 of the central Tarim Basin, which ranges from 5 474 to 6 284 m. They are Aphelognathus pyramidalis？, Aphelognathus divergens？ ,Belodina confluens, Belodina baiyanhuaensis, Belodina longxianensis, Belodina longxianensis minor subsp, nov. , Belodina sp. A, Belodina sp. B, ？ Microzarkodina sp. , Panderodus gracilis postoscrobus, Plectodi- nacf. bidentata, Plectodina sp. , Yaoxianognathus lijiapoensisV and Yaoxianognathus yaoxianensis ？. Occurrence of Belodina confluens at 5 522-5 531.6 m indicates that this interval belong to the Belodina confluens Zone. Depth of 5 531.6-6 197.3 m probably belongs to the Belodina confluens Zone, and this needs more study to confirm. Five beds of reef-facies occur in the Lianglitag Formation. The reefal beds 2 to 5 belong to the Belodina confluens Zone.

关 键 词：牙形刺 生物礁 良里塔格组 上奥陶统 塔里木 塔中 新疆 

分 类 号：Q913.2[天文地球—古生物学与地层学] P618.13[生物学—古生物学]