{"type": "FeatureCollection", "features": [{"id": "10.1016/j.chemgeo.2018.03.030", "type": "Feature", "geometry": null, "properties": {"license": "Open Access", "updated": "2026-07-28T16:16:03Z", "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"}}, {"id": "10.1016/j.gca.2016.06.008", "type": "Feature", "geometry": null, "properties": {"updated": "2026-07-28T16:16:29Z", "type": "Journal Article", "created": "2016-06-20", "title": "Silicon isotopes reveal recycled altered oceanic crust in the mantle sources of Ocean Island Basalts", "description": "Open Access23 pages, 5 figures, 2 tables", "keywords": ["Ocean Island Basalts", "Earth and Planetary Astrophysics (astro-ph.EP)", "GE", "550", "NDAS", "500", "Silicon isotopes", "FOS: Physical sciences", "7. 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