俯冲带变质过程中的钼同位素行为

IF 4.5 1区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Geochimica et Cosmochimica Acta Pub Date : 2024-10-19 DOI:10.1016/j.gca.2024.10.016

Cassidy J. Stegner, Richard M. Gaschnig, Samuel Marshall, Shelby T. Rader, Gray E. Bebout, Sarah C. Penniston-Dorland

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引用次数: 0

摘要

许多现代弧系和大陆上地壳的钼（Mo）同位素组成（定义为相对于 NIST-3134 测得的每密耳的δ98Mo）比地幔和大多数俯冲板岩重。根据这一观察结果，我们提出了一个模型，即离开板块的流体将同位素重的钼优先转移到地幔楔中，使残留板块的同位素较轻。我们通过对加利福尼亚州卡塔利娜片岩的变质岩和混合岩岩性进行钼同位素研究，对这一模型进行了探索。这些岩石记录了俯冲带在高压/中低温条件下的广泛变质作用。

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Molybdenum isotope behavior during subduction zone metamorphism

The molybdenum (Mo) isotope composition (defined as δ98Mo measured per mil relative to NIST-3134) of many modern arc systems and the upper continental crust is heavier than the mantle and most subducting slab lithologies. This observation has led to a model whereby fluids leaving the slab transfer isotopically heavy Mo preferentially to the mantle wedge, leaving the residual slab isotopically lighter. We explore this model via an Mo isotope study of the metasedimentary and mélange lithologies of the Catalina Schist in California. These rocks record subduction zone metamorphism over a wide range of high-pressure/low-to-medium temperature conditions.

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来源期刊

Geochimica et Cosmochimica Acta 地学-地球化学与地球物理

CiteScore

9.60

自引率

14.00%

发文量

437

审稿时长

6 months

期刊介绍： Geochimica et Cosmochimica Acta publishes research papers in a wide range of subjects in terrestrial geochemistry, meteoritics, and planetary geochemistry. The scope of the journal includes: 1). Physical chemistry of gases, aqueous solutions, glasses, and crystalline solids 2). Igneous and metamorphic petrology 3). Chemical processes in the atmosphere, hydrosphere, biosphere, and lithosphere of the Earth 4). Organic geochemistry 5). Isotope geochemistry 6). Meteoritics and meteorite impacts 7). Lunar science; and 8). Planetary geochemistry.