首页|Global paleobiogeography of Albian-Cenomanian(mid-Cretaceous)marine ostracods

Global paleobiogeography of Albian-Cenomanian(mid-Cretaceous)marine ostracods

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Despite their potential for providing important information for paleobiogeography,studies using ostracod assemblages compiled from global datasets have been scarce so far.In this study,the paleogeo-graphic implications of the relationship between different ostracod assemblages are analyzed and discussed for the Albian and Cenomanian.We compiled an ostracod dataset at the genus level,with 168 genera for the Albian and 174 for the Cenomanian,to which different multivariate statistical methods of grouping were applied.The affinity between different ostracod assemblages from different regions allowed for the delin-eation of 30 operational geographic units(OGUs)for the Albian,and 32 OGUs for the Cenomanian,grouped in three paleobiogeographic units(PBUs;Megatethys,Persia,and Austral)and one sub-unit(PBSU;Maghreb associated to the Megatethys).The Maghreb PBSU showed minor changes between the Albian and Cenomanian.The relationship among the OGUs grouped in each PBU is related to different factors,such as eustatic sea level events,similar climatic zones,and marine current circulation patterns.A relationship was observed between the Gabon and Nigeria OGUs with the Persia PBU,which suggests a direct east-west connection between them during the Cenomanian.The affinity observed in the Austral PBU between the South American,South African,and Australian regions during the Albian can be explained by their relative geographic isolation due to the Walvis Ridge barrier.The eventual flooding of this barrier led to the relationship observed between the SE Brazilian and Bolivian regions with the Austral PBU.Finally,the data also suggested that the separation of the Indian subcontinent from the Austral PBU took place during the Cenomanian.

Operational geographic unitsPaleobiogeographic unitsAlbianCenomanianMarine ostracods

Bernardo Vázquez-García、Jorge Villegas-Martín、Gerson Fauth、Leonardo Borghi、Aristóteles De Moraes Rios Netto

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Post-Graduate Program in Geology,Unisinos University,São Leopoldo,RS,Brazil

Technological Institute of Paleoceanography and Climate Change-Itt Oceaneon,Unisinos University,São Leopoldo,RS,Brazil

Laboratory of Sedimentary Geology(Lagesed),Department of Geology,Institute of Geosciences,UFRJ-Federal University of Rio de Janeiro,Brazil

Labmicro,Department of Geology,Institute of Geosciences,UFRJ-Federal University of Rio de Janeiro,Brazil

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R&D project registered as Brazilian National Agency of PetroleumNatural Gas and BiofuelsPETROBRAS 2023/00305-8(PALEOCLIMA project-Paleoclimatic evolution and paleobathymetry of the Southern Hemisphere during the Jura

ANP 18993-6

2024

10.1016/j.jop.2024.02.002

古地理学报(英文版)

古地理学报(英文版)

影响因子：0.186
ISSN：
年,卷(期)：2024.13(2)
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