Pressures and Depths of Crystallization of the FAMOUS Region Magmas
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Date
2012-12
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Publisher
The Ohio State University
Abstract
The FAMOUS region is between the Mid-Atlantic Ridge and the rift valley
which is < 3,000-21,000 ±6,000 years old. This study used analyses of basalt
glass from the FAMOUS region. The depth of crystallization is calculated from
estimated pressures. To do so we filtered the data by removing any glasses with
anomalous chemical compositions or samples that had estimated pressures
that were obviously incorrect. The results for 65 glasses indicate that FAMOUS
region magmas crystallize over a relatively wide range of pressures from 0 -
228.5MPa, corresponding to depths of 0-8.04 km with an average of 1.42km.
Information of the depths of chambers and pressures of crystallization is
important for understanding magma evolution, magma plumbing systems, and
predicting volcanic activity.
Description
Keywords
French American Midocean Undersea Study, Magma Chambers, Mid-Ocean Ridge, FAMOUS region