start-ver=1.4
cd-journal=joma
no-vol=334
cd-vols=
no-issue=
article-no=
start-page=105475
end-page=
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2019
dt-pub=201911
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Tourmaline in a Mesoarchean pelagic hydrothermal system: Implications for the habitat of early life
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract= The RNA World hypothesis requires the synthesis of RNA to allow the emergence of life on Earth. Hydrothermal systems have been proposed as potential candidates for constructing complex biomolecules. However, in order to successfully form RNA, it is necessary to stabilize ribose, a RNA carbohydrate component. Borate has been found to stabilize ribose. Therefore, boron rich hydrothermal systems are important environments concerning the origin of life on Earth.
The 3.2-Ga Dixon Island Formation of the West Pilbara Superterrane, Western Australia, is a volcano-sedimentary sequence. The Formation represents a Mesoarchean pelagic hydrothermal system, which formed adjacent to an immature island arc. Fine-grained tourmaline, in addition to biogenic carbonaceous matter and spherulitic and tubular bacteriomorphs, are found in black chert. A boron-rich environment was responsible for the formation of these deposits. To explore the implications of such a boron enriched environment on microbial activity, modes of occurrence and chemical compositions of the tourmaline were examined.
The tourmaline is schorl or dravite of the alkali tourmaline group and the boron isotope compositions range in ƒÂ11B from -7.3 to +2.6ñ. The tourmaline occurs in microcrystalline quartz matrix of black chert veins that cross cut a volcanic unit and also in a bedded black chert, which overlays the volcanic unit. The volcanic unit contains highly altered zones with hydrothermal veins. The associated lithologic and stratigraphic features suggest that the black chert veins were the conduits for upward moving hydrothermal fluids, which reached the sea floor. Subsequently, the volcanic unit was covered by organic matter-rich cherty sediments that in part were fed, and/or altered, by the hydrothermal fluids.
These results suggest that the origin of boron enrichment to form Dixon Island tourmaline is not the associated sedimentary mineral assemblage, which includes diagenetic clay, low-grade metamorphic mica, and organic matter. Instead, the tourmaline was directly precipitated from hydrothermal fluid, enriched in boron. Furthermore, the hydrothermal fluids had already concentrated the boron, in the Mesoarchean pelagic system, prior to the apex of organic matter production and microbial activity. Our findings support a hypothesis that the boron-enriched hydrothermal environment aided the survival and evolution of early life.
en-copyright=
kn-copyright=
en-aut-name=OtaTsutomu
en-aut-sei=Ota
en-aut-mei=Tsutomu
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=
en-aut-name=AiharaYuhei
en-aut-sei=Aihara
en-aut-mei=Yuhei
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=
en-aut-name=KiyokawaShoichi
en-aut-sei=Kiyokawa
en-aut-mei=Shoichi
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=
en-aut-name=TanakaRyoji
en-aut-sei=Tanaka
en-aut-mei=Ryoji
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=
en-aut-name=NakamuraEizo
en-aut-sei=Nakamura
en-aut-mei=Eizo
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=5
ORCID=
affil-num=1
en-affil=Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Planetary Materials, Okayama University
kn-affil=
affil-num=2
en-affil=Department of Earth and Planetary Sciences, Kyushu University
kn-affil=
affil-num=3
en-affil=Department of Earth and Planetary Sciences, Kyushu University
kn-affil=
affil-num=4
en-affil=Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Planetary Materials, Okayama University
kn-affil=
affil-num=5
en-affil=The Pheasant Memorial Laboratory, Institute for Planetary Materials, Okayama University
kn-affil=
en-keyword=Mesoarchean
kn-keyword=Mesoarchean
en-keyword=Hydrothermal system
kn-keyword=Hydrothermal system
en-keyword=Early life
kn-keyword=Early life
en-keyword=Boron
kn-keyword=Boron
en-keyword=Tourmaline
kn-keyword=Tourmaline
END
start-ver=1.4
cd-journal=joma
no-vol=252
cd-vols=
no-issue=
article-no=
start-page=107
end-page=125
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2019
dt-pub=20190501
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Lithium- and oxygen-isotope compositions of chondrule constituents in the Allende meteorite
