DOI: 10.1016/j.quascirev.2013.09.025
Scopus记录号: 2-s2.0-84899899051
论文题名: The late Quaternary environmental evolution of marine Arctic Canada: Barrow Strait to Lancaster Sound
作者: Pieńkowski A.J. ; England J.H. ; Furze M.F.A. ; MacLean B. ; Blasco S.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2014
卷: 91 起始页码: 184
结束页码: 203
语种: 英语
英文关键词: Deglaciation
; Environmental change
; Holocene
; Late Wisconsinan
; Northwest Passage
; Palaeoenvironment
; Sea ice
Scopus关键词: Bioactivity
; Sea ice
; Submarine geology
; Deglaciations
; Environmental change
; Holocenes
; Late Wisconsinan
; Northwest Passage
; Palaeoenvironment
; Sediments
; Dinophyceae
; Foraminifera
; Neogloboquadrina pachyderma
; Ostracoda
; Portlandia
英文摘要: A marine sediment core from the east-central Canadian Arctic Archipelago (Core 86027-154; 74° 22.01'N 89° 51.26'W; 329m water depth), studied by a multiproxy approach [lithostratigraphy, biogeochemistry, micropalaeontology (dinoflagellate cysts, other non-pollen palynomorphs, benthic and planktonic foraminifera, ostracods)], and encompassing 14 AMS 14C dates, provides valuable insights into regional deglacial to Holocene palaeoenvironments. Six palaeoenvironmental zones are recognized, based on prominent changes in the litho- and biostratigraphy. The waterlain diamicton of Zone I records immediate deglaciation, being derived from lift-off and calving of previously grounded glacial ice. Though deglacial timing is complicated by the sparsity of dating materials and the Portlandia Effect, age-depth model extrapolation places deglaciation at 11.54calkaBP. Zone II (11.5-11.0calkaBP) represents a distinct progression from initially ice-proximal to increasingly ice-distal conditions, interrupted by an intervalofpervasive sea-ice (11.4-11.2calkaBP). Noteworthy biological activity commences in Zone III (11.0-9.7calkaBP) with a prominent signal of planktonic foraminifera (Neogloboquadrina pachyderma). This likely signifies penetration of deeper, Atlantic-derived water through the central Canadian Arctic Archipelago upon deglaciation, facilitated by the greater, glacioisostatically-induced water depths(+80m), and implies separation of Laurentide and Innuitian ice sheets by ~11.0calkaBP. Zone IV(9.7-7.2calkaBP) records ameliorated, biologically favourable conditions with reduced seasonalsea-iceaccompanied by high microfossil species diversity and the presence of subpolar taxa. Zone V (7.2-6.5calkaBP) signals the exclusion of Atlantic-derived water, concomitant with increasing sea-ice, simultaneously representing the termination of the dynamic deglacial to early Holocene environments (zones I-IV). Conditions similar to modern typified by uniform sediment characteristics, present-day microfossil assemblage structures, and sparse benthic foraminifera were established by 5.6calkaBP (Zone VI). © 2013 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60314
Appears in Collections: 过去全球变化的重建
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作者单位: School of Ocean Sciences, College of Natural Sciences, Bangor University, Menai Bridge, Anglesey LL59 5AB, United Kingdom; Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB T6G 2E3, Canada; Earth and Planetary Sciences, Department of Physical Sciences, MacEwan University, P.O. Box 1796, Edmonton, AB T5J 2P2, Canada; Geological Survey of Canada-Atlantic, Box 1006, Dartmouth, NS B2Y 4A2, Canada
Recommended Citation:
Pieńkowski A.J.,England J.H.,Furze M.F.A.,et al. The late Quaternary environmental evolution of marine Arctic Canada: Barrow Strait to Lancaster Sound[J]. Quaternary Science Reviews,2014-01-01,91