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Data Series 895

Geochemical and Petrographic Data for Intrusions Peripheral to the Big Timber Stock, Crazy Mountains, Montana

By Edward A. du Bray, Anna B. Wilson, and Bradley S. Van Gosen

Thumbnail of and link to report PDF (2.4 MB)Abstract

The Paleocene Fort Union Formation hosts a compositionally diverse array of Eocene plugs, dikes, and sills arrayed around the Eocene Big Timber stock in the Crazy Mountains of south-central Montana. The geochemistry and petrography of the sills have not previously been characterized or interpreted. The purpose of this report is (1) to present available geochemical and petrographic data for several dozen samples of these rocks and (2) to provide a basic interpretive synthesis of these data.

First posted February 4, 2015

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U.S. Geological Survey
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Denver, CO 80225
http://minerals.cr.usgs.gov/

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Suggested citation:

du Bray, E.A., Wilson, A.B., and Van Gosen, B.S., 2015, Geochemical and petrographic data for intrusions peripheral to the Big Timber stock, Crazy Mountains, Montana: U.S. Geological Survey Data Series 895, 19 p., https://dx.doi.org/10.3133/ds895.

ISSN 2327-638X (online)



Contents

Introduction

Analytical Methods

Data Fields

Geochemical Characteristics

Petrographic Characteristics

Synthesis

Acknowledgments

References Cited

Appendix 1. Status and Treatment of Samples of Sills and Plugs Peripheral to the Big Timber Stock, Crazy Mountains, Montana

Appendix 2. Geochemical and Petrographic Data for Samples of Sills and Plugs Peripheral to the Big Timber Stock, Crazy Mountains, Montana


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