Petrogenesis of the Dar al Gani (DaG) 1.1 Ma ejection-paired olivine-phyric shergottites and implications for 470 Ma Martian volcanism

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dc.citation.firstpage1654en_US
dc.citation.issueNumber11en_US
dc.citation.journalTitleMeteoritics & Planetary Scienceen_US
dc.citation.lastpage1676en_US
dc.citation.volumeNumber58en_US
dc.contributor.authorAucamp, Tarrynen_US
dc.contributor.authorHowarth, Geoffrey H.en_US
dc.contributor.authorPeel, Chad J.en_US
dc.contributor.authorCostin, Geluen_US
dc.contributor.authorDay, James M. D.en_US
dc.contributor.authorle Roux, Petrusen_US
dc.contributor.authorScott, James M.en_US
dc.contributor.authorGreshake, Ansgaren_US
dc.contributor.authorBartoschewitz, Raineren_US
dc.date.accessioned2024-05-03T15:51:02Zen_US
dc.date.available2024-05-03T15:51:02Zen_US
dc.date.issued2023en_US
dc.description.abstractThe Dar al Gani (DaG) olivine-phyric shergottites share mineralogical and geochemical characteristics, which confirm that these meteorites are derived from a single source. Bulk trace elements (La/Yb—0.12), in situ maskelynite 87Sr/86Sr ( 0.7014) and redox estimates (FMQ −2) indicate derivation from a depleted, reduced mantle reservoir; identical to all 470 Ma shergottites ejected at 1.1 Ma. The DaG shergottites have been variably affected by terrestrial alteration, which precipitated carbonate along fractures and modified bulk-rock fluid mobile (e.g., Ba) elements. Nonetheless, sufficient data are available to construct a multi-stage formation model for the DaG shergottites and other 1.1 Ma ejection-paired shergottites that erupted at 470 Ma. First, partial melting of a depleted mantle source occurred at 1540 ± 20°C and 1.2 ± 0.1 GPa, equivalent to > 100 km depth. Then, initial crystallization in a staging chamber at 85 km depth at the crust–mantle boundary took place, followed by magma evolution and variable incorporation of antecrystic olivine ± orthopyroxene. Subsequently, crystallization of olivine phenocrysts and re-equilibration of olivine antecrysts occurred within an ascending magma. Finally, magmas with variable crystal loads erupted at the surface, where varied cooling rates produced a range of groundmass textures. This model is similar to picritic flood basalt magmas erupted on Earth.en_US
dc.identifier.citationAucamp, T., Howarth, G. H., Peel, C. J., Costin, G., Day, J. M. D., le Roux, P., Scott, J. M., Greshake, A., & Bartoschewitz, R. (2023). Petrogenesis of the Dar al Gani (DaG) 1.1 Ma ejection-paired olivine-phyric shergottites and implications for 470 Ma Martian volcanism. Meteoritics & Planetary Science, 58(11), 1654–1676. https://doi.org/10.1111/maps.14090en_US
dc.identifier.digitalPetrogenesis-of-the-Dar-al-Ganien_US
dc.identifier.doihttps://doi.org/10.1111/maps.14090en_US
dc.identifier.urihttps://hdl.handle.net/1911/115516en_US
dc.language.isoengen_US
dc.publisherWileyen_US
dc.rightsExcept where otherwise noted, this work is licensed under a Creative Commons Attribution-NonCommercial (CC BY-NC) license. Permission to reuse, publish, or reproduce the work beyond the terms of the license or beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.rights.urihttps://creativecommons.org/licenses/by-nc/4.0/en_US
dc.titlePetrogenesis of the Dar al Gani (DaG) 1.1 Ma ejection-paired olivine-phyric shergottites and implications for 470 Ma Martian volcanismen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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