Timescales of mixing and mobilisation in the Bishop Tuff magma body: perspectives from diffusion chronometry

We present two-feldspar thermometry and diffusion chronometry from sanidine, orthopyroxene and quartz from multiple samples of the Bishop Tuff, California, to constrain the temperature stratification within the pre-eruptive magma body and the timescales of magma mixing prior to its evacuation. Two-f...

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Bibliographic Details
Published in:Contributions to mineralogy and petrology 2014-07, Vol.168 (1), p.1, Article 1034
Main Authors: Chamberlain, Katy J., Morgan, Daniel J., Wilson, Colin J. N.
Format: Article
Language:English
Subjects:
Diffusion
Diffusion coefficient
Earth and Environmental Science
Earth Sciences
Geology
Magma
Mineral Resources
Mineralogy
Original Paper
Petrology
Quartz
Temperature measurements
Thermography
Volcanoes
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Summary:We present two-feldspar thermometry and diffusion chronometry from sanidine, orthopyroxene and quartz from multiple samples of the Bishop Tuff, California, to constrain the temperature stratification within the pre-eruptive magma body and the timescales of magma mixing prior to its evacuation. Two-feldspar thermometry yields estimates that agree well with previous Fe–Ti oxide thermometry and gives a ~80 °C temperature difference between the earlier- and later-erupted regions of the magma chamber. Using the thermometry results, we model diffusion of Ti in quartz, and Ba and Sr in sanidine as well as Fe–Mg interdiffusion in orthopyroxene to yield timescales for the formation of overgrowth rims on these crystal phases. Diffusion profiles of Ti in quartz and Fe–Mg in orthopyroxene both yield timescales of
ISSN:0010-7999
1432-0967
DOI:10.1007/s00410-014-1034-2