Article
Geochemistry & Geophysics
David Escobedo, Patricia Patrier, Daniel Beaufort, Benoit Gibert, Lea Levy, Nathaniel Findling, Annette Mortensen
Summary: This study revisits the clay mineralogy of the smectite alteration zone in the Krafla geothermal field, finding that trioctahedral clay minerals and Al clay phases are prevalent in this area. The formation of these minerals is influenced by different stages and conditions of water-rock interactions, and the presence of Al clay phases indicates ongoing hydrothermal activity, making it a relevant signature for geothermal exploration.
Article
Geosciences, Multidisciplinary
Joseph R. Michalski, Paul B. Niles, Timothy D. Glotch, Javier Cuadros
Summary: Potassium metasomatism is a common geological process that can change the chemistry of large volumes of crust, forming potassium-rich rocks. Remote sensing on Mars has revealed potassium-rich terrains and rocks with evidence of K-enrichment in Gale Crater. This study suggests that the presence of potassium-rich rocks on Mars is consistent with potassium metasomatism, while the possibility of metasomatized crust sourcing the abundant feldspar in Gale Crater.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Geosciences, Multidisciplinary
Tim I. Yilmaz, Fabian B. Wadsworth, H. Albert Gilg, Kai-Uwe Hess, Jackie E. Kendrick, Paul A. Wallace, Yan Lavallee, James Utley, Jeremie Vasseur, Setsuya Nakada, Donald B. Dingwell
Summary: Study of sub-volcanic alteration usually requires indirect methods such as sampling of hydrothermal fluids or analysis of erupted products. Deep drilling at Mt Unzen provides a unique insight into the interaction between dacitic dykes and hydrothermal systems. This study reveals details of clay alteration, indicating acidic fluids with magmatic components and implications for hydrothermal circulation and volcanic stability.
BULLETIN OF VOLCANOLOGY
(2021)
Article
Engineering, Environmental
Peng Lin, Tengfei Yu, Zhenhao Xu, Ruiqi Shao, Wenyang Wang
Summary: This study presents a case study of TBM jamming caused by faults in a tunnel project. Through comprehensive analysis of the geological characteristics of fault rocks, it is found that the geochemical effects and long-term tectonic stresses play a major role in weakening the rock structure. The presence of mylonitization and cataclastic breccia fabrics further adds to the weakness of the fault rocks. The study provides engineering measures and recommendations to avoid similar accidents.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2022)
Article
Geosciences, Multidisciplinary
Howri Mansurbeg, Mohammad A. K. El-Ghali, Salahedin Shahrokhi, Jaroslav Reif, Hossein S. Hussein, Sadoon Morad
Summary: This study discusses the formation conditions of secondary Ca-Al silicates, attributing their formation to the small-scale variations in the chemistry of hydrothermal fluids. The paragenetic sequence of these silicates is suggested to have occurred at temperatures around 200-350 degrees Celsius, controlled by fluid chemistry variations.
GEOLOGICAL JOURNAL
(2021)
Article
Multidisciplinary Sciences
Bendadi Hanumantha Rao, Peddireddy Sreekanth Reddy, Bijayananda Mohanty, Krishna R. Reddy
Summary: Mineralogical and chemical compositions have a significant impact on the swelling behavior of expansive soils, with montmorillonite and Ca/Na ratio playing key roles. While chemical parameters initially trigger swelling, the overall phenomenon is mainly controlled by montmorillonite.
SCIENTIFIC REPORTS
(2021)
Article
Geology
Jian-Zheng Chen, Hui Zhang, Yong Tang, Zheng-Hang Lv, Yi An, Meng-Tao Wang, Kun Liu, Yu-Sheng Xu
Summary: This study investigates the relative contributions of magmatic and hydrothermal processes to the formation of pegmatite lithium deposits. Through the analysis of Li-rich minerals in different pegmatites, it was found that fractional crystallization during the magmatic stage is the key factor controlling Li mineralization. Subsequent hydrothermal processes alter primary minerals and disrupt lithium mineralization in the pegmatite.
ORE GEOLOGY REVIEWS
(2022)
Article
Soil Science
Juliet Emilia Santos de Sousa, Gabriel Ramatis Pugliese Andrade, Jose Coelho de Araujo, Jean Cheyson Barros dos Santos, Marcelo Metri Correa, Tiago Osorio Ferreira, Plinio Barbosa de Camargo, Jane Kelly Silva Araujo, Artur Henrique Nascimento da Silva, Marilya Gabryella Sousa, Valdomiro Severino de Souza Junior
Summary: Soils in Northeast Brazil have a correlation with soils in the Northwest Africa, as Planosols are predominant in these regions. However, the weathering and genesis of these soils are little understood, compromising their use and conservation.
