Matches in SemOpenAlex for { <https://semopenalex.org/work/W1986207788> ?p ?o ?g. }
Showing items 1 to 46 of
46
with 100 items per page.
- W1986207788 endingPage "3" @default.
- W1986207788 startingPage "1" @default.
- W1986207788 abstract "The origin of silicate-bearing irons, especially those in groups IAB, IIICD, and IIE, is poorly understood as silicate should have separated rapidly from molten metal. Here we report the results of high precision oxygen isotope analysis of silicate inclusions in eleven group IIE meteorites and a petrological study of silicate inclusions in ten IIE irons including those in Garhi Yasin and Tarahumara, which have not been described in detail before. Oxygen isotopes have also been analysed in 20 H chondrites to investigate their possible relationship with the IIE irons.Based on petrographic observations and mineral analysis, the silicate-bearing IIE meteorites have been divided into four types according to the nature of their silicate inclusions: (1) primitive chondritic, (2) evolved chondritic, (3) differentiated with >10 vol.% orthopyroxene, and (4) differentiated with <10 vol.% orthopyroxene. Each meteorite contains a single inclusion type. While inclusions in an individual IIE meteorite tend to show relatively limited Δ17O variation, a wide range of values is seen in the dataset as a whole. Group IIE irons with differentiated silicates, with the exception of Colomera, have a range of mean Δ17O values that is essentially identical to those of the H4-6 chondrites: 0.60–0.77‰ and 0.61–0.76‰, respectively. Colomera inclusions, which are differentiated with <10 vol.% orthopyroxene, have an anomalously high Δ17O value and plot ∼2σ away from the next nearest IIE iron. However, in view of the textural similarities to other IIE inclusions, a separate source for Colomera is deemed unlikely. Three IIE irons with primitive chondritic inclusions, Garhi Yasin, Netschaëvo, and Techado, have relatively low mean Δ17O values of 0.56–0.57‰ as well as relatively reduced silicates with Fa15–17 olivine, which have been called HH chondrites. Given the significant overlap in their oxygen isotope compositions, a genetic relationship between IIE irons and H chondrites is supported by our new data. However, derivation of both groups from one parent body seems unlikely. Instead, both groups probably sampled similar precursor materials and accreted at a similar nebular location.Our data suggest that the IIE meteorites formed on an internally heated H/HH chondrite-like body that experienced the initial stages of differentiation in response to radiogenic heating. However, prior to full differentiation the IIE parent body experienced a major hit-and-run style collision that resulted in silicate-metal mixing. The initial stages of this event involved a phase of rapid cooling that prevented unmixing of metal and silicates. Reassembly of the IIE parent body produced a large regolith blanket that facilitated subsequent slow cooling. The IIE parent body has probably experienced numerous subsequent less catastrophic collisions. The development of alkali glass textures in some differentiated inclusions is probably the result of one of these later events." @default.
- W1986207788 created "2016-06-24" @default.
- W1986207788 creator A5027063959 @default.
- W1986207788 date "2001-12-01" @default.
- W1986207788 modified "2023-09-26" @default.
- W1986207788 title "Mediterranean phosphate research: An introduction" @default.
- W1986207788 doi "https://doi.org/10.1016/s0151-9107(01)80094-5" @default.
- W1986207788 hasPublicationYear "2001" @default.
- W1986207788 type Work @default.
- W1986207788 sameAs 1986207788 @default.
- W1986207788 citedByCount "0" @default.
- W1986207788 crossrefType "journal-article" @default.
- W1986207788 hasAuthorship W1986207788A5027063959 @default.
- W1986207788 hasConcept C166957645 @default.
- W1986207788 hasConcept C185592680 @default.
- W1986207788 hasConcept C205649164 @default.
- W1986207788 hasConcept C2777132085 @default.
- W1986207788 hasConcept C4646841 @default.
- W1986207788 hasConcept C55493867 @default.
- W1986207788 hasConceptScore W1986207788C166957645 @default.
- W1986207788 hasConceptScore W1986207788C185592680 @default.
- W1986207788 hasConceptScore W1986207788C205649164 @default.
- W1986207788 hasConceptScore W1986207788C2777132085 @default.
- W1986207788 hasConceptScore W1986207788C4646841 @default.
- W1986207788 hasConceptScore W1986207788C55493867 @default.
- W1986207788 hasIssue "6" @default.
- W1986207788 hasLocation W19862077881 @default.
- W1986207788 hasOpenAccess W1986207788 @default.
- W1986207788 hasPrimaryLocation W19862077881 @default.
- W1986207788 hasRelatedWork W1597256687 @default.
- W1986207788 hasRelatedWork W1989639525 @default.
- W1986207788 hasRelatedWork W2061489844 @default.
- W1986207788 hasRelatedWork W2144190640 @default.
- W1986207788 hasRelatedWork W2152923009 @default.
- W1986207788 hasRelatedWork W2241828923 @default.
- W1986207788 hasRelatedWork W2555350691 @default.
- W1986207788 hasRelatedWork W2963667562 @default.
- W1986207788 hasRelatedWork W2980143834 @default.
- W1986207788 hasRelatedWork W2189439599 @default.
- W1986207788 hasVolume "26" @default.
- W1986207788 isParatext "false" @default.
- W1986207788 isRetracted "false" @default.
- W1986207788 magId "1986207788" @default.
- W1986207788 workType "article" @default.