DOI: 10.1016/j.quascirev.2018.07.019
Scopus记录号: 2-s2.0-85053853660
论文题名: Wolfe Creek Crater: A continuous sediment fill in the Australian Arid Zone records changes in monsoon strength through the Late Quaternary
作者: Miller G.H. ; Magee J.W. ; Fogel M.L. ; Wooller M.J. ; Hesse P.P. ; Spooner N.A. ; Johnson B.J. ; Wallis L.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2018
卷: 199 起始页码: 108
结束页码: 125
语种: 英语
Scopus关键词: Arid regions
; Atmospheric thermodynamics
; Debris
; Dust
; Luminescence
; Precipitates
; Sand
; Sedimentology
; Sediments
; Stream flow
; Australian summer monsoons
; Geophysical surveys
; Last Glacial Maximum
; Marine isotope stages
; Optically stimulated luminescence
; Regional groundwater
; Sediment properties
; Sedimentary records
; Groundwater
; arid region
; carbon isotope
; clay soil
; crater
; depocenter
; encrustation
; eolian deposit
; fill
; geophysical survey
; groundwater
; gypsum
; Holocene
; Last Glacial Maximum
; marine isotope stage
; monsoon
; precipitation (chemistry)
; Quaternary
; sandy clay
; sandy soil
; sediment analysis
; Australia
英文摘要: A bolide that impacted NW Australia during the Late Quaternary left a circular depression more than 100 m deep and nearly a kilometer in diameter, with a crater rim ∼30 m above the regional terrain. The resultant crater is a window into the regional water table. The surface of the contemporary central pan is 25 m below the adjacent terrain, coincident with the late Holocene regional water table modified by local evaporative processes. Shielded from aeolian deflation by the crater rim, the central depression has slowly filled with dust, sand, and chemical precipitates, estimated to be 20–100 m thick based on geophysical surveys, one of the few continuous depocenters in the Australian Arid Zone. The nature of the crater's sediment fill is controlled by interactions between the water table, primarily in response to changes in summer monsoon rain, changes in the delivery of sand and dust to the crater by the prevailing easterly winds, and the level of the sedimentary fill surface. Optically Stimulated Luminescence (OSL) and 14C dates constrain an age model indicating the upper 10 m of sediment fill recovered from the central pan span the past ∼60 ka. The lowest 3 m consist of clayey sand deposited in perennial water during Marine Isotope Stage (MIS) 3. The water table subsequently dropped rapidly ∼35 ka and remained more than 7 m below the late Holocene level through most of MIS 2, during which 2 m of sandy clay was deposited on a dry crater floor, confirming a dry and dusty Last Glacial Maximum (LGM) climate. By 14 ka a rising water table intersected the crater surface, modifying the upper 50 cm of LGM sediment, and syndepositionally modifying another 60 cm of subsequent sandy clay deposition. Aeolian sediment delivery effectively ceased ∼13 ka, and the upper 4.8 m is a gypsum-dominated precipitate, which initially accumulated rapidly, before equilibrating with the late Holocene water table shortly after 6 ka. Lacustrine carbonate encrustations on rocks at the base of the crater wall and ∼4 m above the central pan with 14C ages >40 ka document a time when regional groundwater maintained a water body in the crater 3.5–4.5 m above the modern groundwater level. The crater wall deflected the prevailing easterly winds, creating a horseshoe-dune extending westerly on both sides of the crater, with an extension rate of 35 m ka−1. An augered hole through the northern dune revealed 10 m of sediment overlying ferricrete. The lowest meter is a mixture of broken ferricrete and sand that we interpret to be debris from the bolide impact. Three OSL dates through the dune project an age for the debris-dune contact of 120 ± 10 ka. Changes in physical properties and bulk sediment δ13C through the 9 m of aeolian sediment indicate the lowest 1.8 m was deposited during MIS 5 (120–85 ka), under a uniformly wetter climate than present. The overlying 4.3 m of sediment was deposited between 85 and 14 ka (MIS 4, 3, 2) and exhibits transitional characteristics between the lower unit and the upper 3.8 of sand, which was deposited primarily during the Holocene. Large changes in the regional water table occurred over the past 60 ka, including an LGM water table persistently ≥7 m lower than late Holocene levels, and 3.5–4.5 m higher prior to 40 ka, plausibly in MIS 5, indicative of a stronger Australian Summer Monsoon than at any time subsequently. Age models and sediment properties from the two sedimentary records indicate the crater was formed >60 ka and most likely ∼120 ka, more recently than previous estimates. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112028
Appears in Collections: 气候减缓与适应
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作者单位: INSTAAR and Department of Geological Sciences, University of Colorado, Boulder, CO 80309, United States; Research School of Earth Sciences, Australian National University, Acton, ACT 0200, Australia; Dept. of Earth Science, University of California Riverside, Riverside, CA, United States; Water and Environmental Research Center, Institute of Northern Engineering, University of Alaska Fairbanks, Fairbanks, AK, United States; Alaska Stable Isotope Facility, School of Fisheries and Ocean Sciences, University of Alaska Fairbanks, Fairbanks, AK, United States; Department of Environmental Sciences, Macquarie University, Sydney, NSW, Australia; Institute for Photonics & Advanced Sensing and School of Physical Sciences, University of Adelaide, Adelaide, 5005, Australia; Defense Science & Technology Group, Edinburgh, SA 5111, Australia; Dept. of Geology, Bates College, Lewiston, ME 04240, United States; Nulungu Research Institute, University of Notre Dame Australia, PO Box 2287, Broome, WA 6725, Australia
Recommended Citation:
Miller G.H.,Magee J.W.,Fogel M.L.,et al. Wolfe Creek Crater: A continuous sediment fill in the Australian Arid Zone records changes in monsoon strength through the Late Quaternary[J]. Quaternary Science Reviews,2018-01-01,199