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Discussion on Induan-Olenekian Boundary in Chaohu, Anhui Province, China 被引量:7
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作者 Zhao Laishi Tong Jinnan Zuo Jingxun Ming Houli China University of Geosciences, Wuhan 430074 《Journal of China University of Geosciences》 SCIE CSCD 2002年第2期141-150,共10页
This paper proposes a scheme for the definition of the Lower Triassic Induan Olenekian boundary (IOB) based on investigation of sections in Chaohu, Anhui Province, China as well as data accumulated from other studies... This paper proposes a scheme for the definition of the Lower Triassic Induan Olenekian boundary (IOB) based on investigation of sections in Chaohu, Anhui Province, China as well as data accumulated from other studies elsewhere. The conodont Neospathodus waageni is suggested as the index fossil of the boundary. According to the FAD of N. waageni , the IOB is at the base of bed 25 2 of the West Pingdingshan Section in Chaohu, 42.19 m above the Permian Triassic boundary, and it is slightly higher than the base of the Flemingites Euflemingites Ammonoid Zone at the section. 展开更多
关键词 Lower Triassic Induan olenekian boundary conodont biostratigraphy CHAOHU Anhui Province.
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Lower Triassic and Induan-Olenekian Boundary in Chaohu,Anhui Province,South China 被引量:10
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作者 TONG Jinnan ZHAO Laishi 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2011年第2期399-407,共9页
Since the West Pingdingshan Section in Chaohu was proposed as the candidate of the Global Stratotype Section and Point of the Induan-Olenekian boundary in 2003, the Lower Triassic of Chaohu has been extensively studie... Since the West Pingdingshan Section in Chaohu was proposed as the candidate of the Global Stratotype Section and Point of the Induan-Olenekian boundary in 2003, the Lower Triassic of Chaohu has been extensively studied. Based on the studies on the Lower Triassic of Chaohu, (1) a continuous conodont zonation is established, which has become an important reference for Lower Triassic stratigraphic correlation over the world; (2) the First Appearance Datum of conodont Neospathodus waageni was suggested and has been basically accepted as the primary marker to define the InduanOienekian boundary; (3) a characteristic Lower Triassic excursion of carbon isotopes was brought to light and has been proven to be not only an excellent index for the stratigraphic correlation but also a unique indication for the perturbation of ecological environments in the aftermath of the end-Permian mass extinction; (4) a magnetostratigraphic sequence is constituted with a certain biostratigraphic control in the low-latitude region and it presents an important correlation to the Boreal sequence; (5) a cyclostratigraphic study provides an alternative method to constrain the age of the chronostratigraphic units; and (6) a scheme of the Olenekian subdivision is recently suggested to define the boundary between the Smithian and Spathian Substages. In addition, Chaohu is also the type locality of the Chaohuan Stage, the upper stage of the Lower Triassic in the China Chronostratigraphic System.Thus, the Lower Triassic of Chaohu is not only a classic sequence in South China, but also a key reference sequence to the investigation of the corresponding stratigraphy and geological events over the world. The recent achievements are viewed here for an overall understanding of the sequence. Then the current situation of the Induan-Olenekian and Smithian-Spathian boundaries is discussed to provide a reference for later works. 展开更多
关键词 Lower Triassic Induan-olenekian boundary Smithian-Spathian boundary Global Stratotype Section and Point CHAOHU China
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Unique Marine Olenekian-Anisian Boundary Section from South Primorye, Russian Far East 被引量:3
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作者 Yuri D Zakharov Alexander M Popov Galina I Buryi 《Journal of China University of Geosciences》 SCIE CSCD 2005年第3期219-230,共12页
