Article
Geochemistry & Geophysics
Victor Cardenes, Marco A. Lopez-Sanchez, Fabrice Barou, Javier Olona, Sergio Llana-Funez
Summary: The article discusses the importance of mica-rich rocks in the structure of the continental crust, and how roofing slates serve as an excellent benchmark for studying the relationship between rock microstructure and seismic anisotropy. The research findings highlight the significant impact that cracks, pores, and fractures have on the seismic velocities of single-foliated slates, contributing to a strong anisotropy.
Article
Geochemistry & Geophysics
Amir Topaz, Tzahi Golan, Yuval Boneh
Summary: This study presents a petrofabric analysis of hornblende-rich amphibolites using electron backscatter diffraction to investigate the relation between hornblende texture and seismic anisotropy. The analysis distinguishes between different strain microstructures and reveals that the hexagonal crystallographic preferred orientation represents a metamorphic fabric under low strains, while the orthorhombic crystallographic preferred orientation represents a solid-state deformation fabric under increasing strains. By comparing the seismic anisotropy of natural hornblende textures, the study provides insights into the deformation scenarios of the lower crust. The dataset presented in this study offers a new framework for understanding and interpreting natural textures and seismic anisotropy from the lower crust.
Article
Geography, Physical
Maria-Gema Llorens, Albert Griera, Paul D. Bons, Ilka Weikusat, David J. Prior, Enrique Gomez-Rivas, Tamara de Riese, Ivone Jimenez-Munt, Daniel Garcia-Castellanos, Ricardo A. Lebensohn
Summary: This study investigates the influence of ice deformation history on the development of crystallographic preferred orientations (CPOs) using full-field numerical simulations. The results show that the second deformation event tends to destroy the first inherited fabric, but the transition is slow when crystallographic axes are critically oriented with respect to the second imposed regime. Therefore, caution must be exercised when interpreting observed CPOs in areas with complex deformation histories.
Article
Chemistry, Multidisciplinary
Lihui Zhang, Xiaobo Li, Fenfa Yao, Longren Li, Hongyang Huang, Xuewen Zhao, Shuhao Liu, Yonghong Cheng, Hua Xu, Jinying Zhang
Summary: This study reports a fast and nondestructive method to determine the crystallographic orientation of 2D violet phosphorus nanoflakes using Raman spectroscopy. It was found that the nanoflakes have specific in-plane cleavage edges and edge alignment. The direction of the b-axis (a-axis) can be identified by measuring the intensity of the A(g) mode in the Raman spectrum, specifically the appearance or disappearance of the 491 cm(-1) peak, relative to the cleavage edge.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Geochemistry & Geophysics
Jaeseok Lee, Haemyeong Jung
Summary: By studying two types of rocks with different mineral compositions in Gapyeong, South Korea, it was found that they exhibited different seismic anisotropy. The rock with hornblende showed higher seismic anisotropy, while the rock with olivine showed lower seismic anisotropy. This indicates that in subduction zones, the impact of hornblende on seismic anisotropy is more significant than that of olivine.
JOURNAL OF GEODYNAMICS
(2023)
Article
Geochemistry & Geophysics
Jianhua Liu, Shuyun Cao
Summary: This study examines naturally deformed amphibolites and reveals the crucial role of crystal preferred orientations and seismic anisotropy in fingerprinting the rheological and physical properties of the deep crust.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Geochemistry & Geophysics
Da-Peng Wen, Yong-Feng Wang, Jun-Feng Zhang
Summary: Extensive melt-peridotite interactions have been found beneath the North China Craton, and they have significant impacts on the deformation and seismic anisotropy of the upper mantle in that region.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Geosciences, Multidisciplinary
Longli Guan, Daisuke Yamazaki, Noriyoshi Tsujino, Yoshinori Tange, Yuji Higo
Summary: Through experiments, the study observed the lattice preferred orientation contributing to seismic anisotropy, indicating akimotoite is one of the dominant minerals near the subducting slabs in the lower mantle transition zone, suggesting its lattice preferred orientation may explain the observed seismic anisotropy.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Chemistry, Physical
Meijia Qiu, Peng Sun, Aimiao Qin, Guofeng Cui, Wenjie Mai
Summary: This article introduces a method to improve the long-term reversible plating/stripping of zinc anodes by introducing sorbitol as an additive. The research found that sorbitol can promote the preferred (002) orientation growth on the zinc anode surface, which facilitates stable inversion of the zinc deposition. Additionally, sorbitol modulates the solvation structure of Zn2+ and reduces common side reactions. Experimental results demonstrate the excellent stability of the zinc anode in zinc-zinc symmetric cells and other types of full cells.
