Article
Geochemistry & Geophysics
Mayara F. Cizina, T. Dylan Mikesell, Matthew J. Kohn
Summary: Raman spectroscopy is commonly used to identify mineral and fluid inclusions in host crystals and calculate pressure-temperature conditions for thermobarometric applications. This study aims to determine the reproducibility of Raman peak position measurements for quartz and zircon inclusions, as well as to identify optimal measurement conditions. The results provide important insights for interlaboratory comparisons and improve the accuracy of elastic thermobarometry.
AMERICAN MINERALOGIST
(2023)
Article
Geochemistry & Geophysics
Nicola Campomenosi, Ross J. Angel, Matteo Alvaro, Boriana Mihailova
Summary: Elastic geothermobarometry relies on the contrast between the thermal expansion and compressibility of a mineral inclusion and its surrounding host, leading to a residual pressure in the inclusion (P-inc) that may differ significantly from the external pressure. Quartz-in-garnet (QuiG) inclusion-host systems were studied using in situ high-pressure Raman spectroscopy, revealing that the garnet host acts as a shield to the softer quartz inclusion. The behaviour of QuiG systems under elevated pressures and the importance of elastic anisotropy for accurate geothermobarometry were emphasized.
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2023)
Article
Geochemistry & Geophysics
Tamas Spranitz, Csaba Szabo, Mattia Gilio, Matteo Alvaro, Michaela Blazekova, Patrik Konecny, Tamas Vaczi, Marta Berkesi
Summary: Fluid and mineral inclusions in metamorphic rocks play a crucial role in understanding fluid-involved processes in subduction zones. This study focuses on ultramafic granulite from the Cabo Ortegal Complex in Spain, using quartz-in-garnet and zircon-in-garnet Raman spectroscopy to determine the entrapment conditions of mineral and fluid inclusions. The findings confirm the reliability of elastic thermobarometry on mineral inclusions in determining the entrapment P-T conditions. Rating: 8 out of 10.
Article
Geochemistry & Geophysics
Joseph P. Gonzalez, Mattia L. Mazzucchelli, Ross J. Angel, Matteo Alvaro
Summary: A new elastic model taking into account anisotropic elastic properties and relative crystallographic orientation (RCO) of a host-inclusion system has been developed for elastic thermobarometry. Results suggest that this anisotropic model is more suitable for determining inclusion pressures and has better applicability in elastic thermobarometry compared to isotropic models.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geochemistry & Geophysics
Xin Zhong, Anselm Loges, Vladimir Roddatis, Timm John
Summary: Raman spectroscopy is widely used in mineralogy and petrology for identifying mineral phases, including measuring residual pressure of mineral inclusions and understanding the crystallographic orientations between inclusions and hosts. The analysis of tiny mineral inclusions using EBSD technique is time consuming, but polarized Raman spectroscopy can provide precise measurement of crystallographic orientation. The orientation of tiny mineral inclusions can be accurately determined using the Raman polarizability tensor of quartz, with a precision of approximately 0.25 degrees.
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2021)
Article
Geochemistry & Geophysics
Miguel Cisneros, Whitney M. Behr, John P. Platt, Robert Anczkiewicz
Summary: By using quartz-in-garnet elastic barometry, we have constrained the formation pressures of eclogites from different locations, suggesting that these rocks may have originated from similar structural levels.
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2022)
Article
Geochemistry & Geophysics
Minghai Fu, Jingjing Dai, Longxian Zhao
Summary: Raman spectroscopy is a non-destructive and rapid method for analyzing and measuring mineral composition and structure. This study conducted micro-Raman spectrum and electron microprobe research on garnet from the Jiama copper polymetallic deposit in Tibet. The results showed that the Raman peaks of garnet shifted with the increase in andradite content, and the Raman spectrum can indicate the composition change in garnet. The analysis of garnet's Raman spectrum is of great significance for skarn zoning and prospecting.
Review
Geosciences, Multidisciplinary
Jan Schoenig, Hilmar von Eynatten, Guido Meinhold, Nils Keno Luensdorf
Summary: Studying ultrahigh-pressure metamorphism through mineral inclusions in sedimentary rocks provides important insights into plate tectonics evolution and the existence of ultrahigh-pressure terranes.
EARTH-SCIENCE REVIEWS
(2022)
Article
Nanoscience & Nanotechnology
Fabio Isa, James P. Best, Anna Marzegalli, Marco Albani, Christophe Comte, Jamie J. Kruzic, Avi Bendavid
Summary: A novel approach is presented in this paper to tailor the stress properties of diamond thin films through boron doping and micro-fabrication of bridges using focused ion beam milling. Experimental data, supported by detailed confocal micro-Raman investigations and finite element method calculations, suggest that appropriate design of microbridge geometries, together with boron doping, can significantly enhance or diminish material stress compared to non-patterned thin films. This approach, combined with deterministic incorporation and positioning of diamond color centers, may offer new opportunities to tailor the optical and spin properties of diamond-based quantum devices through stress engineering.
