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- W2331557079 abstract "Rocks with δ^(18)O values of less than 5‰ SMOW (Standard Mean Ocean Water) contain oxygen derived from ∼0‰ seawater or meteoric (rain or melted snow, <0‰) waters. As δ^(18)O_(precipitation) values decrease with increasing latitude, altitude, and toward the interior of continents, the low δ^(18)O values (<5‰) of hydrothermally altered rocks can potentially serve as a proxy for the δ^(18)O values of the altering water and as a proxy for climates (Fig. 1). Hydrothermal exchange of rocks with large quantities of meteoric waters presents the most viable opportunity to imprint low-δ^(18)O water values on the protolith (Fig. 2). Such processes typically require shallow depths of a few kilometers (where water circulates through open cracks and porous rocks), a heat source to drive meteoric-hydrothermal systems, and appropriate hydrogeologic conditions for water refill. These conditions are most commonly found in caldera and rift settings, such as in Yellowstone (Wyoming, United States) and Iceland. Oxygen—as the major element—is not significantly affected by subsequent metamorphism and melting (by more than ~1 ‰), and metamorphism often creates large, refractory metamorphic minerals (garnets, omphacites, zircons) that lock the protolith's oxygen isotopic values permanently in the geologic record." @default.
- W2331557079 created "2016-06-24" @default.
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- W2331557079 date "2011-08-01" @default.
- W2331557079 modified "2023-10-17" @default.
- W2331557079 title "When do we need pan-global freeze to explain 18O-depleted zircons and rocks?" @default.
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- W2331557079 doi "https://doi.org/10.1130/focus082011.1" @default.
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