globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2016.04.017
论文题名:
Carbon isotopic excursions and detailed ammonoid and conodont biostratigraphies around Smithian-Spathian boundary in the Bac Thuy Formation, Vietnam
作者: Komatsu T.; Takashima R.; Shigeta Y.; Maekawa T.; Tran H.D.; Cong T.D.; Sakata S.; Dinh H.D.; Takahashi O.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2016
卷: 454
起始页码: 65
结束页码: 74
语种: 英语
英文关键词: Ammonoid ; Anoxic to dysoxic facies ; Biostratigraphy ; Carbon isotopic excursion ; Conodont ; Lower Triassic ; Smithian-Spathian boundary
英文摘要: The Smithian-Spathian boundary is indicated by the first occurrence of the ammonoid Tirolites cf. cassianus in the Olenekian Bac Thuy Formation, northeastern Vietnam. The boundary is intercalated within organic-rich dark gray mudstone that accumulated under anoxic to dysoxic conditions in the An Chau and Nanpanjiang Basins on the South China Block. In Lang Son area, three conodont zones, Novispathodus ex gr. waageni, Novispathodus ex gr. pingdingshanensis, and Icriospathodus collinsoni, are recognized in the formation. The Smithian-Spathian boundary is intercalated within N. ex gr. pingdingshanensis conodont Zone. The positive excursion inδ13C with values increasing from around -2.3‰ to +5.7‰ was recorded in the uppermost Smithian Xenoceltites variocostatus ammonoid beds and N. ex gr. pingdingshanensis conodont Zone. The δ13C values decrease across the Smithian-Spathian boundary. These δ13C isotopic patterns are correlated with well-known positive excursions around the Smithian-Spathian boundary globally. © 2016 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68399
Appears in Collections:过去全球变化的重建

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作者单位: Graduate School of Science and Technology, Kumamoto University, Kumamoto, Japan; The Center for Academic Resources and Archives Tohoku University Museum, Tohoku University, Aramaki Aza Aoba 6-3, Aoba-ku, Sendai, Japan; Department of Geology and Paleontology, National Museum of Nature and Science, 4-1-1 Amakubo, Tsukuba, Japan; Vietnam Institute of Geosciences and Mineral Resources (VIGMR), Hanoi, Viet Nam; Institute for Geo-Resources and Environment, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Japan; Vietnam National Museum of Nature (VNMN), Hanoi, Viet Nam; Department of Astronomy and Earth Sciences, Tokyo Gakugei University, Koganei, Tokyo, Japan

Recommended Citation:
Komatsu T.,Takashima R.,Shigeta Y.,et al. Carbon isotopic excursions and detailed ammonoid and conodont biostratigraphies around Smithian-Spathian boundary in the Bac Thuy Formation, Vietnam[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2016-01-01,454
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