Cosmoradiogenic ghosts and the origin of Ca-Al-rich inclusions

Details Cosmoradiogenic ghosts and the origin of Ca-Al-rich inclusions Cosmoradiogenic ghosts and the origin of Ca-Al-rich inclusions

Jul 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977e%26psl..35..398c&link_type=abstract

Earth and Planetary Science Letters, vol. 35, no. 3, July 1977, p. 398-410. Research supported by the Alexander von Humboldt Fo

Computer Science

25

Abundance, Aluminum, Calcium, Meteoritic Composition, Radioactive Age Determination, Radiogenic Materials, Lead Isotopes, Magnesium Isotopes, Rubidium Isotopes, Strontium Isotopes, Trace Elements, Uranium 235, Uranium 238

Scientific paper

The Ca-Al-rich inclusions within Allende are described as quickly frozen nonequilibrated partial melts arising from energetic collisions between centimeter-sized mechanical accumulations of cold presolar grains. The resulting minerals are refractory-rich because refractory supernova condensates are the most persistent components of the preheated accumulates. The shock heating drives off most of the more volatile matrix that had accumulated cold around the refractory cores, which quickly recrystallize while picking up isotopically homogenized trace elements. This picture is advanced to account for the isotopic anomalies in those elements for which fractionation of stardust from gas also fractionates a special isotope whose stellar condensation history can be expected to have been special. The anomaly that would have existed before the special component was added is called an isotopic ghost. These ghosts can be larger than the special anomaly surviving today in meteorites and planets. It is argued that ghosts in Mg-26/Mg-24, Sr-87/Sr-86, and Pb-206, 207/Pb-204 have caused erroneous cosmoradiogenic estimates of large age differences between meteorites, their special phases, and even the moon.

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