广西南宁大沙田下泥盆统那高岭组的牙形刺  

LOWER DEVONIAN CONODONTS FROM THE NAGAOLING FORMATION OF THE DASHATIAN SECTION NEAR NANNING,GUANGXI,SOUTH CHINA

作　　者：王成源[1] 陈波[2] 邝国敦 

机构地区：[1]中国科学院南京地质古生物研究所,南京210008 [2]现代古生物学和地层学国家重点实验室中国科学院南京地质古生物研究所,南京210008 [3]广西地质调查院,南宁530023

出　　处：《微体古生物学报》2016年第4期420-435,共16页Acta Micropalaeontologica Sinica

基　　金：国家自然科学基金(No.41302019;41521061;41290260)项目成果之一

摘　　要：世界泥盆系洛霍考夫阶和布拉格阶牙形刺生物地层有较明显的地理分区性,区域对比较困难,中国缺少连续的布拉格阶与洛霍考夫阶灰岩相剖面,牙形刺生物地层的研究,仍很不完善。广西南宁大沙田剖面是目前所知布拉格阶灰岩最多的剖面,在其下部发现了牙形刺Eognathodus irregularis,E.nagaolingensis,E.sulcatus mu morphs,Masaraella pandora(Murphy,Matti et Walliser,1981)W morphotype P element,其时代为布拉格期早期,大致相当于北美的Eognathodus irregularis-Gondwania profunda带和欧洲的E.sulcatus带。中布拉格期牙形刺Pseudogondwania kindlei带,还没有确立。晚布拉格期的牙形刺Polygnathus pirenniae带的存在和时限范围也没有在大沙田剖面得到确定。但大沙田剖面那高岭组的时代属布拉格期早期是肯定的。Lochkovian and Pragian conodonts are found to have an obviously biogeographical province, therefore the conodonts bio-zones from different regions are difficult to correlate. Due to lack continuous Lochkovian to Pragian limestone succession, the conodont biostratigraphic sequence for both stages has not been well established in South China. The Dashatian section, in Nanning, Guangxi, South China, represents the most continuous Lochkovian to Pragian limestone sequence found in South China currently. In this study, eonodont species including Eognathodus irregularis, 17. nagaolingensis, 17. sulcatus mu morphs, Masaraellapandora （Murphy, Matti and Walliser, 1981）W morphotype are identified from the lower part of the Dashatian section, which can roughly correlate to Eognathodus irregularis-Gondwania profunda Zone in North America and 17ognathodus sulcatus Zone in Europe, indicating an Early Pragian age, However, Middle--Late Pragian conodont zones cannot be definitely established in the Dashatian section.

关 键 词：牙形刺 Eognathodus sulcatus E.irregularis E.nagaolingensis 那高龄组 布拉格期早期 大沙田 广西 

分 类 号：Q915[天文地球—古生物学与地层学]