Publication Date:
2019-07-12
Description:
Compositionally diverse Late Archean rocks (2.74-2.79 Ga old) from the eastern Beartooth Mountains (Montana and Wyoming) were studied and shown to have the same initial Pb, Sr, and Nd isotopic ratios. Lead and Sr initial ratios are higher and Nd initial values lower than predicted for rocks derived from model mantle sources and strongly indicate the involvement of an older crustal reservoir in the genesis of these rocks. A model involving subduction of continental detritus and contamination of the overlying mantle is suggested.
Keywords:
GEOPHYSICS
Type:
Earth and Planetary Science Letters (ISSN 0012-821X); 87; 1-2; 59-72
Format:
text
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