Zebra stripes in the Atacama Desert revisited – Granular fingering as a mechanism for zebra stripe formation?

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Title:Main Title: Zebra stripes in the Atacama Desert revisited – Granular fingering as a mechanism for zebra stripe formation?
Description: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 previous studies, 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 extra-terrestrial surfaces.
Identifier:10.1016/j.geomorph.2019.07.014 (DOI)
Responsible Party
Creators:Matthias May (Author), Dirk Hoffmeister (Author), Dennis Wolf (Author), Olaf Bubenzer (Author)
Funding Reference:Deutsche Forschungsgemeinschaft (DFG): CRC 1211: Earth - Evolution at the Dry Limit
Publisher:Elsevier
Publication Year:2019
Topic
CRC1211 Topic:Surface
Related Subprojects:Z2, C3, Z3
Subjects:Keywords: Geomorphology, Remote Sensing, Arid Zone
Geographic Information Topic:Geoscientific Information
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Filename:1-s2.0-S0169555X19302995-main1.pdf
Data Type:Text - Article
File Size:23 MB
Date:Accepted: 26.07.2019
Mime Type:application/pdf
Data Format:PDF
Language:English
Status:In Process
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Download Permission:Only Project Members
General Access and Use Conditions:According to the CRC1211DB data policy agreement.
Access Limitations:According to the CRC1211DB data policy agreement.
Licence:[CRC1211DB] Data policy agreement
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Publication Status:Accepted
Review Status:Peer reviewed
Publication Type:Article
Article Type:Journal
Source:Geomorphology
Number of Pages:57 (1 - 57)
Metadata Details
Metadata Creator:Dirk Hoffmeister
Metadata Created:26.07.2019
Metadata Last Updated:26.07.2019
Subproject:Z2
Funding Phase:1
Metadata Language:English
Metadata Version:V50
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