湖南永顺、桃源地区中-上奥陶统大田坝组生物地层新见
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摘要
通过对湖南永顺和桃源4条中–上奥陶统剖面的牙形刺生物地层研究,在湘西北地区中、上奥陶统原先划分(Pygodus anserinus-Yangtzeplacognathus jianyeensis带和Pygodus serra生物带)的基础上,自下而上识别出:牯牛潭组顶部的Pygodus serra生物带(达瑞威尔阶上部)、大田坝组下部的Pygodus anseinus-Yangtzeplacognathus jianyeensis生物带(达瑞威尔阶顶部–桑比阶下部)、大田坝组中部的Baltoniodus variabilis生物带(桑比阶中部)、大田坝组上部的Baltoniodusalobatus生物带(凯迪阶下部–桑比阶上部),以及大田坝组顶部–宝塔组下部的Hamarodus brevirameus生物带(凯迪阶中部)。这一台地边缘相区的牙形刺生物地层序列与扬子台地中心相区的湖北宜昌、重庆石柱及南京江宁等地的牙形刺生物带几乎一致,与斜坡相区的牙形刺生物带也可以进行很好的对比,为台地边缘相区、中心相区以及斜坡相区地层精细对比提供了新的依据,也证明了湖南永顺、桃源(茅草铺)地区应属于扬子台地区。
This contribution documents the late Darriwilian to middle Katian conodonts recovered from four stratigraphic sections exposed in Yongshun and Taoyuan of Hunan Province, South China. Previously only two conodont biozones(i.e., Pygodus anserinus-Yangtzeplacognathus jianyeensis Biozone and Pygodu serra Biozone) were known from the stratigraphic interval in these areas of Hunan. In our study, five conodont biozones are recognized, including ascendingly the Pygodus serra Biozone in the top part of the Kuniutan Formation(late Darriwilian), the Pygodus anserinus-Yangtzeplacognathus jianyeensis biozones in the lower Datianba Formation(latest Darriwilian–early Sandbian), the Baltoniodus variabilis Biozone in the middle of Datianba Formation(middle Sandbian), the Baltoniodus alobatus Biozone in the upper of Datianba Formation(late Sandbian–early Katian), and the Hamarodus brevirameus Biozone in the Pagoda Formation-top part of the Datianba Formation(middle Katian). This conodont succession recognized in Hunan is almost identical to those established in other parts of the Yangtze Platform, particularly those from Yichang of Hubei Province, Shizhu of Chongqing and Jiangning of Nanjing. Therefore, the establishment of these biozones provides new crucial data for a precise correlation of the Middle–Upper Ordovician rocks in Hunan with those from the other well-studied areas on the Yangtze Platform of South China.
This contribution documents the late Darriwilian to middle Katian conodonts recovered from four stratigraphic sections exposed in Yongshun and Taoyuan of Hunan Province, South China. Previously only two conodont biozones(i.e., Pygodus anserinus-Yangtzeplacognathus jianyeensis Biozone and Pygodu serra Biozone) were known from the stratigraphic interval in these areas of Hunan. In our study, five conodont biozones are recognized, including ascendingly the Pygodus serra Biozone in the top part of the Kuniutan Formation(late Darriwilian), the Pygodus anserinus-Yangtzeplacognathus jianyeensis biozones in the lower Datianba Formation(latest Darriwilian–early Sandbian), the Baltoniodus variabilis Biozone in the middle of Datianba Formation(middle Sandbian), the Baltoniodus alobatus Biozone in the upper of Datianba Formation(late Sandbian–early Katian), and the Hamarodus brevirameus Biozone in the Pagoda Formation-top part of the Datianba Formation(middle Katian). This conodont succession recognized in Hunan is almost identical to those established in other parts of the Yangtze Platform, particularly those from Yichang of Hubei Province, Shizhu of Chongqing and Jiangning of Nanjing. Therefore, the establishment of these biozones provides new crucial data for a precise correlation of the Middle–Upper Ordovician rocks in Hunan with those from the other well-studied areas on the Yangtze Platform of South China.
引文
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陈旭,丘金玉.1986.宜昌奥陶纪的古环境演变.地层学杂志,10(1):1-15.
方翔,陈挺恩,宋妍妍,马譞.2015.湖北远安上奥陶统庙坡组鹦鹉螺动物群.地层学杂志,39(2):135-141.
