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Origin and lateral migration of linear dunes in the Qaidam Basin of NW China revealed by dune sediments, internal structures, and optically stimulated luminescence ages, with implications for linear dunes on Titan: discussion

GSA Bulletin
By:  and 
https://doi.org/10.1130/B30780.1

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Abstract

Zhou et al. (2012) proposed that longitudinal dunes in the Qaidam Basin, China, formed like yardangs: by erosion into sediment that was not deposited by those dunes. Because erosion occurs on the upwind flanks of most migrating dunes (Rubin and Hunter, 1982, 1985), the key to demonstrating a yardang-like origin is to show that the dunes did not deposit the strata that they contain. Zhou et al. made this argument by proposing that:

  • (1) The dunes have not deposited cross-strata in the past 810 yr.

  • (2) Cross-bedding within the dunes was not deposited by the dunes on the present-day land surface, but rather by older dunes that had a different morphology.

  • (3) The present dunes are a later generation, “most likely of erosional origin similar to yardangs with orientations controlled by strikes of joints,” (p. 1147).

  • (4) Rates of deflation in the dune field have been extremely high for the past 810–2440 yr.

This commentary reviews these conclusions, reviews contradictory observations, and considers alternative interpretations.

Publication type Article
Publication Subtype Journal Article
Title Origin and lateral migration of linear dunes in the Qaidam Basin of NW China revealed by dune sediments, internal structures, and optically stimulated luminescence ages, with implications for linear dunes on Titan: discussion
Series title GSA Bulletin
DOI 10.1130/B30780.1
Volume 125
Issue 11-12
Year Published 2013
Language English
Publisher Geological Society of America
Contributing office(s) Pacific Coastal and Marine Science Center
Description 4 p.
First page 1943
Last page 1946
Online Only (Y/N) N
Additional Online Files (Y/N) N
Google Analytic Metrics Metrics page
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