Dating Archean metamorphic minerals southeast of the Grenville front, western Quebec, using Pb isotopes

Journal Article · Thu Nov 01 04:00:00 EST 1990 · Geology; (USA)

DOI:https://doi.org/10.1130/0091-7613(1990)018<1078:DAMMSO>2.3.CO;2· OSTI ID:5572893

Gariepy, C; Verner, D ^[1]; Doig, R ^[2]

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1. Universite du Quebec a Montreal (Canada)
2. McGill Univ., Montreal, Quebec (Canada)

Pb-isotope ratios of high-grade metamorphic minerals such as K-feldspar, biotite, magnetite, apatite, sillimanite, and garnet define collinear arrays on {sup 207}Pb/{sup 204}Pb vs. {sup 206}Pb/{sup 204}Pb diagrams. The samples are from a zone extending 35 km southeast of the Grenville front; the dates are interpreted to reflect peak granulite conditions during an Archean metamorphic event having a minimum age of 2.65 Ga. The gneiss was derived from preexisting crustal precursors and was barely affected by the Grenvillian event, a milder perturbation followed by rapid uplift.

• OSTI ID: 5572893
• Journal Information: Geology; (USA), Journal Name: Geology; (USA) Vol. 18:11; ISSN GLGYB; ISSN 0091-7613
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
580000* -- Geosciences
AGE ESTIMATION
ALPHA DECAY RADIOISOTOPES
APATITES
BIOTITE
CANADA
CHALCOGENIDES
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
FELDSPARS
GARNETS
GEOLOGIC FORMATIONS
HEAVY NUCLEI
HOURS LIVING RADIOISOTOPES
IRON COMPOUNDS
IRON ORES
IRON OXIDES
ISOMERIC TRANSITION ISOTOPES
ISOTOPE DATING
ISOTOPE RATIO
ISOTOPES
LEAD 204
LEAD 206
LEAD 207
LEAD ISOTOPES
MAGNETITE
METAMORPHIC ROCKS
METAMORPHISM
MICA
MINERALS
NORTH AMERICA
NUCLEI
ORES
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PHOSPHATE MINERALS
QUEBEC
RADIOISOTOPES
ROCKS
SECONDS LIVING RADIOISOTOPES
SILICATE MINERALS
SILICATES
SILICON COMPOUNDS
STABLE ISOTOPES
TECTONICS
TRANSITION ELEMENT COMPOUNDS
YEARS LIVING RADIOISOTOPES