Article
Geochemistry & Geophysics
Li-Tao Ma, Li-Qun Dai, Yong-Fei Zheng, Zi-Fu Zhao, Wei Fang, Kai Zhao, Yilin Xiao, Fengtai Tong
Summary: The study of Late Paleozoic mafic igneous rocks in southwestern Tianshan in western China reveals that chemical metasomatism of the mantle wedge is a key mechanism for the incorporation of crustal components into the source of arc-like mafic igneous rocks above oceanic subduction zones.
JOURNAL OF PETROLOGY
(2021)
Article
Geology
Walter Maresch, Klaus Peter Stanek, Laura Speich, Hans-Peter Schertl, Diego Villagomez
Summary: Massive layers of garnet-quartz rocks up to one meter thick, as well as calc-silicate layers up to two meters thick, with distinct compositions and origins, but showing similar sedimentary precursors, are found on Margarita Island in Venezuela. The rocks are believed to have originated from an Early Cretaceous back-arc basin in NW Colombia, with evidence suggesting an exhalite origin for the garnet-rich and calc-silicate rocks.
INTERNATIONAL GEOLOGY REVIEW
(2022)
Article
Geochemistry & Geophysics
E. A. Codillo, F. Klein, B. Dragovic, H. R. Marschall, E. Baxter, M. Scambelluri, E. Schwarzenbach
Summary: Exhumed metasomatic reaction zones between mafic and ultramafic rocks from subduction zones provide insights into high-pressure mass-transfer processes. However, distinguishing them from inherited oceanic signatures is crucial for interpreting the rock record accurately. This study integrated various constraints to understand the formation of reaction zones between metagabbro and serpentinite, suggesting widespread metasomatism of mafic rocks by Mg-rich fluids and limited talc formation in subduction zones.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2022)
Article
Geochemistry & Geophysics
Yi Zhao, Jian-Ping Zheng, Qing Xiong
Summary: This study focuses on the complex metasomatic histories beneath the southern North China Craton by analyzing the Maowu ultramafic body in the Dabie orogen. The research reveals that different types of zircons, mineral compositions, and geochemical characteristics can record the evolution of a convergent margin from oceanic subduction to continental collision along the cratonic mantle periphery.
JOURNAL OF PETROLOGY
(2021)
Article
Multidisciplinary Sciences
Luis Felipe Orellana, Christophe Nussbaum, Luiz Grafulha, Pierre Henry, Marie Violay
Summary: This paper characterizes the physical and mineralogical properties of the internal fault core structure intersecting the main host rock investigated for nuclear waste storage at the Mont Terri Laboratory in Switzerland. The study found that the fault gouge has a higher permeability compared to the surrounding rock, but the barrier property of the geological formation is almost unaffected due to its limited thickness.
SCIENTIFIC REPORTS
(2022)
Article
Geochemistry & Geophysics
Lisa Kaatz, Julien Reynes, Jorg Hermann, Timm John
Summary: Granulites from Holsnoy in Norway underwent metastable state until fluid infiltration induced delayed eclogitization. The presence of interconnected hydrous eclogite-facies shear zones surrounded by unreacted granulites suggest rapid rock buffering of fluid composition. A cm-wide shear zone at early-stage eclogitization was analyzed to understand the relationship between deformation, fluid influx, and fluid-rock interaction. The study reveals the evolution of water-rich minerals from granulites to eclogites and identifies two mechanisms of fluid influx that contribute to the system's transition from rigid to weak.
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2022)
Article
Geochemistry & Geophysics
Vincent van Hinsberg, Chris Yakymchuk, Angunguak Thomas Kleist Jepsen, Christopher L. Kirkland, Kristoffer Szilas
Summary: This study uses thermodynamic modelling to constrain the conditions of corundum formation in southern Greenland, indicating that corundum saturation is the result of residual enrichment rather than Al mobilisation. A complex interplay among lithologies involved in corundum formation is highlighted, demonstrating that corundum formation is a predictable part of geological history.
Article
Geochemistry & Geophysics
Francesca Piccoli, Jay J. Ague, Xu Chu, Meng Tian, Alberto Vitale Brovarone
Summary: The study investigated a high-pressure metasomatic system preserved in Alpine Corsica, France, revealing the infiltration process of deep fluids. Fluid-mediated metasomatic process occurred along major intra-slab interfaces, accompanying two distinct metasomatic stages. The results indicate that when fluids are channelized, high time-integrated fluid fluxes lead to significantly increased carbon fluxes.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2021)
Article
Geosciences, Multidisciplinary
Susobhan Neogi, Tapan Pal
Summary: The Sonapahar sillimanite-corundum deposit in Meghalaya, Northeast India, is associated with high-grade metapelites and features an unusual occurrence of sillimanite-quartz, corundum-quartz, sapphirine-phlogopite-corundum-sillimanite rock. The pockets of sillimanite and corundum within the host quartz sillimanite schist have contrasting chemical signatures, suggesting a significant role of metasomatism in modifying the host rocks during post-peak metamorphism. Structural features and mineral enrichments near shear zones indicate that metasomatism played a key role in the formation of sillimanite-corundum rocks.
