Carbon isotopes in pelites of the Precambrian Uncompahgre Formation, Needle Mountains, Colorado
Geological Society of America Bulletin
By: Fred Barker and Irving Friedman
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Abstract
Carbon isotopic ratios and weight percentages of carbon were measured in 15 samples of slate, phyllite, and schist of the approximately 1500- to 1600-m.y.-old Uncompahgre Formation of the Needle Mountains, southwestern Colorado. Rocks with less than 1 percent total carbon, all of which is reduced, have δC13 values of −23 to −28 per mil, whereas those with 1 to 6.4 percent carbon have δC13 from −29 to −31 per mil. In general, the slates and phyllites contain more carbon and isotopically lighter carbon than do the schists of higher metamorphic rank. Increasing loss of C12-enriched methane with increasing intensity of metamorphism is suggested to account for these differences.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Carbon isotopes in pelites of the Precambrian Uncompahgre Formation, Needle Mountains, Colorado |
| Series title | Geological Society of America Bulletin |
| DOI | 10.1130/0016-7606(1969)80[1403:CIIPOT]2.0.CO;2 |
| Volume | 80 |
| Issue | 7 |
| Year Published | 1969 |
| Language | English |
| Publisher | Geological Society of America |
| Description | 5 p. |
| First page | 1403 |
| Last page | 1407 |
| Country | United States |
| State | Colroado |
| Other Geospatial | Needle Mountains, Precambrian Uncompahgre Formation |