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High-resolution P-T-t paths from delta (super 18) O zoning in titanite; a snapshot of late-orogenic collapse in the Grenville of New York

Chloe E. Bonamici, Reinhard Kozdon, Takayuki Ushikubo and John W. Valley
High-resolution P-T-t paths from delta (super 18) O zoning in titanite; a snapshot of late-orogenic collapse in the Grenville of New York
Geology (Boulder) (October 2011) 39 (10): 959-962

Abstract

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 (super 18) O, up to 0.6 per mil 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.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 39
Serial Issue: 10
Title: High-resolution P-T-t paths from delta (super 18) O zoning in titanite; a snapshot of late-orogenic collapse in the Grenville of New York
Affiliation: University of Wisconsin, Department of Geoscience, Madison, WI, United States
Pages: 959-962
Published: 201110
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 33
Accession Number: 2011-097152
Categories: Isotope geochemistryStructural geology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 2011281
Illustration Description: illus. incl. sect., sketch map
N44°00'00" - N44°00'00", W75°00'00" - W75°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201150
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