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Controls on deep critical zone architecture: a historical review and four testable hypotheses

Journal Article · · Earth Surface Processes and Landforms
DOI:https://doi.org/10.1002/esp.4052· OSTI ID:1606014
 [1];  [2];  [3]
  1. Univ. of Wyoming, Laramie, WY (United States); Pennsylvania State Univ
  2. Univ. of Wyoming, Laramie, WY (United States); Univ. of California, Berkeley, CA (United States)
  3. Pennsylvania State Univ., University Park, PA (United States)

The base of Earth’s critical zone (CZ) is typically shielded from study by many meters of overlying rock and regolith. Though deep CZ processes may seem far removed from the surface, they are vital in shaping it, preparing rock for infusion into the biosphere and breaking Earth materials down for transport across landscapes. This special issue highlights outstanding challenges and recent advances of deep CZ research in a series of articles that we introduce here in the context of relevant literature dating back to the 1500s. Building on several contributions to the special issue, we highlight four exciting new hypotheses about factors that drive deep CZ weathering and thus influence the evolution of life-sustaining CZ architecture. These hypotheses have emerged from recently developed process-based models of subsurface phenomena including: fracturing related to subsurface stress fields; weathering related to drainage of bedrock under hydraulic head gradients; rock damage from frost cracking due to subsurface temperature gradients; and mineral reactions with reactive fluids in subsurface chemical potential gradients. The models predict distinct patterns of subsurface weathering and CZ thickness that can be compared with observations from drilling, sampling and geophysical imaging. We synthesize the four hypotheses into an overarching conceptual model of fracturing and weathering that occurs as Earth materials are exhumed to the surface across subsurface gradients in stress, hydraulic head, temperature, and chemical potential. We finalize with a call for a coordinated measurement campaign designed to comprehensively test the four hypotheses across a range of climatic, tectonic and geologic conditions.

Research Organization:
Pennsylvania State Univ., University Park, PA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Chemical Sciences, Geosciences & Biosciences Division; National Science Foundation (NSF); Wyoming Center for Environmental Hydrology and Geophysics
Grant/Contract Number:
FG02-05ER15675
OSTI ID:
1606014
Alternate ID(s):
OSTI ID: 1533174
Journal Information:
Earth Surface Processes and Landforms, Journal Name: Earth Surface Processes and Landforms Journal Issue: 1 Vol. 42; ISSN 0197-9337
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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Designing a network of critical zone observatories to explore the living skin of the terrestrial Earth journal January 2017
Mapping Inherited Fractures in the Critical Zone Using Seismic Anisotropy From Circular Surveys journal April 2018
The frontier beneath our feet: FRONTIER BENEATH OUR FEET journal April 2017
Climate controls on coupled processes of chemical weathering, bioturbation, and sediment transport across hillslopes journal February 2018
Exploring an ‘ideal hill': how lithology and transport mechanisms affect the possibility of a steady state during weathering and erosion journal March 2020
Estimating the water holding capacity of the critical zone using near-surface geophysics journal September 2018
Climate driven coevolution of weathering profiles and hillslope topography generates dramatic differences in critical zone architecture journal December 2018
A low‐dimensional model of bedrock weathering and lateral flow coevolution in hillslopes: 1. Hydraulic theory of reactive transport journal December 2018
A low‐dimensional model of bedrock weathering and lateral flow coevolution in hillslopes: 2. Controls on weathering and permeability profiles, drainage hydraulics, and solute export pathways journal February 2019
Water within, moving through, and shaping the Earth's surface: Introducing a special issue on water in the critical zone journal August 2019
The influence of climate and topography on chemical weathering of granitic regoliths in the monsoon region of China journal August 2018
Critical Zone Structure Under a Granite Ridge Inferred From Drilling and Three-Dimensional Seismic Refraction Data journal June 2018
Drainage from the Critical Zone: Lithologic Controls on the Persistence and Spatial Extent of Wetted Channels during the Summer Dry Season journal August 2018
Leveraging Environmental Research and Observation Networks to Advance Soil Carbon Science journal May 2019
Cosmogenic Isotopes Unravel the Hydrochronology and Water Storage Dynamics of the Southern Sierra Critical Zone journal February 2019
Lithologically Controlled Subsurface Critical Zone Thickness and Water Storage Capacity Determine Regional Plant Community Composition journal April 2019
Stress‐Induced Anomalous Transport in Natural Fracture Networks journal May 2019
Direct observations of rock moisture, a hidden component of the hydrologic cycle journal February 2018
When multi-functional landscape meets Critical Zone science: advancing multi-disciplinary research for sustainable human well-being journal January 2018
Porosity production in weathered rock: Where volumetric strain dominates over chemical mass loss journal September 2019
Global patterns of dust and bedrock nutrient supply to montane ecosystems journal December 2017
Arrested development: Erosional equilibrium in the southern Sierra Nevada, California, maintained by feedbacks between channel incision and hillslope sediment production journal February 2019
The Effect of Lithology and Agriculture at the Susquehanna Shale Hills Critical Zone Observatory journal January 2018
Impacts of Quaternary History on Critical Zone Structure and Processes: Examples and a Conceptual Model From the Intensively Managed Landscapes Critical Zone Observatory journal March 2018
Stress‐Induced Anomalous Transport in Natural Fracture Networks text January 2019
Ideas and perspectives: Strengthening the biogeosciences in environmental research networks journal January 2018

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