scholarly journals Mechanical weathering and rock erosion by climate-dependent subcritical cracking

2017 ◽  
Vol 55 (2) ◽  
pp. 470-508 ◽  
Author(s):  
Martha-Cary Eppes ◽  
Russell Keanini
Keyword(s):  
Mechanical Weathering ◽  
Subcritical Cracking

Breaking it Down: Mechanical Processes in the Weathering Engine

Elements ◽  
2019 ◽  
Vol 15 (4) ◽  
pp. 247-252 ◽  
Author(s):  
Suzanne P. Anderson
Keyword(s):  
Chemical Weathering ◽  
Break Rock ◽  
Slow Process ◽  
Near Surface ◽  
Mineral Alteration ◽  
Lens Growth ◽  
Mechanical Weathering ◽  
Long Timescales ◽  
Subcritical Cracking ◽  
Applied Stresses

The vast diversity of landscapes found on Earth results from interplay between processes that break rock down, produce mobile regolith, and transport materials away. Mechanical weathering is fundamental to shaping landscapes, yet it is perhaps less understood at a mechanistic level than chemical weathering. Ubiquitous microfractures in rock propagate and grow through a slow process known as subcritical cracking that operates at the low applied stresses common in the near-surface. Subcritical cracking is the most likely explanation for the mechanical processes associated with thermal stress, ice lens growth, mineral alteration, and root growth. The long timescales over which critical zone architectures develop require an understanding of slow processes, such as subcritical cracking.

LONG TERM ROCK WEATHERING AND EROSION DRIVEN BY SUBCRITICAL CRACKING

2018 ◽  
Author(s):  
Martha Cary Eppes ◽  
◽  
Gregory S. Hancock ◽  
Xiaofeng Chen
Keyword(s):  
Rock Weathering ◽  
Subcritical Cracking

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

Mechanical Weathering

2012 ◽  
Keyword(s):  
Mechanical Weathering
Sign in / Sign up

Export Citation Format

Share Document