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract= We report in situ ion-microprobe analyses of Li- and O-isotope compositions for olivine, low-Ca pyroxene, high-Ca pyroxene, and chondrule mesostasis/plagioclase in nine chondrules from the Allende CV3 chondrite. Based on their mineralogy and O-isotope compositions, we infer that the chondrule mesostasis/plagioclase and ferroan olivine rims were extensively modified or formed during metasomatic alteration and metamorphism on the Allende parent asteroid. We excluded these minerals in order to determine the correlations between Li and both O and the chemical compositions of olivines and low-Ca pyroxenes in the chondrules and their igneous rims. Based on the O-isotope composition of the olivines, nine chondrules were divided into three groups. Average ƒ¢17O of olivines (Fo>65) in group 1 and 2 chondrules are ?5.3?}?0.4 and ?6.2?}?0.4ñ, respectively. Group 3 chondrules are characterized by the presence of 16O-rich relict grains and the ƒ¢17O of their olivines range from ?23.7 to ?6.2ñ. In group 1 olivines, as Fa content increases, variation of ƒÂ7Li becomes smaller and ƒÂ7Li approaches the whole-rock value (2.4ñ; Seitz et al., 2012), suggesting nearly complete Li-isotope equilibration. In group 2 and 3 olivines, variation of ƒÂ7Li is limited even with a significant range of Fa content. We conclude that Li-isotope compositions of olivine in group 1 chondrules were modified not by an asteroidal process but by an igneous-rim formation process, thus chondrule olivines retained Li-isotope compositions acquired in the protosolar nebula. In olivines of the group 3 chondrule PO-8, we observed a correlation between O and Li isotopes: In relict 16O-rich olivine grains with ƒ¢17O of ??25 to ?20ñ, ƒÂ7Li ranges from ?23 to ?3ñ; in olivine grains with ƒ¢17O?>??20ñ, ƒÂ7Li is nearly constant (?8?}?4ñ). Based on the Li-isotope composition of low-Ca pyroxenes, which formed from melt during the crystallization of host chondrules and igneous rims, the existence of a gaseous reservoir with a ƒÂ7Li????11ñ is inferred.
en-copyright=
kn-copyright=
en-aut-name=KunihiroTakuya
en-aut-sei=Kunihiro
en-aut-mei=Takuya
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=
en-aut-name=OtaTsutomu
en-aut-sei=Ota
en-aut-mei=Tsutomu
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=
en-aut-name=NakamuraEizo
en-aut-sei=Nakamura
en-aut-mei=Eizo
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=
affil-num=1
en-affil=The Pheasant Memorial Laboratory, Institute for Planetary Materials, Okayama University
kn-affil=
affil-num=2
en-affil=The Pheasant Memorial Laboratory, Institute for Planetary Materials, Okayama University
kn-affil=
affil-num=3
en-affil=The Pheasant Memorial Laboratory, Institute for Planetary Materials, Okayama University
kn-affil=
en-keyword=Lithium
kn-keyword=Lithium
en-keyword=Oxygen
kn-keyword=Oxygen
en-keyword=Chondrule
kn-keyword=Chondrule
en-keyword=Chondrite
kn-keyword=Chondrite
en-keyword=Asteroid
kn-keyword=Asteroid
en-keyword=Allende
kn-keyword=Allende
en-keyword=Igneous rim
kn-keyword=Igneous rim
en-keyword=SIMS
kn-keyword=SIMS
END
start-ver=1.4
cd-journal=joma
no-vol=95
cd-vols=
no-issue=4
article-no=
start-page=165
end-page=177
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2019
dt-pub=20190411
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Hypervelocity collision and water-rock interaction in space preserved in the Chelyabinsk ordinary chondrite
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=A comprehensive geochemical study of the Chelyabinsk meteorite reveals further details regarding its history of impact-related fragmentation and melting, and later aqueous alteration, during its transit toward Earth. We support an similar to 30 Ma age obtained by Ar-Ar method (Beard et al., 2014) for the impact-related melting, based on Rb-Sr isotope analyses of a melt domain. An irregularly shaped olivine with a distinct 0 isotope composition in a melt domain appears to be a fragment of a silicate-rich impactor. Hydrogen and Li concentrations and isotopic compositions, textures of Fe oxyhydroxides, and the presence of organic materials located in fractures, are together consistent with aqueous alteration, and this alteration could have pre-dated interaction with the Earth's atmosphere. As one model, we suggest that hypervelocity capture of the impact-related debris by a comet nucleus could have led to shock-wave-induced supercritical aqueous fluids dissolving the silicate, metallic, and organic matter, with later ice sublimation yielding a rocky rubble pile sampled by the meteorite.
