Rapid Kimberlite Ascent and the Significance of Ar-Ar Ages in Xenolith Phlogopites

Kimberlite eruptions bring exotic rock fragments and minerals, including diamonds, from deep within the mantle up to the surface. Such fragments are rapidly absorbed into the kimberlite magma so their appearance at the surface implies rapid transport from depth. High spatial resolution Ar-Ar age dat...

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Bibliographic Details
Published in:Science
Main Authors: Kelley, S. P., Wartho, J.-A.
Format: Article in Journal/Newspaper
Language:English
Published: American Association for the Advancement of Science (AAAS) 2000
Subjects:
Kola Peninsula
Pacific
kola peninsula
Online Access:https://oceanrep.geomar.de/id/eprint/30267/
https://oceanrep.geomar.de/id/eprint/30267/1/Rapid%20Kimberlite%20Ascent.pdf
https://doi.org/10.1126/science.289.5479.609
Description
Summary:Kimberlite eruptions bring exotic rock fragments and minerals, including diamonds, from deep within the mantle up to the surface. Such fragments are rapidly absorbed into the kimberlite magma so their appearance at the surface implies rapid transport from depth. High spatial resolution Ar-Ar age data on phlogopite grains in xenoliths from Malaita in the Solomon Islands, southwest Pacific, and Elovy Island in the Kola Peninsula, Russia, indicate transport times of hours to days depending upon the magma temperature. In addition, the data show that the phlogopite grains preserve Ar-Ar ages recorded at high temperature in the mantle, 700°C above the conventional closure temperature.

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