Whole-rock chemical and Nd isotopic composition of a Late Proterozoic metasedimentary sequence in Ganderia: Kellys Mountain, Bras d’Or terrane,Nova Scotia, Canada

Atlantic Geology

Sandra M. Barr²  Chris E White³  David McMullin⁴  Christian Pin¹ 

[1] Université Blaise Pascal, 5 rue Kessler 63 038 Clermont-Ferrand Cedex, FRANCE;Acadia University, Wolfville, NS;Department of Natural Resources, P.O. Box 698, Halifax, NS, CANADA B3J 2T9;Acadia University

关键词: Ganderia;    paragneiss;    Nd isotopes;    sedimentary geochemistry;   

DOI  :  

学科分类：地质学

来源: Atlantic Geoscience Society

【 摘 要 】

The relationship between low-grade metasedimentary and high-grade paragneissic Precambrian rock units in the Bras d’Or terrane of central CapeBreton Island is a long-standing geological problem. Whole-rock geochemical and Nd isotopic data from representative components of these units in the Kellys Mountain area, the Glen Tosh formation and Kellys Mountain Gneiss, show strong similarity. Major and trace element characteristics suggest that protolith sediments for both units were wackes derived from felsic igneous sources and deposited at an active continental margin. Neodymium isotopic data in combination with previously published detrital zircon ages show that the sediments contained an ancient (ca. 2 Ga) end-member of recycled continental crust mixed with a juvenile component of Late Neoproterozoic age.  The similarities suggest that the rocks represent the same sedimentary unit at different grades of metamorphism.

【 授权许可】

Unknown