en-copyright=
kn-copyright=
en-aut-name=NakamuraEizo
en-aut-sei=Nakamura
en-aut-mei=Eizo
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=
en-aut-name=KunihiroTak
en-aut-sei=Kunihiro
en-aut-mei=Tak
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=
en-aut-name=OtaTsutomu
en-aut-sei=Ota
en-aut-mei=Tsutomu
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=
en-aut-name=SakaguchiChie
en-aut-sei=Sakaguchi
en-aut-mei=Chie
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=
en-aut-name=TanakaRyoji
en-aut-sei=Tanaka
en-aut-mei=Ryoji
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=5
ORCID=
en-aut-name=KitagawaHiroshi
en-aut-sei=Kitagawa
en-aut-mei=Hiroshi
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=6
ORCID=
en-aut-name=KobayashiKatsura
en-aut-sei=Kobayashi
en-aut-mei=Katsura
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=7
ORCID=
en-aut-name=YamanakaMasahiro
en-aut-sei=Yamanaka
en-aut-mei=Masahiro
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=8
ORCID=
en-aut-name=ShimakiYuri
en-aut-sei=Shimaki
en-aut-mei=Yuri
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=9
ORCID=
en-aut-name=BeboutGray E.
en-aut-sei=Bebout
en-aut-mei=Gray E.
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=10
ORCID=
en-aut-name=MiuraHitoshi
en-aut-sei=Miura
en-aut-mei=Hitoshi
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=11
ORCID=
en-aut-name=YamamotoTetsuo
en-aut-sei=Yamamoto
en-aut-mei=Tetsuo
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=12
ORCID=
en-aut-name=MalkovetsVladimir
en-aut-sei=Malkovets
en-aut-mei=Vladimir
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=13
ORCID=
en-aut-name=GrokhovskyVictor
en-aut-sei=Grokhovsky
en-aut-mei=Victor
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=14
ORCID=
en-aut-name=KorolevaOlga
en-aut-sei=Koroleva
en-aut-mei=Olga
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=15
ORCID=
en-aut-name=LitasovKonstantin
en-aut-sei=Litasov
en-aut-mei=Konstantin
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=16
ORCID=
affil-num=1
en-affil=The Pheasant Memorial Laboratory, Institute for Planetary Materials, Okayama University
kn-affil=
affil-num=2
en-affil=The Pheasant Memorial Laboratory, Institute for Planetary Materials, Okayama University
kn-affil=
affil-num=3
en-affil=The Pheasant Memorial Laboratory, Institute for Planetary Materials, Okayama University
kn-affil=
affil-num=4
en-affil=The Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Planetary Materials, Okayama University
kn-affil=
affil-num=5
en-affil=The Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Planetary Materials, Okayama University
kn-affil=
affil-num=6
en-affil=Okayama Univ, Inst Planetary Mat, Pheast Mem Lab Geochem & Cosmochem
kn-affil=
affil-num=7
en-affil=The Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Planetary Materials, Okayama University
kn-affil=
affil-num=8
en-affil=The Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Planetary Materials, Okayama University
kn-affil=
affil-num=9
en-affil=The Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Planetary Materials, Okayama University
kn-affil=
affil-num=10
en-affil=The Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Planetary Materials, Okayama University
kn-affil=
affil-num=11
en-affil=Graduate School of Natural Sciences, Nagoya City University
kn-affil=
affil-num=12
en-affil=Institute of Low Temperature Science, Hokkaido University
kn-affil=
affil-num=13
en-affil=The Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Planetary Materials, Okayama University
kn-affil=
affil-num=14
en-affil=Institute of Physics and Technology, Ural Federal University
kn-affil=
affil-num=15
en-affil=Institute of Mineralogy, Ural Branch of the Russian Academy of Sciences South-Ural State University
kn-affil=
affil-num=16
en-affil=V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences
kn-affil=
en-keyword=ordinary chondrite
kn-keyword=ordinary chondrite
en-keyword=chronology
kn-keyword=chronology
en-keyword=geochemistry
kn-keyword=geochemistry
en-keyword=impact melting
kn-keyword=impact melting
en-keyword=asteroid
kn-keyword=asteroid
en-keyword=comet
kn-keyword=comet
END
start-ver=1.4
cd-journal=joma
no-vol=304
cd-vols=
no-issue=
article-no=
start-page=109402
end-page=
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2020
dt-pub=202009
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Mineralogical alterations in calcite powder flooded with MgCl2 to study Enhanced Oil Recovery (EOR) mechanisms at pore scale
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Seawater injection into chalk-reservoirs on the Norwegian Continental Shelf has increased the oil recovery and reduced seabed subsidence, but not eliminated it. Therefore, understanding rock?fluid interactions is paramount to optimize water injection, predict and control water-induced compaction.
