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Incremental melting in the ureilite parent body: Initial composition, melting temperatures, and melt compositions

Collinet, Max and Grove, Timothy (2020) Incremental melting in the ureilite parent body: Initial composition, melting temperatures, and melt compositions. Meteoritics & Planetary Science, 55 (4), pp. 832-856. Wiley. doi: 10.1111/maps.13471. ISSN 1086-9379.

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Official URL: https://onlinelibrary.wiley.com/doi/full/10.1111/maps.13471

Abstract

Ureilites are carbon‐rich ultramafic achondrites that have been heated above the silicate solidus, do not contain plagioclase, and represent the melting residues of an unknown planetesimal (i.e., the ureilite parent body, UPB). Melting residues identical to pigeonite‐olivine ureilites (representing 80% of ureilites) have been produced in batch melting experiments of chondritic materials not depleted in alkali elements relative to the Sun’s photosphere (e.g., CI, H, LL chondrites), but only in a relatively narrow range of temperature (1120 ºC–1180 ºC). However, many ureilites are thought to have formed at higher temperature (1200 ºC–1280 ºC). New experiments, described in this study, show that pigeonite can persist at higher temperature (up to 1280 ºC) when CI and LL chondrites are melted incrementally and while partial melts are progressively extracted. The melt productivity decreases dramatically after the exhaustion of plagioclase with only 5–9 wt% melt being generated between 1120 ºC and 1280 ºC. The relative proportion of pyroxene and olivine in experiments is compared to 12 ureilites, analyzed for this study, together with ureilites described in the literature to constrain the initial Mg/Si ratio of the UPB (0.98–1.05). Experiments are also used to develop a new thermometer based on the partitioning of Cr between olivine and low‐Ca pyroxene that is applicable to all ureilites. The equilibration temperature of ureilites increases with decreasing Al2O3 and Wo contents of pyroxene and decreasing bulk REE concentrations. The UPB melted incrementally, at different fO2, and did not cool significantly (0 ºC–30 ºC) prior to its disruption. It remained isotopically heterogenous, but the initial concentration of major elements (SiO2, MgO, CaO, Al2O3, alkali elements) was similar in the different mantle reservoirs.

Item URL in elib:https://elib.dlr.de/137521/
Document Type:Article
Title:Incremental melting in the ureilite parent body: Initial composition, melting temperatures, and melt compositions
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Collinet, Maxmax.collinet (at) dlr.dehttps://orcid.org/0000-0002-8791-9751
Grove, TimothyDept. of Earth Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambrige, USAUNSPECIFIED
Date:2020
Journal or Publication Title:Meteoritics & Planetary Science
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:55
DOI :10.1111/maps.13471
Page Range:pp. 832-856
Publisher:Wiley
ISSN:1086-9379
Status:Published
Keywords:ureilite parent body, melting temperatures, melt composition
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Exploration of the Solar System, R - Vorhaben Planetary Evolution and Life (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Physics
Deposited By: Plesa, Dr. Ana-Catalina
Deposited On:17 Nov 2020 09:56
Last Modified:17 Nov 2020 09:56

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