Al-Mg systematics of hibonite-bearing Ca,Al-rich inclusions from Ningqiang

Be-B SYSTEMATICS OF HIBONITE-BEARING INCLUSIONS FROM MURCHISON

Al-Mg systematics of CAis, POI, and ferromagnesian chondrules from Ningqiang

We have made aluminum-magnesium isotopic measurements on 4 melilite-bearing calcium-aluminum-rich inclusions (CAis), plagioclase-olivine inclusion (POI), and 2 ferromagnesian chondrules from the ingqiang carbonaceous chondrite. All of the CAJs measured contain clear evidence for radiogenic 26Mg* from the decay of26AI (r = 1.05 Ma). A lthough the low AI/Mg ratios of the melilites introduce large...

Al-mg Dating of Ca-al-rich Inclusions in Acfer 094 Chondrite

Introduction: Acfer 094 is one of the most primitive chondrites, which appears to have escaped thermal metamorphism above 300°C [1] and can potentially provide important clues to primary, undisturbed by parent body processes, abundances of short-lived ra-dionuclides in its components. Krot et al. [2] have recently described mineralogy and petrography of the Al-rich chondrules and refractory inc...

Presolar isotopic and chemical signatures in hibonite-bearing refractory inclusions from the Murchison carbonaceous chondrite

Magnesium-, calcium-, and titanium-isotopic compositions, as well as trace-element abundances, have been determined by ion microprobe mass spectrometry for 37 hibonite-bearing inclusions from the Murchison carbonaceous chondrite. These and previously analyzed hibonite-bearing inclusions can be divided into three main groups based on morphological and mineralogical criteria. PLAty Crystal fragme...

Al-Mg ISOTOPE SYSTEMATICS IN THE EFREMOVKA

Introduction: In recent years, the calcium-aluminum-rich inclusion (CAI) E60 from the Efremovka reduced CV3 chondrite has been used as an age anchor for the Al-Mg extinct chronome-ter (t 1/2 ~0.73 Ma) since an internal Al-Mg isochron corresponding to a 26 Al/ 27 Al ratio of (4.63±0.44)×10-5 has been determined for it [1] and a highly precise 207 Pb-206 Pb age of 4567.11±0.16 Ma has also been re...