U–Pb and Hf isotopic analyses of detrital zircons from the Taku terrane, southeast Alaska

Dominique Giesler, George E Gehrels, Mark Pecha, Chelsi White, Intan Yokelson, William C. McClelland

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The Taku terrane consists of metamorphosed Carboniferous through Triassic marine clastic strata, volcanic rocks, and limestone that occur along the western margin of the Coast Mountains in southeastern Alaska. These rocks are juxtaposed along mid-Cretaceous thrust faults over Jura-Cretaceous basinal strata of the Gravina belt to the west and beneath Proterozoic through Carboniferous metamorphic rocks of the Yukon–Tanana terrane to the east. This paper presents U–Pb ages and Hf isotope analyses of detrital zircons from the Taku terrane, and compares these values with information from the adjacent Wrangellia, Alexander, and northern and southern portions of the Yukon–Tanana terrane (YTTn and YTTs). These comparisons suggest that (i) Carboniferous strata of the Taku terrane were shed mainly from mid-Paleozoic igneous rocks of YTTs, (ii) Permian strata of the Taku terrane were shed from mid-Paleozoic igneous rocks and intraformational Lower Permian volcanic rocks of YTTs as well as Upper Permian volcanic rocks exposed in YTTn, and (iii) Triassic sandstones were shed from mid-Paleozoic igneous rocks of YTTs, whereas conglomerates were shed mainly from mid-Paleozoic arc rocks in YTTn. Hf isotope analyses of Paleozoic zircons record increasing continental input during Silurian–Devonian and Permian phases of magmatism. Similarities in isotopic characteristics, combined with stratigraphic and geochemical information presented by previous workers, suggest that strata of the Taku terrane accumulated on (and partly as lateral equivalents of) rocks of YTTs, and that the combined assemblages formed outboard or along strike of YTTn.

Original languageEnglish (US)
Pages (from-to)979-992
Number of pages14
JournalCanadian Journal of Earth Sciences
Volume53
Issue number10
DOIs
StatePublished - May 25 2016

Fingerprint

terrane
zircon
Paleozoic
Permian
igneous rock
volcanic rock
Triassic
isotope
rock
Cretaceous
thrust fault
metamorphic rock
conglomerate
magmatism
Proterozoic
limestone
sandstone
mountain
coast

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)

Cite this

U–Pb and Hf isotopic analyses of detrital zircons from the Taku terrane, southeast Alaska. / Giesler, Dominique; Gehrels, George E; Pecha, Mark; White, Chelsi; Yokelson, Intan; McClelland, William C.

In: Canadian Journal of Earth Sciences, Vol. 53, No. 10, 25.05.2016, p. 979-992.

Research output: Contribution to journalArticle

Giesler, Dominique ; Gehrels, George E ; Pecha, Mark ; White, Chelsi ; Yokelson, Intan ; McClelland, William C. / U–Pb and Hf isotopic analyses of detrital zircons from the Taku terrane, southeast Alaska. In: Canadian Journal of Earth Sciences. 2016 ; Vol. 53, No. 10. pp. 979-992.
@article{803fff6f74fb489c9122da0fdabfc0db,
title = "U–Pb and Hf isotopic analyses of detrital zircons from the Taku terrane, southeast Alaska",
abstract = "The Taku terrane consists of metamorphosed Carboniferous through Triassic marine clastic strata, volcanic rocks, and limestone that occur along the western margin of the Coast Mountains in southeastern Alaska. These rocks are juxtaposed along mid-Cretaceous thrust faults over Jura-Cretaceous basinal strata of the Gravina belt to the west and beneath Proterozoic through Carboniferous metamorphic rocks of the Yukon–Tanana terrane to the east. This paper presents U–Pb ages and Hf isotope analyses of detrital zircons from the Taku terrane, and compares these values with information from the adjacent Wrangellia, Alexander, and northern and southern portions of the Yukon–Tanana terrane (YTTn and YTTs). These comparisons suggest that (i) Carboniferous strata of the Taku terrane were shed mainly from mid-Paleozoic igneous rocks of YTTs, (ii) Permian strata of the Taku terrane were shed from mid-Paleozoic igneous rocks and intraformational Lower Permian volcanic rocks of YTTs as well as Upper Permian volcanic rocks exposed in YTTn, and (iii) Triassic sandstones were shed from mid-Paleozoic igneous rocks of YTTs, whereas conglomerates were shed mainly from mid-Paleozoic arc rocks in YTTn. Hf isotope analyses of Paleozoic zircons record increasing continental input during Silurian–Devonian and Permian phases of magmatism. Similarities in isotopic characteristics, combined with stratigraphic and geochemical information presented by previous workers, suggest that strata of the Taku terrane accumulated on (and partly as lateral equivalents of) rocks of YTTs, and that the combined assemblages formed outboard or along strike of YTTn.",
author = "Dominique Giesler and Gehrels, {George E} and Mark Pecha and Chelsi White and Intan Yokelson and McClelland, {William C.}",
year = "2016",
month = "5",
day = "25",
doi = "10.1139/cjes-2015-0240",
language = "English (US)",
volume = "53",
pages = "979--992",
journal = "Canadian Journal of Earth Sciences",
issn = "0008-4077",
publisher = "National Research Council of Canada",
number = "10",

