Geology

The pegmatites of New York, mostly of NYF-type, occur in calc-silicates in the Adirondack Lowlands and in the metasedimentary sequences south and east of the Marcy anorthosite (1155 Ma) in the Highlands. The study of the mineral distribution and the trace element geochemistry within the pegmatite bodies is used to understand their petrogenesis and internal evolution. The U-Pb geochronology is applied to constrain the timing of igneous, metamorphic, and deformational events associated with Shawinigan, Ottawan, and Rigolet orogenesis.