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重庆石柱漆辽地区中、上奥陶统牙形刺序列——揭示达瑞威尔阶下部至桑比阶之间的沉积间断
MIDDLE TO UPPER ORDOVICIAN CONODONT SUCCESSION FROM THE QILIAO SECTION OF SHIZHU,CHONGQING-REVEALING A DEPOSITIONAL HIATUS BETWEEN LOWER DARRIWILIAN AND SANDBIAN

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王志浩 1   甄勇毅 2   马譞 1   张元动 3  
文摘 本文详细描述了重庆石柱漆辽剖面奥陶系达瑞威尔阶(Darriwilian)牯牛潭组至凯迪阶(Katian)宝塔组的牙形刺序列及其对比。牙形刺序列由上而下可分为:宝塔组Hamarodus brevirameus生物带和Amorphognathus superbus生物带;大田坝组的Baltoniodus alobatus,Baltoniodus variabilis和Yangtzeplacognathus jianyeensis生物带;牯牛潭组的Yangtzeplacognathus crassus生物带和Lenodus variabilis生物带。其中Hamarodus brevirameus生物带至Baltoniodus alobatus生物带上部为凯迪阶,B. alobatus生物带下部至Yan gtze p laco gnathus jianyeensis生物带上部为桑比阶(Sandbian),而Yangtzeplacognathus jianyeensis生物带下部,Yangtzeplacognathus crassus生物带和Lenodus variabilis生物带归人达瑞威尔阶。根据文中所识别的牙形刺序列,该剖面显然缺失了达瑞威尔阶中上部的牙形刺生物带如Pygodus serra生物带(即Yangtzeplacognathus protoramosus和Y. foLiaceus生物带),Eoplacognathus suecicus和Dzikodus tablepointensis生物带。因此,在重庆石柱漆辽剖面奥陶系牯牛潭组和大田坝组之间的地层是不连续的,存在一明显的沉积间断,缺失了相当于牯牛潭组标准剖面中上部的地层(达瑞威尔阶中上部)。而这一沉积间断所发生的时间正好与达瑞威尔中晚期全球海平面下降相吻合。
其他语种文摘 Conodonts from the Pagoda Formation (Katian) to the Kuniutan Formation (early Darriwilian) in the Qiliao section, Shizhu, Chongqing are documented. They can be subdivided into (in descending order) the following 7 conodont biozones, including the Hamarodus brevirameus,Amorphognathus superbus,Baltoniodus alobatus, B. variabilis, Yangtzeplacognathus jianyeensis, Yangtze placognathus crassus and Lenodus variabilis biozones. The boundaries of the Katian/Sandbian and the Sandbian/ Darriwilian are within the Baltoniodus alobatus Biozone and the Yangtze placognathus jianyeensis Biozone respectively. The Kuniutan Formation in this section is incomplete in comparison with the type section in Yichang of Hubei Province,with only two conodont biozones, namely the Yangtze placognathus crassus and Lenodus variabilis biozones of the early Darriwilian age represented. Therefore the absence of Yangtze placognathus protoramosus,Y. foliaceus,Eoplacognathus suecicus and Dzikodus tablepointensis biozones of the middle to upper Darriwilian in this section indicates a significant depositional hiatus between the Kuniutan Formation (lower Darriwilian) and the Datianba Formation (Sandbian). Apparently,the time span of the hiatus is well corresponded to the major eustatic sea-level fall during the mid-late Darriwilian. However,this preliminary result is yet to be confirmed by further detailed studies in a wider area located near the current western and northwestern margins of the Yangtze Platform to better confine the temporal and spatial distribution of the hiatus identified herein.
来源 古生物学报 ,2017,56(1):37-53 【核心库】
关键词 牙形刺 ; 沉积间断 ; 达瑞威尔阶 ; 桑比阶 ; 中、上奥陶统 ; 石柱漆辽 ; 重庆
地址

1. 中国科学院南京地质古生物研究所, 南京, 210008  

2. Geological Survey of New South Wales, Australia, Londonderry, 2753  

3. 中国科学院南京地质古生物研究所, 中国科学院资源地层学和古地理学重点实验室, 南京, 210008

语种 中文
文献类型 研究性论文
ISSN 0001-6616
基金 国家基金委重大项目和创新研究群体项目 ;  中国科学院国际伙伴计划(SAFEA) ;  IGCP653项目
文献收藏号 CSCD:5958366

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引证文献 9

1 王志浩 湖北宜昌真金和陈家河奥陶系牯牛潭组至宝塔组的牙形刺及其地层意义 微体古生物学报,2018,35(1):13-29
被引 8

2 马雪莹 重庆南川三泉奥陶系宝塔组碳同位素特征及地层对比 地层学杂志,2019,43(1):18-27
被引 2

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