Laboratory experiments on onshore and reservoir chalks have shown the need to simplify the aqueous chemistry of the brine, and also the importance of studying the effect of primary mineralogy of chalk to understand which ions interact with the minerals present. In this study, the mineralogy of the samples tested, are simplified. These experiments are carried out on pure calcite powder (99.95%), compressed to cylinders, flooded with MgCl2, at 130?‹C and 0.5?MPa effective stress, for 27 and 289 days.
The tested material was analysed by scanning and transmission electron microscopy, along with whole-rock geochemistry. The results show dissolution of calcite followed by precipitation of magnesite. The occurrence and shape of new-grown crystals depend on flooding time and distance from the flooding inlet of the cylinder. Crystals vary in shape and size, from a few nanometres up to 2?ƒÊm after 27 days, and to over 10?ƒÊm after 289 days of flooding and may crystallize as a single grain or in clusters.
The population and distribution of new-grown minerals are found to be controlled by nucleation- and growth-rates along with advection of the injected fluid through the cores. Our findings are compared with in-house experiments on chalks, and allow for insight of where, when, and how crystals preferentially grow.
en-copyright=
kn-copyright=
en-aut-name=MindeMona W.
en-aut-sei=Minde
en-aut-mei=Mona W.
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=
en-aut-name=MadlandMerete V.
en-aut-sei=Madland
en-aut-mei=Merete V.
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=
en-aut-name=ZimmermannUdo
en-aut-sei=Zimmermann
en-aut-mei=Udo
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=
en-aut-name=EgelandNina
en-aut-sei=Egeland
en-aut-mei=Nina
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=
en-aut-name=KorsnesReidar I.
en-aut-sei=Korsnes
en-aut-mei=Reidar I.
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=5
ORCID=
en-aut-name=NakamuraEizo
en-aut-sei=Nakamura
en-aut-mei=Eizo
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=6
ORCID=
en-aut-name=KobayashiKatsura
en-aut-sei=Kobayashi
en-aut-mei=Katsura
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=7
ORCID=
en-aut-name=OtaTsutomu
en-aut-sei=Ota
en-aut-mei=Tsutomu
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=8
ORCID=
affil-num=1
en-affil=The National IOR Centre of Norway
kn-affil=
affil-num=2
en-affil=The National IOR Centre of Norway
kn-affil=
affil-num=3
en-affil=The National IOR Centre of Norway
kn-affil=
affil-num=4
en-affil=The National IOR Centre of Norway
kn-affil=
affil-num=5
en-affil=The National IOR Centre of Norway
kn-affil=
affil-num=6
en-affil=Institute for Planetary Materials, Okayama University
kn-affil=
affil-num=7
en-affil=Institute for Planetary Materials, Okayama University
kn-affil=
affil-num=8
en-affil=Institute for Planetary Materials, Okayama University
kn-affil=
en-keyword=Mineral replacement reactions
kn-keyword=Mineral replacement reactions
en-keyword=EOR
kn-keyword=EOR
en-keyword=Calcite
kn-keyword=Calcite
en-keyword=FE-SEM
kn-keyword=FE-SEM
en-keyword=FE-TEM
kn-keyword=FE-TEM
END
start-ver=1.4
cd-journal=joma
no-vol=
cd-vols=
no-issue=
article-no=
start-page=
end-page=
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2021
dt-pub=20210517
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Element concentrations of chondrule constituents, supplement to: Tak Kunihiro et al. (2021): The trace element composition of chondrule constituents: Implications for sample return methodologies and the chondrule silicate reservoir. Meteorit Planet Sci
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=
en-copyright=
kn-copyright=
en-aut-name=KunihiroTak
en-aut-sei=Kunihiro
en-aut-mei=Tak
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=
en-aut-name=OtaTsutomu
en-aut-sei=Ota
en-aut-mei=Tsutomu
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=
en-aut-name=YamanakaMasahiro
en-aut-sei=Yamanaka
en-aut-mei=Masahiro
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=
en-aut-name=NakamuraEizo
en-aut-sei=Nakamura
en-aut-mei=Eizo
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=
affil-num=1
en-affil=The Pheasant Memorial Laboratory, Institute for Planetary Materials, Okayama University
kn-affil=
affil-num=2
en-affil=The Pheasant Memorial Laboratory, Institute for Planetary Materials, Okayama University
kn-affil=
affil-num=3
en-affil=The Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Planetary Materials, Okayama University
kn-affil=
affil-num=4
en-affil=The Pheasant Memorial Laboratory, Institute for Planetary Materials, Okayama University
kn-affil=
END
start-ver=1.4
cd-journal=joma
no-vol=18
cd-vols=
no-issue=3
article-no=
start-page=1020
end-page=1029
