Application of Relative-Age Dating Techniques on Rock Glaciers of the La Sal Mountains, Utah: An Interpretation of Holocene Paleoclimates

1996 ◽  
Vol 78 (1) ◽  
pp. 1 ◽  
Author(s):  
Joseph W. Nicholas ◽  
David R. Butler
Keyword(s):  
Age Dating ◽  
Relative Age ◽  
Rock Glaciers

Schmidt-hammer exposure-age dating (SHD) of rock glaciers in the Schöderkogel-Eisenhut area, Schladminger Tauern Range, Austria

The Holocene ◽  
2011 ◽  
Vol 22 (7) ◽  
pp. 761-771 ◽  
Author(s):  
Matthias Rode ◽  
Andreas Kellerer-Pirklbauer
Keyword(s):  
Root Zone ◽  
Age Dating ◽  
Surface Velocity ◽  
Schmidt Hammer ◽  
Rock Glacier ◽  
Relative Age ◽  
Exposure Age ◽  
Rock Glaciers ◽  
Glacier Length ◽  
Eastern Austria

Schmidt-hammer rebound values ( R-values) enable relative-age dating of landforms, with R-values relating to degree of weathering and therefore length of exposure. This method – recently termed as Schmidt-hammer exposure-age dating (SHD) – was applied to date five rock glaciers (size range, 0.01–0.12 km2) and one recent rockfall deposit at the study area Schöderkogel-Eisenhut, in the Schladminger Tauern Range (14°03′E, 47°15′N), Austria. The rock glaciers consist of gneiss or high metamorphic series of mica-schist that are comparable in their R-values. Four of them are relict (permafrost absent) and one is intact (containing patches of permafrost). On each of the five rock glaciers, SHD was carried out at 4–6 sites (50 measurements per site) along a longitudinal transect from the frontal ridge to the root zone. Results at all five rock glaciers are generally consistent with each other sharing statistically significant R-values along transects. The range between the highest and the lowest mean R-value at each of the five rock glaciers is 9.9–5.2. Using rock glacier length and surface velocity data from nearby sites, the rock glacier development must have lasted for several thousand years. Furthermore, by using SHD results from rock glaciers of known age from other sites in the region with comparable geology, approximate surface ages of 6.7–11.4 ka were estimated. This indicates long formation periods for all five rock glaciers. Our results suggest that many of the 1300 relict rock glaciers in central and eastern Austria were formed over a long period during the Lateglacial and Holocene period.

scholarly journals Relative age dating of terrestrial events: geologic layering and geologic time

Earth ◽  
2013 ◽  
pp. 73-82
Author(s):  
Jonathan I. Lunine ◽  
Cynthia J. Lunine
Keyword(s):  
Age Dating ◽  
Relative Age ◽  
Geologic Time

scholarly journals Relative Ages from Horizontal-Branch Morphology: Revisited

2002 ◽  
Vol 207 ◽  
pp. 110-112
Author(s):  
Young-Wook Lee ◽  
Hyun-chul Lee ◽  
Suk-Jin Yoon ◽  
Soo-Chang Rey ◽  
Brian Chaboyer
Keyword(s):  
High Precision ◽  
Globular Clusters ◽  
Age Dating ◽  
Age Difference ◽  
Stellar Systems ◽  
Horizontal Branch ◽  
Ccd Photometry ◽  
Relative Age ◽  
New Models ◽  
Branch Morphology

We present our recent revision of model constructions for the horizontal-branch (HB) morphology of globular clusters, which suggests the HB morphology is more sensitive to age compared to our earlier models. We also present our high precision CCD photometry for the classic second parameter pair M3 and M13. The relative age dating based on this photometry indicates that M13 is indeed older than M3 by 1.7 Gyr. This is consistent with the age difference predicted from our new models, which provides a further support that the HB morphology is a reliable age indicator in most population II stellar systems.

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