Contrasting tectono-stratigraphy and structure in the Coast Belt near Chilko Lake, British Columbia

unrelated terranes or an arc/back-arc transect?

Paul J Umhoefer, M. E. Rusmore, G. J. Woodsworth

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Stratigraphy and structural styles vary greatly in two areas of the Coast Belt near Chilko Lake (Chilcotin Ranges in the east and Coast Mountains in the west). No definite continuity between the two belts has been established in the pre-mid-Cretaceous geology, but this area may be a long-lived, episodic magmatic arc and nearby arc-related basin. The stratigraphic contrasts may reflect inherent differences between an arc and related basinal sequence. Triassic volcanic-arc sequences are part of the Stikine (western belt) and Cadwallader (eastern belt) terranes, which may be part of the same arc. Lower Cretaceous sequences in the west and east may represent a volcanic arc and back-arc basin. The Taylor Creek Group (Albian) is the first definitive link between the two belts and represents an arc and intra-arc or back-arc basin. The structural evolution of the two belts also differs significantly. The differences were most likely caused by the Late Cretaceous change from nearly orthogonal subduction to a dextral-oblique convergent margin. -from Authors

Original languageEnglish (US)
Pages (from-to)1700-1713
Number of pages14
JournalCanadian Journal of Earth Sciences
Volume31
Issue number11
StatePublished - 1994
Externally publishedYes

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terrane
stratigraphy
transect
coast
lake
Cretaceous
island arc
basin
convergent margin
Triassic
subduction
geology
mountain

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)

Cite this

Contrasting tectono-stratigraphy and structure in the Coast Belt near Chilko Lake, British Columbia : unrelated terranes or an arc/back-arc transect? / Umhoefer, Paul J; Rusmore, M. E.; Woodsworth, G. J.

In: Canadian Journal of Earth Sciences, Vol. 31, No. 11, 1994, p. 1700-1713.

Research output: Contribution to journalArticle

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