U-Pb zircon geochronology of the Adirondack Mountains and implications for their geologic evolution

Journal Article · Sat Oct 01 00:00:00 EDT 1988 · Geology; (USA)

DOI:https://doi.org/10.1130/0091-7613(1988)016<0920:UPZGOT>2.3.CO;2· OSTI ID:7166772

McLelland, J ^[1]; Chiarenzelli, J ^[2]; Whitney, P; Ischsen, Y ^[3]

---

1. Colgate Univ. Hamilton, NY (USA)
2. Univ. of Kansas, Lawrence (USA)
3. New York Geological Survey, Albany (USA)

U-Pb zircon studies of metamorphosed igneous rocks in the Adirondack Mountains have yielded preliminary ages within the range 1420-990 Ma. Several geochronologically and geochemically distinct episodes of igneous intrusion and at least one pre-granulite facies dynamothermal metamorphic event are documented. This information is consistent with recent field and geochronological studies throughout the Grenville province and suggests that a complex sequence of events occurred in the Adirondack Mountains prior to the widespread deformation and metamorphism commonly attributed to the {approximately} 1100-1000 Ma Ottawan phase of the Grenvillian orogenic cycle.

• OSTI ID: 7166772
• Journal Information: Geology; (USA), Journal Name: Geology; (USA) Journal Issue: 10 Vol. 16:10; ISSN GLGYB; ISSN 0091-7613
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
580000* -- Geosciences
ACTINIDES
ADIRONDACK MOUNTAINS
AGE ESTIMATION
APPALACHIAN MOUNTAINS
DEFORMATION
ELEMENTS
GEOLOGIC HISTORY
IGNEOUS ROCKS
INTRUSION
ISOTOPE DATING
LEAD
METALS
METAMORPHISM
MINERALS
MOUNTAINS
OROGENESIS
OXYGEN COMPOUNDS
ROCKS
SILICATE MINERALS
SILICATES
SILICON COMPOUNDS
TECTONICS
TRANSITION ELEMENT COMPOUNDS
URANIUM
ZIRCON
ZIRCONIUM COMPOUNDS
ZIRCONIUM SILICATES