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The Stillwater Complex, Montana - Overview and the significance of volatiles

Publication ,  Journal Article
Boudreau, AE
Published in: Mineralogical Magazine
June 1, 2016

The geology of the 2.7 Ga Stillwater Complex in South-Central Montana is reviewed with a focus on the role of volatiles in locally modifying both the crystallization sequence of the evolving parent magma and the initially precipitated solid assemblages to favour olivine ± chromite. A secondary origin for these two minerals is particularly probable for the olivine-bearing rocks of the Banded series and, at a minimum, also increasing their modal abundance in the Peridotite zone of the Ultramafic series. Direct evidence for volatiles includes the presence of high-temperature fluid inclusions in pegmatoids and hydrous melt inclusions (now crystallized) in chromite and olivine from both the Ultramafic and the Banded series rocks. Indirect evidence includes the boninitic character of the parent magma, the presence of volatile-bearing minerals including high-temperature carbonates, rock textures, and Cl / F variations in apatite. Mechanisms which favour the formation of olivine (± chromite) over pyroxene include volatile phase boundary shifts induced by added H2O, incongruent melting of pyroxene by hydration of a partly-molten mush, and the near- to sub-solidus replacement of pyroxene by olivine and chromite by silica-undersaturated fluids. These mechanisms cast doubt that magmas with different liquid lines of descent were involved in the crystallization of the Stillwater Complex. A dry Stillwater magma would have been mineralogically and modally much less varied and lacking in high-grade platinum-group element and chromium deposits.

Duke Scholars

Published In

Mineralogical Magazine

DOI

EISSN

1471-8022

ISSN

0026-461X

Publication Date

June 1, 2016

Volume

80

Issue

4

Start / End Page

585 / 637

Related Subject Headings

  • Geochemistry & Geophysics
  • 3705 Geology
  • 0403 Geology
  • 0306 Physical Chemistry (incl. Structural)
 

Citation

APA
Chicago
ICMJE
MLA
NLM
Boudreau, A. E. (2016). The Stillwater Complex, Montana - Overview and the significance of volatiles. Mineralogical Magazine, 80(4), 585–637. https://doi.org/10.1180/minmag.2016.080.063
Boudreau, A. E. “The Stillwater Complex, Montana - Overview and the significance of volatiles.” Mineralogical Magazine 80, no. 4 (June 1, 2016): 585–637. https://doi.org/10.1180/minmag.2016.080.063.
Boudreau AE. The Stillwater Complex, Montana - Overview and the significance of volatiles. Mineralogical Magazine. 2016 Jun 1;80(4):585–637.
Boudreau, A. E. “The Stillwater Complex, Montana - Overview and the significance of volatiles.” Mineralogical Magazine, vol. 80, no. 4, June 2016, pp. 585–637. Scopus, doi:10.1180/minmag.2016.080.063.
Boudreau AE. The Stillwater Complex, Montana - Overview and the significance of volatiles. Mineralogical Magazine. 2016 Jun 1;80(4):585–637.
Journal cover image

Published In

Mineralogical Magazine

DOI

EISSN

1471-8022

ISSN

0026-461X

Publication Date

June 1, 2016

Volume

80

Issue

4

Start / End Page

585 / 637

Related Subject Headings

  • Geochemistry & Geophysics
  • 3705 Geology
  • 0403 Geology
  • 0306 Physical Chemistry (incl. Structural)