Abstract
The 3000 km2 Marcy anorthosite massif dominates the Adirondack Highlands (Grenville Province, New York). The Marcy massif was metamorphosed to granulite facies conditions, in places preserving igneous textures with metamorphic coronas and is most deformed near its margins. Historically, the relationship between anorthosite emplacement and metamorphism has been controversial, and many workers have argued that anorthosite emplacement coincided with metamorphism. Valley and O’Neil (1982) proposed that high-pressure metamorphic mineral assemblages in the anorthosite could not reflect the same event that formed wollastonite skarns adjacent to anorthosite, which have low δ18O and formed in the presence of meteoric water during shallow emplacement. This study presents new in-situ geochronology that constrains the timing of metamorphic mineral growth in Adirondack anorthosite to 1050–1035 Ma. The Zr source for metamorphic zircon growth was the breakdown of hemoilmenite and is texturally linked to high-pressure mineral assemblages. These data are consistent with previously determined ca. 1155 Ma magmatic ages and later granulite facies metamorphism during the 1090–1020 Ma Ottawan phase of the Grenvillian orogeny.
Acknowledgments
This paper is in honor of John W. Valley, Charles R. Van Hise Professor of Geoscience at the University of Wisconsin, who is thanked for his ongoing research collaboration, encouragement, and support. This paper is also in memory of Bruce W. Selleck, Thomas A. Bartlett Chair and Professor of Geology at Colgate University, who passed away on July 31, 2017. We thank Jeff Chiarenzelli for pointing us toward many of the sampling localities in this study. Mark Pecha and the staff at the Arizona LaserChron Center are thanked for analytical support (supported by National Science Foundation grant EAR 1338583). Jorge Vasquez and the staff at the SHRIMP-RG facility at Stanford University are also acknowledged for analytical support [supported by the U.S. Geological Survey National Cooperative Geological Mapping Program (NGCMP)]. John Fournelle is thanked for assistance with cathodoluminescence imaging. Peter Valley and an anonymous reviewer are thanked for helpful feedback on this manuscript. Howard and Kozel were supported by the Douglas W. Rankin ’53 Endowment for Geology Research. Selleck was supported by the Malcolm ’54 and Sylvia Boyce Fund and the Thomas A. Barlett Chair at Colgate University for analytical and field costs.
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