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2022
dt-pub=20220422
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Lithium in garnet as a tracer of subduction zone metamorphic reactions: The record in ultrahigh-pressure metapelites at Lago di Cignana, Italy
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Lithium is of great interest as a tracer of metamorphic reactions and related fluid-mineral interactions because of its potential to isotopically fractionate during inter- and intracrystalline diffusional processes. Study of its transfer through subduction zones, based on study of arc volcanic and metamorphic rocks, can yield insight regarding ocean-to-mantle chemical cycling. We investigated major- and trace-element concentrations and delta Li-7 in garnet in ultrahigh-pressure (UHP) Lago di Cignana metasedimentary rocks, relating these observations to reconstructed prograde devolatilization history. In all garnet crystals we studied, heavy rare earth elements (HREEs), Y, and Li showed strong zoning, with elevated concentrations in cores (15-50 ppm Li) and marked high-concentration anomalies (up to 117 ppm Li, 5500 ppm Y; little or no major-element shift) as growth annuli, in which some crystals showed subtle elevation in delta Li-7 greater than analytical error of similar to 3 parts per thousand (2 sigma). Rutile inclusions appeared abruptly at annuli and outward toward rims, accompanied by inclusions of a highly zoned, Ca- and rare earth element-rich phase and decreased Nb concentrations in garnet. These relationships are interpreted to reflect prograde garnet-forming reaction(s), in part involving titanite breakdown to stabilize rutile, which resulted in delivery of more abundant Y and HREEs at surfaces of growing garnet crystals to produce annuli. Co-enrichments in Li and Y + REEs are attributed to mutual incorporation via charge-coupled substitutions; thus, increased Li uptake was a passive consequence of elevated concentrations of Y + REEs. The small-scale fluctuations in delta Li-7 (overall range of similar to 9 parts per thousand) observed in some crystals may correlate with abrupt shifts in major-and trace-element concentrations, suggesting that changes in reactant phases exerted some control on the evolution of delta Li-7. For one garnet crystal, late-stage growth following partial resorption produced deviation in major- and trace-element compositions, including Li concentration, accompanied by a 10 parts per thousand-15 parts per thousand negative shift in delta Li-7, perhaps reflecting a change in the mechanism of incorporation or source of Li. These results highlight the value of measuring the major- and trace-element and isotope compositions of garnets in high-pressure and UHP metamorphic rocks in which matrix mineral assemblages are extensively overprinted by recrystallization during exhumation histories. Lithium concentrations and isotope compositions of the garnets can add valuable information regarding prograde (and retrograde) reaction history, kinetics of porphyroblast growth, intracrystalline diffusion, and fluid-rock interactions. This work, integrated with previous study of devolatilization in the Schistes Lustres/Cignana metasedimentary suite, indicates retention of a large fraction of the initially subducted sedimentary Li budget to depths approaching those beneath volcanic fronts, despite the redistribution of this Li among mineral phases during complex mineral reaction histories.
en-copyright=
kn-copyright=
en-aut-name=BeboutGray E.
en-aut-sei=Bebout
en-aut-mei=Gray E.
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=
en-aut-name=OtaTsutomu
en-aut-sei=Ota
en-aut-mei=Tsutomu
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=
en-aut-name=KunihiroTakuya
en-aut-sei=Kunihiro
en-aut-mei=Takuya
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=
en-aut-name=CarlsonWilliam D.
en-aut-sei=Carlson
en-aut-mei=William D.
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=
en-aut-name=NakamuraEizo
en-aut-sei=Nakamura
en-aut-mei=Eizo
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=5
ORCID=
affil-num=1
en-affil=Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Planetary Materials, Okayama University
kn-affil=
affil-num=2
en-affil=Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Planetary Materials, Okayama University
kn-affil=
affil-num=3
en-affil=Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Planetary Materials, Okayama University
kn-affil=
affil-num=4
en-affil=Department of Geological Sciences, Jackson School of Geosciences, University of Texas at Austin
kn-affil=
affil-num=5
en-affil=Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Planetary Materials, Okayama University
kn-affil=
END