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Dating Saharan dust deposits on Lanzarote (Canary Islands) by luminescence dating techniques and their implication for palaeoclimate reconstruction of NW Africa.

DOI zum Zitieren dieses Dokuments: https://doi.org/10.1029/2007GC001658
URN to cite this document: urn:nbn:de:bvb:703-opus-3960

Title data

von Suchodoletz, Hans ; Fuchs, Markus ; Zöller, Ludwig:
Dating Saharan dust deposits on Lanzarote (Canary Islands) by luminescence dating techniques and their implication for palaeoclimate reconstruction of NW Africa.
Bayreuth , 2008
DOI: https://doi.org/10.1029/2007GC001658

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Abstract

Lava flow dammed valleys (Vegas) on Lanzarote (Canary Islands) represent unique sediment traps, filled with autochthonous volcanic material and allochthonous Saharan dust. These sediments and the intercalated palaeosoil sediments document past environmental change of the last glacial-interglacial cycles, both on Lanzarote and in NW Africa. A reliable chronology must be established to use these sediment archives for palaeoclimate reconstructions. Owing to the lack of organic material and the limiting time range of the 14Cdating method, luminescence dating is the most promising method for these sediments. However, the fluvio-eolian character of these sediments is a major problem for luminescence dating, because these sediments are prone to insufficient resetting of the parent luminescence signal (bleaching) prior to sedimentation. To check for the best age estimates, we compare the bleaching behavior of (1) different grain sizes (coarse- versus fine-grain quartz OSL) and (2) different minerals (fine-grain feldspar IRSL versus fine-grain quartz OSL). The results show that owing to its bleaching characteristics, quartz is the preferable mineral for luminescence dating. On the basis of the fine- and coarse-grain quartz OSL age estimates, a chronostratigraphy up to 100 ka could be established. Beyond this age limit for OSL quartz, the chronostratigraphy could be extended up to 180 ka by correlating the vega sediments with dated marine sediment archives.

Further data

Item Type: Preprint, postprint
Additional notes (visible to public): Source: Geochemistry, Geophysics, and Geosystems (2008), Vol 9, Number 2,14 February 2008, Q02Q07
Keywords: Quartärgeomorphologie; Lumineszenzdatierung; Kanarische Inseln <Ost>; Staub; Sahara; ungenügende Bleichung; Saharan dust; luminescence dating; insufficient bleaching; Holocene; Middle and Late Pleistocene
DDC Subjects: 500 Science > 550 Earth sciences, geology
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Language: English
Originates at UBT: Yes
URN: urn:nbn:de:bvb:703-opus-3960
Date Deposited: 25 Apr 2014 10:51
Last Modified: 27 Mar 2019 13:25
URI: https://epub.uni-bayreuth.de/id/eprint/618

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