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

Kelley, S. P. and Wartho, J.-A. (2000) Rapid Kimberlite Ascent and the Significance of Ar-Ar Ages in Xenolith Phlogopites. Science, 289 (5479). pp. 609-611. DOI 10.1126/science.289.5479.609.

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Abstract

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.

Document Type: Article
Keywords: Kimberlite eruptions, Ar-Ar age dates; Xenolith Phlogopites; Malaita, Elovy Island
Refereed: Yes
DOI etc.: 10.1126/science.289.5479.609
ISSN: 0036-8075
Date Deposited: 24 Nov 2015 10:01
Last Modified: 24 Nov 2015 10:01
URI: http://oceanrep.geomar.de/id/eprint/30267

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