ENERGY STORAGE MATERIALS
(2022)
Article
Geosciences, Multidisciplinary
H-R Wenk, J. Huang, M. Devoe, J. Gomez-Barreiro, R. Vasin, Y. Ren, S. Barrios-Sanchez
Summary: This study explored the preferred orientation of eleven slates and one phyllite of different composition and metamorphic grade from Northern Spain. The research found that phyllosilicates displayed high crystallographic and shape preferred orientation, while quartz had a random crystallographic orientation. The anisotropy of these slates significantly contributes to seismic anisotropy in the upper crust.
JOURNAL OF STRUCTURAL GEOLOGY
(2022)
Review
Geochemistry & Geophysics
Lars N. Hansen, Manuele Faccenda, Jessica M. Warren
Summary: Seismic anisotropy is a crucial tool for mapping mantle flow. Intrinsic anisotropy is mainly determined by the elastic anisotropy of minerals, while extrinsic anisotropy is influenced by the composite behavior of materials composed of multiple phases. Existing methods to model anisotropy in the upper mantle suggest that intrinsic anisotropy plays a significant role in the absence of fluids.
PHYSICS OF THE EARTH AND PLANETARY INTERIORS
(2021)
Article
Geography, Physical
Franz Lutz, David J. Prior, Holly Still, M. Hamish Bowman, Bia Boucinhas, Lisa Craw, Sheng Fan, Daeyeong Kim, Robert Mulvaney, Rilee E. Thomas, Christina L. Hulbe
Summary: Crystallographic preferred orientations (CPOs) are crucial in determining the mechanical properties of glacial shear margins. In this study, seismic and ultrasonic data were directly compared with measured CPOs in a polar shear margin, providing valuable insights into the anisotropy and alignment of CPOs. These findings have important implications for planning seismic surveys aimed at understanding the anisotropy of shear margins.
Article
Geochemistry & Geophysics
Cassandra Seltzer, Matej Pec, Mark E. Zimmerman, David L. Kohlstedt
Summary: We studied the co-evolution of melt, shape, and crystallographic preferred orientations (MPOs, SPOs, and CPOs) in experimentally deformed partially molten rocks and calculated their influence on seismic anisotropy. Our results showed that grain-scale and sample-scale alignments of melt pockets are different, and changes in the stress field drive a faster reorientation of the melt network compared to the realignment of crystallographic axes. The rapid changes in seismic anisotropy in a partially molten aggregate are mainly caused by MPO rather than CPO.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2023)
Article
Chemistry, Physical
Xiujuan Chen, Wei Li, Shanshan Hu, Novruz G. Akhmedov, David Reed, Xiaolin Li, Xingbo Liu
Summary: The application of a polyvinyl alcohol coating on the zinc anode has successfully achieved dendrite-free and long-life aqueous zinc batteries, demonstrating superior cyclability and durability. The insights gained from this research shed light on the future development of stable zinc anodes.
