Search Results - "KROT, Alexander N"

The Absolute Chronology and Thermal Processing of Solids in the Solar Protoplanetary Disk by Connelly, James N., Bizzarro, Martin, Krot, Alexander N., Nordlund, Åke, Wielandt, Daniel, Ivanova, Marina A.

“…Transient heating events that formed calcium-aluminum-rich inclusions (CAIs) and chondrules are fundamental processes in the evolution of the solar…”
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Isotopic Dichotomy among Meteorites and Its Bearing on the Protoplanetary Disk by Scott, Edward R. D., Krot, Alexander N., Sanders, Ian S.

“…Whole rock Δ17O and nucleosynthetic isotopic variations for chromium, titanium, nickel, and molybdenum in meteorites define two isotopically distinct…”
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Oxygen Isotopic Variations in the Calcium, Aluminum-rich Inclusion–forming Region Recorded by a Single Refractory Inclusion from the CO3.1 Carbonaceous Chondrite Dar al Gani 083 by Ebert, Samuel, Nagashima, Kazuhide, Krot, Alexander N., Patzek, Markus, Bischoff, Addi

“…Calcium, aluminum-rich inclusions (CAIs) are the oldest solids dated that formed in the solar system. Most CAIs in unmetamorphosed chondritic meteorites…”
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Origin of Nucleosynthetic Isotope Heterogeneity in the Solar Protoplanetary Disk by Trinquier, Anne, Elliott, Tim, Ulfbeck, David, Coath, Christopher, Krot, Alexander N, Bizzarro, Martin

“…Stable-isotope variations exist among inner solar system solids, planets, and asteroids, but their importance is not understood. We report correlated,…”
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Isotopic evidence for primordial molecular cloud material in metal-rich carbonaceous chondrites by Van Kooten, Elishevah M. M. E., Wielandt, Daniel, Schiller, Martin, Nagashima, Kazuhide, Thomen, Aurélien, Larsen, Kirsten K., Olsen, Mia B., Nordlund, Åke, Krot, Alexander N., Bizzarro, Martin

“…The short-lived 26Al radionuclide is thought to have been admixed into the initially 26Al-poor protosolar molecular cloud before or contemporaneously with its…”
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Early aqueous activity on the ordinary and carbonaceous chondrite parent bodies recorded by fayalite by Doyle, Patricia M., Jogo, Kaori, Nagashima, Kazuhide, Krot, Alexander N., Wakita, Shigeru, Ciesla, Fred J., Hutcheon, Ian D.

“…Chronology of aqueous activity on chondrite parent bodies constrains their accretion times and thermal histories. Radiometric 53 Mn– 53 Cr dating has been…”
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Oxygen-isotope compositions of chondrule phenocrysts and matrix grains in Kakangari K-grouplet chondrite: Implication to a chondrule-matrix genetic relationship by Nagashima, Kazuhide, Krot, Alexander N., Huss, Gary R.

“…To investigate a possible relationship between chondrules and matrix, we studied mineralogy, mineral chemistry, and in situ O-isotope compositions of…”
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Oxygen and Al‐Mg isotopic compositions of grossite‐bearing refractory inclusions from CO3 chondrites by Simon, Steven B., Krot, Alexander N., Nagashima, Kazuhide

“…The distribution of the short‐lived radionuclide 26Al in the early solar system remains a major topic of investigation in planetary science. Thousands of…”
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26Al-26Mg isotope systematics of the first solids in the early solar system by Kita, Noriko T., Yin, Qing-Zhu, MacPherson, Glenn J., Ushikubo, Takayuki, Jacobsen, Benjamin, Nagashima, Kazuhide, Kurahashi, Erika, Krot, Alexander N., Jacobsen, Stein B.

