POTASSIUM-ARGON ISOTOPIC AGES ON MICAS FROM THE SOUTHERN APPALACHIANS

Journal Article · Sat Apr 01 04:00:00 EST 1961 · Annals of the New York Academy of Sciences (U.S.)

DOI:https://doi.org/10.1111/j.1749-6632.1961.tb35488.x· OSTI ID:4817068

Kulp, J L; Eckelmann, F D

Results are presented as part of a continuing study of the metamorphic- plutonic history of the Blue Ridge and Piedmont Provinces. K-Ar isotopic age studies were made on micas from these rocks. It was concluded that the rocks of the Blue Ridge Province were subjected to repeated metamorphic activity. The initial metumorphism of the basement occurred at least 1100 million years ago. A widespread metamorphism may have affected the area about 850 million years ago. The next clearly defined event took place between 450 and 550 million years ago. At 350 million years ago metamorphism occurred all along the western border of the southern Appalachian Province. This appears to have occurred in a zone at least 100 miles in width. About 250 million years ago, a belt of metamorphism developed in Georgia that may prove continuous through the eastern Piedmont of S. C. and N. C. (M.C.G.)

• Research Organization: Columbia Univ., New York; and Brown Univ., Providence
• Sponsoring Organization: USDOE
• NSA Number: NSA-16-027477
• OSTI ID: 4817068
• Journal Information: Annals of the New York Academy of Sciences (U.S.), Journal Name: Annals of the New York Academy of Sciences (U.S.) Vol. Vol: 91; ISSN ANYAA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

AGE ESTIMATION
APPALACHIAN MOUNTAINS
ARGON
DECAY
DEPOSITS
ENVIRONMENT
GEOLOGY
HEALTH AND SAFETY
ISOTOPES
METAMORPHIC ROCKS
MICA
POTASSIUM
ROCKS
SEDIMENTS