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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Bibliographic Details
Published in:The Journal of geology 1991-07, Vol.99 (4), p.571-590
Main Authors: Chiarenzelli, Jeffrey R., McLelland, James M.
Format: Article
Language:English
Subjects:
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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Summary: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 highlands, (2) older anorogenic plutonic rocks (1145-1160 Ma) that occur throughout the highlands, (3) younger anorogenic plutonic rocks (ca. 1130 Ma) that envelop anorthosite massifs in the central highlands, (4) younger granitic rocks (1095-1105 Ma) of the northwest highlands, and (5) late leucogranitic rocks (1060-1080 Ma) that occur throughout the northern highlands. The data presented here are in good agreement with zircon ages from the Green Mountains of Vermont as well as from southern Ontario and Quebec and suggest similar geologic histories for these regions. These results document a protracted and complicated evolution for this portion of the Grenville Province.
ISSN:0022-1376
1537-5269
DOI:10.1086/629518