Mechanical Weathering

2012 ◽  
Keyword(s):  
Mechanical Weathering

A CLIMOSEQUENCE OF CHRONOSEQUENCES: EXPLORING THE TEMPORAL EVOLUTION OF MECHANICAL WEATHERING ACROSS VARYING CLIMATES, CALIFORNIA

2020 ◽  
Author(s):  
Monica Rasmussen ◽  
◽  
Martha Cary Eppes ◽  
Samantha Berberich ◽  
Kaitlynn Bryan-Skaggs ◽  
...  
Keyword(s):  
Temporal Evolution ◽  
Mechanical Weathering

Some observations on rock weathering, Cumberland Peninsula, Baffin Island

1979 ◽  
Vol 16 (5) ◽  
pp. 977-983 ◽  
Author(s):  
Stephen H. Waits
Keyword(s):  
Salt Crystallization ◽  
Rock Weathering ◽  
Baffin Island ◽  
Significant Modification ◽  
Bedrock Weathering ◽  
Arctic Conditions ◽  
Selective Preservation ◽  
Mechanical Weathering ◽  
High Level

A variety of bedrock weathering features—both modern and remnant—including surface grus, polygonal cracks, siliceous glaze, tors, weathering pits, and tafoni typify upland outcrops on the Cumberland Peninsula. Tor ridges are particularly prevalent and at lower elevations they show significant modification and streamlining by flowing ice. On summit areas at elevations above 750 m, however, remnant corestones are preserved in situ, suggesting selective preservation of upland surfaces. Bedrock structure and composition, topographic position, and intensity of process strongly influence tor development. Weathering pits are common on high level, open summit surfaces where weathering occurs in response to both climate and continued removal of derived debris. Pit enlargement through lateral undercutting has been favoured by accumulation of protective bottom residua, mechanical weathering, and the presence of exfoliation crusts. It is postulated that salt crystallization plays a role in outcrop microweathering under present upland arctic conditions.

Mechanical Weathering: A Conceptual Overview

2021 ◽  
Author(s):  
Martha-Cary (Missy) Eppes
Keyword(s):  
Mechanical Weathering ◽  
Conceptual Overview

Mechanical Weathering in the Antarctic: A Maritime Perspective

2020 ◽  
pp. 103-123
Author(s):  
Kevin J. Hall
Keyword(s):  
Mechanical Weathering ◽  
The Antarctic

scholarly journals The periglacial engine of mountain erosion – Part 2: Modelling large-scale landscape evolution

2015 ◽  
Vol 3 (4) ◽  
pp. 463-482 ◽  
Author(s):  
D. L. Egholm ◽  
J. L. Andersen ◽  
M. F. Knudsen ◽  
J. D. Jansen ◽  
S. B. Nielsen
Keyword(s):  
Large Scale ◽  
Landscape Evolution ◽  
Computational Experiments ◽  
Frost Action ◽  
Erosion Rates ◽  
Bedrock Erosion ◽  
Simple Scaling ◽  
Sediment Cover ◽  
Mechanical Weathering ◽  
High Elevations

Abstract. There is growing recognition of strong periglacial control on bedrock erosion in mountain landscapes, including the shaping of low-relief surfaces at high elevations (summit flats). But, as yet, the hypothesis that frost action was crucial to the assumed Late Cenozoic rise in erosion rates remains compelling and untested. Here we present a landscape evolution model incorporating two key periglacial processes – regolith production via frost cracking and sediment transport via frost creep – which together are harnessed to variations in temperature and the evolving thickness of sediment cover. Our computational experiments time-integrate the contribution of frost action to shaping mountain topography over million-year timescales, with the primary and highly reproducible outcome being the development of flattish or gently convex summit flats. A simple scaling of temperature to marine δ18O records spanning the past 14 Myr indicates that the highest summit flats in mid- to high-latitude mountains may have formed via frost action prior to the Quaternary. We suggest that deep cooling in the Quaternary accelerated mechanical weathering globally by significantly expanding the area subject to frost. Further, the inclusion of subglacial erosion alongside periglacial processes in our computational experiments points to alpine glaciers increasing the long-term efficiency of frost-driven erosion by steepening hillslopes.

Mechanical Weathering

2008 ◽  
pp. 447-449
Author(s):  
L. R. Hossner ◽  
Eiju Yatsu
Keyword(s):  
Mechanical Weathering

scholarly journals Warmer, Wetter Climates Accelerate Mechanical Weathering in Field Data, Independent of Stress‐Loading

2020 ◽  
Vol 47 (24) ◽  
Author(s):  
M. C. Eppes ◽  
B. Magi ◽  
J. Scheff ◽  
K. Warren ◽  
S. Ching ◽  
...  
Keyword(s):  
Field Data ◽  
Mechanical Weathering

Temporal variation of chemical and mechanical weathering in NE Iceland: Evaluation of a steady-state model of erosion

2008 ◽  
Vol 272 (1-2) ◽  
pp. 78-88 ◽  
Author(s):  
E.S. Eiriksdottir ◽  
P. Louvat ◽  
S.R. Gislason ◽  
N. Óskarsson ◽  
J. Hardardóttir
Keyword(s):  
Steady State ◽  
Temporal Variation ◽  
State Model ◽  
Steady State Model ◽  
Mechanical Weathering
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