}

TY - JOUR

T1 - U–Pb and Hf isotopic analyses of detrital zircons from the Taku terrane, southeast Alaska

AU - Giesler, Dominique

AU - Gehrels, George E

AU - Pecha, Mark

AU - White, Chelsi

AU - Yokelson, Intan

AU - McClelland, William C.

PY - 2016/5/25

Y1 - 2016/5/25

N2 - The Taku terrane consists of metamorphosed Carboniferous through Triassic marine clastic strata, volcanic rocks, and limestone that occur along the western margin of the Coast Mountains in southeastern Alaska. These rocks are juxtaposed along mid-Cretaceous thrust faults over Jura-Cretaceous basinal strata of the Gravina belt to the west and beneath Proterozoic through Carboniferous metamorphic rocks of the Yukon–Tanana terrane to the east. This paper presents U–Pb ages and Hf isotope analyses of detrital zircons from the Taku terrane, and compares these values with information from the adjacent Wrangellia, Alexander, and northern and southern portions of the Yukon–Tanana terrane (YTTn and YTTs). These comparisons suggest that (i) Carboniferous strata of the Taku terrane were shed mainly from mid-Paleozoic igneous rocks of YTTs, (ii) Permian strata of the Taku terrane were shed from mid-Paleozoic igneous rocks and intraformational Lower Permian volcanic rocks of YTTs as well as Upper Permian volcanic rocks exposed in YTTn, and (iii) Triassic sandstones were shed from mid-Paleozoic igneous rocks of YTTs, whereas conglomerates were shed mainly from mid-Paleozoic arc rocks in YTTn. Hf isotope analyses of Paleozoic zircons record increasing continental input during Silurian–Devonian and Permian phases of magmatism. Similarities in isotopic characteristics, combined with stratigraphic and geochemical information presented by previous workers, suggest that strata of the Taku terrane accumulated on (and partly as lateral equivalents of) rocks of YTTs, and that the combined assemblages formed outboard or along strike of YTTn.

AB - The Taku terrane consists of metamorphosed Carboniferous through Triassic marine clastic strata, volcanic rocks, and limestone that occur along the western margin of the Coast Mountains in southeastern Alaska. These rocks are juxtaposed along mid-Cretaceous thrust faults over Jura-Cretaceous basinal strata of the Gravina belt to the west and beneath Proterozoic through Carboniferous metamorphic rocks of the Yukon–Tanana terrane to the east. This paper presents U–Pb ages and Hf isotope analyses of detrital zircons from the Taku terrane, and compares these values with information from the adjacent Wrangellia, Alexander, and northern and southern portions of the Yukon–Tanana terrane (YTTn and YTTs). These comparisons suggest that (i) Carboniferous strata of the Taku terrane were shed mainly from mid-Paleozoic igneous rocks of YTTs, (ii) Permian strata of the Taku terrane were shed from mid-Paleozoic igneous rocks and intraformational Lower Permian volcanic rocks of YTTs as well as Upper Permian volcanic rocks exposed in YTTn, and (iii) Triassic sandstones were shed from mid-Paleozoic igneous rocks of YTTs, whereas conglomerates were shed mainly from mid-Paleozoic arc rocks in YTTn. Hf isotope analyses of Paleozoic zircons record increasing continental input during Silurian–Devonian and Permian phases of magmatism. Similarities in isotopic characteristics, combined with stratigraphic and geochemical information presented by previous workers, suggest that strata of the Taku terrane accumulated on (and partly as lateral equivalents of) rocks of YTTs, and that the combined assemblages formed outboard or along strike of YTTn.

UR - http://www.scopus.com/inward/record.url?scp=84990217316&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84990217316&partnerID=8YFLogxK

U2 - 10.1139/cjes-2015-0240

DO - 10.1139/cjes-2015-0240

M3 - Article

AN - SCOPUS:84990217316

VL - 53

SP - 979

EP - 992

JO - Canadian Journal of Earth Sciences

JF - Canadian Journal of Earth Sciences

SN - 0008-4077

IS - 10

ER -