Article
Geochemistry & Geophysics
Merislava Anguelova, Manuela A. Fehr, Eiichi Takazawa, Maria Schoenbaechler
Summary: Titanium isotopes are a promising tracer for magmatic processes, and there are variations in titanium isotopes in mantle rocks. High heavy titanium isotopes might originate from metasomatism in the mantle wedge.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Multidisciplinary Sciences
Tetsuya Yokoyama, Kazuhide Nagashima, Izumi Nakai, Edward D. Young, Yoshinari Abe, Jerome Aleon, Conel M. O'D. Alexander, Sachiko Amari, Yuri Amelin, Ken-ichi Bajo, Martin Bizzarro, Audrey Bouvier, Richard W. Carlson, Marc Chaussidon, Byeon-Gak Choi, Nicolas Dauphas, Andrew M. Davis, Tommaso Di Rocco, Wataru Fujiya, Ryota Fukai, Ikshu Gautam, Makiko K. Haba, Yuki Hibiya, Hiroshi Hidaka, Hisashi Homma, Peter Hoppe, Gary R. Huss, Kiyohiro Ichida, Tsuyoshi Iizuka, Trevor R. Ireland, Akira Ishikawa, Motoo Ito, Shoichi Itoh, Noriyuki Kawasaki, Noriko T. Kita, Kouki Kitajima, Thorsten Kleine, Shintaro Komatani, Alexander N. Krot, Ming-Chang Liu, Yuki Masuda, Kevin D. McKeegan, Mayu Morita, Kazuko Motomura, Frederic Moynier, Ann Nguyen, Larry Nittler, Morihiko Onose, Andreas Pack, Changkun Park, Laurette Piani, Liping Qin, Sara S. Russell, Naoya Sakamoto, Maria Schoenbaechler, Lauren Tafla, Haolan Tang, Kentaro Terada, Yasuko Terada, Tomohiro Usui, Sohei Wada, Meenakshi Wadhwa, Richard J. Walker, Katsuyuki Yamashita, Qing-Zhu Yin, Shigekazu Yoneda, Hiroharu Yui, Ai-Cheng Zhang, Harold C. Connolly Jr, Dante S. Lauretta, Tomoki Nakamura, Hiroshi Naraoka, Takaaki Noguchi, Ryuji Okazaki, Kanako Sakamoto, Hikaru Yabuta, Masanao Abe, Masahiko Arakawa, Atsushi Fujii, Masahiko Hayakawa, Naoyuki Hirata, Naru Hirata, Rie Honda, Chikatoshi Honda, Satoshi Hosoda, Yu-ichi Iijima, Hitoshi Ikeda, Masateru Ishiguro, Yoshiaki Ishihara, Takahiro Iwata, Kosuke Kawahara, Shota Kikuchi, Kohei Kitazato, Koji Matsumoto, Moe Matsuoka, Tatsuhiro Michikami, Yuya Mimasu, Akira Miura, Tomokatsu Morota, Satoru Nakazawa, Noriyuki Namiki, Hirotomo Noda, Rina Noguchi, Naoko Ogawa, Kazunori Ogawa, Tatsuaki Okada, Chisato Okamoto, Go Ono, Masanobu Ozaki, Takanao Saiki, Naoya Sakatani, Hirotaka Sawada, Hiroki Senshu, Yuri Shimaki, Kei Shirai, Seiji Sugita, Yuto Takei, Hiroshi Takeuchi, Satoshi Tanaka, Eri Tatsumi, Fuyuto Terui, Yuichi Tsuda, Ryudo Tsukizaki, Koji Wada, Sei-ichiro Watanabe, Manabu Yamada, Tetsuya Yamada, Yukio Yamamoto, Hajime Yano, Yasuhiro Yokota, Keisuke Yoshihara, Makoto Yoshikawa, Kent Yoshikawa, Shizuho Furuya, Kentaro Hatakeda, Tasuku Hayashi, Yuya Hitomi, Kazuya Kumagai, Akiko Miyazaki, Aiko Nakato, Masahiro Nishimura, Hiromichi Soejima, Ayako Suzuki, Toru Yada, Daiki Yamamoto, Kasumi Yogata, Miwa Yoshitake, Shogo Tachibana, Hisayoshi Yurimoto
Summary: Carbonaceous meteorites from C-type asteroids were examined using samples from asteroid (162173) Ryugu. The samples resemble carbonaceous chondrite meteorites, particularly the CI group, and are made up of minerals formed in aqueous fluids. These minerals were altered at a temperature of 37 degrees Celsius about 5.2 million years after the formation of the first solids in the Solar System. The Ryugu samples have a composition similar to the Sun's photosphere.
