Universität zu Köln

Brill, Dominik ORCID: 0000-0001-8637-4641, Reimann, Tony, Wallinga, Jakob ORCID: 0000-0003-4061-3066, May, Simon Matthias ORCID: 0000-0001-6762-7500, Engel, Max ORCID: 0000-0002-2271-4229, Riedesel, Svenja ORCID: 0000-0003-2936-8776 and Brueckner, Helmut (2018). Testing the accuracy of feldspar single grains to date late Holocene cyclone and tsunami deposits. Quat. Geochronol., 48. S. 91 - 104. OXFORD: ELSEVIER SCI LTD. ISSN 1878-0350

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Abstract

Quartz is the preferred dosimeter for luminescence dating of Holocene sediments as optically stimulated luminescence (OSL) signals reset rapidly upon light exposure, and are stable over time. However, feldspar is required where quartz luminescence properties are inappropriate for dating, as is often the case in geologically young mountain ranges and areas with young volcanism. Here we aim to evaluate the potential of single grain feldspar luminescence dating applied to late Holocene cyclone and tsunami deposits, for which complete signal resetting can a priori not be guaranteed. To address potential problems of feldspar dating of such deposits associated with heterogeneous bleaching, remnant doses and anomalous fading, we use a low-temperature post infrared infrared stimulated luminescence protocol (pIRIR(150)) on single grains. For most samples, good agreement between fading corrected IR50 and non-fading corrected pIRIR(150) ages is observed. Both feldspar ages generally also show good agreement with age control provided by historical data and quartz luminescence ages. pIRIRiso remnant ages in modern analogue samples are shown to be < 50 years, indicating that dating accuracy might be negatively affected by insufficient signal zeroing only for sediments younger than similar to 500 years. As these minor remnant ages are interpreted as being caused by unbleachable luminescence residuals, slight age overestimation for young samples can be overcome by subtracting the remnant ages. The good agreement between pIRIR(150), IR50 and quartz ages, indicates that a significant number of grains must have experienced relatively complete signal resetting during or immediately prior to transport, as the three signals are known to bleach at different rates. Since light exposure during the event is expected to be limited, we deduce that a significant portion of the grains in the cyclone and tsunami deposits was already bleached prior to the event of interest. These well-bleached grains were likely eroded at the beach, while other grains with larger remnant ages probably originate from the shallow subtidal, coastal barriers or even further inland sources. Additional signal resetting during storm and tsunami transport is indicated by slightly younger quartz than feldspar ages for grains with incomplete pre-transport resetting that were eroded at the Holocene coastal barrier.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Brill, Dominik UNSPECIFIED orcid.org/0000-0001-8637-4641 UNSPECIFIED Reimann, Tony UNSPECIFIED UNSPECIFIED UNSPECIFIED Wallinga, Jakob UNSPECIFIED orcid.org/0000-0003-4061-3066 UNSPECIFIED May, Simon Matthias UNSPECIFIED orcid.org/0000-0001-6762-7500 UNSPECIFIED Engel, Max UNSPECIFIED orcid.org/0000-0002-2271-4229 UNSPECIFIED Riedesel, Svenja UNSPECIFIED orcid.org/0000-0003-2936-8776 UNSPECIFIED Brueckner, Helmut UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-170039
DOI:	10.1016/j.quageo.2018.09.001
Journal or Publication Title:	Quat. Geochronol.
Volume:	48
Page Range:	S. 91 - 104
Date:	2018
Publisher:	ELSEVIER SCI LTD
Place of Publication:	OXFORD
ISSN:	1878-0350
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language LUMINESCENCE SIGNALS; SHIZUOKA PREFECTURE; COASTAL LOWLAND; PACIFIC COAST; QUARTZ; SEDIMENTS; OSL; AUSTRALIA; SAMPLES; RECORD Multiple languages Geography, Physical; Geosciences, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/17003