“…High‐precision bulk aluminum‐magnesium isotope measurements of calcium‐aluminum‐rich inclusions (CAIs) from CV carbonaceous chondrites in several laboratories…”
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First evidence for silica condensation within the solar protoplanetary disk by Komatsu, Mutsumi, Fagan, Timothy J., Krot, Alexander N., Nagashima, Kazuhide, Petaev, Michail I., Kimura, Makoto, Yamaguchi, Akira

“…Calcium-aluminum–rich inclusions (CAIs) and amoeboid olivine aggregates (AOAs), a refractory component of chondritic meteorites, formed in a high-temperature…”
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Constraints on mechanisms of chondrule formation from chondrule precursors and chronology of transient heating events in the protoplanetary disk by Krot, Alexander N., Nagashima, Kazuhide

“…The mineralogy, petrography, and oxygen-isotope compositions of porphyritic chondrules—dominant chondrule type in most chondrite groups—suggest formation by…”
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Variations in the O-isotope composition of gas during the formation of chondrules from the CR chondrites by Schrader, Devin L., Nagashima, Kazuhide, Krot, Alexander N., Ogliore, Ryan C., Hellebrand, Eric

“…To better understand the environment of chondrule formation and constrain the O-isotope composition of the ambient gas in the Renazzo-like carbonaceous (CR)…”
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Remnants of the Early Solar System Water Enriched in Heavy Oxygen Isotopes by Sakamoto, Naoya, Seto, Yusuke, Itoh, Shoichi, Kuramoto, Kiyoshi, Fujino, Kiyoshi, Nagashima, Kazuhide, Krot, Alexander N, Yurimoto, Hisayoshi

“…Oxygen isotopic composition of our solar system is believed to have resulted from mixing of two isotopically distinct nebular reservoirs, ¹⁶O-rich and…”
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The formation of Ca-, Fe-rich silicates in reduced and oxidized CV chondrites: The roles of impact-modified porosity and permeability, and heterogeneous distribution of water ices by MacPherson, Glenn J., Krot, Alexander N.

“…CV (Vigarano type) carbonaceous chondrites, comprising Allende‐like (CVoxA) and Bali‐like (CVoxB) oxidized and reduced (CVred) subgroups, experienced differing…”
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Oxygen isotopic constraints on the origin of magnesian chondrules and on the gaseous reservoirs in the early Solar System by Chaussidon, Marc, Libourel, Guy, Krot, Alexander N.

“…We report in situ ion microprobe analyses of the oxygen isotopic composition of the major silicate phases (olivine, low-Ca pyroxene, silica, and mesostasis) of…”
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Mineralogy, Petrology, and Oxygen-isotope Compositions of Magnetite ± Fayalite Assemblages in CO3, CV3, and LL3 Chondrites by Krot, Alexander N, Doyle, Patricia M., Nagashina, Kazuhide, Dobrica, Elena, Petaev, Michail I.

“…We report on the mineralogy, petrology, and O-isotope compositions of magnetite and fayalite (Fa90−100) from several metasomatically altered and weakly…”
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Infiltration metasomatism of the Allende coarse-grained calcium-aluminum-rich inclusions by Krot, Alexander N., Petaev, Michail I., Nagashima, Kazuhide

“…We report on the mineralogy, petrography, and O and Al-Mg isotopic systematics of secondary mineralization in the metasomatically altered igneous Ca,Al-rich…”
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Oxygen- and magnesium-isotope compositions of calcium–aluminum-rich inclusions from CR2 carbonaceous chondrites by Makide, Kentaro, Nagashima, Kazuhide, Krot, Alexander N., Huss, Gary R., Hutcheon, Ian D., Bischoff, Addi

“…We report both oxygen- and magnesium-isotope compositions measured in situ using a Cameca ims-1280 ion microprobe in 20 of 166 CAIs identified in 47 polished…”
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Bringing Part of an Asteroid Back Home by Krot, Alexander N.

“…A space mission that took samples of an asteroid has provided insights into the evolution of the solar system. Meteorites are the oldest rocks in our solar…”
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Oxygen isotopic compositions of chondrules from the metal-rich chondrites Isheyevo (CH/CB b), MAC 02675 (CB b) and QUE 94627 (CB b) by Krot, Alexander N., Nagashima, Kazuhide, Yoshitake, Miwa, Yurimoto, Hisayoshi

“…It has been recently suggested that (1) CH chondrites and the CB b/CH-like chondrite Isheyevo contain two populations of chondrules formed by different…”
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