Article
Materials Science, Ceramics
Congxue Su, Liang Fang, Laiyuan Ao, Qianbiao Du, Yifan Zhai, Jie Li, Junqi Chen, Ying Tang, Laijun Liu
Summary: By substituting Zr4+ with Sn4+, the packing fraction is increased and the Q x f value is enhanced, resulting in good microwave dielectric properties. A smaller oxygen bond valence contributes to the improvement of the microwave dielectric properties of the material.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Geology
Pauline Jeanneret, Iwona Klonowska, Christopher Barnes, Jaroslaw Majka, Johanna Holmberg, Mattia Gillio, William Nachlas, Matteo Alvaro, Karolina Kosminska, Henning Lorenz, Thomas Zack, Anna Ladenberger, Hemin Koyi
Summary: The tectonometamorphic evolution of the Lower Seve Nappe in the Scandinavian Caledonides was characterized using various P-T estimation techniques. The results show that quartz inclusions in garnet provide critical data to constrain the evolutionary path of the metasedimentary rocks.
JOURNAL OF METAMORPHIC GEOLOGY
(2023)
Article
Chemistry, Physical
T. I. Milenov, I. A. Avramova, A. Dikovska, D. Karaivanova, P. Terziyska, S. K. Kolev, D. Karashanova, B. Georgieva, D. Dimov, V. Atanasov, E. P. Valcheva
Summary: The study found that UV-C irradiation had a significant impact on the structural quality of a-C:H and ta-C:H films, reducing the content of sp(3) and oxygen-containing radicals. The influence of UV-C light directed almost parallel to the films' surface on the structural quality of graphene-like films was slightly higher than that directed perpendicular.
SURFACES AND INTERFACES
(2021)
Article
Physics, Multidisciplinary
Sergey S. Lobanov, Sergio Speziale, Bjoern Winkler, Victor Milman, Keith Refson, Lukas Schifferle
Summary: This study reported the first direct measurements of the refractive index of silica glass up to 145 GPa, and identified two major anomalies at around 10 and 40 GPa. The compressibility and density of noncrystalline solids were accurately measured in simple optical experiments up to at least 110 GPa.
PHYSICAL REVIEW LETTERS
(2022)
Article
Chemistry, Physical
Bakhtiar Ali, Han Xu, Dashavir Chetty, Robert T. Sang, Igor Litvinyuk, Maksym Rybachuk
Summary: The degree of laser-induced graphitization in single crystal chemical vapor deposited diamond was studied. The sp(3) phase transitions to sp(2) aromatic crystalline graphitic fraction below a critical fluence, above which amorphous carbon is formed. The increase in fluence leads to a significant increase in the depth of graphitized areas and cleavage of C=O bonds.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Geochemistry & Geophysics
Michael J. Dorais, Stephen Campbell
Summary: The Flagstaff Lake Igneous Complex in western Maine contains three phases of garnet-bearing, strongly peraluminous rocks: Loon Lake, Quarry Phase A, and Quarry Phase B. The garnet in the Loon Lake phase has δ818O values of 10 permil, matching a minor subset of accompanying zircon. Most zircons in this phase have higher δ818O values, suggesting contamination after garnet crystallization. The garnets in Quarry Phase A and Phase B have different isotopic compositions, indicating different crystallization processes.
Article
Geosciences, Multidisciplinary
Robin B. Trayler, Mark D. Schmitz, Jose Cuitino, Matthew J. Kohn, M. Susana Bargo, Richard F. Kay, Caroline A. E. Stromberg, Sergio F. Vizcaino
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2020)
Editorial Material
Geochemistry & Geophysics
Daniel David Gregory, Matthew J. Kohn
AMERICAN MINERALOGIST
(2020)
Article
Geochemistry & Geophysics
Celina A. Suarez, Matthew J. Kohn
GEOCHIMICA ET COSMOCHIMICA ACTA
(2020)
Article
Geochemistry & Geophysics
Amanda E. Drewicz, Robin B. Trayler, Mariah E. Holloway, Claire O. Harrigan, Matthew J. Kohn
GEOCHIMICA ET COSMOCHIMICA ACTA
(2020)
Article
Geology
Sean P. Long, Matthew J. Kohn
Article
Geosciences, Multidisciplinary
Robin B. Trayler, Matthew J. Kohn, M. Susana Bargo, Jose I. Cuitino, Richard F. Kay, Caroline A. E. Stromberg, Sergio F. Vizcaino
PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
(2020)
Article
Geology
Kayleigh M. Harvey, Sarah C. Penniston-Dorland, Matthew J. Kohn, Philip M. Piccoli
Summary: Thermobarometric analysis on tectonic melange in California reveals different blocks with metamorphic temperature and pressure differences, suggesting mixing from varying depths along the subduction interface possibly up to 20-30 km.
