Skip to Main Content
Skip Nav Destination

Tonalite of the Lakeview Mountains pluton is extremely heterogeneous in modal composition at both locality and outcrop scales. We applied an X-ray diffraction (XRD) method of modal analysis to 335 whole-rock powders previously used to study variability in major-element chemistry. We developed sampling levels appropriate for XRD modal study, mapped compositional gradients, recognized contrasts between chemical and modal variability, and tested the XRD method's suitability for petrologic investigations. Modal variability was determined at differing scales ranging from drill-core samples and hand specimens to 610 m2 subareas of the pluton. Compositing of three hand samples reduced variance within subareas of...

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

or Create an Account

Close Modal
Close Modal