{"type": "FeatureCollection", "features": [{"id": "10.1016/j.gca.2019.07.043", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-31T06:57:10Z", "type": "Journal Article", "created": "2019-08-01", "title": "Tracking the volatile and magmatic history of Vesta from chromium stable isotope variations in eucrite and diogenite meteorites", "description": "Abstract   Although Solar System bodies exhibit large variations in their volatile element abundances, the mechanisms and conditions that lead to these variations remain ambiguous. The howardite-eucrite-diogenite (HED) meteorites that likely sample the asteroid 4 Vesta, provide evidence for extensive volatile depletion on their parent body. Isotopic variations in moderately volatile elements, such as Zn, have been used to track the origin of such volatile loss. Although not nominally volatile, Cr is useful because it has several oxidized gas species that render it volatile under the oxidizing conditions that characterize planetary accretion. As such, volatile loss of Cr has the potential to produce an isotopically light evaporation residue under an equilibrium regime. This contrasts with other moderately volatile elements that show heavy isotope enrichments in the residue following both kinetic or equilibrium fractionation. Here, we report the Cr stable isotope composition of 11 eucrites and four diogenites. The eucrites possess systematically lighter Cr isotope compositions than diogenites, which is onset by the accumulation of isotopically heavy Cr3+-rich orthopyroxene and spinel in diogenites during their magmatic evolution. We estimate for the primary eucrite melt with Mg# \u2248 50, a \u03b453Cr (53Cr/52Cr deviation relative to NIST SRM 979 in per mile) of \u22120.22\u202f\u00b1\u202f0.03\u2030 (2SD), lighter than any chondritic meteorite group by \u223c0.1\u2030. This deficit may result from either partial melting with residual Cr3+-bearing phases (e.g. chromite) that retain heavy isotopes, or from vapor loss that occurred at equilibrium with a magma ocean on Vesta. Isotopic fractionation during partial melting would necessitate implausibly high Cr contents in the Vestan mantle, and oxygen fugacities high enough to stabilize chromite in the mantle source. Isotopic fractionation during evaporation would require an oxidized vapor and a reduced residue, as predicted by thermodynamic constraints on the composition of the vapor phase above a silicate magma ocean. Therefore, this Cr isotopic deficit between Vesta and chondrites may be caused by Cr loss at relatively high oxygen fugacity in a gas phase at equilibrium with the liquid from which it evolved. Temperatures of volatile loss are estimated to be lower than 2300\u202fK, consistent with loss from a large-scale magma ocean model for formation of Vesta, which may be a common evolutionary stage in accreting planetesimals.", "keywords": ["Magma ocean", "550", "Volatile history", "500", "Volatile elements", "[SDU.ASTR] Sciences of the Universe [physics]/Astrophysics [astro-ph]", "7. Clean energy", "01 natural sciences", "[SDU] Sciences of the Universe [physics]", "Vesta", "Howardite-eucrite-diogenite", "13. Climate action", "Chondrites", "Cr isotopes", "Equilibrium fractionation", "0105 earth and related environmental sciences"]}, "links": [{"href": "https://doi.org/10.1016/j.gca.2019.07.043"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Geochimica%20et%20Cosmochimica%20Acta", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.gca.2019.07.043", "name": "item", "description": "10.1016/j.gca.2019.07.043", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.gca.2019.07.043"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2019-12-01T00:00:00Z"}}, {"id": "10.1016/j.epsl.2017.04.029", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-31T06:56:57Z", "type": "Journal Article", "created": "2017-05-20", "title": "Chemical and isotopic kinship of iron in the Earth and Moon deduced from the lunar Mg-Suite", "description": "Abstract   The Moon and the Earth's mantle share many chemical and isotopic traits, leading to the prevailing theory that they were formed from similar material. Iron is one element that shows apparent differences between the two bodies, with models for the composition of the Moon having \u22481.5 times more FeO (12\u201314 wt.%), relative to the Earth's mantle (8 wt.