Rock Glacier Activity in the Retezat Mountains, Southern Carpathians, Romania (English)

In: Permafrost and Periglacial Processes   ;  23 ,  2  ;  127-137  ;  2012

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Thermal conditions in seven rock glaciers (RGs) in the Retezat Mountains were examined using ground surface temperature, the bottom temperature of snow (BTS) and late‐summer water temperature at springs. Direct current resistivity profiles were used to detect ice‐rich layers and to estimate RG volume. These parameters were supplemented by measurements of RG surface movement and morphological characteristics in order to develop a RG typology. RG activity is suggested based on BTS values and the mean annual surface temperature. The lower altitudinal limits for permafrost occurrence and the activity of RGs were found to be at 2000 m and 2100 m asl, respectively. The two highest and most active RGs are younger than 8 ka and developed following a cold climate event at 8.2 ka when a last isolated glacial episode occurred in their hosting cirques, while the remaining RGs date from 11.5–8.7 ka. Calculated rockwall denudation rates to produce these forms range from 0.8–1.1 mm/yr. Copyright © 2012 John Wiley & Sons, Ltd.

Table of contents – Volume 23, Issue 2

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91
Origin and Flow Dynamics of Perennial Groundwater in Continuous Permafrost Terrain using Isotopes and Noble Gases: Case Study of the Fishing Branch River, Northern Yukon, Canada
Utting, Nicholas / Clark, Ian / Lauriol, Bernard / Wieser, Martin / Aeschbach‐Hertig, Werner | 2012
107
Internal Structure of a Lithalsa in the Akkol Valley, Russian Altai Mountains
Iwahana, Go / Fukui, Kotaro / Mikhailov, Nikolai / Ostanin, Oleg / Fujii, Yoshiyuki | 2012
119
The Impact of Permafrost Disturbances and Sediment Loading on the Limnological Characteristics of Two High Arctic Lakes
Dugan, Hilary A. / Lamoureux, Scott F. / Lewis, Ted / Lafrenière, Melissa J. | 2012
127
Rock Glacier Activity in the Retezat Mountains, Southern Carpathians, Romania
Vespremeanu‐Stroe, Alfred / Urdea, Petru / Popescu, Răzvan / Vasile, Mirela | 2012
138
Active Layer Characteristics At Ten Borehole Sites In Alpine Permafrost Terrain, Switzerland
Zenklusen Mutter, Evelyn / Phillips, Marcia | 2012
152
Earth Hummocks in West Dartmoor, SW England: Characteristics, Age and Origin
Killingbeck, James / Ballantyne, Colin K. | 2012
162
Soil Organic Carbon and Its Relationship to Vegetation Communities and Soil Properties in Permafrost Areas of the Central Western Qinghai‐Tibet Plateau, China
Wu, Xiaodong / Zhao, Lin / Chen, Meijun / Fang, Hongbing / Yue, Guangyang / Chen, Ji / Pang, Qiangqiang / Wang, Zhiwei / Ding, Yongjian | 2012
170
In‐Situ Observation of Cracks in Frozen Soil using Synchrotron Tomography
Bhreasail, Á. Ní / Lee, P. D. / O'Sullivan, C. / Fenton, C. H. / Hamilton, R. / Rockett, P. / Connolley, T. | 2012
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