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

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

Research output: Contribution to journalArticle

16 Citations (Scopus)

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
StatePublished - 1998

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plutonic rock
metamorphic rock
pluton
mountain
coast
metasedimentary rock
Precambrian
metaigneous rock
sedimentary sequence
igneous rock
terrace
shear zone
continental margin
terrane
volcanic rock
Jurassic
melt
rock

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)

Cite this

Nd isotopic characteristics of metamorphic and plutonic rocks of the Coast Mountains near Prince Rupert, British Columbia. / Patchett, P. J.; Gehrels, George E; Isachsen, C. E.

In: Canadian Journal of Earth Sciences, Vol. 35, No. 5, 1998, p. 556-561.

Research output: Contribution to journalArticle

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