All abstracts by Takayuki Ushikubo in conference series: Goldschmidt

(2025) Magma Evolution Toward a Caldera-Forming Eruption at Kikai Caldera; A Study of Submarine Cores
Hanyu T, Shimizu K, Ushikubo T, Hamada M, Chang Q, Hagiwara Y, Yamamoto J, Kaneko K, Nakaoka R, Kiyosugi K & Seama N

(2025) Development of Basaltic Glass Reference Materials for Volatile Element Analysis (H₂O, CO₂, S, Cl, F) and Investigation of Water-Induced C Ionization Suppression in Silicate Glasses Using SIMS
Moussallam Y, Towbin H, Plank T, Bureau H, Khodja H, Yunbin G, Baker MB, Stolper E, Naab F, Monteleone BD, Gaetani G, Shimizu K, Lee H, Ushikubo T, Ding S, Shi S & Rose-Koga EF

(2025) Helium, Oxygen and Hydrogen Isotope Constraints on Magmatic Degassing and Melt Evolution of the 2022 Hunga Eruption
Kim S, Lee H, Kim D, Lee W, Park S-H, Takahata N, Shimizu K, Ushikubo T, Sano Y & Fischer TP

(2024) Systematic Analyses of Volatile Abundances, Hydrogen and Sulfur Isotope Ratios of Melt Inclusions
Ushikubo T & Shimizu K

(2024) In situ Sulfur Isotope Analysis of Archean Basalts Associated with the Belingwe Komatiite: Implications for Recycling of Oceanic Lithosphere
Kubota Y, Ushikubo T, Shimizu K, Ishikawa A & Ueno Y

(2022) Large Contribution of Oxygen to Organic Matter Degradation during the Ediacaran Shuram Excursion
Matsu'ura F, Sawaki Y, Komiya T, Ushikubo T, Shimizu K & Ueno Y

(2021) Highly Enriched and Depleted Melt Sources in Mantle Plumes Recorded in Olivine-Hosted Melt Inclusions in Raivavae Ocean Island Basalts
Hanyu T, Shimizu K, Ushikubo T, Kimura J-I, Chang Q & Hamada M

(2020) Extremely High Volatiles of Petit-Spot
Hirano N, Katsuragi Y, Ushikubo T & Shimizu K

(2020) Verification and Correction of Matrix Effect on Water Concentration of Volcanic Glasses by SIMS
Shimizu K, Ushikubo T, Kuritani T, Hirano N & Yamashita S

(2020) Extreme Sulfur Isotope Fractionation in the Seafloor Hydrothermal Deposit of the Okinawa Trough Revealed by SIMS in situ Analysis
Nozaki T, Nagase T, Ushikubo T & Shimizu K

(2019) Early Condensation History from Two Ultrarefractory Inclusions
Kimura M, Komatsu M, Ushikubo T, Imae N & Yamaguchi A

(2019) Total Carbon Dioxide in Melt Inclusions with Shrinkage Bubbles
Hanyu T, Yamamoto J, Kimoto K, Nakamura Y, Shimizu K & Ushikubo T

(2018) Zircon Evidence for Eclogite Facies Metamorphism at 3.9 Ga
Cavosie AJ, Spencer C, Evans NJ, McDonald B, Reddy SM, Wilde SA, Talavera C, Cameron EM, Valley JW, Fournelle J & Ushikubo T

(2018) Two Distinct Chondrule Generations in Acfer 094 Based on ²⁶Al-Ages and Oxygen Isotope Ratios
Hertwig AT, Kimura M, Ushikubo T, Defouilloy C & Kita NT

(2018) Volatile Concentrations and Hydrogen Isotope Ratios of Submarine Glasses from Loihi and Kilauea
Shimizu K, Ushikubo T & Kaneoka I

(2016) Significant Uplift of the Forearc at the Subduction Initiation Inferred from Volcanic Glasses in the Bonin Forearc (IODP Expedition 352)
Shimizu K & Ushikubo T

(2016) Hydrogen Isotope Analyses of Forearc Volcanic Glasses from IODP Exp. 352 Using IMS 1280-HR
Ushikubo T, Shimizu K & Ueno Y

