Article
Engineering, Environmental
Junyi He, Yangyang Leng, Yong Wu, Wenbin Chang, Yu Zhuang, Fengchai Zou
Summary: This study experimentally investigated the impact factors of mudstone disintegration and analyzed the grain size distribution using orthogonal images. The findings showed that cyclic wetting and drying, high rotation speed, and ion-enriched solution significantly weakened the durability of mudstone, which could lead to geohazards and potential risks. The grain analysis based on orthogonal images improved the accuracy of acquiring grain size distribution.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2022)
Article
Geography, Physical
Tetsuya Kogure, Ryuya Sueyoshi, Hiroto Ohira, Yoshikazu Sampei, Ki-Cheol Shin, Yutaka Abe
Summary: Cliffs along the Isotake coast in Shimane, Japan, have two types of surfaces with different colors - with and without tafoni. The presence of tafoni is associated with salt weathering and a higher abundance of calcium in the cliff materials. Cliffs with tafoni are harder and have a lower risk of rockfalls.
Article
Geochemistry & Geophysics
Ferdinand J. Hampl, Ferry Schiperski, James M. Byrne, Christopher Schwerdhelm, Andreas Kappler, Casey Bryce, Friedhelm von Blanckenburg, Thomas Neumann
Summary: Weathering is a fundamental process that controls the development of Earth's surface. However, the weathering at depth in (semi-)arid regions has been rarely studied. It has been found that the weathering of iron-bearing minerals plays a major role in the advance of weathering at depth.
Article
Multidisciplinary Sciences
Haotian Guo, Runjian Zhou, Chao Sun, Yuli Lin, Zhe Wang
Summary: This study focused on the soil-water characteristics and shear strength of unsaturated complete-intense weathering mudstone. Measurements were conducted to determine the soil-water characteristic curve and matric suction of the mudstone samples in their natural state. Triaxial shear tests were also performed under different temperature and confining pressure conditions to investigate the shear strength and deformation characteristics of the mudstone. The results showed that the mudstone had a high percentage of silt and clay, low sand content, weak permeability, and significant capillary phenomenon. The study also revealed the effects of temperature and confining pressure on the shear stress and deformation of the mudstone samples, as well as the relationship between temperature and cohesion and internal friction angle. The findings of this study are valuable for understanding the behavior of unsaturated complete-intense weathering mudstone and enhancing the safety of engineering construction in areas with such geological conditions.
Article
Engineering, Geological
Chen Lu, Hongdan Yu, Honghui Li, Weizhong Chen
Summary: This study evaluates the physico-mechanical properties of Tamusu mudstone through a series of tests, and finds that it has good stability, low disintegration rate, low permeability, and high compressive strength, making it a potential medium for high-level radioactive waste disposal.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2022)
Article
Geology
Yonglei Zhang, Dan-Ping Yan, Jian-Feng Gao, Liang Qiu, Minghua Ren, Yue Zhang, Baifa Zhang, Dongcan Xu
Summary: The experiments showed that solutions containing Cl- ions in oxidised acidic systems leached Au most effectively. Weakly alkaline systems containing HCO3- ions leached Au less effectively. Solutions containing HS ions did not leach Au effectively.
ORE GEOLOGY REVIEWS
(2021)
Article
Engineering, Geological
Shifei Ping, Fugang Wang, Donghui Wang, Shengwei Li, Yilong Yuan, Guanhong Feng, Songhua Shang
Summary: Investigating the effects of water-rock reactions on the shear strength of gypsum-bearing mudstone is crucial for underground engineering design and safety assessment. A comprehensive study of the multi-scale deterioration effects and mechanisms of these reactions can lead to improved engineering applications. Laboratory dissolution tests and rock mechanical compression tests were conducted, revealing progressive modifications in mineralogy, porosity, grain structure, microstructures, and micropores complexity, with sodium sulfate and gypsum as the most active minerals. Water-rock reactions caused irreversible morphological changes and significant decreases in shear strength, mainly due to the increase in micropores and macropores volume and porosity.
