Pulse Brain · Growing Health Evidence Index
Tier 3 — Observational / field trialPeer-reviewed

Oxygen and U-Th isotopes and the timescales of hydrothermal exchange and melting in granitoid wall rocks at Mount Mazama, Crater Lake, Oregon

Meagan E. Ankney, Charles R. Bacon, John W. Valley, Brian L. Beard, Clark M. Johnson

Geochimica et Cosmochimica Acta · 2017

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Summary

This geochemical study employs oxygen and U-Th isotope systematics in granitoid samples from Mount Mazama's magma chamber to quantify the temporal duration of hydrothermal exchange and partial melting in wall rocks. The work contributes to understanding magma chamber processes and crustal-magmatic interactions in subduction-related volcanic systems, as suggested by the isotopic signatures preserved in altered minerals.

UK applicability

This study is not directly applicable to UK agricultural, soil health, or food systems research. It addresses fundamental volcanological and geochemical processes specific to the Cascades subduction zone and has no direct relevance to farming, nutrition, or land management practice.

Key measures

Oxygen isotope ratios (δ18O), uranium-thorium (U-Th) isotope ratios, and radiometric dating constraints on hydrothermal alteration and melting timescales

Outcomes reported

The study analysed oxygen and uranium-thorium isotope ratios in granitoid samples from Mount Mazama to constrain the timescales of hydrothermal fluid exchange and partial melting processes occurring in magma chamber wall rocks.

Theme
General food systems / other
Subject
Other / interdisciplinary
Study type
Research
Study design
Laboratory / analytical study
Source type
Peer-reviewed study
Status
Published
Geography
United States
System type
Other
DOI
10.1016/j.gca.2017.04.043
Catalogue ID
BFmor3gfpg-bwhvji

Topic tags

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