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Parent body histories recorded in Rumuruti chondrite sulfides: Implications for the onset of oxidized, sulfur-rich core formation

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dc.contributor.author Crossley, Samuel D.
dc.contributor.author Ash, Richard D.
dc.contributor.author Sunshine, Jessica M.
dc.contributor.author Corrigan, Catherine M.
dc.contributor.author McCoy, Timothy J.
dc.date.accessioned 2023-04-04T21:36:15Z
dc.date.available 2023-04-04T21:36:15Z
dc.date.issued 2023-02-27
dc.identifier.other DOI: 10.1111/maps.13959
dc.identifier.uri https://hdl.handle.net/20.500.11753/1848
dc.description.abstract Models of planetary core formation beginning with melting of Fe,Ni metal and troilite are not readily applicable to oxidized and sulfur-rich chondrites containing only trace quantities of metal. Cores formed in these bodies must be dominated by sulfides. Siderophile trace elements used to model metallic core formation could be used to model oxidized, sulfide-dominated core formation and identify related meteorites if their trace element systematics can be quantified. Insufficient information exists regarding the behavior of these core-forming elements among sulfides during metamorphism prior to anatexis. Major, minor, and trace element concentrations of sulfides are reported in this study for petrologic type 3–6 R chondrite materials. Sulfide-dominated core-forming components in such oxidized chondrites (ƒO2 ≥ iron-wüstite) follow metamorphic evolutionary pathways that are distinct from reduced, metal-bearing counterparts. Most siderophile trace elements partition into pentlandite at approximately 10× chondritic abundances, but Pt, W, Mo, Ga, and Ge are depleted by 1–2 orders of magnitude relative to siderophile elements with similar volatilities. The distribution of siderophile elements is further altered during hydrothermal alteration as pyrrhotite oxidizes to form magnetite. Oxidized, sulfide-dominated core formation differs from metallic core formation models both physically and geochemically. Incongruent melting of pentlandite at 865°C generates melts capable of migrating along solid silicate grains, which can segregate to form a Ni,S-rich core at lower temperatures compared to reduced differentiated parent bodies and with distinct siderophile interelement proportions. en
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher Meteoritics & Planetary Science en
dc.relation.ispartofseries LPI contribution ; no. 2885
dc.subject Chondrites (Meteorites) en
dc.title Parent body histories recorded in Rumuruti chondrite sulfides: Implications for the onset of oxidized, sulfur-rich core formation en
dc.type Article en
dc.rights.license This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License


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