ENGINEERING GEOLOGY
(2023)
Article
Geochemistry & Geophysics
Philip A. E. Pogge von Strandmann, Xianyi Liu, Chun-Yao Liu, David J. Wilson, Samantha J. Hammond, Gary Tarbuck, Ludmilla Aristilde, Alexander J. Krause, Wesley T. Fraser
Summary: This study investigates the impact of organic acids on lithium isotope behavior and finds that organic acids have significant effects on dissolved elemental concentrations, but little effect on lithium isotopes. The results have important implications for understanding the role of plants in weathering and the geological record.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Green & Sustainable Science & Technology
Erqiang Li, Yanqing Wei, Zhanyang Chen, Paul Archbold, Brian Mullarney
Summary: The transverse isotropy of rock masses formed by sedimentation is a common stratum environment in engineering, and the physical-mechanical properties can degrade due to water-rock interaction (WRI) and natural weathering. The Carbonaceous slate of the Muzhailing tunnel was studied, and Brazilian tests were conducted on specimens prepared under oven-drying and natural air-drying conditions. The results showed that WRI and natural weathering play a vital role in rock failure, but have little influence on the transverse isotropy tensile property of bedding.
Article
Acoustics
Yongjiang Yu, Pengbo Wang, Shipeng Zhang, Jingjing Liu
Summary: This study investigates the creep characteristics and crack evolution of water-rich soft rocks under dynamic loads through creep disturbance tests. Results show that the moisture content increase significantly affects the creep failure strain and rate of mudstone, leading to a transition in the type of creep disturbance failure. Acoustic emission analysis reveals that higher moisture content weakens the AE count and energy accumulation in mudstone specimens.
SHOCK AND VIBRATION
(2021)
Article
Chemistry, Multidisciplinary
U-Tat Lou, Shein-Fu Wu, Chen-Feng You, Chuan-Hsiung Chung, Eugenia Valsami-Jones, Emmanuel Baltatzis
Summary: This study analyzes the lithium content and isotopic composition of the active venting fluids in Milos Island and finds that these fluids contribute significantly to the oceanic lithium budget and global silicate weathering cycles.
Article
Geography, Physical
Marina Gallinaro, Andrea Zerboni
Summary: Physical and chemical analyses have been widely applied to study rock art contexts, but are still at an early stage in Africa. Reliability issues, particularly concerning chronology, arise due to various biodegradation processes affecting rock surfaces and pigments. Establishing protocols for sampling and analysis is urgently needed, as shown through the preliminary results of a new project in southern Ethiopia.
QUATERNARY INTERNATIONAL
(2021)
Article
Geosciences, Multidisciplinary
Lauren N. Schaefer, Gabor Kereszturi, Marlene Villeneuve, Ben Kennedy
Summary: By utilizing mineralogical-physical-mechanical relationships, rock properties can be derived from rapid, non-invasive reflectance spectroscopy measurements, particularly suited for volcanic rocks. The correlations of various physical and mechanical properties of altered volcanic rocks with reflectance spectroscopy indicate the presence and degradation of iron-bearing minerals, allowing for estimation of rock properties directly from such measurements. Ultimately, the use of aerial or satellite imaging spectroscopy could enable the creation of geotechnical maps at the scale of volcanoes.
JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
(2021)
Article
Environmental Sciences
A. Yagmur Goren, Gokhan Topcu, Mustafa M. Demir, Alper Baba
Summary: Experimental studies indicate that talc and diopside minerals in geothermal systems may cause scaling issues at high temperatures, depending on the properties of geothermal fluids and pH levels.
ENVIRONMENTAL EARTH SCIENCES
(2021)
Article
Geography, Physical
Christoph Wanner, Hoda Moradi, Philipp Ingold, Miguel A. Cardenas Bocanegra, Romano Mercurio, Gerhard Furrer
Summary: The presence of pyrite-bearing rocks promotes naturally occurring acid rock drainage (ARD) in permafrost environments. The interaction between solid ice, meltwater, and pyrite causes the formation of sulfuric acid and the mobilization of toxic elements. Field and laboratory studies showed that intact rock glaciers act as efficient chemical reactors, leading to high concentrations of toxic elements in high-alpine streams. The water quality downstream of intact rock glaciers with pyrite-bearing rocks should be carefully monitored to assess the future environmental hazard.
GLOBAL AND PLANETARY CHANGE
(2023)
