The Stillwater Complex and its anorthosites: an accident of magmatic underplating?
American Mineralogist
By: G.K. Czamanske and S.R. Bohlen
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Abstract
The Stillwater Complex, emplaced 2700??40 Ma, is exposed at the edge of a 4000-km2 block of Late Archean rocks that formed 40 to 110 m.y. yearlier. Voluminous plagioclase cumulates (anorthosites) within the Middle Banded series of the complex are difficult to explain either by in situ fractionation of mafic magma or by popular models for mixing of two magma types. Current models for the evolution of the lowermost continental crust by magmatic underplating suggest that a major crust-forming event of about 100 m.y. duration would satisfy geologic and geochemical constraints for the formation of the Stillwater Complex and the related granitoids. -from Authors
Suggested Citation
Czamanske, G., and Bohlen, S., 1990, The Stillwater Complex and its anorthosites: an accident of magmatic underplating?: American Mineralogist, v. 75, no. 1-2, p. 37-45.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | The Stillwater Complex and its anorthosites: an accident of magmatic underplating? |
| Series title | American Mineralogist |
| Volume | 75 |
| Issue | 1-2 |
| Year Published | 1990 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | American Mineralogist |
| First page | 37 |
| Last page | 45 |