To show paleontological characteristics of the Olenekian-Anislan boundary beds in the Russian Far East, a review of new data on the Upper Olenekian and Lower Anisian biostratigraphy of South Primorye is given on the b... To show paleontological characteristics of the Olenekian-Anislan boundary beds in the Russian Far East, a review of new data on the Upper Olenekian and Lower Anisian biostratigraphy of South Primorye is given on the basis of five sections: Golyi Cape, Petrovka River, Zhitkov Peninsula, Tchernyschew Bay and Atlasov Cape, using new ammonoid, brachiopod and conodont findings. The most representative ammonoid assemblage at the base of the Anisian was discovered in the Ussuriphyllites amurensis Zone (10.6 m thick) of the Atlasov Cape Section: Parasageceras sp. nov., Prionitidae gen. et sp. nov. , Ussuriphyllites amurensis (Kiparisova) (dominant), Megaphyllites atlasoviensis Zakharov, Leiophyllites praematurus Kiparisova, Leiophyllites sp. , Ussurites sp. , Paradanubites sp. indet., Paracrochordiceras sp. nov., Prohungarites popowi Kiparisova, Arctohungarites primoriensis Zakharov, A. solimani (Toula), Salterites sp. indet. (gigantic shell), and Tropigastrites sublachontanus Zakharov. Conodonts Neospathodus cf. homeri (Bender) were found in the lower part of the Ussuriphyllites amurensis Zone of the Atlasov Cape. The Atlasov Cape seems to be one of the very promising sections of the Russian Far East for detailed investigation of the Olenekian-Anisian boundary. 展开更多
关键词 South Primorye Triassic olenekian-Anisian boundary ammonoid conodont
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An Update of Conodonts in the Induan-Olenekian Boundary Strata at West Pingdingshan Section,Chaohu,Anhui Province 被引量:3
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作者 赵来时 童金南 +1 位作者 张素新 孙知民 《Journal of China University of Geosciences》 SCIE CSCD 2008年第3期207-216,共10页
The Lower Triassic in Chaohu (巢湖) area, Anhui (安徽) Province, China, is well developed and its sequence is typical in South China. After a brief introduction of the Induan-Olenekian boundary of Chaohu, this art... The Lower Triassic in Chaohu (巢湖) area, Anhui (安徽) Province, China, is well developed and its sequence is typical in South China. After a brief introduction of the Induan-Olenekian boundary of Chaohu, this article presents some new data on conodonts. More than ten times of conodont samplings and investigations have recovered thousands of conodont specimens, which are especially rich in the Induan-Olenekian boundary strata at the West Pingdingshan Section in Chaohu City, Anhui Province. The most distinctive forms are the conodonts of the Neospathodus dieneri group and N. waageni group. The first occurrence of N. waageni eowaageni, which is regarded as the indicator of the Induan-Olenekian boundary, is situated at 40.49 m above the base of Yinkeng (殷坑) Formation. Some key conodonts and seven new specimens are introduced. 展开更多
关键词 CONODONT Induan-olenekian boundary Lower Triassic Chaohu.
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A candidate of the Induan-Olenekian boundary stratotype in the Tethyan region 被引量:25
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作者 童金南 Yuri D.Zakharov +2 位作者 Michael J.Orchard 殷鸿福 Hans J.Hansen 《Science China Earth Sciences》 SCIE EI CAS 2003年第11期1182-1200,共19页
The Olenekian Stage of the Lower Triassic is named from the Boreal Realm, but the stage has never been properly defined, nor has it been applied in the low-latitude Tethyan Realm, with exception of North Caucasus and ... The Olenekian Stage of the Lower Triassic is named from the Boreal Realm, but the stage has never been properly defined, nor has it been applied in the low-latitude Tethyan Realm, with exception of North Caucasus and Mangyshlak. This paper proposes a stratotype for the In-duan-Olenekian boundary in the low-latitude Tethyan Realm. South China is one of the main re-gions in the Tethyan Realm with well-developed Lower Triassic sequences and abundant fossils. According to the basic stratigraphic records and various accumulated data, we believe that the West Pingdingshan Section in Chaohu, Anhui Province is one of the best sequences to define the Induan-Olenekian boundary. The first appearance datum (FAD) of conodont Neospathodus waageni is the preferred index to define the boundary. This datum lies 26 cm below the FAD of the ammon-oids Flemingites and Euflemingites, and is located slightly prior to the top of the second Triassic normal magnetozone, and the peak of the first Triassic positive excursion of carbon isotope d 13C. 展开更多
关键词 proposal GSSP Induan-olenekian boundary LOWER Triassic CHAOHU of China.