Article
Instruments & Instrumentation
H. L. Capelo, J. Kuehn, A. Pommerol, D. Piazza, M. Braendli, R. Cerubini, B. Jost, J-D Bodenan, T. Planchet, S. Spadaccia, R. Schraepler, J. Blum, M. Schoenbaechler, L. Mayer, N. Thomas
Summary: The field of planetary system formation relies on our understanding of the aerodynamic interaction between gas and dust in protoplanetary disks. The study of particle dynamics and rarefied gas under micro-gravity conditions can provide valuable insights. This research is important for understanding dust emission and interpreting previous datasets, as well as preparing for future spacecraft observations.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2022)
Article
Geochemistry & Geophysics
Nao Nakanishi, Igor S. Puchtel, Richard J. Walker, Peter I. Nabelek
Summary: This study examines the positive W-182 anomalies in the upper mantle using Neoarchean and Paleoproterozoic rocks from the Black Hills in South Dakota, USA. The research finds that the anomalies decreased and nearly disappeared by the end of the Archean, likely due to mantle mixing processes. The specific mechanism behind this process needs further exploration through geodynamical modeling.
Article
Geochemistry & Geophysics
Hope A. Tornabene, Richard D. Ash, Richard J. Walker, Katherine R. Bermingham
Summary: The IC iron meteorite group is characterized by its mass-independent isotopic compositions and 182W age constraints, as well as siderophile element concentrations and modeling of crystal-liquid fractionation processes. The six IC irons analyzed have similar genetic isotopic compositions and are believed to have originated from the same parent body in the non-carbonaceous nebular reservoir. The abundances of siderophile elements in the IC irons are generally similar and show minor depletions in the more volatile siderophile elements. The initial parent body core was S-rich, and additional processes such as late-stage modification and metal-melt mixing are required to explain the range of highly siderophile element abundances within the first 100 million years of the Solar System's history.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Astronomy & Astrophysics
Marine Paquet, Frederic Moynier, Tetsuya Yokoyama, Wei Dai, Yan Hu, Yoshinari Abe, Jerome Aleon, Conel M. O'D. Alexander, Sachiko Amari, Yuri Amelin, Ken-ichi Bajo, Martin Bizzarro, Audrey Bouvier, Richard W. Carlson, Marc Chaussidon, Byeon-Gak Choi, Nicolas Dauphas, Andrew M. Davis, Tommaso Di Rocco, Wataru Fujiya, Ryota Fukai, Ikshu Gautam, Makiko K. Haba, Yuki Hibiya, Hiroshi Hidaka, Hisashi Homma, Peter Hoppe, Gary R. Huss, Kiyohiro Ichida, Tsuyoshi Iizuka, Trevor R. Ireland, Akira Ishikawa, Motoo Ito, Shoichi Itoh, Noriyuki Kawasaki, Noriko T. Kita, Kouki Kitajima, Thorsten Kleine, Shintaro Komatani, Alexander N. Krot, Ming-Chang Liu, Yuki Masuda, Kevin D. McKeegan, Mayu Morita, Kazuko Motomura, Izumi Nakai, Kazuhide Nagashima, David Nesvorny, Ann N. Nguyen, Larry Nittler, Morihiko Onose, Andreas Pack, Changkun Park, Laurette Piani, Liping Qin, Sara S. Russell, Naoya Sakamoto, Maria Schoenbaechler, Lauren Tafla, Haolan Tang, Kentaro Terada, Yasuko Terada, Tomohiro Usui, Sohei Wada, Meenakshi Wadhwa, Richard J. Walker, Katsuyuki Yamashita, Qing-Zhu Yin, Shigekazu Yoneda, Edward D. Young, Hiroharu Yui, Ai-Cheng Zhang, Tomoki Nakamura, Hiroshi Naraoka, Takaaki Noguchi, Ryuji Okazaki, Kanako Sakamoto, Hikaru Yabuta, Masanao Abe, Akiko Miyazaki, Aiko Nakato, Masahiro Nishimura, Tatsuaki Okada, Toru Yada, Kasumi Yogata, Satoru Nakazawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Yuichi Tsuda, Sei-ichiro Watanabe, Makoto Yoshikawa, Shogo Tachibana, Hisayoshi Yurimoto
