Sedimentology of a debris-rich, perhumid valley glacier margin in the Rakaia Valley, South Island, New Zealand

Hyatt, Olivia M., Shulmeister, James, Evans, David J. A., Thackray, Glenn D. and Rieser, Uwe (2012) Sedimentology of a debris-rich, perhumid valley glacier margin in the Rakaia Valley, South Island, New Zealand. Journal of Quaternary Science, 27 7: 699-712. doi:10.1002/jqs.2556


Author Hyatt, Olivia M.
Shulmeister, James
Evans, David J. A.
Thackray, Glenn D.
Rieser, Uwe
Title Sedimentology of a debris-rich, perhumid valley glacier margin in the Rakaia Valley, South Island, New Zealand
Journal name Journal of Quaternary Science   Check publisher's open access policy
ISSN 0267-8179
1099-1417
Publication date 2012-10-01
Year available 2012
Sub-type Article (original research)
DOI 10.1002/jqs.2556
Open Access Status Not yet assessed
Volume 27
Issue 7
Start page 699
End page 712
Total pages 14
Place of publication West Sussex, United Kingdom
Publisher John Wiley & Sons
Language eng
Subject 1201 Arts and Humanities (miscellaneous)
1901 Earth and Planetary Sciences (miscellaneous)
1911 Palaeontology
Abstract The sedimentology and stratigraphy of a multi-phase glaciation sequence dating to Marine Isotope Stage 6 in the Rakaia Valley, South Island, New Zealand, is presented. This outcrop presents an example of the depositional signature of an end member of temperate valley glaciation, where voluminous sediment supply in a tectonically active setting combines with high annual temperatures and low seasonality to generate significant year-round glacifluvial activity. Such glacial systems produce geological-climatic units that are dominated by thick sequences of aggradational gravels and proglacial lake sediments trapped behind outwash heads during deglaciation. At Bayfields Cliff, outwash sequences record an oscillating glacier margin marked by a sequence of glacier-fed, Gilbert-type deltas. The deltas are cut by numerous small-scale, syndepositional, normal faults indicating both loss of glacier support and melt-out of buried ice. A larger-scale thrust fault system reflects late-stage ice overrun. Braid plain gravels and chaotic disturbed glacial lake sediments are also recorded. A notable feature of these systems is the virtual absence of till in an environment with much other evidence for proximal ice. Cumulatively we regard these sediment-landform associations as diagnostic of debris-laden, perhumid, temperate valley glacier systems.
Keyword Geosciences, Multidisciplinary
Paleontology
Geology
Paleontology
GEOSCIENCES, MULTIDISCIPLINARY
PALEONTOLOGY
Q-Index Code C1
Q-Index Status Provisional Code
Grant ID UOC303
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Geography, Planning and Environmental Management Publications
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Created: Thu, 11 Apr 2013, 04:11:34 EST by Claire Lam on behalf of School of Geography, Planning & Env Management