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Selected Studies of Archean Gneisses and Lower Proterozoic Rocks, Southern Canadian Shield
Editor(s)
Geological Society of America
Copyright:
© 1980 Geological Society of America
Geological Society of America
ISBN print:
9780813721828
Publication date:
January 01, 1980
Book Chapter
Early Archean Sm-Nd model ages from a tonalitic gneiss, northern Michigan
Author(s)
-
Published:January 01, 1980
Sm-Nd model ages on a whole-rock sample of the gneiss at Watersmeet, Michigan, show that these rocks were added to the continental crust about 3,600 m.y. ago. These model ages are calculated by assuming that the rocks were derived from a mantle reservoir with the Sm/Nd ratio of CHUR, which corresponds approximately to the chondritic ratio. These data confirm the U-Th-Pb zircon results that indicated a minimum age of 3,410 m.y. and possibly an age as old as 3,800 m.y. This study further illustrates the utility of Sm-Nd model ages in deciphering the history of complex Precambrian terranes.
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Index Terms/Descriptors
- absolute age
- Archean
- Canadian Shield
- crust
- dates
- diorites
- geochronology
- gneisses
- Gogebic County Michigan
- Great Lakes region
- igneous rocks
- isotopes
- metals
- metamorphic rocks
- Michigan
- Michigan Upper Peninsula
- models
- neodymium
- North America
- plutonic rocks
- Precambrian
- rare earths
- ratios
- samarium
- Sm/Nd
- Southern Province
- tonalite
- United States
- Watersmeet
- mantle reservoir
Latitude & Longitude
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