To investigate the initial stages of illitization in marine bentonites, fine-clay subfractions of Santonian bentonite samples from the Campos Basin, offshore Brazil, were examined by X-ray diffraction, K-Ar, and Rb-Sr methods (Clauer et al., 2020) and by chemical and isotopic analyses of B and Li (Clauer et al., 2022). Only three subfractions of fine clay from each of two bentonite samples were available for the latter study, so the results were characterized as preliminary information “thought to be of help for future studies” (Clauer et al., 2022, p. 73). A few substantial differences in boron content and...

You do not have access to this content, please speak to your institutional administrator if you feel you should have access.