{"type": "FeatureCollection", "features": [{"id": "10.1016/j.chemgeo.2016.11.020", "type": "Feature", "geometry": null, "properties": {"license": "Open Access", "updated": "2026-05-31T06:56:41Z", "type": "Journal Article", "created": "2016-11-17", "title": "The gallium isotopic composition of the bulk silicate Earth", "description": "AbstractWe report a new method for precise analysis of gallium (Ga) isotopic composition in geological samples. The purification of Ga is achieved by a three-step ion exchange chromatography to remove matrix and interfering elements. The 71Ga/69Ga ratios are analyzed by multi-collector inductively-coupled-plasma mass-spectrometer (MC-ICP-MS). The external reproducibility of the measurements (0.05\u2030, 2 s.d.) was assessed by replicate analyses of the USGS BCR-2 and BHVO-2 standards. This newly developed technique was then used to investigate the extent of Ga isotopic fractionation during igneous processes by analyzing well-characterized samples from the Kilauea Iki lava lake, USA. These samples were formed in a closed system and have MgO contents ranging from 26.9 to 2.4wt.%. We found that igneous processes do not fractionate Ga isotopes within the analytical uncertainty and that the Ga isotopic composition of mafic-ultramafic lavas can be used to estimate the composition of their mantle source. Twelve ocean island basalts, two mid-ocean-ridge basalts, one continental flood basalt and one komatiite have homogeneous and nearly identical Ga isotopic compositions within analytical uncertainties averaging 0.00\u00b10.06\u2030 (2s.d.). This value represents the best estimate for the Ga isotopic composition of the bulk silicate Earth", "keywords": ["Bulk Silicate Earth", "Komatiite", "Gallium", "Geology", "MORB", "01 natural sciences", "[SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry", "Geochemistry and Petrology", "13. Climate action", "[SDU.STU.GC] Sciences of the Universe [physics]/Earth Sciences/Geochemistry", "14. Life underwater", "OIB", "MC-ICP-MS", "Basalt", "0105 earth and related environmental sciences"]}, "links": [{"href": "https://doi.org/10.1016/j.chemgeo.2016.11.020"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Chemical%20Geology", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.chemgeo.2016.11.020", "name": "item", "description": "10.1016/j.chemgeo.2016.11.020", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.chemgeo.2016.11.020"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2017-01-01T00:00:00Z"}}, {"id": "10.1016/j.chemgeo.2017.12.006", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-31T06:56:41Z", "type": "Journal Article", "created": "2017-12-13", "title": "Zinc isotope composition of the Earth and its behaviour during planetary accretion", "description": "Abstract   The terrestrial planets are depleted in volatile elements with respect to chondritic meteorites, their possible building blocks. However, the timing, extent and origin of volatile depletion is debated. Zinc is a moderately volatile element (MVE), whose stable isotopic composition can distinguish when and where this depletion took place. Here, we report data for 40 ultramafic rocks comprising pristine upper mantle peridotites from the Balmuccia orogenic lherzolite massif and Archean komatiites that together define the Zn isotope composition of the Earth's primitive mantle. Peridotites and komatiites are shown to have indistinguishable Zn isotopic compositions of \u03b466Zn\u00a0=\u00a0+\u00a00.16\u00a0\u00b1\u00a00.06\u2030 (2SD), (with \u03b466Zn the per mille deviation of 66Zn/64Zn from the JMC-Lyon standard), implying a constant Zn isotope composition for the silicate Earth since 3.5\u00a0Ga. After accounting for Zn sequestration during core formation, the Earth falls on the volatile-depleted end of a carbonaceous chondrite array in \u03b466Zn-Zn/Mg space, implying Earth avoided modification of its MVE budgets during late accretion (e.g. during a giant impact), in contrast to the Moon. The Moon deviates from the chondritic array in a manner consistent with evaporative loss of Zn, where its \u03b466Zn co-varies with Mn/Na, implying post-nebular volatile loss is more pronounced on smaller bodies. Should the giant impact deliver the Earth's volatile complement of Pb and Ag, it cannot account for the budget of lithophile MVEs (e.g. Zn, Rb, Mn), whose abundances reflect those of Earth's nebular building blocks. The Earth initially accreted from material that experienced chemical- and mass-dependent isotopic fractionation