Universität zu Köln

May, Simon Matthias, Hoffmeister, Dirk ORCID: 0000-0002-8178-557X, Wolf, Dennis and Bubenzer, Olaf (2019). Zebra stripes in the Atacama Desert revisited - Granular fingering as a mechanism for zebra stripe formation? Geomorphology, 344. S. 46 - 60. AMSTERDAM: ELSEVIER. ISSN 1872-695X

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Abstract

Although a number of studies have pointed out the remarkable slowness of Earth surface processes in the Atacama Desert, process mechanisms under such extremely limited water availability are poorly understood, and process rates remain unknown. This paper revisits the discussion on the formation of the prominent Atacama-specific hillslope zebra (stone) stripes, previously interpreted to result from palaeo-overland flow (Owen et al., 2013). Compared to this study, our data document different stripe characteristics with regard to stripe form and orientation as well as sorting- and bedding-patterns of stripe-confining surface gravel units. We found a remarkable form-concordance between zebra stripes and deposits from experiments on segregation-induced granular fingering. Hence, we propose a combination of seismic shaking and instantaneous dry granular free surface flows as the key mechanism for zebra stripe formation. Our findings underline the potential significance of seismicity in shaping Atacama landscapes, which bear important analogies to extraterrestrial surfaces. (C) 2019 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code May, Simon Matthias UNSPECIFIED UNSPECIFIED UNSPECIFIED Hoffmeister, Dirk UNSPECIFIED orcid.org/0000-0002-8178-557X UNSPECIFIED Wolf, Dennis UNSPECIFIED UNSPECIFIED UNSPECIFIED Bubenzer, Olaf UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-130028
DOI:	10.1016/j.geomorph.2019.07.014
Journal or Publication Title:	Geomorphology
Volume:	344
Page Range:	S. 46 - 60
Date:	2019
Publisher:	ELSEVIER
Place of Publication:	AMSTERDAM
ISSN:	1872-695X
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language NORTHERN CHILE; HYPERARID-ATACAMA; LANDSCAPE EVOLUTION; BANDED VEGETATION; MOJAVE-DESERT; RECORD; SOIL; DEPOSITS; ARIDITY; ORIGIN Multiple languages Geography, Physical; Geosciences, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/13002