Origin of chondritic forsterite grains

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dc.contributor.authorPack, Andreas
dc.contributor.authorPalme, Herbert
dc.contributor.authorShelley, Michael
dc.date.accessioned2015-12-13T23:02:00Z
dc.date.issued2005
dc.date.updated2015-12-12T07:44:16Z
dc.description.abstractIron-poor and refractory lithophile element (RLE) rich forsterite grains occur in all major types of unequilibrated chondrites. In our laser ablation inductively coupled mass spectrometry (LA-ICPMS) minor and trace element study we show that refractory forsterites (RF) from carbonaceous (CC), unequilibrated ordinary (UOC) and a Rumuruti chondrite (RC) have similar chemical compositions with high RLE concentrations and low concentrations of Mn, Fe, Co and Ni. Fractionation of RLEs and rare earth elements (REEs) is in agreement with formation by crystallization from a RLE rich silicate melt. Low concentrations and the fractionation of moderately siderophile elements (Fe, Co, Ni) in RFs suggests formation at low oxygen fugacity, possibly in equilibrium with primitive Fe,Ni metal condensates in a gas of solar composition. Anomalously high Ti in the parental melt can be explained by Ti3+/Ti4+ ∼1.5, supporting formation of RF in highly reducing conditions. Low Mn concentrations indicate formation at high temperatures (<∼1160 K). The model of formation of RFs and the accompanying physico-chemical conditions during their formation as well as their relation to non refractory olivine are discussed.
dc.identifier.issn1872-9533
dc.identifier.urihttp://hdl.handle.net/1885/84689
dc.publisherPergamon-Elsevier Ltd
dc.sourceGeochimica et Cosmochimica Acta
dc.subjectKeywords: chondrite; forsterite; meteorite
dc.titleOrigin of chondritic forsterite grains
dc.typeJournal article
local.bibliographicCitation.issue12
local.bibliographicCitation.lastpage82
local.bibliographicCitation.startpage3159
local.contributor.affiliationPack, Andreas, CNRS centre de Recherche Petrographiques et Geochimiques
local.contributor.affiliationPalme, Herbert, University of Cologne
local.contributor.affiliationShelley, Michael, College of Physical and Mathematical Sciences, ANU
local.contributor.authoremailrepository.admin@anu.edu.au
local.contributor.authoruidShelley, Michael, u7600430
local.description.embargo2037-12-31
local.description.notesImported from ARIES
local.description.refereedYes
local.identifier.absfor040303 - Geochronology
local.identifier.ariespublicationMigratedxPub12953
local.identifier.citationvolume69
local.identifier.doi10.1016/j.gca.2005.01.013
local.identifier.scopusID2-s2.0-20844432015
local.identifier.uidSubmittedByMigrated
local.type.statusPublished Version

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