%). This difference is mirrored in their isotope compositions, where lunar mare basalts have \u03b457Fe (per mille deviation of the 57Fe/54Fe ratio from the IRMM-014 standard) 0.1\u20130.2\u2030 higher than peridotitic rocks representative of Earth's mantle, a feature initially attributed to loss of isotopically light Fe following a giant impact. However, whether basaltic rocks are suitable analogues for the Moon's composition is debatable in the light of their distinct source regions that reflect the extensive lithological stratification of the lunar mantle. Here, we evaluate the iron isotope composition of the bulk Moon through the study of igneous cumulate rocks of the lunar highlands Magnesium Suite (Mg Suite). The \u03b457Fe of Mg Suite rocks spans a limited range, from 0.05\u2030 to 0.10\u2030, with an average (   +  0.07  \u00b1  0.02  \u2030   ) that overlaps with Earth's mantle (   +  0.05  \u00b1  0.01  \u2030   ), similarities that extend to their Mg#s, where both reach 0.9. Numerical modelling of iron isotope fractionation during lunar magma ocean crystallisation shows that the Mg Suite should accurately reflect the composition of the bulk Moon, which is therefore    +  0.07  \u00b1  0.02  \u2030   , indistinguishable from Earth's mantle but heavier than chondrites (   \u2212  0.01  \u00b1  0.01  \u2030   ). Iron thus behaves coherently with other elements that condense at temperatures higher than Li in showing no isotopic difference between the Earth and Moon, suggesting element depletion on the Moon affected only the more volatile elements. Therefore, there is no cosmochemical basis for iron enrichment or depletion in the bulk Moon relative to the Earth's mantle, whose composition is an analogue for that of the Moon.", "keywords": ["[SDU] Sciences of the Universe [physics]", "iron", "13. Climate action", "Magma Ocean", "Mg Suite", "isotope", "Moon", "Earth mantle", "01 natural sciences", "7. Clean energy", "0105 earth and related environmental sciences"]}, "links": [{"href": "https://doi.org/10.1016/j.epsl.2017.04.029"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Earth%20and%20Planetary%20Science%20Letters", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.epsl.2017.04.029", "name": "item", "description": "10.1016/j.epsl.2017.04.029", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.epsl.2017.04.029"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2017-08-01T00:00:00Z"}}, {"id": "10.1016/j.icarus.2017.09.002", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-31T06:57:17Z", "type": "Journal Article", "created": "2017-09-12", "title": "Volatile element loss during planetary magma ocean phases", "description": "Abstract   Moderately volatile elements (MVE) are key tracers of volatile depletion in planetary bodies. Zinc is an especially useful MVE because of its generally elevated abundances in planetary basalts, relative to other MVE, and limited evidence for mass-dependent isotopic fractionation under high-temperature igneous processes. Compared with terrestrial basalts, which have  \u03b4  66 Zn values (per mille deviation of the  66 Zn/ 64 Zn ratio from the JMC-Lyon standard) similar to some chondrite meteorites (\u223c+0.3\u2030), lunar mare basalts yield a mean  \u03b4  66 Zn value of +1.4\u00a0\u00b1\u00a00.5\u2030 (2\u00a0st. dev.). Furthermore, mare basalts have average Zn concentrations \u223c50 times lower than in typical terrestrial basaltic rocks. Late-stage lunar magmatic products, including ferroan anorthosite, Mg- and Alkali-suite rocks have even higher  \u03b4  66 Zn values (+3 to +6\u2030). Differences in Zn abundance and isotopic compositions between lunar and terrestrial rocks have previously been interpreted to reflect evaporative loss of Zn, either during the Earth\u2013Moon forming Giant Impact, or in a lunar magma ocean (LMO) phase. To explore the mechanisms and processes under which volatile element loss may have occurred during a LMO phase, we developed models of Zn isotopic fractionation that are generally applicable to planetary magma oceans. Our objective was to identify conditions that would yield a  \u03b4  66 Zn signature of \u223c+1.4\u2030 within the lunar mantle. For the sake of simplicity, we neglect possible Zn isotopic fractionation during the Giant Impact, and assumed a starting composition equal to the composition of the present-day terrestrial mantle, assuming both the Earth and Moon had zinc \u2018consanguinity\u2019 following their formation. We developed two models: the first simulates evaporative fractionation of Zn only prior to LMO mixing and crystallization; the second simulates continued evaporative fractionation of Zn that persists until \u223c75% LMO crystallization. The first model yields a relatively homogenous bulk solid LMO  \u03b4  66 Zn value, while the second results in a stratification of  \u03b4  66 Zn values within the LMO sequence. Loss and/or isolation mechanisms for volatiles are critical to these models; hydrodynamic escape was not a dominant process, but loss of a nascent lunar atmosphere or separation of condensates into a proto-lunar crust are possible mechanisms by which volatiles could be separated from the lunar interior. The results do not preclude models that suggest a lunar volatile depletion episode related to the Giant Impact. Conversely, LMO models for volatile loss do not require loss of volatiles prior to lunar formation. Outgassing during planetary magma ocean phases likely played a profound role in setting the volatile inventories of planets, particularly for low mass bodies