JOURNAL OF METAMORPHIC GEOLOGY
(2021)
Article
Geochemistry & Geophysics
Sean P. Long, Matthew J. Kohn, Buchanan C. Kerswell, Jesslyn K. Starnes, Kyle P. Larson, Nolan R. Blackford, Emmanuel Soignard
Article
Geosciences, Multidisciplinary
Jose Cuitino, M. Sol Raigemborn, M. Susana Bargo, Sergio F. Vizcaino, Nahuel A. Munoz, Matthew J. Kohn, Richard F. Kay
Summary: The Santa Cruz Formation in Patagonia, Argentina, is a well-exposed fluvial succession containing abundant fossil vertebrates accumulated during the Miocene Climatic Optimum. The sedimentation of the floodplain-dominated fluvial system remained constant over a period of 3 myr, influenced by factors such as tectonics, global sea level, climate, and sediment supply. The formation records a Santacrucian fauna with no significant changes throughout the section, indicating a period of relatively stable environmental conditions.
JOURNAL OF THE GEOLOGICAL SOCIETY
(2021)
Article
Geochemistry & Geophysics
Buchanan C. Kerswell, Matthew J. Kohn, Taras Gerya
Summary: The depth of coupling between the slab and mantle in subduction zones is influenced by the thermal structure of the backarc and the thermal parameter of the slab. The depth of coupling is strongly correlated with the thickness of the backarc lithosphere and weakly correlated with the slab thermal parameter.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2021)
Article
Geochemistry & Geophysics
K. M. Harvey, S. Walker, P. G. Starr, S. C. Penniston-Dorland, M. J. Kohn, E. F. Baxter
Summary: The study used Sm-Nd garnet geochronology to determine the timing of peak metamorphism in garnet amphibolite tectonic blocks from the melange zone. The ages do not correlate with peak metamorphic temperature, indicating that melange formation lasted at least 8 million years from 116 to 108 Ma. Cooling occurred after melange formation, with a potential underplating event between 109 and 108 Ma.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2021)
Article
Geosciences, Multidisciplinary
Huixia Ding, Zeming Zhang, Matthew J. Kohn
Summary: Systematic petrologic, geochemical, and geochronologic data of amphibole-bearing anorthosite and diorite from the Gangdese arc in southern Tibet were reported. The rocks are believed to be derived from hydrous anatexis of the early Late Cretaceous juvenile lower crust, indicating the significant role of subduction and dehydration in the thickening and evolution of the Gangdese arc's lower crust.
Article
Geography, Physical
Matthew J. Kohn, Kathleen B. Springer, Jeffrey S. Pigati, Linda M. Reynard, Amanda E. Drewicz, Justin Crevier, Eric Scott
Summary: This study suggests that the relatively wet hydroclimate conditions in the southern Nevada's Las Vegas Valley during the late Pleistocene were likely driven by winter precipitation. The lower proportion of C4 grasses in the diet of herbivores during this time may be attributed to dietary competition among the diverse and abundant Pleistocene fauna.
QUATERNARY SCIENCE REVIEWS
(2022)
Article
Geochemistry & Geophysics
Mayara F. Cizina, T. Dylan Mikesell, Matthew J. Kohn
Summary: Raman spectroscopy is commonly used to identify mineral and fluid inclusions in host crystals and calculate pressure-temperature conditions for thermobarometric applications. This study aims to determine the reproducibility of Raman peak position measurements for quartz and zircon inclusions, as well as to identify optimal measurement conditions. The results provide important insights for interlaboratory comparisons and improve the accuracy of elastic thermobarometry.
AMERICAN MINERALOGIST
(2023)
Article
Geochemistry & Geophysics
Buchanan C. C. Kerswell, Matthew J. J. Kohn, Taras V. V. Gerya
Summary: Bodies of rock recovered from subducting oceanic plates at Earth's surface provide valuable records of rock processing along subduction interfaces, but comparing the rock record with numerical simulations of subduction reveals inconsistencies. This study uses a classification algorithm to identify rock recovery in numerical simulations and finds correlations between recovery pressures, convergence velocity, and plate age. The results also suggest discrepancies between the recovered markers and the rock record, possibly due to modeling uncertainties or sampling biases.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2023)
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)