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泥盆纪最早期和最晚期珊瑚群研究的进展 预览 被引量:4

CONODONTS FROM PERMIAN TRIASSIC BOUNDARY BEDS IN JIANGXI,CHINA AND EVOLUTIONARY LINEAGE OF HINDEODUS ISARCICELLA *
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摘要 由于志留-泥盆纪之间没有发生明显的生物更替现象,所以泥盆纪最早期的珊瑚仍保留着浓厚的志留纪珊瑚的色彩。真正的泥盆纪类型的珊瑚是从早泥盆世中期才开始兴起的,至晚泥盆世早期末惨遭绝灭。晚泥盆世晚期的珊瑚却与石炭纪珊瑚有着较为密切的关系。晚泥盆世的珊瑚经历了绝灭-残存-复苏3个发展阶段。泥盆-石炭纪之交,泥盆纪最晚期的珊瑚再遭绝灭,至石炭纪初代之于Tournaisian型的珊胡。正当华南锡矿山的珊瑚群罹 Zhu et al. (1994) have reported the conodonts from the Permian Triassic boundary beds of the Dongling section at Qinshuiyan Township of Xiushui County,and the Yangou section at Rongshan Town of Leping City.The present authors have made a fresh collection from the two sections centimetre by centimetre with the discovery of many conodont specimens of Hindeodus parvus Morphotype 1 and Isarcicella staeschei ,and one of I.isarcica. The exact horizon from which Hindeodus parvus Morphotype 1 first appears could be precisely defined.The boundary beds of the Dongling section consist of clay bed (5-6cm)and Dayie Limestone; Hindeodus parvus Morphotype 1 just began to appear at the lowest horizon of the Dayie Limestone,indicating that the biostratigraphic boundary of the Permian Triassic is coincided with the lithostratigraphic boundary (between the clay bed and limestone,or between JD6 and JD7),and only 5-6cm higher than the eventostratigraphic boundary(between JD5 and JD6).The Yangou section of Leping also consists of limestone. Hindeodus parvus Zone is only 36cm in thickness,and Isarcicella isarcica Zone is first found in this section.The conodont faunas from the two sections are very simple,with no any neogondolellid elements,indicating a shallow water facies,which is quite different from the Changxing section at Meishan.Dongling section represents a typical shallow water facies at the beginning of the Triassic.
作者 廖卫华 Wang Cheng yuan and Wang Shang qi (Nanjing Institute of Geology and Palaeontology,Academia Sinica,Nanjing 210008)
出处 《古生物学报》 CAS CSCD 北大核心 1997年第2期 143-150,共8页 Acta Palaeontologica Sinica
基金 国家自然科学基金,中国科学院古生物与古人类学科特别支持经费
关键词 泥盆纪 珊瑚 绝灭 复苏 底栖动物组合 P/T boundary, H.parvus Zone, I.staeschei Zone,evolutionary lineage,conodont zones,pelagic,shallow water,ostracodes,Jiangxi
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