Plutonism, deformation, and metamorphism in the Proterozoic Flin Flon greenstone belt, Canada: Limits on timing provided by the single-zircon Pb-evaporation technique

Journal Article · Wed May 01 00:00:00 EDT 1991 · Geology; (USA)

DOI:https://doi.org/10.1130/0091-7613(1991)019<0518:PDAMIT>2.3.CO;2· OSTI ID:5470332

Ansdell, K M; Kyser, T K ^[1]

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1. Univ. of Saskatchewan, Saskatoon (Canada)

The authors have used the single-zircon Pb-evaporation technique to determine the age of granitoids in the western Flin Flon domain of the Trans-Hudson orogen in Canada and to constrain the timing of molasse sedimentation, deformation, metamorphism, and mesothermal gold mineralization. The plutons were intruded between 1,860 and 1,834 Ma, about 30 m.y. after volcanism, and provide further evidence of a major period of intrusive activity throughout the Trans-Hudson orogen at that time. The older plutons (1,860 to 1,848 Ma) are synchronous with P2 deformation and the early stages of peak metamorphism, whereas the younger plutons are synchronous with or postdate the P3 deformation event. Molasse sedimentary units are deformed and metamorphosed; thus, deposition must have begun at about 1,860 Ma. Mesothermal gold mineralization postdates all plutons and may be related to high-grade peak metamorphism in adjacent terranes at about 1,815 Ma. This study also provides further support for the use of the Pb-evaporation technique as a suitable method for dating single zircons and indicates that the {sup 208}Pb/{sup 206}Pb ratio of zircons may be a useful tool in detecting the presence and source of xenocrystic zircons.

• OSTI ID: 5470332
• Journal Information: Geology; (USA), Vol. 19:5; ISSN 0091-7613
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
CANADA
GEOLOGIC FORMATIONS
AGE ESTIMATION
DEFORMATION
EVAPORATION
GEOLOGY
GOLD ORES
GRANITES
ISOTOPE DATING
ISOTOPE RATIO
LEAD 206
LEAD 208
LEAD ISOTOPES
MEASURING METHODS
METAMORPHISM
MINERALIZATION
OROGENESIS
PLUTONIC ROCKS
PRECAMBRIAN ERA
SEDIMENTATION
VOLCANISM
ZIRCON
DEVELOPED COUNTRIES
EVEN-EVEN NUCLEI
GEOLOGIC AGES
HEAVY NUCLEI
IGNEOUS ROCKS
ISOTOPES
MINERALS
NORTH AMERICA
NUCLEI
ORES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
ROCKS
SILICATE MINERALS
SILICATES
SILICON COMPOUNDS
STABLE ISOTOPES
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
ZIRCONIUM SILICATES
580000* - Geosciences