Skip to Main Content
Book Chapter

Discussion—Stillwater, Montana Chromite Deposits

By
Edward Sampson
Edward Sampson
Department of Geology, Princeton University, Princeton, New Jersey
Search for other works by this author on:
Published:
January 01, 1969

Abstract

Edward Sampson. In discussing Mr. Jackson's paper I should like to make a few remarks concerning mainly the Mountain View area. Before 1930 the group of rocks now known as the Stillwater complex has been described (Westgate, 1922) as an intrusive dike or sill invading a Precambrian complex and of Laramide age. In 1930 I recognized it as a complex closely similar to the Bushveld complex. Mr. Peoples and Mr. Howland, then graduate students at Princeton University, were assigned to work on the complex for doctoral dissertations. In 1936 a brief account (Howland et al., 1936) was published. Work continued until the outbreak of World War II under great difficulties as no adequate maps were available. A number of chemical analyses of carefully cleaned chromites were made. Then all information of Princeton University was turned over to the U. S. Geological Survey and Peoples and Howland joined the Survey staff.

Clearly crystal settling within the magma chamber is the controlling process (Fig. 1), although in certain places irregular intrusive relations are found as shown in Figure 2.

You do not currently have access to this article.

Figures & Tables

Contents

Society of Exploration Geophysicists Geophysical Monograph Series

Magmatic Ore Deposits

H. D. B. Wilson
H. D. B. Wilson
Search for other works by this author on:
Society of Economic Geologists
Volume
4
ISBN electronic:
9781934969991
Publication date:
January 01, 1969

GeoRef

References

Related

Citing Books via

Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal