气候变化领域集成服务门户(CCPortal): Early Miocene marine palynology of the Colombian Caribbean Margin: biostratigraphic and paleoceanographic implications

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DOI	10.1016/j.palaeo.2020.109955
	Early Miocene marine palynology of the Colombian Caribbean Margin: biostratigraphic and paleoceanographic implications
	Cárdenas D.; Jaramillo C.; Oboh-Ikuenobe F.
发表日期	2020
ISSN	0031-0182
卷号	558
英文摘要	Dinoflagellate cysts and acritarchs are excellent proxies for biostratigraphic and paleoceanographic studies in neritic sequences. However, Neogene marine palynological studies in tropical latitudes are scarce. Here, we analyzed the marine palynological contents (dinoflagellate cysts, acritarchs, foraminiferal test linings and prasinophytes) of 40 samples from a well drilled in northernmost Colombia, southern Caribbean Sea, spanning the late Chattian–late Burgidalian time interval (~24.1–17.3 Ma). We propose a biostratigraphic scheme that includes an upper Chattian–lower Aquitanian Minisphaeridium latirictum Interval Zone (~23.9–22.0 Ma), an upper Aquitanian Achomosphaera alcicornu Interval Zone (~22.0–20.3 Ma), and a Burdigalian Cribroperidinium tenuitabulatum Interval Zone (~20.3–17.5 Ma). Our results reveal several biostratigraphic events that are heterochronous compared to high latitudes. Furthermore, the conspicuous shift from a peridinioid-dominated to a gonyaulacoid-dominated dinoflagellate cyst assemblage towards the Aquitanian–Burdigalian boundary (~20.7 Ma) indicates a reduction in marine primary productivity. This paleoproductivity decline was probably driven by the initial constriction of the Central American Seaway. © 2020 Elsevier B.V.
英文关键词	Aquitanian–Burdigalian; Caribbean Sea; Central American Seaway; Dinoflagellate cysts; P/G ratio; Paleoproductivity
语种	英语
scopus关键词	biostratigraphy; Burdigalian; dinoflagellate cyst; Miocene; Neogene; paleobiogeography; paleoceanography; paleoproductivity; palynology; Atlantic Ocean; Caribbean Sea; Colombia; Acritarcha; Dinophyceae; Prasinophyceae
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150351
作者单位	Department of Geosciences and Geological and Petroleum Engineering, Missouri University of Science and Technology, Rolla, MO, United States; Smithsonian Tropical Research Institute, Panamá, Panama; Institut des Sciences de l'Evolution de Montpellier, Université de Montpellier, Montpellier, France
推荐引用方式 GB/T 7714	Cárdenas D.,Jaramillo C.,Oboh-Ikuenobe F.. Early Miocene marine palynology of the Colombian Caribbean Margin: biostratigraphic and paleoceanographic implications[J],2020,558.
APA	Cárdenas D.,Jaramillo C.,&Oboh-Ikuenobe F..(2020).Early Miocene marine palynology of the Colombian Caribbean Margin: biostratigraphic and paleoceanographic implications.Palaeogeography, Palaeoclimatology, Palaeoecology,558.
MLA	Cárdenas D.,et al."Early Miocene marine palynology of the Colombian Caribbean Margin: biostratigraphic and paleoceanographic implications".Palaeogeography, Palaeoclimatology, Palaeoecology 558(2020).