Protolith relations of the Gravina belt and Yukon-Tanana terrane in central southeastern Alaska

W. C. McClelland, G. E. Gehrels, S. D. Samson, P. J. Patchett

Research output: Contribution to journalArticle

49 Scopus citations

Abstract

Metamorphic rocks west of the Coast Mountains batholith in central southeastern Alaska are divided into the Gravina belt, Taku terrane, and newly defined Ruth assemblage. The Ruth assemblage is similar in age and protolith to, and thus correlated with, the Yukon-Tanana terrane. The Gravina belt is characterized by upper Jurassic and lower Cretaceous mafic volcanic rocks and tuffaceous turbiditic clastic strata that unconformably overlie the Alexander terrane. Metamorphic rocks that structurally underlie the Taku terrane and Ruth assemblage are included in this assemblage. Trace element geochemistry and the abundance of pyroclastic flows associated with tuffaceous turbidites suggest that the Gravina belt evolved in an intra-arc basinal setting. -from Authors

Original languageEnglish (US)
Pages (from-to)107-123
Number of pages17
JournalJournal of Geology
Volume100
Issue number1
DOIs
StatePublished - Jan 1 1992

ASJC Scopus subject areas

  • Geology

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