$^{26}$Al-$^{26}$Mg isotopic, mineralogy, petrography of a Hibonite-Pyroxene Spherule in Allan Hills 77307 (CO3.03): Implications for the origin and evolution of these objects. (arXiv:2007.01856v1 [astro-ph.EP])
<a href="http://arxiv.org/find/astro-ph/1/au:+Mishra_R/0/1/0/all/0/1">Ritesh Kumar Mishra</a>
10 Hibonite-pyroxene/glass spherules discovered hitherto are a rare suite of
refractory inclusions that show the largest range of exotic isotopic properties
(anomalies in neutron rich isotopes (e.g., $^{48}$Ca, $^{50}$Ti), abundance of
$^{26}$Al) despite their defining simple spherical morphology and mineralogy
consisting predominantly of few hibonites nestled within/with glassy or
crystallised calcium, aluminium-rich pyroxene. $^{26}$Al-$^{26}$Mg
chronological studies along with petrography and mineralogy of a relatively
large (~120 micron diameter), found in Allan Hills 77307 (CO3.03) has been
performed. Uniquely, both hibonite and pyroxene show discordant abundance of
short-lived now-extinct radionuclide $^{26}$Al that suggest disparate and
distinct regions of origin of hibonite and pyroxene. The pristine petrography
and mineralogy of this inclusion allow discernment of their genesis and trend
of alteration in hibonite-pyroxene/glass spherules.
10 Hibonite-pyroxene/glass spherules discovered hitherto are a rare suite of
refractory inclusions that show the largest range of exotic isotopic properties
(anomalies in neutron rich isotopes (e.g., $^{48}$Ca, $^{50}$Ti), abundance of
$^{26}$Al) despite their defining simple spherical morphology and mineralogy
consisting predominantly of few hibonites nestled within/with glassy or
crystallised calcium, aluminium-rich pyroxene. $^{26}$Al-$^{26}$Mg
chronological studies along with petrography and mineralogy of a relatively
large (~120 micron diameter), found in Allan Hills 77307 (CO3.03) has been
performed. Uniquely, both hibonite and pyroxene show discordant abundance of
short-lived now-extinct radionuclide $^{26}$Al that suggest disparate and
distinct regions of origin of hibonite and pyroxene. The pristine petrography
and mineralogy of this inclusion allow discernment of their genesis and trend
of alteration in hibonite-pyroxene/glass spherules.
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