本文選題：牙形石生物地層　切入點：晚古生代　出處：《中國地質(zhì)大學(北京)》2017年碩士論文

【摘要】：廣西是中國晚古生代地層發(fā)育最好的地區(qū)之一。廣西隆林德峨地區(qū)出露一套連續(xù)的晚古生代碳酸鹽巖地層序列,為研究晚古生代牙形石生物地層序列提供了良好的基礎(chǔ)。本論文對德峨地區(qū)那地-石丫口晚古生代地層剖面進行實測,該剖面包含的巖石地層單元自下而上包括融縣組(D3r)、都安組(C1-2d)、黃龍組(C2h)、馬平組(C2P1m)、礁灰?guī)r一段(Pbls1)、礁灰?guī)r二段(Pbls2)、礁灰?guī)r三段(Pbls3)。本次研究采集牙形石樣品96個,經(jīng)分析處理獲得了保存較好的牙形石化石。經(jīng)鑒定識別出牙形石43屬52種,自下而上劃分出9個牙形石化石帶:(1)Palmatolepis marginifera帶(晚泥盆世);(2)Palmatolenpis rugose trachyteraPalmatolepis glabra glabra組合帶(晚泥盆世);(3)Siphonodella sulcata帶(早石炭世);(4)Siphonodella crenulata帶(早石炭世);(5)Siphonodella isosticha帶(早石炭世);(6)Jinogondolella altudaensis帶(中二疊世);(7)Clarkina subcarinata-Clarkina changxingensis組合帶(晚二疊世);(8)Clarkina yini帶(晚二疊世);(9)Clarkina meishanensis帶(晚二疊世)。由于泥盆系與石炭系的界線通常由牙形石Siphonodella sulcata一種的首次出現(xiàn)來標識,該種在研究剖面28層中距離底部2m處的樣品中發(fā)現(xiàn),28層以下各層所取樣品中均未發(fā)現(xiàn)該種,因此推測泥盆系與石炭系的界線大致處于研究剖面28層中距離底部2m處,即Siphonodella sulcata帶底部。
[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.
【學位授予單位】：中國地質(zhì)大學(北京)
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：Q915

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本文編號：1668893