Journal
GEOLOGY
Volume 39, Issue 10, Pages 959-962Publisher
GEOLOGICAL SOC AMER, INC
DOI: 10.1130/G32130.1
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Funding
- U.S. National Science Foundation (NSF) [EAR-0838058]
- U.S. Department of Energy [93ER14389]
- Geological Society [9224-10]
- NSF [EAR-0319230, EAR-0744079, EAR-1053466]
- Directorate For Geosciences
- Division Of Earth Sciences [1053466] Funding Source: National Science Foundation
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We characterize oxygen isotope zoning within single titanite crystals from the Carthage-Colton mylonite zone (CCMZ), Adirondack Mountains (New York State, United States), by ion microprobe. Smooth gradients of delta O-18, up to 0.6% over 90 mu m, resulted from diffusive exchange of oxygen during cooling from peak metamorphic temperatures of 650-700 degrees C. Modeling of the observed profile indicates punctuated cooling rates of 30-60 degrees C/m.y. along the CCMZ, set within long periods of much slower cooling. These results indicate a previously unrecognized period of rapid cooling along the CCMZ that is interpreted to result from the post-Ottawan collapse of the Grenville mountain belt and exhumation of the central Adirondack Highlands at ca. 1050 Ma.
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