Sm-Nd age of the Fiskenaesset Anorthosite Complex, West Greenland

• Main Authors: Ashwal, Lewis D., Goldstein, Steven J., Jacobsen, Stein B., Myers, John S., Kalsbeek, Feiko
• Format: Other/Unknown Material
• Language: unknown
• Published: 1989
• Subjects: 46; Greenland
• Online Access: http://ntrs.nasa.gov/search.jsp?R=19890042932

A Sm-Nd isotopic study on samples from the Fiskenaesset Anorthosite Complex in West Greenland was conducted to estimate the age of crystallization of the complex. A five-point isochron, including data for whole-rock samples of anorthosite, metagabbro, metaperidotite, and separates of calcic plagioclase and mafic matrix from a coarse megacrystic leucogabbro, corresponds to an age of 2.86 + or - 0.05 Ga, with initial sigma(Nd) of +2.9 + or - 0.4. This implies a relatively short time interval, on the order of 70 Ma, during which anorthosite formation, tonalite emplacement, and high-grade metamorphism took place.