Detailed Information

Cited 0 time in webofscience Cited 0 time in scopus
Metadata Downloads

Asymmetric Hillslope Retreat Revealed from Talus Flatirons on Rock Peak, San Tan Mountains, Arizona, United States: Assessing Caprock Lithology Control on Landscape Evolution

Authors
Oh, Jeong-SikSeong, Yeong BaeLarson, Phillip H.Hong, Seong-ChanYu, Byung Yong
Issue Date
2-1월-2020
Publisher
ROUTLEDGE JOURNALS, TAYLOR & FRANCIS LTD
Citation
ANNALS OF THE AMERICAN ASSOCIATION OF GEOGRAPHERS, v.110, no.1, pp.98 - 119
Indexed
SSCI
SCOPUS
Journal Title
ANNALS OF THE AMERICAN ASSOCIATION OF GEOGRAPHERS
Volume
110
Number
1
Start Page
98
End Page
119
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/58355
DOI
10.1080/24694452.2019.1624421
ISSN
2469-4452
Abstract
Talus flatirons (TFs) are morphostratigraphic markers of prior talus deposition that are now disconnected from the active hillslope. Three generations of TFs (TF1, TF2, TF3) exist flanking a Sonoran Desert inselberg, Rock Peak, in a welded tuff caprocks-controlled landscape bounded by pediments. TFs at Rock Peak enable estimation of slope retreat rates through the application of cosmogenic Be-10, optically stimulated luminescence dating, and catchment-wide denudation rates (CWDR). We estimate disconnection of TF1 on Rock Peak at 88.9 +/- 7.8 ka (northern slope) and 29.1 +/- 2.5 ka (southern slope). Rates of hillslope retreat measure between 311.6 mm center dot ka(-1) (northern slope) and 728.5 mm center dot ka(-1) (southern slope). Asymmetry in retreat rates is consistent with CWDR, with southern slopes denuding similar to 1.5 times faster. The asymmetry is interpreted as the result of the southward structural dip of strata present (>10 degrees). Denudation rates on the summit of Rock Peak (54.3 +/- 19.4 mm center dot ka(-1) welded tuff; 111.2 +/- 15.3 mm center dot ka(-1) sandstone conglomerate) support interpretation that removal of welded tuff caprock accelerates denudation of this landscape and amplifies the impact of the structural dip. Given this, we interpret that Rock Peak will evolve into a rounded residual hill as pediments flanking the inselberg lengthen through time, similar to landforms observed in the surrounding landscape where the welded tuff and underlying sedimentary caprocks are no longer present. Using the range of slope retreat rates from Rock Peak, we provide a first estimate for the length of time necessary for pediments to form via hillslope retreat in the Sonoran Desert. Key Words: caprock, landscape evolution, pediment association, talus flatiron, Be-10 exposure dating.
Files in This Item
There are no files associated with this item.
Appears in
Collections
College of Education > Department of Geography Education > 1. Journal Articles

qrcode

Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.

Altmetrics

Total Views & Downloads

BROWSE