DOI: 10.1016/j.gloplacha.2016.10.012
论文题名: Late Pleistocene aeolian dust provenances and wind direction changes reconstructed by heavy mineral analysis of the sediments of the Dehner dry maar (Eifel, Germany)
作者: Römer W. ; Lehmkuhl F. ; Sirocko F.
刊名: Global and Planetary Change
ISSN: 0921-8181
出版年: 2016
卷: 147 起始页码: 25
结束页码: 39
语种: 英语
英文关键词: Eifel
; Heavy minerals
; Late Pleistocene
; Maar lake sediments
; Paleoclimate
; Sedimentary archives
; Wind direction change
Scopus关键词: Mineral exploration
; Oxide minerals
; Sedimentary rocks
; Sedimentology
; Sediments
; Silicate minerals
; Stratigraphy
; Vegetation
; Eifel
; Heavy minerals
; Late Pleistocene
; Maar lake sediments
; Paleoclimates
; Sedimentary archives
; Wind directions
; Minerals
英文摘要: The study presents the results of a heavy mineral analysis from a 38 m long record of lacustrine Eifel maar sediments from a core section of the Dehner dry maar. The record encompasses the period from 29,000 to about 12,500 b2k. Statistical analyses enabled the distinction of local and regional source areas of aeolian material and revealed pronounced changes in the amounts of different heavy mineral species and corresponding changes in the grain size Index (GSI and CSI). The results indicate that during the early stages of MIS2 (39 to 30 m depth) aeolian sediments were supplied mostly from local sources. This period is characterized by low GSI and CSI ratios resulting from a reduced mobility of material due to a vegetation cover. The period between 23,000 and 12,900 b2k is characterized by a higher supply of heavy minerals from regional and more distant sources. Changes in the provenance areas are indicated in inverse relationships between zircon, rutile, tourmaline (ZRT) and carbonate particles. Shifts in the wind direction are documented in pronounced peaks of carbonate particles indicating easterly winds that have crossed the limestone basins in the Eifeler North South Zone. ZRT-group minerals on the other hand suggest a westerly source area from Palaeozoic clastic sedimentary rocks. The heavy mineral assemblage of the LGM section at 23,000 to 15,000 b2k displays a close correspondence with the stratigraphic relationships that have been obtained for the Landscape Evolution Zone 4 of the ELSA-Vegetation Stack of Sirocko et al. (2016). From the Heinrich 2 event onwards the analyses indicate an increasing degree of mixing of heavy minerals from various provinces. This suggests the existence of a presumably incomplete, thin cover of deflated loess-like sediments that has been repeatedly reworked on the elevated surfaces of the Eifel. © 2016 Elsevier B.V. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84993965211&doi=10.1016%2fj.gloplacha.2016.10.012&partnerID=40&md5=a8ccc8c81fc70df22495bc3675be3373
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/11588
Appears in Collections: 全球变化的国际研究计划 气候变化与战略
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作者单位: Department of Geography, RWTH (University) Aachen, Templergraben 55, Aachen, Germany
Recommended Citation:
Römer W.,Lehmkuhl F.,Sirocko F.. Late Pleistocene aeolian dust provenances and wind direction changes reconstructed by heavy mineral analysis of the sediments of the Dehner dry maar (Eifel, Germany)[J]. Global and Planetary Change,2016-01-01,147.