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High-resolution Induan-Olenekian boundary sequence in Chaohu, Anhui Province 被引量:6
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作者 Hans J. Hansen 《Science China Earth Sciences》 SCIE EI CAS 2005年第3期291-297,共7页
The West Pingdingshan Section in Chaohu, Southeast China’s Anhui Province is one of the potential GSSP candidates for the Induan-Olenekian boundary. Extensive study has been done on the Induan-Olenekian boundary stra... The West Pingdingshan Section in Chaohu, Southeast China’s Anhui Province is one of the potential GSSP candidates for the Induan-Olenekian boundary. Extensive study has been done on the Induan-Olenekian boundary strata at the section to meet the requirements of defining the GSSP precisely. This paper focuses on the boundary strata at the section to present a review of the main results achieved in recent years. The Induan-Olenekian boundary strata here cover an interval of about four meters at the West Pingdingshan Section, in which the key indices of defining the boundary and the chief transitional processes of some parameters at the boundary are included. The relationship between the boundaries defined by ammonoids and by conodonts is well clarified at the section. The magnetic polarity analysis shows that the boundary interval belongs to a normal polarity zone. Both the carbonate and organic carbon isotopes com- positions experienced a significant conversion in the boundary interval. 展开更多
关键词 Lower Triassic Induan-olenekian boundary GSSP candidate CHAOHU of China.
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贵州威宁小河边剖面早三叠世奥伦尼克期双壳类化石及其指示意义
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作者 黄云飞 《长江大学学报(自然科学版)》 2023年第1期13-20,共8页
二叠纪-三叠纪之交生物大灭绝后,双壳类演化较为迅速,以Claraia和Eumorphotis的繁盛为特征。双壳类在经历了漫长的残存-复苏期后,直到中三叠世安尼期才完全复苏。近年的研究指示,双壳类在早三叠世晚期已经进入快速复苏的阶段,然而华南... 二叠纪-三叠纪之交生物大灭绝后,双壳类演化较为迅速,以Claraia和Eumorphotis的繁盛为特征。双壳类在经历了漫长的残存-复苏期后,直到中三叠世安尼期才完全复苏。近年的研究指示,双壳类在早三叠世晚期已经进入快速复苏的阶段,然而华南地区早三叠世晚期的双壳类化石报道较少,限制了对双壳类复苏过程的理解和认识。本研究从贵州威宁小河边剖面永宁镇组底部采集到100多枚双壳类化石,经鉴定共6属9种,包括Pteria sp.,Crittendenia sp.,Eumorphotis kittli,E.telleri,Entolium discites,Neoschizodus laevigatus,N.ovata,Unionites fassaensis和U.canalensis等,其中以Pteria sp.,Neoschizodus laevigatus和Entolium discites数量较多,可归纳为Entolium discites带,其时代为早三叠世奥伦尼克期Spathian亚期,可以作为双壳类在早三叠世晚期快速复苏的例证。 展开更多
关键词 早三叠世 双壳类 奥伦尼克期 生物复苏 威宁
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安徽巢湖平顶山西坡剖面印度阶与奥伦尼克阶界线层高分辨率牙形石生物地层 被引量:3
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作者 赵来时 童金南 +4 位作者 孙知明 常德峰 张克信 张素新 Mike J.Orchard 《地球科学(中国地质大学学报)》 EI CAS CSCD 北大核心 2007年第3期291-302,共12页
