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(Article of periodic en Anglais - 2013)

Document title

A relict pronival (protalus) rampart in the Tararua Range, North Island, New Zealand

Authors(s) and Affiliation(s)

BROOK M.S. (1) ; WILLIAMS J. (1) ;
(1) Earth Sciences, Inst. of Natural ressources, Massey Univ., Palmerston North, NOUVELLE-ZELANDE

Abstract

Debris ridges in New Zealand are routinely assumed to be "moraines" and used as key Southern Hemisphere paleoclimatic sites without detailed evaluation of ridge origin. Here the AA. assess the origin of a debris ridge adjacent to Dundas Ridge in the Tararua Range, through measurements of ridge morphology and sedimentary properties. The single ridge morphology precludes a protalus rock glacier origin, while the lack of a broad hillslope scar and debris apron beyond the ridge excludes a landslide origin. Instead, the AA. interpret the ridge as a pronival (protalus) rampart formed by supranival debris supply–from the ca. 200 m-high southeastern slopes of Dundas Ridge–across a snowbed. Re-distribution of snow by prevailing westerlies from Mt Dundas Ridge into the basin would have nourished the snowbed, which is likely to have formed during the interval 24-18 ka BP, when a minor alpine-style glaciation affected sectors of the Tararua Range

Source

Article of periodic

published at : Permafrost and periglacial processes / ISSN 1045-6740 / CODEN PEPPED

Editor : Wiley, Chichester - ROYAUME-UNI (1990)

Millesime : 2013, vol. 24, no1 [pp. 67-74]

Bibliographic references : 1 p.

Collation : 4 fig., 2 tabl.

Language

Anglais

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/ppp.1759

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2013
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