Chondrules as direct thermochemical sensors of solar protoplanetary disk gas.

ABSTRACT: Chondrules, millimeter-sized igneous spherules comprising the major component of most chondritic meteorites, formed during the first 4 million to 5 million years of the evolution of the solar protoplanetary disk and, therefore, can potentially offer important constraints on the conditions in the disk, provided that the processes that led to their formation can be understood. High-resolution cathodoluminescence (CL) survey of chondrules from various chondrite groups revealed changes of CL activator concentrations of magnesium-rich olivines. We show that these overlooked internal zoning structures provide evidence for high-temperature gas-assisted near-equilibrium epitaxial growth of olivines during chondrule formation. We argue that this interaction with the surrounding gas, rather than var

SUBMITTER: Libourel G 

PROVIDER: S-EPMC6040862 | biostudies-literature | 2018 Jul

REPOSITORIES: biostudies-literature