DOI: 10.1016/j.gloplacha.2012.04.004
论文题名: Paleoenvironmental evolution of the East Carpathian foredeep during the late Miocene-early Pliocene (Dacian Basin; Romania)
作者: Stoica M. ; Lazǎr I. ; Krijgsman W. ; Vasiliev I. ; Jipa D. ; Floroiu A.
刊名: Global and Planetary Change
ISSN: 0921-8354
出版年: 2013
卷: 103, 期: 1 起始页码: 135
结束页码: 148
语种: 英语
英文关键词: Biostratigraphy
; Carpathian foredeep
; Dacian basin
; Messinian
; Ostracods
; Paleoenvironment
; Paratethys
Scopus关键词: Carpathian foredeep
; Dacian basin
; Messinian
; Ostracods
; Paleo-environment
; Paratethys
; Dacian Basin
; Biostratigraphy
; Data integration
; Deposition
; Sea level
; Sedimentology
; Sediments
; Water levels
; Animals
; alluvial deposit
; bathymetry
; benthic foraminifera
; biostratigraphy
; depositional environment
; fossil record
; magnetostratigraphy
; Messinian
; micropaleontology
; mollusc
; nanofossil
; ostracod
; paleoecology
; paleoenvironment
; paleosalinity
; Paratethys
; photic zone
; planktonic foraminifera
; Pliocene
; sea level
; sedimentary sequence
; shallow water
; timescale
; forearc basin
; Miocene
; paleontology
; Black Sea
; Carpathian Foredeep
; Carpathians
; Dacic Basin
; Focsani Depression
; Mediterranean Sea
; Romania
; Vrancea
; Foraminifera
; Mollusca
; Odessia
; Ostracoda
; Paratethys
; Pontia
; Zanclea
英文摘要: The thick and continuous Mio-Pliocene sedimentary successions of the Focşani Depression in the Dacian Basin of Romania provide an excellent opportunity to study the paleoecological changes in the Eastern Paratethys during the time when the Mediterranean and Black Sea experienced major sea level fluctuations related to the closure and re-opening of the marine connection to the Atlantic Ocean during the Messinian Salinity Crisis. These successions form the basis of high-resolution magneto-biostratigraphic studies that allow a detailed correlation to the standard Geological Time Scale. Here, we analyze the paleoenvironmental evolution of the East Carpathian foredeep by integrating micro- and macropaleontological data and sedimentological analyses. The ostracod and mollusc fossil associations fromthe Râmnicu Sǎrat river section indicate that the late Maeotian depositional environment was characterized by shallow waters and littoral to fluvio-deltaic sediments. The Maeotian-Pontian boundary (6.04 Ma) is marked by a marine ingression, comprising benthic (agglutinated and calcareous) and planktonic (Streptochilus spp.) foraminifera and nanofossils. Following this marine ingression, the Lower Pontian (Odessian; 6.04-5.8Ma) fauna shows an increased bathymetry of the basin. The presence of ostracod species with eye tubercles indicates depositional environments within the photic zone (b100 m). The Middle Pontian (Portaferrian; 5.8-5.5 Ma) is marked by a widespread sea level lowering resulting in dominant fluvio-deltaic conditions. This ecostratigraphy demonstrates that the main Messinian sea-level draw down (at 5.6-5.5 Ma) occurred in mid-Portaferrian times. Paleoenvironmental indicators show that the water level in the Foçsani Depression dropped less than 100 mduring Mediterranean desiccation. The Dacian Basin remained filled with water, suggesting a positive hydrological balance for the region. This is compatible with the presence of a shallow barrier at Dobrogea (the Galati passage), separating the Dacian Basin fromthe Black Sea Basin during the late Miocene. The Portaferrian-Bosphorian boundary (5.5 Ma) ismarked by a second transgressive event, but this time without marine foraminifera. We conclude that the Dacian Basin formed a semi-isolated entity during the Portaferrian and experienced connectivity to the Black Sea domain during the Odessian and Bosphorian. © 2012 Elsevier B.V. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84878218063&doi=10.1016%2fj.gloplacha.2012.04.004&partnerID=40&md5=e03e0534eda9cabe188e37a303f3f941
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/11260
Appears in Collections: 全球变化的国际研究计划
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作者单位: Department of Geology, Faculty of Geology and Geophysics, Bucharest University, Bǎlcescu Bd. 1, Bucharest, 010041, Romania
Recommended Citation:
Stoica M.,Lazǎr I.,Krijgsman W.,et al. Paleoenvironmental evolution of the East Carpathian foredeep during the late Miocene-early Pliocene (Dacian Basin; Romania)[J]. Global and Planetary Change,2013-01-01,103(1).