Unknown
PANGAEA
In:
Supplement to: Quandt, Dennis; Micheuz, Peter; Kurz, Walter; Bernasconi, Stefano M; Hippler, Dorothee; Krenn, Kurt; Hauzenberger, C A (2020): Geochemistry and Microtextures of Vein Calcites Pervading the Izu‐Bonin Forearc and Rear Arc Crust: New Insights From IODP Expeditions 352 and 351. Geochemistry, Geophysics, Geosystems, 21(2), https://doi.org/10.1029/2019GC008745
Publication Date:
2023-12-01
Description:
International Ocean Discovery Program Expeditions 352 and 351 drilled into the Western Pacific Izu-Bonin forearc and rear arc. The drill cores revealed that the forearc is composed of forearc basalts (FAB) and boninites, and the rear arc consists of FAB-like rocks. These rocks are pervaded by calcite veins, which document extensive fluid circulation and secondary mineralization. Here we present two data sets with rare earth element and yttrium (REE+Y) concentrations and clumped isotopic (Δ47) compositions. Clumped isotopes reveal precipitation temperatures 〈 100 °C. REE+Y characteristics and clumped isotopic compositions indicate varying parental fluid compositions ranging from pristine seawater to variably modified seawater. The most pristine seawater signatures are recorded by FAB-hosted low-T (〈 30 °C) vein calcites with seawater-like REE+Y distribution patterns and parental fluid δ18O values within the range of seawater (-2 to +2 ‰ VSMOW). As a result of weak fluid-rock interaction and precipitation from modified seawater, boninite-hosted low-T (〈 30 °C) vein calcites show reduced Y/Ho ratios (〈 36) and less pronounced negative Ce anomalies relative to seawater. In the rear arc, intense low-T host rock alteration produced fluids with significantly depleted δ18O compositions (up to -9.7 ‰ VSMOW) and reduced Y/Ho ratios (〈 36). Vein calcites precipitated at temperatures up to 74 ± 12 °C.
Keywords:
Calcite veins; Clumped isotopes; IODP; Rare earth elements
Type:
Dataset
Format:
application/zip, 2 datasets
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