DOI: 10.1016/j.palaeo.2016.02.043
论文题名: Biostratigraphy and paleoenvironments of the Late Oligocene in the north-western Transylvanian Basin revealed by the foraminifera assemblages
作者: Székely S.-F. ; Filipescu S.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2016
卷: 449 起始页码: 484
结束页码: 509
语种: 英语
英文关键词: Foraminifera
; Oligocene
; Paleoclimate
; Paleoecology
; Paleoenvironment
; Transylvanian Basin
英文摘要: The paleoenvironmental evolution and biostratigraphy of the Oligocene Vima Formation from the north-western Transylvanian Basin (Maramures county, Romania) is presented based on planktonic and benthic foraminiferal assemblages. The deposits were assigned to late Rupelian-early Chattian ages, more precisely the Globigerina angulisuturalis - Chiloguembelina cubensis CRZ (O4) and Paragloborotalia opima HOZ (O5) Biozones. The ecological preference of benthic foraminifera and statistical treatment of the raw data set were used to identify relationships between assemblages and reconstruct the ancient environments. Paleobathymetrical estimates indicate a deposition of the sediments in outer shelf to upper bathyal settings. The shelf is characterized by alternating well oxygenated bottom waters and poor oxygen content indicated by low-oxygen tolerant taxa. The upper bathyal assemblages dominated by tubular agglutinated foraminifera suggest oligotrophic environments periodically disturbed by turbidite currents, while the whole agglutinated communities suggest undersaturated bottom waters in respect to calcium-carbonate and possible depletion in oxygen content due to water column stratification. Paleoclimatic reconstructions based on planktonic foraminifera suggest cool to temperate surface water temperatures with boreal influences. The younger deposits of the Fântânele section indicate a warming trend at the surface waters. The aggradational to progradational stacking pattern of the identified high-frequency sequences suggest a high stand systems tract under the control of the regional tectonics. © 2016 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68471
Appears in Collections: 过去全球变化的重建
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作者单位: Babes-Bolyai University, Faculty of Biology and Geology, Department of Geology, Str. Kogălniceanu 1, Cluj Napoca, Romania
Recommended Citation:
Székely S.-F.,Filipescu S.. Biostratigraphy and paleoenvironments of the Late Oligocene in the north-western Transylvanian Basin revealed by the foraminifera assemblages[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2016-01-01,449