下三叠统印度阶与奥伦尼克阶全球候选层型剖面之一的中国安徽省巢湖市平顶山西坡剖面界线层,经连续不间断采样获得大量牙形石化石并进行详细的分带工作,建立了该界线层牙形石生物地层.由下往上划分为:1.Neospathodus dieneri带;2.N.waag... 下三叠统印度阶与奥伦尼克阶全球候选层型剖面之一的中国安徽省巢湖市平顶山西坡剖面界线层,经连续不间断采样获得大量牙形石化石并进行详细的分带工作,建立了该界线层牙形石生物地层.由下往上划分为:1.Neospathodus dieneri带;2.N.waageni带.前者依次分为3个亚带:N.dieneri Morphotype1亚带,N.dieneri Morphotype2亚带和N.dieneri Morphotype3亚带.牙形石带可与该界线层的菊石带进行很好的对比;在详细区分牙形石Neospathodus属内各种特征的基础上,结合地层分布情况,跨越印度阶与奥伦尼克阶界线,演化谱系十分明显,牙形石N.dieneri Morphotype3在奥伦尼克阶之底即Smithian初期演化为:N.dieneri Morphotype3→N.waageni→N.pingdingshanensis、Neos-pathodus dieneri Morphotype3→N.waageni(细齿直立型)→N.n.sp.R和Neospathodus dieneri Morphotype3→N.pakistanensis.从谱系演化的观点出发认为:N.waageni的首现点作为奥伦尼克阶底界是合理的,并在该剖面确定了印度阶与奥伦尼克阶界线位于第24-16层,距剖面大隆组与殷坑组界线40.49m处. 展开更多
关键词 牙形石 演化谱系 下三叠统 印度阶与奥伦尼克阶界线 安徽巢湖
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右江盆地西北缘安然背斜东段奥伦尼克期牙形石生物地层研究及地质意义
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作者 向坤鹏 安亚运 +4 位作者 贺永忠 赵磊 刘奎勇 盘应娟 易成兴 《地质学报》 EI CAS CSCD 北大核心 2021年第8期2333-2345,共13页
罗楼组上部灰岩段是右江盆地西北缘奥伦尼克期海生爬行动物化石的唯一赋存层位,生物地层研究精度较低。本文以安然背斜东段敢南、者堡一带罗楼组为研究对象,通过剖面测制,对该组上部灰岩段进行系统的牙形石生物地层研究。结果显示,敢南... 罗楼组上部灰岩段是右江盆地西北缘奥伦尼克期海生爬行动物化石的唯一赋存层位,生物地层研究精度较低。本文以安然背斜东段敢南、者堡一带罗楼组为研究对象,通过剖面测制,对该组上部灰岩段进行系统的牙形石生物地层研究。结果显示,敢南一带罗楼组上部可识别出5个牙形石带,者堡一带罗楼组上部可识别出3个牙形石带。根据两条剖面牙形石生物地层对比,认为右江盆地西北缘奥伦尼克期包含5个牙形石带,自下而上依次为:Neospathodus pakistanensis带、Novispathodus waageni带、Neospathodus crassatus带、Icriospathodus collinsoni带以及Triassospathodus homeri-Tr.symmetricus组合带。区内早三叠世海生爬行动物主要产于Triassospathodus homeri-Tr.symmetricus组合带。该研究结果为罗楼组上部灰岩段海生爬行动物群时代的限定提供可靠的生物依据,并为进行奥伦尼克期海生爬行动物群产出层位的精细对比提供佐证。 展开更多
关键词 罗楼组 奥伦尼克期 牙形石生物地层 安然背斜东段 右江盆地西北缘
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印度阶-奥伦尼克阶界线层型候选剖面——安徽巢湖平顶山西剖面地层序列 被引量:23
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作者 童金南 Hans J.Hansen +1 位作者 赵来时 左景勋 《地层学杂志》 CSCD 北大核心 2005年第2期205-214,共10页
位于安徽省中部巢湖市郊的平顶山西剖面被推荐为印度阶-奥伦尼克阶界线的全球层型候选剖面。系统记述了该剖面的地层序列,包括岩石地层、生物地层、磁性地层、碳氧同位素地层和旋回地层等方面的最新研究成果。该剖面包括3个岩石地层单元... 位于安徽省中部巢湖市郊的平顶山西剖面被推荐为印度阶-奥伦尼克阶界线的全球层型候选剖面。系统记述了该剖面的地层序列,包括岩石地层、生物地层、磁性地层、碳氧同位素地层和旋回地层等方面的最新研究成果。该剖面包括3个岩石地层单元、7个牙形石带、5个菊石带、3个双壳类带;在剖面下段地层中识别出2个正向磁性带和2个反向磁极性带;与地球轨道天文周期相对应的Milankovitch气候沉积旋回也可以明确地辨认;碳氧同位素δ1 3Ccarb演变呈现两次大的旋回。以牙形石N eospathodus waageni首现定义的印度阶-奥伦尼克阶界线在该剖面上位于三叠系第二个主要的正向极性带近顶部,也接近三叠纪碳同位素δ1 展开更多
关键词 下三叠统 印度阶 奥伦尼克阶 界线层型 巢湖 安徽
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下三叠统殷坑阶和巢湖阶及其界线研究 被引量:15
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作者 童金南 赵来时 左景勋 《地层学杂志》 CSCD 北大核心 2005年第B11期548-564,共17页
