Early solar system evolution

 
Aluminum-26 chronology of dust coagulation and early solar system evolution

Dust condensation and coagulation in the early solar system are the first steps toward forming the terrestrial planets, but the time scales of these processes remain poorly constrained. SIMS isotopic analysis were performed on small Ca-Al–rich inclusions (30 to100 µm in size) found in one of the most pristine chondrites. In situ isotope analyses of 26Al-26Mg were obtained with LG-SIMS using 1 to 8 nA O− primary ion beam (Ø ~1.5 to 4 µm) generated by an oxygen RF-plasma source. Mg and Al secondary ion signals were intense enough to be simultaneously measured with multiple FCs. Results of this study suggest a 50,000-year time scale between the condensation of micrometer-sized dust and formation of inclusions tens of micrometers in size.

Recorded on CAMECA IMS 1290-HR equipped with an oxygen RF-plasma source at UCLA, Los Angeles, USA. Image courtesy of M.-C. Liu.
M.-C. Liu et al, Aluminum-26 chronology of dust coagulation and early solar system evolution, Science Advances 5, eaaw3350 (2019).

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