DOI: 10.1016/j.palaeo.2014.03.031
论文题名: Estuarine foraminifera record Holocene stratigraphic changes and Holocene climate changes in ENSO and the North American monsoon: Baffin Bay, Texas
作者: Buzas-Stephens P. ; Livsey D.N. ; Simms A.R. ; Buzas M.A.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2014
卷: 404 起始页码: 44
结束页码: 56
语种: 英语
英文关键词: Baffin bay
; El niño-southern oscillation
; Foraminifera
; Holocene climate change
; North american monsoon
; Texas
英文摘要: During the last Quaternary sea level fall (120- ka), Baffin Bay was formed by the down-cutting of the Los Olmos, San Fernando, and Petronila Creeks of south Texas. When sea level rose, this incised valley was then filled with mixed siliciclastic/carbonate sediments that record coastal environmental change over the past 10. ky. Previous sedimentological and seismic analysis shows that Baffin Bay contains atypical depositional environments as a result of its semi-arid climate setting and isolation from the Gulf of Mexico. Three prominent stratigraphic surfaces can be recognized within the bay deposits, and are chronostratigraphically constrained using radiocarbon dates. The purpose of the present study is to use foraminifera to create a separate account of change and to determine if foraminiferal data corroborate sedimentological evidence for sea level and climate fluctuations. Foraminifera were sampled at 20. cm intervals from a 14.4. m dated core and from surface and subsurface sediments of five cores along a dip transect. Multiple discriminate analysis was used to compare sections of the core by species proportions, and clearly delineates three different foraminiferal communities: deltaic, open-bay, and hypersaline. Breaks between these communities coincide with two of the surfaces observed in the core, one at about 8.0. ky and the other around 5.5. ky. Rapid sea level rise at the 8.0. ky flooding surface corresponds with a shift from a deltaic to an open-bay foraminiferal assemblage, while faunal change across the 5.5. ky surface is due to the formation of a large barrier island (Padre Island) and the onset of more arid climate conditions. Prior to the isolation of Baffin Bay at 5.5. ky, foraminiferal assemblages do not correspond to climate change records, perhaps because open circulation with the Gulf of Mexico tempered regional climate effects on bay salinity. After 5.5. ky, changes in foraminiferal assemblages correspond to independently derived records of the El Niño-Southern Oscillation and North American monsoon. Foraminiferal analysis supports sedimentological interpretations in that assemblages and sediments track climate change. © 2014 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69341
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Geosciences, Midwestern State University, Wichita Falls, TX 76308, United States; Earth Science Department, University of California, Santa Barbara, CA 93106, United States; Department of Paleobiology, Smithsonian Institution, Washington, DC 20560, United States
Recommended Citation:
Buzas-Stephens P.,Livsey D.N.,Simms A.R.,et al. Estuarine foraminifera record Holocene stratigraphic changes and Holocene climate changes in ENSO and the North American monsoon: Baffin Bay, Texas[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2014-01-01,404