Article
Geochemistry & Geophysics
Sheng Fan, Andrew J. Cross, David J. Prior, David L. Goldsby, Travis F. Hager, Marianne Negrini, Chao Qi
Summary: The study found that under high temperature and stress conditions, strain weakening in ice is mainly influenced by the development of crystallographic preferred orientation (CPO) rather than grain size reduction. This may also apply to other viscously anisotropic minerals under similar conditions.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geochemistry & Geophysics
Rachel K. Wells, Wei Xiong, Erika Sesti, Jinlei Cui, Daniel Giammar, Philip Skemer, Sophia E. Hayes, Mark S. Conradi
GEOCHIMICA ET COSMOCHIMICA ACTA
(2017)
Review
Geochemistry & Geophysics
Yuval Boneh, Ze'ev Reches
Article
Engineering, Environmental
Wei Xiong, Rachel K. Wells, Jake A. Horner, Herbert T. Schaef, Philip A. Skemer, Daniel E. Giammar
ENVIRONMENTAL SCIENCE & TECHNOLOGY LETTERS
(2018)
Article
Geochemistry & Geophysics
A. J. Cross, P. Skemer
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2019)
Article
Geosciences, Multidisciplinary
Yuval Boneh, Emily Schottenfels, Kevin Kwong, Iris van Zelst, Xinyue Tong, Melody Eimer, Meghan S. Miller, Louis Moresi, Jessica M. Warren, Douglas A. Wiens, Magali Billen, John Naliboff, Zhongwen Zhan
GEOPHYSICAL RESEARCH LETTERS
(2019)
Article
Geochemistry & Geophysics
Charis Horn, Pierre Bouilhol, Philip Skemer
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2020)
Article
Geochemistry & Geophysics
Kelly Kranjc, Arashdeep S. Thind, Albina Y. Borisevich, Rohan Mishra, Katharine M. Flores, Philip Skemer
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2020)
Article
Geochemistry & Geophysics
Andrew J. Cross, Elizabeth Olree, Helene Couvy, Philip Skemer
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2020)
Article
Geochemistry & Geophysics
Yuval Boneh, Emily J. Chin, Benjamin H. Chilson-Parks, Alberto E. Saal, Erik H. Hauri, B. Carter Hearn, Greg Hirth
Summary: This study investigates the phenomenon of annealing in the mantle, specifically focusing on the process of discontinuous static recrystallization (DiSRX) and its effects on grain size and crystallographic preferred orientation (CPO). The results suggest that high temperatures and short episodes of intense deformation are necessary for DiSRX to occur. The microstructural transformation due to DiSRX is expected to occur during transient heating events associated with mantle upwelling, plumes, and lithospheric thinning.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2021)
Article
Geochemistry & Geophysics
Yuval Boneh, Emily J. Chin, Greg Hirth
Summary: By studying a sheared peridotite xenolith deformed under comparable strain rates to laboratory shearing time scales, variations in microstructure between monophase and multiphase bands were observed, shedding light on the rheological properties of the upper mantle. The microstructure analysis revealed a dominant and secondary activated crystallographic preferred orientation in olivine grains, along with deformation mechanisms involving dislocation creep and dynamic recrystallization. The reduction of grain size in orthopyroxene was found to promote activation of diffusion creep, indicating a high activation volume for wet orthopyroxene dislocation creep.
Article
Geochemistry & Geophysics
Benjamin Strozewski, Michael K. Sly, Katharine M. Flores, Philip Skemer
Summary: Quartz, an abundant mineral in Earth's crust, is difficult to measure viscoplastic rheology at low temperatures, but instrumented nanoindentation experiments allow for measurement over a wide temperature range. The study found that indentation hardness and yield stress of quartz are not affected by water content and only weakly depend on crystallographic orientation.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geochemistry & Geophysics
Emily J. Chin, Benjamin Chilson-Parks, Yuval Boneh, Greg Hirth, Alberto E. Saal, B. Carter Hearn, Erik H. Hauri
Summary: Xenoliths are important for understanding mantle deformation and geochemistry. By revisiting the classic work of Mercier and Nicolas (1975) and applying new techniques, this study reveals widespread hydrous metasomatism beneath the craton, likely linked to the Cenozoic Laramide Orogeny. Peridotite xenoliths from Homestead and Williams exhibit different textures and mineral water contents, reflecting a cratonic scale deformation cycle initiated during the Laramide orogeny in the Eocene.
Article
Geosciences, Multidisciplinary
C. M. Horn, P. Skemer
Summary: The study reveals that talc, commonly found in active fault zones, deforms through similar mechanisms across a wide range of depths. Friction remains an important control on talc deformation, even under high normal stresses. Additionally, high strain in talc leads to the generation of pore space, potentially enhancing fluid permeability.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geochemistry & Geophysics
Y. Boneh, M. Pec, G. Hirth
Summary: The mineral talc is stable over a wide range of pressure and temperature, and can form in mafic and ultramafic rocks and faults along plate boundaries. It is known to be one of the weakest minerals and may play a role in fault deformation and seismic activity. However, little is known about its mechanical properties under high temperatures and confining pressures. In this study, deformation experiments were conducted on talc cylinders under conditions simulating deep faults and subduction zones. The results show that talc's strength is highly dependent on temperature, with thermal weakening leading to increased strain localization. The observed friction coefficients for talc are consistent with those inferred for subducted slabs and the San Andreas fault. The presence of talc may explain the low strength of faults and subduction interfaces where slow slip events occur.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Geochemistry & Geophysics
Amir Topaz, Tzahi Golan, Yuval Boneh
Summary: This study presents a petrofabric analysis of hornblende-rich amphibolites using electron backscatter diffraction to investigate the relation between hornblende texture and seismic anisotropy. The analysis distinguishes between different strain microstructures and reveals that the hexagonal crystallographic preferred orientation represents a metamorphic fabric under low strains, while the orthorhombic crystallographic preferred orientation represents a solid-state deformation fabric under increasing strains. By comparing the seismic anisotropy of natural hornblende textures, the study provides insights into the deformation scenarios of the lower crust. The dataset presented in this study offers a new framework for understanding and interpreting natural textures and seismic anisotropy from the lower crust.