系统介绍层型剖面殷坑阶和巢湖阶的定义和地层特征,并重点讨论了两阶之间的界线,即巢湖阶的底界。巢湖阶的底界层型位于近期提出的全球印度阶?奥伦尼克阶界线层型候选剖面———安徽巢湖平顶山西坡剖面上,界线定义为以牙形石Neospathodu... 系统介绍层型剖面殷坑阶和巢湖阶的定义和地层特征,并重点讨论了两阶之间的界线,即巢湖阶的底界。巢湖阶的底界层型位于近期提出的全球印度阶?奥伦尼克阶界线层型候选剖面———安徽巢湖平顶山西坡剖面上,界线定义为以牙形石Neospathodus waageni的首现点作为第一标志,菊石Flemingites-Euflemingites带底界作为参考标志。在巢湖剖面上,该界线位于三叠纪第2个正向磁极性带上部、三叠纪碳同位素曲线第1次正向漂移峰值附近;在岩石地层系统中,它位于殷坑组中上部位。简要概述了该界线地层的国际和国内对比的主要标志性化石。 展开更多
关键词 下三叠统 年代地层 殷坑阶 巢湖阶 界线层型 巢湖 安徽
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Early Anisian(Middle Triassic)Conodonts from Romania and China,with Comments on Their Role in the Recognition and Correlation of the Base of the Anisian 被引量:1
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作者 Martyn Lee Golding 《Journal of Earth Science》 SCIE CAS CSCD 2021年第3期573-591,共19页
The Olenekian-Anisian Boundary(OAB)interval is an important time in Earth history,reflecting the last phase of marine ecosystem recovery in the aftermath of the end-Permian mass extinction.Despite this,the Global Stra... The Olenekian-Anisian Boundary(OAB)interval is an important time in Earth history,reflecting the last phase of marine ecosystem recovery in the aftermath of the end-Permian mass extinction.Despite this,the Global Stratotype Section and Point(GSSP)for the base of the Anisian remains undefined.The first appearance of the conodont Chiosella timorensis has been proposed as a potential index for the boundary;however,the discovery of this conodont with ammonoids traditionally considered to be Spathian has generated doubts about its suitability.The taxonomy and relationships of early Anisian conodonts,including species of Chiosella,remain understudied,which leads to difficulties in correlation.New species of Neogondolella(N.gradinarui)and Magnigondolella(M.n.sp.D)have been recognized from the leading GSSP candidate section for the OAB at De?li Caira,and from an additional OAB section at Guandao.Furthermore,several species previously identified in Canada and the USA can be recognized from these sections,improving correlation between Tethys and North America.One of these species may serve as a suitable alternative proxy for the OAB;for instance,N.curva appears just below the first Anisian ammonoids in De?li Caira,and just above the first appearance of C.timorensis in both De?li Caira and Guandao.Continued work on sections other than the candidate sections,and on the taxonomy of species outside of those traditionally proposed as indices,is required. 展开更多
关键词 olenekian ANISIAN Neogondolella Magnigondolella De?li Caira Guandao
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