Summary: Initial analyses indicate that asteroid Ryugu has a composition similar to CI carbonaceous chondrites, which are the most primitive meteorites. However, further research is needed to establish the exact relationship. A recently conducted study reveals that Ryugu and CI chondrites share the same zinc and copper isotopic composition, suggesting a common genetic heritage between them. Additionally, the study suggests that Ryugu-like material might have contributed to Earth's budgets of certain elements.
Article
Astronomy & Astrophysics
Laurette Piani, Kazuhide Nagashima, Noriyuki Kawasaki, Naoya Sakamoto, Ken-ichi Bajo, Yoshinari Abe, Jerome Aleon, Conel M. O'D. Alexander, Sachiko Amari, Yuri Amelin, Martin Bizzarro, Audrey Bouvier, Richard W. Carlson, Marc Chaussidon, Byeon-Gak Choi, Nicolas Dauphas, Andrew M. Davis, Tommaso Di Rocco, Wataru Fujiya, Ryota Fukai, Ikshu Gautam, Makiko K. Haba, Yuki Hibiya, Hiroshi Hidaka, Hisashi Homma, Peter Hoppe, Gary R. Huss, Kiyohiro Ichida, Tsuyoshi Iizuka, Trevor R. Ireland, Akira Ishikawa, Shoichi Itoh, Noriko T. Kita, Kouki Kitajima, Thorsten Kleine, Shintaro Komatani, Alexander N. Krot, Ming-Chang Liu, Yuki Masuda, Kevin D. McKeegan, Mayu Morita, Kazuko Motomura, Frederic Moynier, Izumi Nakai, Ann Nguyen, Larry Nittler, Morihiko Onose, Andreas Pack, Changkun Park, Liping Qin, Sara S. Russell, Maria Schoenbaechler, Lauren Tafla, Haolan Tang, Kentaro Terada, Yasuko Terada, Tomohiro Usui, Sohei Wada, Meenakshi Wadhwa, Richard J. Walker, Katsuyuki Yamashita, Qing-Zhu Yin, Tetsuya Yokoyama, Shigekazu Yoneda, Edward D. Young, Hiroharu Yui, Ai-Cheng Zhang, Tomoki Nakamura, Hiroshi Naraoka, Ryuji Okazaki, Kanako Sakamoto, Hikaru Yabuta, Masanao Abe, Akiko Miyazaki, Aiko Nakato, Masahiro Nishimura, Tatsuaki Okada, Toru Yada, Kasumi Yogata, Satoru Nakazawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Yuichi Tsuda, Sei-ichiro Watanabe, Makoto Yoshikawa, Shogo Tachibana, Hisayoshi Yurimoto
Summary: Rock fragments from the Cb-type asteroid Ryugu, brought back to Earth by the JAXA Hayabusa2 mission, exhibit similarities in mineralogy, chemistry, and isotopic properties to the Ivuna-type (CI) carbonaceous chondrites. These fragments, similar to CI chondrites, have undergone extensive alteration in the presence of liquid water and consist mainly of hydrous minerals. An in situ survey using secondary ion mass spectrometry reveals that the D/H ratio of Ryugu's hydrous minerals, D/H-Ryugu, is estimated to be [165 +/- 19] x 10(-6), corresponding to delta D-Ryugu = +59 +/- 121 parts per thousand (2 sigma). The similar D/H-Ryugu values at the two sampling sites on Ryugu, as well as the similarity with the D/H ratio of hydrous minerals in CI chondrites, further support the link between Ryugu and CI chondrites. Furthermore, by evaluating data and previous studies, it is estimated that CI chondrites contributed approximately 3% to the hydrogen content of Earth's surface reservoirs. Therefore, it is concluded that the water responsible for the alteration of Ryugu's rocks originated from water ice precursors inherited from the interstellar medium, with its hydrogen partially re-equilibrating with nebular H-2 before being accreted onto Ryugu's parent asteroid.
