Nd isotopic characteristics of metamorphic and plutonic rocks of the Coast Mountains near Prince Rupert, British Columbia

P. J. Patchett, G. E. Gehrels, C. E. Isachsen

Research output: Contribution to journalArticle

16 Scopus citations

Abstract

Nd isotopic data are presented for a suite of metamorphic and plutonic rocks from a traverse across the Coast Mountains between Terrace and Prince Rupert, British Columbia, and for three contrasting batholiths in the Omineca Belt of southern Yukon. A presumed metamorphic equivalent of Jurassic volcanic rocks of the Stikine terrane gives ε(Nd)=+6, and a number of other metaigneous and metasedimentary rocks in the core of the Coast Mountains give ε(Nd) values from +3 to +7. A single metasedimentary rock approximately 3 km east of the Work Channel shear zone gives a ε(Nd) value of -9. Coast Belt plutons in the traverse yield ε(Nd) from -1 to +2. The Omineca Belt plutons give ε(Nd) from -10 to -17. All results are consistent with published data in demonstrating that (i) juvenile origins for both igneous and metamorphic rocks are common in the Coast Belt; (ii) representatives of a continental-margin sedimentary sequence with Precambrian crustal Nd are tectonically interleaved in the Coast Mountains; (iii) Coast Mountains plutons can be interpreted as derived from a blend of metamorphic rocks like those seen at the surface, or as arc-type melts contaminated with the older crustal component; and (iv) Omineca Belt plutons are dominated by remelted Precambrian crustal rocks.

Original languageEnglish (US)
Pages (from-to)556-561
Number of pages6
JournalCanadian Journal of Earth Sciences
Volume35
Issue number5
DOIs
StatePublished - Jan 1 1998

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)

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