方翔,陈挺恩,张允白,李文杰,张元动.2017.湘西中-上奥陶统大田坝组喇叭角石科鹦鹉螺动物群及其个体发育.古生物学报,56(3):331-346.
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戎嘉余,陈旭.1987.华南晚奥陶世的动物群分异及生物相、岩相分布模式.古生物学报,26(5):507-535.
王成源.1993.下扬子地区牙形刺生物地层与有机变质成熟度的指标.北京:科学出版社.1-326.
王志浩,Bergstr?m S M,马譞,宋妍妍,张元动.2015a.湖北宜昌远安真金和界岭奥陶系牯牛潭组顶部的牙形刺及其地层意义.微体古生物学报,32(3):233-242.
王志浩,伯格斯特龙,张元动,甄勇毅,吴荣昌.2015b.浙赣地区上奥陶统砚瓦山组的牙形刺及其地层意义.古生物学报,54(2):147-157.
王志浩,张智礼,吴荣昌,甄勇毅,张元动,李慧莉.2017a.新疆塔里木板块台地和斜坡相区奥陶系牙形刺生物地层-揭示沉积间断和大坪阶地层之缺失.地层学杂志,41(4):357-367.
王志浩,甄勇毅,马譞,张元动.2017b.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.古生物学报,56(1):37-53.
王志浩,甄勇毅,马譞,张元动.2018.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,35(1):13-29.
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张元动,俞国华,罗璋.2010.浙江临安板桥奥陶系胡乐组笔石新材料及其意义.地层学杂志,34(1):1-7.
张元动,张举,汪建国,宋妍妍,汪隆武,俞国华,黎康清.2012.浙江桐庐县刘家奥陶纪剖面生物地层学初步研究.地层学杂志,36(1):1-12.
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周志强,周志毅,袁文伟.2005.湖北宜昌地区晚奥陶世三叶虫动物群及分带序列.古生物学报,44(3):327-357.
周志强,周志毅,项礼文.2016.中国扬子陆块中、西部奥陶系宝塔组三叶虫动物群.北京:地质出版社.1-422.
周志毅,周志强,袁文伟,周天梅,2000.湘鄂西部地区晚奥陶世三叶虫相和古地理演化。地层学杂志,24(4):249-263.
邹西平.1988.江苏句容仑山附近奥陶纪鹦鹉螺.古生物学报,27(3):309-330.
Bagnoli G&Qi Y P.2014.Ordovician conodonts from Red Petrified Forest,Hunan Province,China.Bollettino della SocietàPaleontologica Italiana,53(2):93-104.
Bergstr?m S M.1962.Conodonts from the Ludibundus Limestone(Middle Ordovician)of the Tvaren area(S.E.Sweden).Arkiv for Mineralogi och Geologi,3:1-61.
Bergstr?m S M.1971.Conodont biostratigraphy of the Middle and Upper Ordovician of Europe and eastern North America.Geological Society of America Memoir,127:83-160.
Branson E B&Mehl M G.1933.Conodont studies.University Missouri Studies,8(1-4):1-349.
Chen T E&Zou X P.1984.On the Baota(Pagoda)Formation//Nanjing Institute of Geology and Palaeotonlogy ed.Stratigraphy and Palaeontology of Systemic Boundaries in China,Ordovician-Silurian Boundary(1).Hefei:Anhui Science and Technology Publishing House.467-498.
Chen X,Zhou Z Y&Fan J X.2010.Ordovician paleogeography and tectonics of the major paleoplates of China.The Geological Society of America Special Papers,466:85-104.
Drygant D M.1974.New Middle Ordovician conodonts from northwestern Volyn.Paleontologicheskii Sbornik,11:54-58.
F?hraeus L E.1966.Lower Viruan(Middle Ordovician)conodonts from the Gullh?gen quarry,southern central Sweden.Sveriges Geologiska Unders?kning Avhandlingar,60(5):1-40.
Fang X,Zhang Y B,Chen T E&Zhang Y D.2017.A quantitative study of the Ordovician cephalopod species Sinoceras chinense(Foord)and its palaeobiogeographic implications.Alcheringa,41(3):321-334.
Foord A H.1988.Catalogue of the fossil Cephalopoda in the British Museum(Natural History),Part.1,1-344.
Hadding A R.1913.Undre dicellograptusskiffern i Sk?ne jamte n?gra d?rmed ekivivalenta bildningar.Lunds Universitets?rsskrift.,Afdeling,2(9):1-90.
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