Stratigraphic and Geochemical Evolution of an arc upper crustal section; the Jurassic Talkeetna Volcanic Formation, South Central Alaska

Peter Dominic Clift, A. E. Draut, P. B. Kelemen, J. Blusztajn, A. R. Greene

Research output: Contribution to journalArticle

50 Citations (Scopus)

Abstract

The Early Jurassic Talkeetna Volcanic Formation forms the upper stratigraphic level of an oceanic volcanic are complex within the Peninsular Terrane of south-central Alaska. The section comprises a series of lavas, tuffs, and volcaniclastic debris-flow and turbidite deposits, showing significant lateral facies variability. There is a general trend toward more volcaniclastic sediment at the top of the section and more lavas and tuff breccias toward the base. Evidence for dominant submarine, mostly mid-bathyal or deeper (> 500 m) emplacement is seen throughout the section, which totals similar to 7 km in thickness, similar to modern western Pacific arcs, and far more than any other known exposed section. Subaerial sedimentation was rare but occurred over short intervals in the middle of the section. The Talkeetna Volcanic Formation is dominantly calc-alkaline and shows no clear trend to increasing SiO2 up-section. An oceanic subduction petrogenesis is shown by trace element and Nd isotope data. Rocks at the base of the section show no relative enrichment of light rare earth elements (LREEs) versus heavy rare earth elements (RFEs) or in meltincompatible versus compatible high field strength elements (HFSEs). Relative enrichment of LREEs and HFSEs increases slightly up-section. The Talkeetna Volcanic Formation is typically more REE depleted than average continental crust, although small volumes of light REE-enriched and heavy REE-depleted mafic lavas are recognized low in the stratigraphy. The Talkeetna Volcanic Formation was formed in an intraoceanic arc above a north-dipping subduction zone and contains no preserved record of its subsequent collisions with Wrangellia or North America.

Original languageEnglish
Pages (from-to)902-925
Number of pages23
JournalGeological Society of America Bulletin
Volume117
Issue number7/8
DOIs
Publication statusPublished - 2005

Keywords

  • sedimentology
  • arc volcanism
  • subduction
  • geochemistry
  • isotope geology
  • RANGES FAULT SYSTEM
  • ISLAND-ARC
  • CONTINENTAL-CRUST
  • CHUGACH MOUNTAINS
  • NORTHERN PAKISTAN
  • LADAKH-HIMALAYA
  • MARIANA TROUGH
  • KOHISTAN ARC
  • TEMPORAL EVOLUTION
  • MAGMATIC EVOLUTION

Cite this

Stratigraphic and Geochemical Evolution of an arc upper crustal section; the Jurassic Talkeetna Volcanic Formation, South Central Alaska. / Clift, Peter Dominic; Draut, A. E.; Kelemen, P. B.; Blusztajn, J.; Greene, A. R.

In: Geological Society of America Bulletin, Vol. 117, No. 7/8, 2005, p. 902-925.

Research output: Contribution to journalArticle

Clift, Peter Dominic ; Draut, A. E. ; Kelemen, P. B. ; Blusztajn, J. ; Greene, A. R. / Stratigraphic and Geochemical Evolution of an arc upper crustal section; the Jurassic Talkeetna Volcanic Formation, South Central Alaska. In: Geological Society of America Bulletin. 2005 ; Vol. 117, No. 7/8. pp. 902-925.
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T1 - Stratigraphic and Geochemical Evolution of an arc upper crustal section; the Jurassic Talkeetna Volcanic Formation, South Central Alaska

AU - Clift, Peter Dominic

AU - Draut, A. E.

AU - Kelemen, P. B.

AU - Blusztajn, J.

AU - Greene, A. R.

PY - 2005

Y1 - 2005

N2 - The Early Jurassic Talkeetna Volcanic Formation forms the upper stratigraphic level of an oceanic volcanic are complex within the Peninsular Terrane of south-central Alaska. The section comprises a series of lavas, tuffs, and volcaniclastic debris-flow and turbidite deposits, showing significant lateral facies variability. There is a general trend toward more volcaniclastic sediment at the top of the section and more lavas and tuff breccias toward the base. Evidence for dominant submarine, mostly mid-bathyal or deeper (> 500 m) emplacement is seen throughout the section, which totals similar to 7 km in thickness, similar to modern western Pacific arcs, and far more than any other known exposed section. Subaerial sedimentation was rare but occurred over short intervals in the middle of the section. The Talkeetna Volcanic Formation is dominantly calc-alkaline and shows no clear trend to increasing SiO2 up-section. An oceanic subduction petrogenesis is shown by trace element and Nd isotope data. Rocks at the base of the section show no relative enrichment of light rare earth elements (LREEs) versus heavy rare earth elements (RFEs) or in meltincompatible versus compatible high field strength elements (HFSEs). Relative enrichment of LREEs and HFSEs increases slightly up-section. The Talkeetna Volcanic Formation is typically more REE depleted than average continental crust, although small volumes of light REE-enriched and heavy REE-depleted mafic lavas are recognized low in the stratigraphy. The Talkeetna Volcanic Formation was formed in an intraoceanic arc above a north-dipping subduction zone and contains no preserved record of its subsequent collisions with Wrangellia or North America.

AB - The Early Jurassic Talkeetna Volcanic Formation forms the upper stratigraphic level of an oceanic volcanic are complex within the Peninsular Terrane of south-central Alaska. The section comprises a series of lavas, tuffs, and volcaniclastic debris-flow and turbidite deposits, showing significant lateral facies variability. There is a general trend toward more volcaniclastic sediment at the top of the section and more lavas and tuff breccias toward the base. Evidence for dominant submarine, mostly mid-bathyal or deeper (> 500 m) emplacement is seen throughout the section, which totals similar to 7 km in thickness, similar to modern western Pacific arcs, and far more than any other known exposed section. Subaerial sedimentation was rare but occurred over short intervals in the middle of the section. The Talkeetna Volcanic Formation is dominantly calc-alkaline and shows no clear trend to increasing SiO2 up-section. An oceanic subduction petrogenesis is shown by trace element and Nd isotope data. Rocks at the base of the section show no relative enrichment of light rare earth elements (LREEs) versus heavy rare earth elements (RFEs) or in meltincompatible versus compatible high field strength elements (HFSEs). Relative enrichment of LREEs and HFSEs increases slightly up-section. The Talkeetna Volcanic Formation is typically more REE depleted than average continental crust, although small volumes of light REE-enriched and heavy REE-depleted mafic lavas are recognized low in the stratigraphy. The Talkeetna Volcanic Formation was formed in an intraoceanic arc above a north-dipping subduction zone and contains no preserved record of its subsequent collisions with Wrangellia or North America.

KW - sedimentology

KW - arc volcanism

KW - subduction

KW - geochemistry

KW - isotope geology

KW - RANGES FAULT SYSTEM

KW - ISLAND-ARC

KW - CONTINENTAL-CRUST

KW - CHUGACH MOUNTAINS

KW - NORTHERN PAKISTAN

KW - LADAKH-HIMALAYA

KW - MARIANA TROUGH

KW - KOHISTAN ARC

KW - TEMPORAL EVOLUTION

KW - MAGMATIC EVOLUTION

U2 - 10.1130/B25638.1

DO - 10.1130/B25638.1

M3 - Article

VL - 117

SP - 902

EP - 925

JO - Geological Society of America Bulletin

JF - Geological Society of America Bulletin

SN - 0016-7606

IS - 7/8

ER -