From mass-wasting to slope stabilization - putting constrains on a tectonically induced transition in slope erosion mode: A case study in the Judea Hills, Israel

Uri Ryb*, Ari Matmon, Naomi Porat, Oded Katz

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

Calcrete-coated remnants of landslide debris and alluvial deposits are exposed along the presently stable hillslopes of the Soreq drainage, Judea Hills, Israel. These remnants indicate that a transition from landslide-dominated terrain to dissolution-controlled hillslope erosion had occurred. This transition possibly occurred due to the significant decrease in tectonic uplift during the late Cenozoic. The study area is characterized by sub-humid Mediterranean climate. The drainage hillslopes are typically mantled by thick calcrete crusts overlying Upper Cretaceous marine carbonate rocks. Using TT-OSL dating of aeolian quartz grains incorporated in the calcrete which cements an ancient landslide deposit, we conclude that incision of ~100 m occurred from 1056±262 to 688±86 ka due to ~0·3° westward tilt of the region; such incision invoked high frequency of landslide activity in the drainage. The ages of a younger landslide remnant, alluvial terrace, and alluvial fan, all situated only a few meters above the present level of the active streambed, range between 688±86 ka and 244±25 ka and indicate that since 688±86 the Soreq base level had stabilized and that landslide activity decreased significantly by the middle Pleistocene.

Original languageAmerican English
Pages (from-to)551-560
Number of pages10
JournalEarth Surface Processes and Landforms
Volume38
Issue number6
DOIs
StatePublished - May 2013

Keywords

  • Calcrete
  • Carbonate terrains
  • Erosion mode
  • Hillslope transport
  • TT-OSL

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