akin to carbonaceous chondrites, though volatile depletion was more pronounced on Earth.", "keywords": ["Zinc", "550", "Isotope", "13. Climate action", "Nebula", "[SDU.STU.GC] Sciences of the Universe [physics]/Earth Sciences/Geochemistry", "Komatiite", "Mantle", "[SDU.STU.PL] Sciences of the Universe [physics]/Earth Sciences/Planetology", "Peridotite", "01 natural sciences", "0105 earth and related environmental sciences"]}, "links": [{"href": "https://openresearch-repository.anu.edu.au/bitstream/1885/139076/4/1-s2.0-S0009254117306782-main.pdf.jpg"}, {"href": "https://doi.org/10.1016/j.chemgeo.2017.12.006"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Chemical%20Geology", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.chemgeo.2017.12.006", "name": "item", "description": "10.1016/j.chemgeo.2017.12.006", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.chemgeo.2017.12.006"}, {"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": "10.1016/j.chemgeo.2018.03.030", "type": "Feature", "geometry": null, "properties": {"license": "Open Access", "updated": "2026-05-31T06:56:41Z", "type": "Journal Article", "created": "2018-03-20", "title": "The stable strontium isotopic composition of ocean island basalts, mid-ocean ridge basalts, and komatiites", "description": "Ocean island basalts Mid-ocean ridge basalts Komatiites Kilauea Iki Bulk silicate earth A B S T R A C T The radiogenic 87 Rb-87 Sr system has been widely applied to the study of geological and planetary processes. In contrast, the stable Sr isotopic composition of the bulk silicate Earth (BSE) and the effects of igneous differentiation on stable Sr isotopes are not well-established. Here we report the stable Sr isotope (88 Sr/ 86 Sr, reported as \u03b4 88/86 Sr, in parts per mil relative to NIST SRM 987) compositions for ocean islands basalts (OIB), mid-ocean ridge basalts (MORB) and komatiites from a variety of locations. Stable Sr isotopes display limited fractionation in a OIB sample suite from the Kilauea Iki lava lake suggesting that igneous processes have limited effect on stable Sr isotope fractionation (\u00b1 0.12\u2030 over 20% MgO variation; 2sd). In addition, OIB (\u03b4 88/ 86 Sr = 0.16-0.46\u2030; average 0.28 \u00b1 0.17\u2030), MORB (\u03b4 88/86 Sr = 0.27-0.34\u2030; average 0.31 \u00b1 0.05\u2030) and komatiites (\u03b4 88/86 Sr = 0.20-0.97\u2030; average 0.41 \u00b1 0.16\u2030) from global localities exhibit broadly similar Sr stable isotopic compositions. Heavy stable Sr isotope compositions (\u03b4 88/86 Sr > 0.5\u2030) in some Barberton Greenstone belt komatiites may reflect Archean seawater alteration or metamorphic processes and preferential removal of the lighter isotopes of Sr. To first order, the similarity among OIBs from three different ocean basins suggests homogeneity of stable Sr isotopes in the mantle. Earth's mantle stable Sr isotopic composition is established from the data on OIB, MORB and komatiites to be \u03b4 88/86 Sr = 0.30 \u00b1 0.02\u2030 (2sd). The BSE \u03b4 88/86 Sr value is identical, within uncertainties, to the composition of carbonaceous chondrites (\u03b4 88/ 86 Sr = 0.29 \u00b1 0.06\u2030; 2sd) measured in this study.", "keywords": ["Ocean island basalts", "Bulk silicate earth", "Sr isotopes", "Mid-ocean ridge basalts", "Kilauea Iki", "13. Climate action", "[SDU.STU.GC] Sciences of the Universe [physics]/Earth Sciences/Geochemistry", "14. Life underwater", "Komatiites", "01 natural sciences", "0105 earth and related environmental sciences"]}, "links": [{"href": "https://doi.org/10.1016/j.chemgeo.2018.03.030"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Chemical%20Geology", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.chemgeo.2018.03.030", "name": "item", "description": "10.1016/j.chemgeo.2018.03.030", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.chemgeo.2018.03.030"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2018-04-01T00:00:00Z"}}], "links": [{"rel": "self", "type": "application/geo+json", "title": "This document as GeoJSON", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=Komatiite&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=Komatiite&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=Komatiite&", "hreflang": "en-US"}, {"rel": "last", "type": "application/geo+json", "title": "items (last)", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=Komatiite&offset=3", "hreflang": "en-US"}], "numberMatched": 3, "numberReturned": 3, "distributedFeatures": [], "timeStamp": "2026-05-31T08:54:48.130089Z"}