Article
Geochemistry & Geophysics
Lingyu Zhang, Kristoffer Szilas
Summary: This study presents new petrological and geochemical data for the Narssaq Ultramafic Body (NUB) in the Itsaq Gneiss Complex of SW Greenland. The results indicate that the ultramafic rocks of NUB are not mantle residues, but instead represent crustal cumulates derived from high-Mg magmas.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Rong Xu, Sarah Lambart, Oliver Nebel, Ming Li, Zhongjie Bai, Junbo Zhang, Ganglan Zhang, Jianfeng Gao, Hong Zhong, Yongsheng Liu
Summary: This study investigated the iron isotope compositions of Cenozoic basalts in Southeast China, finding significant variations related to different types of basalts and their respective sources.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
C. J. Ebinger, Miriam C. Reiss, Ian Bastow, Mary M. Karanja
Summary: The East African rift system is formed above mantle upwellings and the formation of rifts is related to lithospheric thinning and magmatic activity. The amount of splitting varies spatially and the fast axes are predominantly parallel to the orientation of the rifts. Thick lithospheric modules have less splitting and different orientations, which may indicate mantle plume flow. Splitting rotates and increases in strength as it enters the rift zones, suggesting that the anisotropy is mainly present at shallow depths.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Correction
Geochemistry & Geophysics
Ekaterina Rojas-Kolomiets, Owen Jensen, Michael Bizimis, Gene Yogodzinski, Lukas Ackerman
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Robert W. Nicklas, Igor S. Puchtel, Ethan F. Baxter
Summary: Oxygen fugacity is a fundamental parameter for understanding redox processes in igneous systems. This study compares the Fe-XANES oxybarometry method with the V-in-olivine method for evaluating fO(2) in MORB lavas. The results show that the V-in-olivine method is not applicable to samples with low MgO content, and that the majority of Archean komatiite sources have lower fO(2) than modern MORB.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Chunfei Chen, Stephen F. Foley, Sebastian Tappe, Huange Ren, Lanping Feng, Yongsheng Liu
Summary: The volatile components CO2 and H2O play a major role in mantle melting and heterogeneity. In this study, Ca isotopes were used to trace the lithological heterogeneity in alkaline magmatic rocks. The results revealed the presence of K-richterite and carbonate components as the source of alkaline magmas with low delta 44/40Ca values. These findings highlight the importance of Ca isotopes as a robust tracer of lithological variation caused by volatiles in the Earth's upper mantle.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Timothee Jautzy, Gilles Rixhon, Regis Braucher, Romain Delunel, Pierre G. Valla, Laurent Schmitt, Aster Team
Summary: Although the current approach to estimate catchment-wide denudation rates using only 10Be concentrations has made significant progress in geomorphology, this study argues for the inclusion of 26Al measurements and testing of steady-state assumptions in slow eroding, formerly glaciated landscapes. The study conducted measurements of both 10Be and 26Al in stream sediments from the Vosges Massif in France and found that elevation, slope, channel steepness, and precipitation were the primary factors controlling denudation rates. The study also revealed a significant relationship between the extent of past glaciation and the cosmogenic (un-)steadiness in the stream sediments.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Erik van der Wiel, Douwe J. J. van Hinsbergen, Cedric Thieulot, Wim Spakman
Summary: Numerical models of Earth's mantle dynamics can predict the vigour and mixing of mantle flow, and the average slab sinking rates are an unexplored parameter that can provide intrinsic information on these characteristics. Through numerical experiments, it has been found that slab sinking rates are strongly correlated with mantle convection and mixing, and may explain geochemical observations from hotspot volcanoes.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)