Origin and evolution of the ureilite parent magmas - Multi-stage igneous activity on a large parent body

Details Origin and evolution of the ureilite parent magmas - Multi-stage igneous activity on a large parent body Origin and evolution of the ureilite parent magmas - Multi-stage igneous activity on a large parent body

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gecoa..51.2255g&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 51, Sept. 1987, p. 2255-2273.

Mathematics

56

Evolution (Development), Igneous Rocks, Magma, Meteoritic Composition, Ureilites, Crystallization, Electron Microscopy, Mathematical Models, Olivine, Petrography, Pyroxenes, Meteorites, Origin, Evolution, Parent Material, Ureilites, Achondrites, Size, Parent Bodies, Magmas, Samples, Meteorite, Laboratory Studies, Olivine, Pigeonite, Minor Elements, Lithophiles, Composition, Mineralogy, Formation, Reduction, Element Ratios, Models, Genesis, Crystallization, Melting, Differentiation, Chronology, Cumulates, Si

Scientific paper

The minor-element/major-element trends among the ureilites were investigated using electron microprobe data on olivine and pigeonite cores in eight low-shock ureilites. The results show well-defined correlations between Fe/X (where X is one of the minor elements Mn, Cr, Ca, Al, Ti, P, or Ni) and Fe/Mg ratios. For the lithophile minor elements, these trends are linear, with positive slope, and pass through or near the origin, indicating various degrees of FeO reduction of the parent magmas. The trends shown by P and Ni are consistent with this interpretation and require, in addition, equilibrium crystallization of 20-27 mole pct metal. A model is proposed for generation and crystallization of ureilite parent magmas, which predicts that the ureilite parent body had a differentiated crust, did not have a core, and was at least 235 km in radius.

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