Fluorian garnets from the host rocks of the Skaergaard intrusion: implications for metamorphic fluid composition
American Mineralogist
By: C. E. Manning and D.K. Bird
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Abstract
Zoned, silica-deficient, calcic garnets containing up to 5 mol% F substitution for O formed during contact metamorphism of basalts by the Skaergaard intrusion in East Greenland. Fluorian calcic garnets occur as a retrograde alteration of prograde wollastonite and clinopyroxene that fills vesicles and vugs in lavas 30-70 m from the intrusion. The F content of garnet is extremely sensitive to minor changes in fluid composition. The calculations show that a decrease in pH or an increase in log aF- of 0.3 at constant pressure and temperature will decrease the F concentration in garnet from 5 to 0 mol%. The results of this study show that fluorian hydrous grandites provide a mineralogical record of the activities of F species in coexisting metamorphic and hydrothermal fluids. -from Authors
Suggested Citation
Manning, C.E., Bird, D., 1990, Fluorian garnets from the host rocks of the Skaergaard intrusion: implications for metamorphic fluid composition: American Mineralogist, v. 75, no. 7-8, p. 859-873.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Fluorian garnets from the host rocks of the Skaergaard intrusion: implications for metamorphic fluid composition |
| Series title | American Mineralogist |
| Volume | 75 |
| Issue | 7-8 |
| Year Published | 1990 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | American Mineralogist |
| First page | 859 |
| Last page | 873 |