DOI: 10.1016/j.quascirev.2016.03.024
Scopus记录号: 2-s2.0-84961990942
论文题名: Using palynology to re-assess the Dead Sea laminated sediments - Indeed varves?
作者: López-Merino L. ; Leroy S.A.G. ; Eshel A. ; Epshtein V. ; Belmaker R. ; Bookman R.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2016
卷: 140 起始页码: 49
结束页码: 66
语种: 英语
英文关键词: Air-borne pollen
; Aragonite
; Dead Sea
; Flash-flood events
; Laminated sediments
; Reworked pollen
Scopus关键词: Carbon
; Deposition
; Floods
; Fungi
; Grain size and shape
; Multivariant analysis
; Seawater
; Sediments
; Air borne
; Aragonite
; Dead sea
; Flash flood
; Laminated sediments
; Reworked pollen
; Carbonate minerals
; aragonite
; carbon balance
; flash flood
; fungus
; Holocene
; lacustrine deposit
; lamination
; palynology
; reworking
; runoff
; spore
; varve
; watershed
; Dead Sea
英文摘要: Lacustrine laminated sediments are often varves representing annual rhythmic deposition. The Dead Sea high-stand laminated sections consist of mm-scale alternating detrital and authigenic aragonite laminae. Previous studies assumed these laminae were varves deposited seasonally. However, this assumption has never been robustly validated. Here we report an examination of the seasonal deposition of detrital-aragonite couplets from two well-known Late Holocene laminated sections at the Ze'elim fan-delta using palynology and grain-size distribution analyses. These analyses are complemented by the study of contemporary flash-flood samples and multivariate statistical analysis. Because transport affects the pollen preservation state, well-preserved (mostly) air-borne transported pollen was analysed separately from badly-preserved pollen and fungal spores, which are more indicative of water transport and reworking from soils. Our results indicate that (i) both detrital and aragonite laminae were deposited during the rainy season; (ii) aragonite laminae have significantly lower reworked and fungal spore concentrations than detrital and flash-flood samples; and (iii) detrital laminae are composed of recycling of local and distal sources, with coarser particles that were initially deposited in the Dead Sea watershed and later transported via run-off to the lake. This is in line with previous carbon balance studies that showed that aragonite precipitation occurs after the massive input of TCO2 associated with run-off episodes. Consequently, at least for the Holocene Ze'elim Formation, laminated sediments cannot be considered as varves. Older Quaternary laminated sequences should be re-evaluated. © 2016 The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59606
Appears in Collections: 过去全球变化的重建
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作者单位: Institute of Environment, Health and Societies, Brunel University London, Uxbridge, United Kingdom; The Ted Arisson Airborne Allergens Monitoring Laboratory, Tel Aviv University, Tel Aviv, Israel; Dr Strauss Department of Marine Geosciences, Charney School of Marine Sciences, University of Haifa, Mount Carmel, Haifa, Israel
Recommended Citation:
López-Merino L.,Leroy S.A.G.,Eshel A.,et al. Using palynology to re-assess the Dead Sea laminated sediments - Indeed varves?[J]. Quaternary Science Reviews,2016-01-01,140