Show simple item record

dc.contributor.authorPratesi, Giovanni
dc.contributor.authorMorelli, Marco
dc.contributor.authorRossi, Angelo Pio
dc.contributor.authorOri, Gian Gabriele
dc.date.accessioned2021-02-12T21:17:56Z
dc.date.available2021-02-12T21:17:56Z
dc.date.issued2005-01-01
dc.identifier.citationPratesi, G., Morelli, M., Rossi, A. P., & Ori, G. G. (2005). Chemical compositions of impact melt breccias and target rocks from the Tenoumer impact crater, Mauritania. Meteoritics & Planetary Science, 40(11), 1653-1672.
dc.identifier.issn1945-5100
dc.identifier.doi10.1111/j.1945-5100.2005.tb00137.x
dc.identifier.urihttp://hdl.handle.net/10150/656067
dc.description.abstractThe impact melt breccias from the Tenoumer crater (consisting of a fine-grained intergrowth of plagioclase laths, pyroxene crystals, oxides, and glass) display a wide range of porosity and contain a large amount of target rock clasts.Analyses of major elements in impact melt rocks show lower contents of SiO2, Al2O3, and Na2O, and higher contents of MgO, Fe2O3, and CaO, than the felsic rocks (i.e., granites and gneisses) of the basement. In comparison with the bulk analyses of the impact melt, the glass is strongly enriched in Si-Al, whereas it is depleted both in Mg and Fe; moreover, the impact melt rocks are variably enriched or depleted in some REE with respect to the felsic and mafic bedrock types. Gold is slightly enriched in the impact melt, and Co, Cr, and Ni abundances are possibly due to a contribution from mafic bedrock.Evidences of silicate-carbonate liquid immiscibility, mainly as spherules and globules of calcite within the silicate glass, have been highlighted.HMX mixing calculation confirm that the impact melt rocks are derived from a mixing of at least six different target lithologies outcropping in the area of the crater. A large contribution is derived from granitoids (~50%) and mica schist (17-19%), although amphibolites (~15%), cherty limestones (~10%), and ultrabasites (~6%) components are also present. The very low abundances of PGE in the melt rock seem to come mainly from some ultrabasic target rocks; therefore, the contamination from the meteoritic projectile appears to have been negligible.
dc.language.isoen
dc.publisherThe Meteoritical Society
dc.relation.urlhttps://meteoritical.org/
dc.rightsCopyright © The Meteoritical Society
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.subjectimpact craters
dc.subjectgeochemistry
dc.subjectimpact breccias
dc.titleChemical compositions of impact melt breccias and target rocks from the Tenoumer impact crater, Mauritania
dc.typeArticle
dc.typetext
dc.identifier.journalMeteoritics & Planetary Science
dc.description.collectioninformationThe Meteoritics & Planetary Science archives are made available by the Meteoritical Society and the University of Arizona Libraries. Contact lbry-journals@email.arizona.edu for further information.
dc.eprint.versionFinal published version
dc.description.admin-noteMigrated from OJS platform February 2021
dc.source.volume40
dc.source.issue11
dc.source.beginpage1653
dc.source.endpage1672
refterms.dateFOA2021-02-12T21:17:56Z


Files in this item

Thumbnail
Name:
15200-17553-1-PB.pdf
Size:
853.1Kb
Format:
PDF

This item appears in the following Collection(s)

Show simple item record