ASTROPHYSICAL JOURNAL LETTERS
(2023)
Article
Geochemistry & Geophysics
Daniel Peters, Hanika Rizo, Richard W. Carlson, Richard J. Walker, Roberta L. Rudnick, Ambre Luguet
Summary: Isotope dilution W whole-rock data is used to study the behavior of W in the continental lithospheric mantle. Tungsten concentrations are found to be high in peridotite samples, even in the most depleted ones. Fractionation of W from Th and U is observed with increasing melt depletion. The findings suggest that W metasomatism and re-equilibration may not be the cause of high W abundances in peridotites.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Geochemistry & Geophysics
Noah Jaggi, Antoine S. G. Roth, Miriam Rufenacht, Maria Schonbachler, Andre Galli
Summary: This study emphasizes the importance of X-ray computed tomography (XCT) in detecting features that significantly affect the isotopic composition of bulk chondrules, including metal and igneous rims, compound chondrules, matrix remnants, and metal contents. XCT can prevent the inclusion of non-chondrule samples and samples with different isotope compositions held together by matrix. It is recommended to perform XCT before chondrule dissolution for isotope analysis as a non-invasive method.
METEORITICS & PLANETARY SCIENCE
(2023)
Correction
Astronomy & Astrophysics
Marine Paquet, Frederic Moynier, Tetsuya Yokoyama, Wei Dai, Yan Hu, Yoshinari Abe, Jerome Aleon, Conel M. O'd. Alexander, Sachiko Amari, Yuri Amelin, Ken-ichi Bajo, Martin Bizzarro, Audrey Bouvier, Richard W. Carlson, Marc Chaussidon, Byeon-Gak Choi, Nicolas Dauphas, Andrew M. Davis, Tommaso Di Rocco, Wataru Fujiya, Ryota Fukai, Ikshu Gautam, Makiko K. Haba, Yuki Hibiya, Hiroshi Hidaka, Hisashi Homma, Peter Hoppe, Gary R. Huss, Kiyohiro Ichida, Tsuyoshi Iizuka, Trevor R. Ireland, Akira Ishikawa, Motoo Ito, Shoichi Itoh, Noriyuki Kawasaki, Noriko T. Kita, Kouki Kitajima, Thorsten Kleine, Shintaro Komatani, Alexander N. Krot, Ming-Chang Liu, Yuki Masuda, Kevin D. McKeegan, Mayu Morita, Kazuko Motomura, Izumi Nakai, Kazuhide Nagashima, David Nesvorny, Ann N. Nguyen, Larry Nittler, Morihiko Onose, Andreas Pack, Changkun Park, Laurette Piani, Liping Qin, Sara S. Russell, Naoya Sakamoto, Maria Schoenbaechler, Lauren Tafla, Haolan Tang, Kentaro Terada, Yasuko Terada, Tomohiro Usui, Sohei Wada, Meenakshi Wadhwa, Richard J. Walker, Katsuyuki Yamashita, Qing-Zhu Yin, Shigekazu Yoneda, Edward D. Young, Hiroharu Yui, Ai-Cheng Zhang, Tomoki Nakamura, Hiroshi Naraoka, Takaaki Noguchi, Ryuji Okazaki, Kanako Sakamoto, Hikaru Yabuta, Masanao Abe, Akiko Miyazaki, Aiko Nakato, Masahiro Nishimura, Tatsuaki Okada, Toru Yada, Kasumi Yogata, Satoru Nakazawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Yuichi Tsuda, Sei-ichiro Watanabe, Makoto Yoshikawa, Shogo Tachibana, Hisayoshi Yurimoto
Article
Geochemistry & Geophysics
