Universität zu Köln

Guyez, Anne ORCID: 0000-0003-3246-8700, Bonnet, Stephane, Reimann, Tony ORCID: 0000-0001-7948-5159, Carretier, Sebastien and Wallinga, Jakob (2022). Illuminating past river incision, sediment source and pathways using luminescence signals of individual feldspar grains (Rangitikei River, New Zealand). Earth Surf. Process. Landf., 47 (8). S. 1952 - 1972. HOBOKEN: WILEY. ISSN 1096-9837

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Abstract

Single-grain post-infrared infrared stimulated luminescence (SG-pIRIR) of feldspar has recently been introduced as a method to date Quaternary deposits. The method is particularly appropriate for fluvial deposits that cannot be dated by more conventional quartz optically stimulated luminescence dating and that are heterogeneously bleached (i.e. where only part of the grains is exposed to sufficient light to remove the full luminescence signal). Besides age estimation, single grain equivalent dose (D-e) distributions also reflect the variable bleaching degree and origins of grains. Thereby, the SG-pIRIR signal offers a valuable tool to reconstruct sediment pathways. This study builds upon these ideas and develops a dual aspect that combined river terrace dating and SG-pIRIR sediment pathway reconstruction for fluvial deposits in terraces and modern river floodplain along the Rangitikei River (RR), New Zealand. We found that the RR last aggrading phase (17.4 +/- 1.9 ka to 11.6 +/- 1.5 ka) was followed by a first phase of fast incision related to knickpoint retreat followed by a steady incision and widening of the RR canyon. The D-e distribution of fluvial deposits varies accordingly, due in particular to variable input of bedrock particles with saturated pIRIR signal from landsliding of valley flanks. Our study illustrates that the SG-pIRIR approach is well suited to date terraces and shows how SG-pIRIR D-e distributions provide proxies to reconstruct sediment sources and pathways.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Guyez, Anne UNSPECIFIED orcid.org/0000-0003-3246-8700 UNSPECIFIED Bonnet, Stephane UNSPECIFIED UNSPECIFIED UNSPECIFIED Reimann, Tony UNSPECIFIED orcid.org/0000-0001-7948-5159 UNSPECIFIED Carretier, Sebastien UNSPECIFIED UNSPECIFIED UNSPECIFIED Wallinga, Jakob UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-679748
DOI:	10.1002/esp.5357
Journal or Publication Title:	Earth Surf. Process. Landf.
Volume:	47
Number:	8
Page Range:	S. 1952 - 1972
Date:	2022
Publisher:	WILEY
Place of Publication:	HOBOKEN
ISSN:	1096-9837
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language NORTH-ISLAND; LANDSCAPE EVOLUTION; DENUDATION RATES; EROSION RATES; COSMOGENIC NUCLIDES; CHANNEL MORPHOLOGY; VIRTUAL VELOCITY; WANGANUI BASIN; WAIPAOA RIVER; MOJAVE RIVER Multiple languages Geography, Physical; Geosciences, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/67974