Mathematics – Logic
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003trgeo...1..247b&link_type=abstract
Treatise on Geochemistry, Volume 1. Editor: Andrew M. Davis. Executive Editors: Heinrich D. Holland and Karl K. Turekian. pp. 71
Mathematics
Logic
10
Scientific paper
Chondritic meteorites contain a complex record of processes that occurred during the earliest stages of solar system evolution, from the formation of the earliest solids by condensation in the solar nebula to the accretion of asteroidal parent bodies and subsequent processing within these small planetesimals. Of key interest is the very earliest history of nebular solids, which provide important constraints on nebular conditions and processes that are the ground truth for astrophysical models of nebular evolution (e.g., Boss, 1996; Shu et al., 1996; Jones et al., 2000). Although chondritic meteorites certainly contain a record of nebular processes, this very early record has been modified or obscured to different degrees by later processing. A major area of endeavor for researchers studying chondritic meteorites is to identify the nature of this secondary processing and establish where this processing occurred. This is a complex and challenging task, because secondary processing can occur in different environments and/or times and manifests itself in primitive chondrites in a number of different ways. These include, but are not limited to, aqueous alteration, oxidation, and metasomatism/metamorphism. This chapter reviews the cosmochemical evidence for secondary alteration within a framework of mineralogical observations and evaluates the evidence for nebular versus asteroidal alteration of chondritic materials.
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