Emily M. Chiappe, Richard D. Ash, Richard J. Walker
Summary: Chemical and isotopic analysis of ten iron meteorites from the IIIE group reveals their similarities in terms of bulk siderophile element characteristics, suggesting a common origin through crystal-liquid fractionation. Modeling results indicate the parent melt composition of IIIE group with significantly higher highly siderophile element enrichment compared to non-carbonaceous (NC) chondrite-like parent body, indicating a core comprising a large portion of the parent body. Formation of the anomalous IIIE iron Aletai can be explained through the nonequilibrium mixing of an evolved liquid and early formed solid. The study also provides insights into the nucleosynthetic and metal-silicate segregation ages of IIIE irons and Aletai, suggesting their similarity to other NC-type iron meteorite parent bodies.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Geochemistry & Geophysics
Miriam Ruefenacht, Precillia Morino, Yi-Jen Lai, Manuela A. Fehr, Makiko K. Haba, Maria Schonbachler
Summary: Nucleosynthetic isotope variations play an important role in investigating the genetic relationships between meteorite groups and planets, providing insights into the early evolution of the solar system. This study reports high-precision nucleosynthetic Ti isotope compositions of a wide range of bulk meteorites, confirming the dichotomy observed between carbonaceous chondrites (CC) and non-carbonaceous (NC) meteorites. The data suggest the presence of isotopically heterogeneous reservoirs in the inner disk, indicating different substructures and origins of meteorite groups.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Geochemistry & Geophysics
Marc C. Halfar, Bradley J. Peters, James M. D. Day, Maria Schonbachler
Summary: The Mascarene Islands in the western Indian Ocean are surface expressions of the Reunion hotspot. The lavas from these islands have uniform isotopic composition and may have contributions from different sources. The lavas from Rodrigues Island may contain a unique component that is not found in other islands.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Geochemistry & Geophysics
Emily M. Chiappe, Richard D. Ash, Arto Luttinen, Sari Lukkari, Jukka Kuva, Connor D. Hilton, Richard J. Walker
Summary: The Lieksa meteorite, found in Finland in 2017, is classified as a pallasite due to its silicate content and the texture of metal enclosing the silicates. Its chemical characteristics and composition are distinct from known pallasites and iron meteorite groups, making it an ungrouped meteorite. The age of meteorite formation is estimated to be around 1.5 +/- 0.8 million years after the formation of calcium-aluminum-rich inclusions.
METEORITICS & PLANETARY SCIENCE
(2023)
Article
Chemistry, Analytical
Francois L. H. Tissot, Mauricio Ibanez-Mejia, Savelas A. A. Rabb, Rebecca A. A. Kraft, Robert D. D. Vocke, Manuela A. A. Fehr, Maria Schonbachler, Haolan Tang, Edward D. D. Young
Summary: This article describes a study on zirconium (Zr) stable isotopes and reports the development and calibration of a new ideal isotope reference material called NIST RM 8299.
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
(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)
