A study of sampling requirements to determine modal variability within the Lakeview Mountains pluton, northern Peninsular Ranges batholith, southern California

A.K. Baird; W.B. Wadsworth; D.M. Morton

doi:10.1130/2014.1211(12)

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GSA Memoirs

Peninsular Ranges Batholith, Baja California and Southern California

Author(s)

Geological Society of America

Volume

211

DOI:

https://doi.org/10.1130/MEM211

Attribution:You must attribute the work in the manner specified by the author or licensor (but not in any way that suggests that they endorse you or your use of the work). Noncommercial ‒ you may not use this work for commercial purpose. No Derivative works ‒ You may not alter, transform, or build upon this work. Sharing ‒ Individual scientists are hereby granted permission, without fees or further requests to GSA, to use a single figure, a single table, and/or a brief paragraph of text in other subsequent works and to make unlimited photocopies of items in this journal for noncommercial use in classrooms to further education and science.

ISBN print:

9780813712116

Publication date:

January 01, 2014

Book Chapter

A study of sampling requirements to determine modal variability within the Lakeview Mountains pluton, northern Peninsular Ranges batholith, southern California

Author(s)

A.K. Baird

Department of Geology, Pomona College, Claremont, California 91711, USA

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;

W.B. Wadsworth

Stagecoach Road, Marshfield, Maine 04654, USA

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;

D.M. Morton

U.S. Geological Survey and Department of Earth Sciences, University of California, Riverside, California 92521, USA

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Doi:

https://doi.org/10.1130/2014.1211(12)

Published:

January 01, 2014

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...

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Peninsular Ranges Batholith, Baja California and Southern California

A study of sampling requirements to determine modal variability within the Lakeview Mountains pluton, northern Peninsular Ranges batholith, southern California

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