Accessory apatite from hybrid granitoid rocks of the southern Snake Range, Nevada
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Abstract
Analytical data, optical properties, and unit-cell parameters are presented for 24 samples of accessory apatites recovered from hybrid granitoid rocks of the southern Snake Range, Nev. A complete chemical analysis is given for one. In the Snake Creek-Williams Canyon
outcrop area, where the hybrid rocks grade from granodiorite with 63 percent SiO2 to a quartz monzonite with 76 percent SiO2 within a
horizontal distance of about 3 miles, abundance and crystal habit of the apatite change with rock chemistry. The apatite probably is slightly
more than 90 mole percent fluorapatite in the most felsic rocks, slightly less in the most mafic. The range of F->OH substitution in apatite from this outcrop area is much smaller than in the coexisting biotites. Except for manganese, strontium, sodium, and the rare earths, there is very limited substitution for calcium in the crystal structure of these apatites. Apatites from the more mafic rocks tend to contain a lighter,
more basic assemblage of rare earths, in agreement with results obtained for coexisting allanites, monazites, and zircons.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Accessory apatite from hybrid granitoid rocks of the southern Snake Range, Nevada |
| Series title | Journal of Research of the U.S. Geological Survey |
| Volume | 1 |
| Issue | 1 |
| Year Published | 1973 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Publisher location | Reston, VA |
| Description | 10 p. |
| First page | 89 |
| Last page | 98 |
| Country | United States of America |
| State | Nevada |
| Other Geospatial | Southern Snake Range |
| Online Only (Y/N) | N |
| Additional Online Files (Y/N) | N |
| Google Analytic Metrics | Metrics page |