干旱区生态环境知识资源中心(Arid): Asymmetric Hillslope Retreat Revealed from Talus Flatirons on Rock Peak, San Tan Mountains, Arizona, United States: Assessing Caprock Lithology Control on Landscape Evolution

Arid

DOI	10.1080/24694452.2019.1624421
	Asymmetric Hillslope Retreat Revealed from Talus Flatirons on Rock Peak, San Tan Mountains, Arizona, United States: Assessing Caprock Lithology Control on Landscape Evolution
	Oh, Jeong-Sik 1; Seong, Yeong Bae 1; Larson, Phillip H.3; Hong, Seong-Chan 2; Yu, Byung Yong 4
通讯作者	Oh, Jeong-Sik
来源期刊	ANNALS OF THE AMERICAN ASSOCIATION OF GEOGRAPHERS
ISSN	2469-4452
EISSN	2469-4460
出版年	2020
卷号	110 期号:1 页码:98-119
英文摘要	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.
类型	Article
语种	英语
国家	South Korea ; USA
收录类别	SSCI
WOS记录号	WOS:000481268600001
WOS关键词	MOJAVE DESERT ; SCARP RETREAT ; COSMOGENIC RADIONUCLIDES ; PEDIMENT DEVELOPMENT ; LIFE EXPECTANCY ; EROSION RATES ; CLIFF RETREAT ; QUARTZ ; BASIN ; BE-10
WOS类目	Geography
WOS研究方向	Geography
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/318798
作者单位	1.Korea Univ, Dept Geog Educ, Geomorphol, Seoul 02841, South Korea; 2.Korea Univ, Dept Geog Educ, Geog, Seoul 02841, South Korea; 3.Minnesota State Univ, Dept Geog, Earth Sci Programs, Mankato, MN 56001 USA; 4.Korea Inst Sci & Technol, AMS Lab, Seoul 02791, South Korea
推荐引用方式 GB/T 7714	Oh, Jeong-Sik,Seong, Yeong Bae,Larson, Phillip H.,et al. Asymmetric Hillslope Retreat Revealed from Talus Flatirons on Rock Peak, San Tan Mountains, Arizona, United States: Assessing Caprock Lithology Control on Landscape Evolution[J],2020,110(1):98-119.
APA	Oh, Jeong-Sik,Seong, Yeong Bae,Larson, Phillip H.,Hong, Seong-Chan,&Yu, Byung Yong.(2020).Asymmetric Hillslope Retreat Revealed from Talus Flatirons on Rock Peak, San Tan Mountains, Arizona, United States: Assessing Caprock Lithology Control on Landscape Evolution.ANNALS OF THE AMERICAN ASSOCIATION OF GEOGRAPHERS,110(1),98-119.
MLA	Oh, Jeong-Sik,et al."Asymmetric Hillslope Retreat Revealed from Talus Flatirons on Rock Peak, San Tan Mountains, Arizona, United States: Assessing Caprock Lithology Control on Landscape Evolution".ANNALS OF THE AMERICAN ASSOCIATION OF GEOGRAPHERS 110.1(2020):98-119.