Article
Geosciences, Multidisciplinary
Alaaddin Vural, Ibrahim Akpinar, Ferkan Sipahi
Summary: The study examined the clay areas in Gumushane, Turkey in mineralogical, geochemical, and remote sensing terms. Different clay areas were found to contain varying mineral compositions, with illite, kaolinite, and smectite being the predominant minerals. Remote sensing using Landsat 7 and 8 datasets provided good results for exploring clay occurrences in the region.
NATURAL RESOURCES RESEARCH
(2021)
Article
Geochemistry & Geophysics
Erwin Dehouck, Agnes Cousin, Nicolas Mangold, Jens Frydenvang, Olivier Gasnault, Olivier Forni, William Rapin, Patrick J. Gasda, Gwenael Caravaca, Gael David, Candice C. Bedford, Jeremie Lasue, Pierre-Yves Meslin, Kristin Rammelkamp, Marine Desjardins, Stephane Le Mouelic, Michael T. Thorpe, Valerie K. Fox, Kristen A. Bennett, Alexander B. Bryk, Nina L. Lanza, Sylvestre Maurice, Roger C. Wiens
Summary: Glen Torridon is a topographic trough on Mars with relatively strong spectral signatures of clay minerals. The Curiosity rover explored the area for over 700 Martian days to understand the geologic context of clay mineral formation and determine the intensity of aqueous alteration. Analysis of the bedrock's major-element geochemistry reveals distinct chemical compositions and mineralogical interpretations. Overall, the alteration in Glen Torridon shows elevated Chemical Index of Alteration values, suggesting the formation of clay minerals through open-system weathering.
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
(2022)
Article
Geology
Bin Wu, Yin-Qiu Hu, Christophe Bonnetti, Cheng Xu, Ru-Cheng Wang, Zhan-Shi Zhang, Zhi-Yan Li, Rong Yin
Summary: The study conducted detailed mineralogical and U-Th-Pb geochronological investigations on the Miaoya carbonatite complex in China, revealing the importance of post-magmatic metasomatic events for niobium mineralization, with a key metasomatic event identified at 235.4 +/- 4.1 Ma.
ORE GEOLOGY REVIEWS
(2021)
Article
Geochemistry & Geophysics
J. C. Viennet, C. Le Guillou, L. Remusat, F. Baron, L. Delbes, A. M. Blanchenet, B. Laurent, I. Criouet, S. Bernard
Summary: The study revealed differences in polymerization reactions of organic materials in the presence or absence of Fe-rich smectitic minerals under simulated asteroid conditions, and the influence of organic materials on the crystallization of minerals. These findings contribute to a better understanding of the interactions between organic materials and minerals in carbonaceous chondrites.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Environmental Sciences
Qi Chen, Zhifang Zhao, Jiaxi Zhou, Ruifeng Zhu, Jisheng Xia, Tao Sun, Xin Zhao, Jiangqin Chao
Summary: This study successfully mapped hydrothermal alteration minerals using ASTER and GF-5 satellite data, revealing the distribution characteristics of hydrothermal alteration minerals in the Longtoushan Pb-Zn deposit and validating the mapping ability of GF-5 data. This is of great significance for future systematic mapping of hydrothermal alteration minerals.
Article
Geosciences, Multidisciplinary
Desiree P. Hullaster, Gerilyn S. Soreghan, Ravi K. Kukkadapu, Brock S. Dumont, Kato T. Dee, Andrew S. Elwood Madden
Summary: The siliciclastic strata of the Colorado Plateau have distinctive colors that record early depositional and later diagenetic events. The study investigates the geological significance of the colors and reveals that grain size and water-rock interactions play a crucial role in producing the color variations.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Multidisciplinary Sciences
Andreea Baricz, Erika A. Levei, Marin Senila, Simona Cinta Pinzaru, Mihaela Aluas, Adriana Vulpoi, Claudiu Filip, Carmen Tripon, Dorin Dsdarlat, Doriana M. Buda, Francisc Dulf, Adela Pintea, Adorjan Cristea, Vasile Muntean, Zsolt G. Keresztes, Mircea Alexe, Horia Leonard Banciu
Summary: This study compared the characteristics of recent organic carbon-rich sediments from three Romanian lakes and found that they are mainly composed of photosynthetic pigments, have similar mineral composition, and similar physical properties to other therapeutic peloids.
SCIENTIFIC REPORTS
(2021)
Article
Geochemistry & Geophysics
Paolo Fulignati, Fabrizio Agosta, Claudia Belviso, Giacomo Prosser, Antonio Lettino, Angela Vita Petrullo, Francesco Cavalcante
Article
Mineralogy
Massimo D'Orazio, Paolo Fulignati, Anna Gioncada, Francesco Cavalcante
Summary: This work describes the first occurrence of albitite rocks in the Middle Triassic Verruca Formation, Monti Pisani, Northern Apennines, northern Tuscany, Italy. The albitite formed in an amagmatic environment and went through a series of hydrothermal alterations, leading to the transformation of minerals such as chlorite and hematite into albite. The study expands the understanding of post-collisional hydrothermal activity in Tuscany northwards.
MINERALOGICAL MAGAZINE
(2022)