Carbon isotopic excursions and detailed ammonoid and conodont biostratigraphies around Smithian-Spathian boundary in the Bac Thuy Formation, Vietnam
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- 作者：Toshifumi Komatsua ; komatsu@sci.kumamoto-u.ac.jp" class="auth_mail" title="E-mail the corresponding author ; Reishi Takashimab ; Yasunari Shigetac ; Takumi Maekawaa ; Huyen Dang Trand ; Tien Dinh Congd ; Susumu Sakatae ; Hung Doan Dinhf ; Osamu Takahashig
- 关键词：Ammonoid ; Conodont ; Biostratigraphy ; Carbon isotopic excursion ; Lower Triassic ; Smithian&ndash ; Spathian boundary ; Anoxic to dysoxic facies
- 刊名：Palaeogeography, Palaeoclimatology, Palaeoecology
- 出版年：2016
- 出版时间：15 July 2016
- 年：2016
- 卷：454
- 期：Complete
- 页码：65-74
- 全文大小：2105 K
文摘
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We describe Smithian–Spathian boundary (SSB) section in Vietnam.
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Ammonoid and conodont biostratigraphic zones are recognized around SSB.
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TOC of the organic-rich limestone and mudstone ranges from 0.3 to 0.88 wt‰.
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SSB is embedded in organic-rich mudstone suggesting anoxic to dysoxic conditions.
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Highδ13C values around + 5.8‰ are recorded in the late Smithian organic-rich limestone.