introduction alluvial fans are depositional landforms developed on a confined channel emerged from a drainage basin, i.e. between a mountain range and a plain. an alluvial fan is a fan- or cone-shaped deposit of sediments crossed and built up by streams. if a fan is built up by debris flows, it is properly called a debris cone or colluvial fan. these flows come from a single point source at the...

ghalajeh synclinal is extended on the south of kermanshah province from northwest to southeast. considering the permanent tectonic movements in quaternary and current age in studied region, the alluvial fans of the region is a good reason for evaluation of such movements. the morphology and morphometry properties of alluvial fans are severely under the effect of the tectonic activities. the aim...

For the last two decades, climatically based interpretations have been the major focus in evolutionary studies of dryland alluvial fans. Climatic hypotheses to explain the development of alluvial fans in southern Death Valley, however, do not fare well when they are assessed with criteria used by philosophers of science. First and foremost, dating techniques do not have the chronometric precisi...

Alluvial fans develop at the base of drainages where feeder channels release their solid load (Blair and McPherson, 2009; Leeder et al., 1998; Harvey et al., 2005). A classic fan-shape forms where there is a well-defined topographic apex. Multiple feeder channels, however, often blur the fan-shape resulting in a merged bajada. Alluvial fans can be found in almost all terrestrial settings. These...

a r t i c l e i n f o Keywords: Colorado River basalt cosmogenic 3 He surface exposure ages climate change desert pavement desert alluvial fans southwest USA geomorphology Plio-Pleistocene deposits of the Lower Colorado River (LCR) and tributary alluvial fans emanating from the Black Mountains near Golden Shores, Arizona record six cycles of Late Cenozoic aggradation and incision of the LCR and...

introduction iran forms a relatively compact zone of active continental deformation resulted from the northward collision of arabia with eurasia during late cenozoic times, which is continuing to the present-day at a rate of 25 mm/yrs (from gps data). evidences of active tectonic in different parts of iran, has been studied and identified. the arid climate, low rates of erosion, and minimal veg...