Quaternary Ostracoda and Foraminifera from the Pelotas Basin, southernmost Brazil: Assemblage variation in gas-hydrate bearing sediments

IF 1.3 4区地球科学 Q3 PALEONTOLOGY Micropaleontology Pub Date : 2022-01-01 DOI:10.47894/mpal.68.3.06

R. Maia, E. Piovesan, Geise de Santana dos Anjos-Zerfass, R. M. Melo

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引用次数: 2

Abstract

Late Quaternary ostracod and foraminifera assemblages from five piston cores in Pelotas Basin, southern Brazilian margin, were analyzed in this paper. The study revealed a diverse bathyal fauna of ostracods, with abundance of the genera Apatihowella, Cytheropteron and Cytherella, interspersed with peaks of allochthonous neritic faunas. Benthic foraminifera are represented mainly by the genera Bolivina, Bulimina, Cassidulina, Epistominella, Globobulimina, Globocassidulina, Nonion, Oridorsalis and Uvigerina. Biostratigraphic analysis of planktic foraminifera positioned the samples in Pleistocene-Holocene interval. The ostracod genera Paracytherois, Cytheropteron, Cytherella, Macropyxis and the species Krithe hunti, Krithe reversa, Henryhowella asperrima, Eucytherura fossapunctata, Rimacytheropteron longipunctatum, Apatihowella besnardi and Apatihowella convexa, and also the benthic foraminifera Bolivina, Bulimina, Nonion, Nonionellina, Oridorsalis, Uvigerina, Epistominella and Cassidulina are related to environments of gas hydrates and associated with a chemosynthetic community in eutrophic-mesotrophic environments.

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巴西最南部Pelotas盆地第四纪介形虫和有孔虫:含天然气水合物沉积物的组合变化

对巴西南部佩洛塔斯盆地5个柱状岩心的晚第四纪介形虫和有孔虫组合进行了分析。研究发现，该地区有丰富的介形类动物群，有丰富的Apatihowella属、Cytheropteron属和Cytherella属，并点缀着异域浅海动物群的高峰。底栖有孔虫属主要有Bolivina、Bulimina、Cassidulina、Epistominella、Globobulimina、Globocassidulina、Nonion、Oridorsalis和Uvigerina。浮游有孔虫的生物地层分析将样品定位在更新世-全新世区间。甲壳类动物有:Paracytherois、Cytheropteron、Cytherella、Macropyxis、Krithe hunti、Krithe reversa、Henryhowella asperrima、Eucytherura fossapunctata、Rimacytheropteron longipunctatum、Apatihowella besnardi和Apatihowella convexa;底栖有孔虫有:Bolivina、Bulimina、Nonion、Nonionellina、Oridorsalis、Uvigerina;Epistominella和Cassidulina与天然气水合物环境有关，并与富营养化-中营养化环境中的化学合成群落有关。

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来源期刊

Micropaleontology 地学-古生物学

CiteScore

3.20

自引率

6.70%

发文量

审稿时长

>12 weeks

期刊介绍： The Journal of Micropalaeontology (JM) is an established international journal covering all aspects of microfossils and their application to both applied studies and basic research. In particular we welcome submissions relating to microfossils and their application to palaeoceanography, palaeoclimatology, palaeobiology, evolution, taxonomy, environmental change and molecular phylogeny. Owned by The Micropalaeontological Society, the scope of the journal is broad, demonstrating the application of microfossils to solving broad geoscience issues.