(2016) Instrumental Biases for SIMS Magnesium Isotope Analyses
Kita NT, Ushikubo T, Tenner TJ, Romaniello SJ & Wadhwa M

(2015) Consistent Occurrence of Moderately Elevated δ¹⁸O Magmas in Acasta Gneiss Complex from 4.0 to 3.5 Ga
Ushikubo T, Iizuka T, Spicuzza MJ & Valley JW

(2014) Lunar Zircons
Valley J, Spicuzza M & Ushikubo T

(2014) Mixing of Solid Precursors during Formation of FeO-Poor Chondrules in CR3 Chondrites
Tenner T, Nakashima D, Ushikubo T, Kita N & Weisberg M

(2014) Oxygen Isotope Systematics of Chondrules Among Chondrite Groups
Kita NT, Ushikubo T, Tenner TJ & Nakashima D

(2013) Tomography at Single-Atom Scale of ²⁰⁷Pb and ²⁰⁶Pb in a 4374 Ma Zircon
Valley J, Ushikubo T, Cavosie A, Reinhard D, Lawrence D, Martin I, Larson D, Clifton P, Kelly T, Wilde S, Moser D & Spicuzza M

(2013) Coupled Isotopic and Textural Evidence for the Biogenicity of 3.4 Gyrs Old Cell-Like Structures
Lepot K, Williford KH, Ushikubo T, Sugitani K, Mimura K, Spicuzza MJ & Valley JW

(2012) SIMS Carbon Isotope Analysis of Proterozoic Microfossils
Williford K, Ushikubo T, Schopf JW, Lepot K, Kitajima K & Valley J

(2011) Lunar Zircon: Primitive δ¹⁸O of Dry Evolved and Mafic Magmas
Valley J, Spicuzza M & Ushikubo T

(2011) Transitional Oxygenation Recorded in the Paleoproterozoic Turee Creek Group, Western Australia
Williford K, Van Kranendonk M, Ushikubo T, Kozdon R & Valley J

(2010) Recent Progress of Small Spot Oxygen Isotope Analysis at WiscSIMS
Ushikubo T, Kita NT & Valley JW

(2010) Eel Larvae may Hatch in the Surface Layer Near the West Mariana Ridge: Ion Microprobe δ¹⁸O Analysis with 7 μm Spatial Resolution in Glass Eel Otoliths
Shirai K, Otake T, Kuroki M, Ushikubo T, Kita N, Amano Y, Tsukamoto K & Valley J

(2010) Low δ¹⁸O(Zrc) in Plagiogranites at Oman: Evidence for Remelting
Grimes CB, Ushikubo T & Valley JW

(2009) Oxygen Isotopic Ratio of Ocean Zircon
Grimes C, Ushikubo T, John B & Valley J

(2009) Accurate Stable Isotope Analysis by Ion Microprobe
Valley J, Kita N, Ushikubo T, Huberty J, Kozdon R, Page Z, Heck P & Fu B

(2008) Imagery-Correlated High Precision Stable Isotope Analysis
Valley J, Kita N, Ushikubo T, Orland I & Kozdon R

(2008) Internal Isochron of CAI Using High Precision SIMS Mg Isotope Analyses
Kita NT, Ushikubo T, Fournelle J, Knight KB, Mendybaev RA, Davis AM & Richter FM

(2008) Lithium in Jack Hills Zircon: Evidence for Extreme Weathering of Earth’s Crust at 4300 Ma
Ushikubo T, Kita NT, Cavosie AJ, Wilde SA, Rudnick RL & Valley JW

(2008) Intratest Oxygen Isotope Variability in Planktonic Foraminifera: New Insights from in situ Measurements by Ion Microprobe
Kozdon R, Ushikubo T, Kita N & Valley J

(2007) Sub-Micrometer Size High Precision Analysis of δ¹⁸O in Zircon by SIMS
Ushikubo T, Page FZ, Kita NT, Riciputi LR & Valley JW

(2003) An Ultra-Refractory Nodule in an Allende Fine-Grained Inclusion: Isotopic Studies Using SIMS
Ushikubo T, Hiyagon H, Kimura M & Hashimoto A

(2002) Mg Isotopic Compositions of W-L and Accretionary Rims of CAIs
Ushikubo T, Hirai K & Hiyagon H