Forearc Variability and the Geochemical Diversity of Suprasubduction Zone Ophiolites: Insights From the Leka Ophiolite Complex, Norway

Naomi A. Becker; Wendy R. Nelson; Joseph F. Browning-Hanson; Freya R. George; James L. Crowley; Daniel R. Viete

doi:10.1029/2023GC011412

Forearc Variability and the Geochemical Diversity of Suprasubduction Zone Ophiolites: Insights From the Leka Ophiolite Complex, Norway

Naomi A. Becker
, Wendy R. Nelson
, Joseph F. Browning-Hanson
, Freya R. George
, James L. Crowley
, Daniel R. Viete

Johns Hopkins University
Towson University
University of Bristol
Boise State University

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

New whole-rock major and trace element geochemistry from the Leka Ophiolite Complex in Norway is presented and compared to the geochemical evolution and proposed tectonomagmatic processes recorded in the Izu-Bonin-Mariana system. These data demonstrate that the Leka Ophiolite Complex formed as forearc lithosphere during subduction initiation. A new high-precision zircon U-Pb date on forearc basalt constrains the timing of subduction initiation in the “Leka sector” of the Iapetus Ocean to 491.36 ± 0.17 Ma. The tectonomagmatic record of the Leka Ophiolite Complex captures only the earliest stages of subduction initiation and is thereby distinct from some other Appalachian–Caledonian ophiolites of similar age. The diversity of Appalachian–Caledonian ophiolite records may represent differing preservation and exposure of a variable forearc lithosphere.

Original language	English
Article number	e2023GC011412
Journal	Geochemistry, Geophysics, Geosystems
Volume	25
Issue number	7
DOIs	https://doi.org/10.1029/2023GC011412
State	Published - Jul 2024
Externally published	Yes

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title = "Forearc Variability and the Geochemical Diversity of Suprasubduction Zone Ophiolites: Insights From the Leka Ophiolite Complex, Norway",

abstract = "New whole-rock major and trace element geochemistry from the Leka Ophiolite Complex in Norway is presented and compared to the geochemical evolution and proposed tectonomagmatic processes recorded in the Izu-Bonin-Mariana system. These data demonstrate that the Leka Ophiolite Complex formed as forearc lithosphere during subduction initiation. A new high-precision zircon U-Pb date on forearc basalt constrains the timing of subduction initiation in the “Leka sector” of the Iapetus Ocean to 491.36 ± 0.17 Ma. The tectonomagmatic record of the Leka Ophiolite Complex captures only the earliest stages of subduction initiation and is thereby distinct from some other Appalachian–Caledonian ophiolites of similar age. The diversity of Appalachian–Caledonian ophiolite records may represent differing preservation and exposure of a variable forearc lithosphere.",

author = "Becker, \{Naomi A.\} and Nelson, \{Wendy R.\} and Browning-Hanson, \{Joseph F.\} and George, \{Freya R.\} and Crowley, \{James L.\} and Viete, \{Daniel R.\}",

note = "Publisher Copyright: {\textcopyright} 2024 The Author(s). Geochemistry, Geophysics, Geosystems published by Wiley Periodicals LLC on behalf of American Geophysical Union.",

year = "2024",

month = jul,

doi = "10.1029/2023GC011412",

language = "English",

volume = "25",

number = "7",

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T1 - Forearc Variability and the Geochemical Diversity of Suprasubduction Zone Ophiolites

T2 - Insights From the Leka Ophiolite Complex, Norway

AU - Becker, Naomi A.

AU - Nelson, Wendy R.

AU - Browning-Hanson, Joseph F.

AU - George, Freya R.

AU - Crowley, James L.

AU - Viete, Daniel R.

PY - 2024/7

Y1 - 2024/7

N2 - New whole-rock major and trace element geochemistry from the Leka Ophiolite Complex in Norway is presented and compared to the geochemical evolution and proposed tectonomagmatic processes recorded in the Izu-Bonin-Mariana system. These data demonstrate that the Leka Ophiolite Complex formed as forearc lithosphere during subduction initiation. A new high-precision zircon U-Pb date on forearc basalt constrains the timing of subduction initiation in the “Leka sector” of the Iapetus Ocean to 491.36 ± 0.17 Ma. The tectonomagmatic record of the Leka Ophiolite Complex captures only the earliest stages of subduction initiation and is thereby distinct from some other Appalachian–Caledonian ophiolites of similar age. The diversity of Appalachian–Caledonian ophiolite records may represent differing preservation and exposure of a variable forearc lithosphere.

AB - New whole-rock major and trace element geochemistry from the Leka Ophiolite Complex in Norway is presented and compared to the geochemical evolution and proposed tectonomagmatic processes recorded in the Izu-Bonin-Mariana system. These data demonstrate that the Leka Ophiolite Complex formed as forearc lithosphere during subduction initiation. A new high-precision zircon U-Pb date on forearc basalt constrains the timing of subduction initiation in the “Leka sector” of the Iapetus Ocean to 491.36 ± 0.17 Ma. The tectonomagmatic record of the Leka Ophiolite Complex captures only the earliest stages of subduction initiation and is thereby distinct from some other Appalachian–Caledonian ophiolites of similar age. The diversity of Appalachian–Caledonian ophiolite records may represent differing preservation and exposure of a variable forearc lithosphere.

UR - https://www.scopus.com/pages/publications/85198069069

U2 - 10.1029/2023GC011412

DO - 10.1029/2023GC011412

M3 - Article

AN - SCOPUS:85198069069

SN - 1525-2027

VL - 25

JO - Geochemistry, Geophysics, Geosystems

JF - Geochemistry, Geophysics, Geosystems

IS - 7

M1 - e2023GC011412

ER -

Forearc Variability and the Geochemical Diversity of Suprasubduction Zone Ophiolites: Insights From the Leka Ophiolite Complex, Norway

Abstract

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