DOI: 10.1016/j.quascirev.2012.10.041
Scopus记录号: 2-s2.0-84870949280
论文题名: Geochronologic evidence for a possible MIS-11 emergent barrier/beach-ridge in southeastern Georgia, USA
作者: Markewich H.W. ; Pavich M.J. ; Schultz A.P. ; Mahan S.A. ; Aleman-Gonzalez W.B. ; Bierman P.R.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2013
卷: 60 起始页码: 49
结束页码: 75
语种: 英语
英文关键词: 10Be paleosol residence-time
; Coastal evolution
; Marine isotope stage 11
; Optically stimulated luminescence
; Pleistocene
; Southeast Atlantic Coastal Plain
Scopus关键词: <sup>10</sup>Be paleosol residence-time
; Coastal evolution
; Coastal plain
; Marine isotope stages
; Optically stimulated luminescence
; Pleistocene
; Beryllium
; Beryllium deposits
; Coastal engineering
; Isotopes
; Luminescence
; Mixing
; Sea level
; Stratigraphy
; Submarine geology
; Deposits
; beach
; beach morphology
; beryllium isotope
; coastal evolution
; coastal plain
; estuarine sediment
; geochronology
; marine isotope stage
; Miocene
; paleosol
; Pleistocene
; residence time
; shoreline
; Effingham County [Georgia]
; Georgia
; Ogeechee River
; Savannah River
; United States
英文摘要: Predominantly clastic, off-lapping, transgressive, near-shore marine sediment packages that are morphologically expressed as subparallel NE-trending barriers, beach ridges, and associated back-barrier areas, characterize the near-surface stratigraphic section between the Savannah and the Ogeechee Rivers in Effingham County, southeastern Georgia. Each barrier/back-barrier (shoreline) complex is lower than and cut into a higher/older complex. Each barrier or shoreline complex overlies Miocene strata. No direct age data are available for these deposits. Previous researchers have disagreed on their age and provenance. Using luminescence and meteoric beryllium-10 (10Be) inventory analyses, we estimated a minimum age for the largest, westernmost, morphologically identifiable, and topographically-highest, barrier/beach-ridge (the Wicomico shoreline barrier) and constrained the age of a suite of younger barrier/beach-ridges that lie adjacent and seaward of the Wicomico shoreline barrier.At the study site, the near-shore marine/estuarine deposits underlying the Wicomico shoreline barrier are overlain by eolian sand and an intervening zone-of-mixing. Optically stimulated luminescence (OSL) data indicate ages of ≤43 ka for the eolian sand and 116 ka for the zone-of-mixing. Meteoric 10Be and pedostratigraphic data indicate minimum residence times of 33.4 ka for the eolian sand, 80.6 ka for the zone-of-mixing, and 247 ka for the paleosol. The combined OSL and 10Be age data indicate that, at this locality, the barrier/beach ridge has a minimum age of about 360 ka. This age for the Wicomico shoreline-barrier deposit is the first for any Pleistocene near-shore marine/estuarine deposit in southeast Georgia that is conclusively older than 80 ka. The 360-ka minimum age is in agreement with other geochronologic data for near-coastline deposits in Georgia and South Carolina. The geomorphic position of this barrier/beach-ridge is similar to deposits in South Carolina considered to be ∼450 ka to >1 Ma. The age and geomorphic data for Georgia and South Carolina possibly suggest the presence of MIS-11 (∼420-360 ka) shoreline deposits between 15 m and 28 m above present sea level in the Southeastern Atlantic Coastal Plain. © 2012. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60736
Appears in Collections: 过去全球变化的重建
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作者单位: U.S. Geological Survey, 3039 Amwiler Rd., Ste. 130, Atlanta, GA 30360-2824, United States; U.S. Geological Survey, MS 926A National Center, 12201 Sunrise Valley Drive, Reston, VA 20192, United States; U.S. Geological Survey, Denver Federal Center, Box 25046, MS 974, Denver, CO 80225-0046, United States; Department of Geology, University of Vermont, Delehanty Hall, Trinity Campus, 180 Colchester Ave., Burlington, VT 05405-1758, United States
Recommended Citation:
Markewich H.W.,Pavich M.J.,Schultz A.P.,et al. Geochronologic evidence for a possible MIS-11 emergent barrier/beach-ridge in southeastern Georgia, USA[J]. Quaternary Science Reviews,2013-01-01,60