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

doi:10.1086/629574

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

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56 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 language	English (US)
Pages (from-to)	107-123
Number of pages	17
Journal	Journal of Geology
Volume	100
Issue number	1
DOIs	https://doi.org/10.1086/629574
State	Published - 1992
Externally published	Yes

ASJC Scopus subject areas

Geology

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title = "Protolith relations of the Gravina belt and Yukon-Tanana terrane in central southeastern Alaska",

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",

author = "McClelland, {W. C.} and Gehrels, {G. E.} and Samson, {S. D.} and Patchett, {P. J.}",

year = "1992",

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T1 - Protolith relations of the Gravina belt and Yukon-Tanana terrane in central southeastern Alaska

AU - McClelland, W. C.

AU - Gehrels, G. E.

AU - Samson, S. D.

AU - Patchett, P. J.

PY - 1992

Y1 - 1992

N2 - 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

AB - 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

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

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