Age and Regional Relationships of Granitoid Rocks of the Adirondack Highlands

Approximately 55% of the Adirondack highlands is underlain by granitic to tonalitic rocks that can be subdivided into five groups based on age, composition, and field occurrence: (1) early calcalkaline tonalites (ca. 1300 Ma) and associated granitic rocks (ca. 1250 Ma) of the southern and eastern hi...

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Veröffentlicht in:	The Journal of geology 1991-07, Vol.99 (4), p.571-590
Hauptverfasser:	Chiarenzelli, Jeffrey R., McLelland, James M.
Format:	Artikel
Sprache:	eng
Schlagworte:	ADIRONDACK MOUNTAINS AGE DEPENDENCE AGE ESTIMATION Anorthosite APPALACHIAN MOUNTAINS CANADA CHEMICAL COMPOSITION COMPARATIVE EVALUATIONS DEVELOPED COUNTRIES EVALUATION Geochronology GEOLOGIC FORMATIONS GEOLOGIC HISTORY GEOLOGY GEOSCIENCES Gneiss Granite GRANITES Highlands IGNEOUS ROCKS ISOTOPE RATIO Massifs MINERALS MOUNTAINS NORTH AMERICA ONTARIO PLUTONIC ROCKS Pyroxenes QUEBEC ROCKS SILICATE MINERALS 580000 > Geosciences STRATIGRAPHY Syenite VERMONT ZIRCON
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