53Mn-53Cr Chronology of Ca-Fe Silicates in CV3 Chondrites
Glenn J. MacPherson, Kazuhide Nagashima, Alexander N. Krot, Patricia M. Doyle, Marina A. Ivanova
Geochimica et Cosmochimica Acta
In Press, Accepted Manuscript, Available online 1 October 2016
This study is dedicated to our late colleague and friend Dr. Ian D. Hutcheon, who pioneered the use of 53Mn-53Cr systematics in secondary minerals as a means of dating aqueous alteration in chondritic meteorites.
“High precision secondary ion mass-spectrometry (SIMS) analyses of kirschsteinite (CaFeSiO4) in the reduced CV3 chondrites Vigarano and Efremovka yield well resolved 53Cr excesses that correlate with 55Mn/52Cr, demonstrating in situ decay of the extinct short-lived radionuclide 53Mn. To ensure proper correction for relative sensitivities between 55Mn+ and 52Cr+ ions, we synthesized kirschsteinite doped with Mn and Cr to measure the relative sensitivity factor. The inferred initial ratio (53Mn/55Mn)0 in chondritic kirschsteinite is (3.71±0.50)×10–6. When anchored to 53Mn-53Cr relative and U-corrected 207Pb-206Pb absolute ages of the D’Orbigny angrite, this ratio corresponds to kirschsteinite formation View the MathML source3.2-0.7+08 Ma after CV Ca-, Al-rich inclusions. The kirschsteinite data are consistent within error with the data for aqueously-formed fayalite from the Asuka 881317 CV3 chondrite as reported by Doyle et al. (2015), supporting the idea that Ca-Fe silicates in CV3 chondrites are cogenetic with fayalite (and magnetite) and formed during metasomatic alteration on the CV3 parent body. Concentrically-zoned crystals of kirschsteinite and hedenbergite indicate that they initially formed as near end-member compositions that became more Mg-rich with time, possibly as a result of an increase in temperature.”