JOURNAL OF EARTH SYSTEM SCIENCE
(2021)
Article
Geosciences, Multidisciplinary
Kun Zhou, Yi-Xiang Chen, Jia-Wei Xiong, Hans-Peter Schertl, Xiao-Ping Xia
Summary: This study investigates the impact of fluid action on zircon geochemistry in subduction zones, particularly during metamorphic and metasomatic processes. The results show that fluid action significantly affects the U-Pb and O isotope systems of zircon, especially when external metasomatic fluids are involved.
GEOSCIENCE FRONTIERS
(2023)
Article
Geochemistry & Geophysics
Li-Tao Ma, Li-Qun Dai, Zi-Fu Zhao, Fang Huang, Bing Gong
Summary: We conducted an integrated study on mafic arc igneous rocks in Southwestern Tianshan, China to distinguish slab aqueous solutions from sediment melts in generating arc magmatism. The DKR and NZS rocks are enriched in fluid-mobile elements, while the SXY rocks are enriched in melt-mobile elements. Quantitative model calculations and analysis of geochemical characteristics further confirmed these findings.
Article
Geochemistry & Geophysics
Kai Zhao, Li-Qun Dai, Wei Fang, Yong-Fei Zheng, Zi-Fu Zhao, Fei Zheng
Summary: Chemical metasomatism of the mantle wedge by slab-derived fluids is an important mechanism for the compositional features of mafic magmas above oceanic subduction zones. The decoupling of Mg and Ca isotopes in alkali basalts from the South Qinling Orogen in central China indicates possible physicochemical differentiation during the transport of metasomatic agents. These basalts exhibit OIB-like trace element distribution patterns and show decoupling between Mg and Ca isotopes, providing new insights into the differentiation behaviors of subduction zone fluids.
Article
Geosciences, Multidisciplinary
Abhinaba Roy, Sandip Kumar Roy, H. M. Ramchandra
Summary: The mineral assemblages in ductile shear zones are affected by high-temperature fluids, leading to chemical metasomatism. In the Sakoli Fold Belt of central India, the occurrence of sillimanite in shear zones is influenced by infiltrated high-temperature fluids. The growth of sillimanite in these shear zones coincides with the peak of deformation and metamorphism, possibly due to the high-strain environment.
JOURNAL OF EARTH SYSTEM SCIENCE
(2023)
Article
Mechanics
Justin Jordan Pidho, Yuanfang Cheng, Arthur Godfrey Batte, Mukiibi Ssewannyaga Ivan, Chuanliang Yan
Summary: In this study, a globally embedded cohesive zone model within a three-dimensional elastoplastic framework is proposed to understand the complex fracture development in soft shale formations. The results indicate that the coefficient of friction has a significant impact on rock slip, and injection rates also affect the opening of fractures. The model is validated and has been shown to be accurate and applicable, which is important for understanding the complexity of fracture development and associated slip phenomena in soft jointed rocks.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Mechanics
Bahador Bahrami, Saeid Ghouli, Morteza Nejati, Majid Reza Ayatollahi, Thomas Driesner
Summary: The influence of specimen size on the measured values of true mode II fracture toughness of rocks has been investigated. Experimental results show that the fracture toughness increases significantly with larger specimen size. A novel mathematical model based on the fracture process zone and energy release rate concepts accurately predicts the size effect phenomenon in the experimental data.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2022)
Article
Geosciences, Multidisciplinary
Manideepa Roy Choudhury, Subhrajyoti Das, Sadhana M. Chatterjee, Sudipta Sengupta
JOURNAL OF EARTH SYSTEM SCIENCE
(2016)
Article
Geochemistry & Geophysics
Sadhana M. Chatterjee, Manideepa Roy Choudhury, Subhrajyoti Das, Alip Roy
Article
Geosciences, Multidisciplinary
Sadhana Mahato, Abhijit Bhattacharya
JOURNAL OF ASIAN EARTH SCIENCES
(2010)
Article
Geosciences, Multidisciplinary
S. Mahato, S. Goon, A. Bhattacharya, B. Mishra, Heinz-J. Bernhardt
PRECAMBRIAN RESEARCH
(2008)
Article
Geosciences, Multidisciplinary
A. K. Maji, S. Goon, A. Bhattacharya, B. Mishra, S. Mahato, Heinz-J. Bernhardt
PRECAMBRIAN RESEARCH
(2008)
Article
Geosciences, Multidisciplinary
S. Rekha, D. Upadhyay, A. Bhattacharya, E. Kooijman, S. Goon, S. Mahato, N. C. Pant
PRECAMBRIAN RESEARCH
(2011)
Article
Geochemistry & Geophysics
Sadhana M. Chatterjee, Ayan Kumar Sarkar, Alip Roy, Anirban Manna
Article
Geosciences, Multidisciplinary
B. Mishra, C. S. Saravanan, A. Bhattacharya, S. Goon, S. Mahato, H. J. Bernhardt