Quaternary-scale evolution of sequences of talus flatirons in the hyperarid Negev

Boroda, Ronen; Amit, Rivka; Matmon, Ari; Team, Aster; Finkel, Robert C.; Porat, Naomi; Enzel, Yehouda; Eyal, Yehuda

doi:10.1016/j.geomorph.2010.12.003

Cited by 38 publications

(63 citation statements)

References 44 publications

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“…Alternating periods of accumulation and incision in the slopes may result in the generation of talus flatiron chronosequences, being the relict slopes situated further apart from the scarp the oldest ones (e.g. Gutiérrez‐Elorza et al ., , , ; Gutiérrez‐Elorza and Sesé‐Martínez, ; Schmidt, ; Boroda et al ., ). Talus flatirons typically have a concave‐up parabolic longitudinal profile and a triangular or trapezoidal shape in plan view, with the apex pointing to the scarp.…”

Section: Introductionmentioning

confidence: 99%

Chronology and paleoenvironmental interpretation of talus flatiron sequences in a sub‐humid mountainous area: Tremp Depression, Spanish Pyrenees

Pau

Linares

Zarroca

et al. 2013

Earth Surf Processes Landf

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Talus flatirons are debris-covered relict slopes, disconnected from the source area, which are relatively common in arid and semi-arid areas. Talus flatiron sequences record the alternation of accumulation and incision phases. These chronosequences may be used for infer temporal changes in the morphogenetic processes acting on the slopes as well as information on the local paleoclimatic history. Talus flatiron sequences developed in the Tremp Depression, eastern Spanish Pyrenees, are analysed from the geomorphological, chronological and paleoenvironmental perspective. The two groups of relict slopes differentiated by means of detailed geomorphological mapping have been dated by optically stimulated luminescence (OSL) and radiocarbon dating at 25-20 kyr (S3) and 5Á4-1Á7 cal kyr (S2). The talus flatiron group S3 is correlated with a fluvial terrace of the Noguera Pallaresa River (c. 23 kyr BP). The comparison of the ages obtained in the Tremp Depression with chronologies published for talus flatiron sequences in semi-arid areas and other paleoclimatic proxies suggests that the aggradation phases in the slopes occurred during periods with higher humidity and vegetation cover. The chronological differences observed between semi-arid Spain and the Tremp Depression may be partly related to the more humid climate of the latter mountain area.

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Section: Introductionmentioning

confidence: 99%

Chronology and paleoenvironmental interpretation of talus flatiron sequences in a sub‐humid mountainous area: Tremp Depression, Spanish Pyrenees

Pau

Linares

Zarroca

et al. 2013

Earth Surf Processes Landf

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“…However, the variation in N(0) values is dramatic (Fig. 6), and would imply significant changes in rates of erosion over a relatively short time in a region that has been arid to hyperarid throughout most of the Pleistocene (Amit et al, 2006(Amit et al, , 2007Enzel et al, 2008;Boroda et al, 2011). Although this is a plausible explanation, we suggest that the variation in the values of N(0) is more easily explained by the long residence time of alluvial sediment within the Makhtesh.…”

Section: Terrace Ages and The Ancient Drainage Systemmentioning

confidence: 85%

Revealing sediment sources, mixing, and transport during erosional crater evolution in the hyperarid Negev Desert, Israel

et al. 2011

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“…Recent studies of exhumation rates of high-plateau surfaces in desert environments composed of hard carbonates, silicifi ed rocks, and highly resistant magmatic rocks (such as granites) reveal that erosion rates range between 1 and 5 m/m.y. (Fink et al, 2000;Matmon et al, 2009;Guralnik et al, 2010;Boroda et al, 2011;Fruchter et al, 2011). These fi ndings indicate an extremely low rate of denudation.…”

Section: Reconstruction Of the Oligocene Regional Truncation Surfacementioning

confidence: 86%

“…30-25 Ma) plateaus is understood in the context of the extremely low rate of denudaon November 28, 2012 gsabulletin.gsapubs.org Downloaded from tion since they were abandoned, in the range of 1-5 m/m.y., as indicated by Matmon et al (2002), Fruchter et al (2011), and Boroda et al (2011. Part of the preservation of the regional truncation surface relics is due to their long burial under Miocene sediments of the Red Sea Supergroup, which in some locations were only recently removed.…”

Section: One or Several Regional Truncation Surfaces?mentioning

confidence: 99%

Oligocene regional denudation of the northern Afar dome: Pre- and syn-breakup stages of the Afro-Arabian plate

Avni

Segev

Ginat

2012

Geological Society of America Bulletin

120

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A regional truncation surface developed during the Oligocene in the northern Red Sea and southern Levant as a result of the combined effects: (1) the formation of an ~3000 km × 1500 km crustal dome affecting the northeastern sector of the Afro-Arabian continent above the Afar plume, and (2) widespread fl uvial erosion that truncated the northern edge of this dome. The regional truncation surface separates two main stratigraphic divisions: (1) middle Eocene-early Oligocene prerift clastics preserved below the regional truncation surface and (2) late Oligo cene-Holocene Red Sea Supergroup deposited after the regional truncation surface developed. The prerifting sequence is composed of two major units: (1) Eocene marine intraformational debris fl ows (Themed clastics), and (2) fl uviolacustrine continental conglomerates, most of them monomictic (Mahatardi Conglomerate). The Red Sea Supergroup is composed of polymictic conglomerates, which include fragments of older rock units, down to the Precambrian. The reconstructed regional truncation surface and its subcrop map shed new light on the initial stages of the Afro-Arabian breakup, indicating two principal phases: (1) an Oligocene slow crustal doming, with reactivation of preexisting faults and the development of the regional truncation surface, all triggered by the upwelling of the Afar plume; and (2) late Oligo cene-early Miocene rifting of the Red Sea and Suez rift, which refaulted the region, including the initiation of the Dead Sea Transform along a preexisting suture line. This two-stage model indicates the mutual genetic relationship between the early Oligocene phase of tectonic development following the penetration of the Afar plume and the post-Oligocene rifting and continental breakup of the Afro-Arabian continent.

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Quaternary-scale evolution of sequences of talus flatirons in the hyperarid Negev

Cited by 38 publications

References 44 publications

Chronology and paleoenvironmental interpretation of talus flatiron sequences in a sub‐humid mountainous area: Tremp Depression, Spanish Pyrenees

Chronology and paleoenvironmental interpretation of talus flatiron sequences in a sub‐humid mountainous area: Tremp Depression, Spanish Pyrenees

Revealing sediment sources, mixing, and transport during erosional crater evolution in the hyperarid Negev Desert, Israel

Oligocene regional denudation of the northern Afar dome: Pre- and syn-breakup stages of the Afro-Arabian plate

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