Buddingtonite, ammonium feldspar, in the Phosphoria Formation, southeastern Idaho
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Abstract
Buddingtonite is distributed widely in the rocks of the Meade Peak Member of the Phosphoria Formation in southeastern Idaho and occurs in amounts up to about 50 percent. Most of the buddingtonite is in the middle mudstone interval of the member between two phosphate-rich intervals. The composition of the buddingtonite, in terms of a buddingtonite K-feldspar series, shows an apparent range of Bd82KF18 to Bd13KF87, and compositions of Bd72KF28 to Bd50KF50 may be the most common. The predominant silicate mineral suite consists of buddingtonite-albite-illite. Albite is present in amounts up to about 20 percent. Buddingtonite may have developed directly from volcanic glass in the presence of abundant ammonium, derived from the decomposition of organic matter, in interstitial waters, or it may have formed at some later diagenetic stage from other products of volcanic glass alteration, such as montmorillonite or zeolites.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Buddingtonite, ammonium feldspar, in the Phosphoria Formation, southeastern Idaho |
| Series title | Journal of Research of the U.S. Geological Survey |
| Volume | 2 |
| Issue | 6 |
| Year Published | 1974 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Publisher location | Reston, VA |
| Description | 4 p. |
| First page | 693 |
| Last page | 696 |
| Country | United States |
| State | Idaho |
| Other Geospatial | Meade Peak |
| Online Only (Y/N) | N |
| Additional Online Files (Y/N) | N |
| Google Analytic Metrics | Metrics page |