广西隆林德峨地区晚古生代牙形石生物地层

发布时间：2018-03-26 17:44

本文选题：牙形石生物地层　切入点：晚古生代　出处：《中国地质大学(北京)》2017年硕士论文

【摘要】：广西是中国晚古生代地层发育最好的地区之一。广西隆林德峨地区出露一套连续的晚古生代碳酸盐岩地层序列,为研究晚古生代牙形石生物地层序列提供了良好的基础。本论文对德峨地区那地-石丫口晚古生代地层剖面进行实测,该剖面包含的岩石地层单元自下而上包括融县组(D3r)、都安组(C1-2d)、黄龙组(C2h)、马平组(C2P1m)、礁灰岩一段(Pbls1)、礁灰岩二段(Pbls2)、礁灰岩三段(Pbls3)。本次研究采集牙形石样品96个,经分析处理获得了保存较好的牙形石化石。经鉴定识别出牙形石43属52种,自下而上划分出9个牙形石化石带:(1)Palmatolepis marginifera带(晚泥盆世);(2)Palmatolenpis rugose trachyteraPalmatolepis glabra glabra组合带(晚泥盆世);(3)Siphonodella sulcata带(早石炭世);(4)Siphonodella crenulata带(早石炭世);(5)Siphonodella isosticha带(早石炭世);(6)Jinogondolella altudaensis带(中二叠世);(7)Clarkina subcarinata-Clarkina changxingensis组合带(晚二叠世);(8)Clarkina yini带(晚二叠世);(9)Clarkina meishanensis带(晚二叠世)。由于泥盆系与石炭系的界线通常由牙形石Siphonodella sulcata一种的首次出现来标识,该种在研究剖面28层中距离底部2m处的样品中发现,28层以下各层所取样品中均未发现该种,因此推测泥盆系与石炭系的界线大致处于研究剖面28层中距离底部2m处,即Siphonodella sulcata带底部。
[Abstract]:Guangxi is one of the best developed late Paleozoic strata in China. It provides a good basis for the study of the late Paleozoic conodont biostratigraphic sequence. The lithostratigraphic units in this section include Rong County formation (D _ 3rhe), Duan formation (C _ (1-2d)), Huanglong formation (C _ 2H _ 2), Maping formation (C _ 2P _ 1m ~ (-1)), reef limestone (n = 1) Pbls1, reef limestone (2) Pbls2 ~ (2) and reef limestone (3) Pbls3 ~ (3) from the bottom to the top of the section. In this study, 96 conodont samples were collected. The conserved conodont fossils were obtained by analysis and treatment. 52 species of 43 genera of conodonts were identified. Nine conodont fossil belts, Palmatolepis marginifera (Palmatolenpis rugose trachyteraPalmatolepis glabra glabra) (Palmatolenpis rugose trachyteraPalmatolepis glabra glabra) (late Devonian) (3Siphonodella sulcata) (early Carboniferous) 4Siphonodella crenulata (early Carboniferous) Siphonodella isosticha (early Carboniferous) are divided into 9 Palmatolepis marginifera (Palmatolenpis rugose trachyteraPalmatolepis glabra glabra assemblages). The changxingensis assemblage (the late Permian (late Permian) ~ (8) Clarkina yini (late Permian) ~ (9) Clarkina meishanensis (late Permian)). Because the boundary between Devonian and Carboniferous is usually marked by the first occurrence of a kind of conodont Siphonodella sulcata, This species has not been found in the samples in the 28 layers below the bottom of the study profile, so it is assumed that the boundary between the Devonian and Carboniferous systems is approximately 2 m from the bottom of the 28 layers of the study profile. That is, the bottom of the Siphonodella sulcata band.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：Q915

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