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

IF 2.9 2区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Geochemistry Geophysics Geosystems Pub Date : 2024-07-11 DOI:10.1029/2023GC011412

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

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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.

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前弧变异性与超俯冲带蛇绿岩的地球化学多样性：挪威莱卡蛇绿岩群的启示

本文介绍了挪威莱卡蛇绿混杂岩的新的全岩主要元素和痕量元素地球化学，并将其与伊豆-波宁-马里亚纳系统记录的地球化学演变和拟议的构造地质过程进行了比较。这些数据表明，Leka蛇绿岩群是在俯冲起始阶段作为前弧岩石圈形成的。弧前玄武岩的一个新的高精度锆石U-Pb日期将伊佩图斯洋 "Leka区 "的俯冲起始时间限定为491.36 ± 0.17 Ma。莱卡蛇绿岩群的构造地质记录只捕捉到了俯冲起始的最早期阶段，因此有别于其他一些年龄相近的阿巴拉契亚-卡里多尼亚蛇绿岩。阿巴拉契亚-卡勒东蛇绿岩记录的多样性可能代表了不同的弧前岩石圈的保存和暴露情况。

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来源期刊

Geochemistry Geophysics Geosystems 地学-地球化学与地球物理

CiteScore

5.90

自引率

11.40%

发文量

252

审稿时长

1 months

期刊介绍： Geochemistry, Geophysics, Geosystems (G3) publishes research papers on Earth and planetary processes with a focus on understanding the Earth as a system. Observational, experimental, and theoretical investigations of the solid Earth, hydrosphere, atmosphere, biosphere, and solar system at all spatial and temporal scales are welcome. Articles should be of broad interest, and interdisciplinary approaches are encouraged. Areas of interest for this peer-reviewed journal include, but are not limited to: The physics and chemistry of the Earth, including its structure, composition, physical properties, dynamics, and evolution Principles and applications of geochemical proxies to studies of Earth history The physical properties, composition, and temporal evolution of the Earth''s major reservoirs and the coupling between them The dynamics of geochemical and biogeochemical cycles at all spatial and temporal scales Physical and cosmochemical constraints on the composition, origin, and evolution of the Earth and other terrestrial planets The chemistry and physics of solar system materials that are relevant to the formation, evolution, and current state of the Earth and the planets Advances in modeling, observation, and experimentation that are of widespread interest in the geosciences.