DOI: 10.1016/j.palaeo.2016.12.009
论文题名: Cretaceous (Albian to Cenomanian) biostratigraphic, paleogeographic and paleoenvironmental reconstruction of the northern Western Interior Sea: Yukon, Canada
作者: Quesnel A. ; Schröder-Adams C.J. ; Davis W.J.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2017
卷: 468 起始页码: 453
结束页码: 472
语种: 英语
英文关键词: Biostratigraphy
; Cretaceous
; Geochronology
; Paleogeography
; Western Interior Sea
; Yukon
英文摘要: The Eagle Plain region, located in the northeastern Yukon Territory, Canada, forms a northern segment of the Cretaceous Western Interior Sea. Its preserved mid-Cretaceous strata (Whitestone River Formation and Eagle Plain Group) document an active structural regime, sea-level fluctuations, paleoecosystem changes and the paleogeographic evolution south of the gateway to the Polar Sea. This study integrates foraminiferal assemblages recovered from two wells (Molar P-34 and Ellen C-24) and one Late Albian bentonite age with well log signatures and previously established outcrop data. The proposed biostratigraphic framework correlates well between both wells and with the fauna observed in outcrops. Three biostratigraphic zones are recognized allowing for regional correlations; the Early Albian Gaudryina tailleuri Zone, the Middle to early Late Albian Gaudryina canadensis Zone, and the latest Albian Miliammina manitobensis Zone. A new 206Pb/238U age of 105.56 ± 0.25 Ma places the upper Whitestone River Formation into the Late Albian. Foraminiferal morphogroups and their relative proportions allow for paleoenvironmental reconstruction, including oxygen and nutrient conditions. The Ellen well represents deposition in a fully marine, well oxygenated proximal shelf setting during the Early to early Late Albian, resulting in the Whitestone River Formation. The Molar well represents a deep water, offshore setting with increased accommodation space marked by an increase in tubular suspension feeders, demonstrating a northwestward deepening of the basin. Foraminiferal assemblages of the Albian Whitestone River Formation reflect the widely recognized depositional cycles of the Western Interior Sea (Moosebar, Hulcross, Joli Fou and Mowry seas). During Albian time the northern gateway between the Polar and Western Interior seas was widely inundated, contrasting with an either short lived closure or severely restricted phase during the Albian/Cenomanian boundary interval. © 2016 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/67953
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Earth Sciences, Carleton University, 1125 Colonel By Drive, Ottawa, Ontario, Canada; Department of Earth Sciences, Carleton University, 2115 Herzberg Laboratories, 1125 Colonel By Drive, Ottawa, Ontario, Canada; Natural Resources Canada, Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario, Canada
Recommended Citation:
Quesnel A.,Schröder-Adams C.J.,Davis W.J.. Cretaceous (Albian to Cenomanian) biostratigraphic, paleogeographic and paleoenvironmental reconstruction of the northern Western Interior Sea: Yukon, Canada[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2017-01-01,468