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.firstpage1654
dc.citation.issueNumber11
dc.citation.journalTitleMeteoritics & Planetary Science
dc.citation.lastpage1676
dc.citation.volumeNumber58
dc.contributor.authorAucamp, Tarryn
dc.contributor.authorHowarth, Geoffrey H.
dc.contributor.authorPeel, Chad J.
dc.contributor.authorCostin, Gelu
dc.contributor.authorDay, James M. D.
dc.contributor.authorle Roux, Petrus
dc.contributor.authorScott, James M.
dc.contributor.authorGreshake, Ansgar
dc.contributor.authorBartoschewitz, Rainer
dc.date.accessioned2024-05-03T15:51:02Z
dc.date.available2024-05-03T15:51:02Z
dc.date.issued2023
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.
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.14090
dc.identifier.digitalPetrogenesis-of-the-Dar-al-Gani
dc.identifier.doihttps://doi.org/10.1111/maps.14090
dc.identifier.urihttps://hdl.handle.net/1911/115516
dc.language.isoeng
dc.publisherWiley
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.
dc.rights.urihttps://creativecommons.org/licenses/by-nc/4.0/
dc.titlePetrogenesis of the Dar al Gani (DaG) 1.1 Ma ejection-paired olivine-phyric shergottites and implications for 470 Ma Martian volcanism
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpublisher version
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