that experienced the greatest volatile loss. In turn, our results suggest that the initial compositions of planets that accreted from smaller, highly differentiated planetesimals were likely to be severely volatile depleted.", "keywords": ["[SDU] Sciences of the Universe [physics]", "Zinc", "Magma ocean", "Isotopes", "Volatile depletion", "13. Climate action", "Abundances", "Moon", "01 natural sciences", "0105 earth and related environmental sciences"]}, "links": [{"href": "https://doi.org/10.1016/j.icarus.2017.09.002"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Icarus", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.icarus.2017.09.002", "name": "item", "description": "10.1016/j.icarus.2017.09.002", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.icarus.2017.09.002"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2018-01-01T00:00:00Z"}}, {"id": "10.1073/pnas.1708236114", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-31T06:58:51Z", "type": "Journal Article", "created": "2017-08-22", "title": "Late-stage magmatic outgassing from a volatile-depleted Moon", "description": "Significance<p>The \uffe2\uff80\uff9cRusty Rock\uffe2\uff80\uff9d 66095 is one of the most volatile-rich rocks from the Moon. The abundance and isotopic composition of volatile elements in the Rusty Rock demonstrates that its lunar interior source became highly depleted in volatile elements and compounds, including Zn, Cl, and Pb. Depletion of these and other volatile elements occurred during thermomagmatic evolution of the Moon and a magma ocean phase. The volatile-rich nature of some rocks on the lunar surface likely originates from extreme degassing and volatile loss from the Moon\uffe2\uff80\uff99s interior. Light zinc isotopic compositions in the Rusty Rock and in the lunar volcanic glass beads (74220, 15426) imply that these samples are partly derived from reservoirs that experienced vapor condensation from a volatile-poor Moon.</p>", "keywords": ["13. Climate action", "condensates", "magma ocean", "volatile-poor", "[SDU.STU.PL] Sciences of the Universe [physics]/Earth Sciences/Planetology", "Moon", "01 natural sciences", "Rusty Rock", "0105 earth and related environmental sciences"]}, "links": [{"href": "https://pnas.org/doi/pdf/10.1073/pnas.1708236114"}, {"href": "https://doi.org/10.1073/pnas.1708236114"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Proceedings%20of%20the%20National%20Academy%20of%20Sciences", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1073/pnas.1708236114", "name": "item", "description": "10.1073/pnas.1708236114", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1073/pnas.1708236114"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2017-08-21T00:00:00Z"}}, {"id": "10.1126/sciadv.1700571", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-31T06:59:56Z", "type": "Journal Article", "created": "2017-07-29", "title": "Gallium isotopic evidence for extensive volatile loss from the Moon during its formation", "description": "<p>The Moon is depleted in volatile elements compared to Earth. Gallium isotopes indicate a global-scale evaporation event.</p>", "keywords": ["Earth and Planetary Astrophysics (astro-ph.EP)", "2. Zero hunger", "GIANT IMPACT", "FOS: Physical sciences", "MANTLE", "01 natural sciences", "LUNAR-SAMPLES", "[SDU] Sciences of the Universe [physics]", "ZINC", "ABUNDANCES", "DIFFERENTIATION", "ROCKS", "13. Climate action", "IMPACT ORIGIN", "EARTH", "Research Articles", "MAGMA OCEAN", "Astrophysics - Earth and Planetary Astrophysics", "0105 earth and related environmental sciences"]}, "links": [{"href": "https://doi.org/10.1126/sciadv.1700571"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Science%20Advances", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1126/sciadv.1700571", "name": "item", "description": "10.1126/sciadv.1700571", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1126/sciadv.1700571"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2017-07-07T00:00:00Z"}}], "links": [{"rel": "self", "type": "application/geo+json", "title": "This document as GeoJSON", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=Magma+Ocean&f=json", "hreflang": "en-US"}, {"rel": "alternate", "type": "text/html", "title": "This document as HTML", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=Magma+Ocean&f=html", "hreflang": "en-US"}, {"rel": "collection", "type": "application/json", "title": "Collection URL", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main", "hreflang": "en-US"}, {"type": "application/geo+json", "rel": "first", "title": "items (first)", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=Magma+Ocean&", "hreflang": "en-US"}, {"rel": "last", "type": "application/geo+json", "title": "items (last)", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=Magma+Ocean&offset=5", "hreflang": "en-US"}], "numberMatched": 5, "numberReturned": 5, "distributedFeatures": [], "timeStamp": "2026-05-31T11:58:54.667059Z"}