Titanochondrodite and titanoclinohumite derived from the upper mantle in the Buell Park Kimberlite,Arizona, USA |
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| Authors: | Ken-ichiro Aoki Kiyoshi Fujino Masaki Akaogi |
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| Institution: | (1) Institute of Mineralogy, Petrology and Economic Geology, Tohoku University, 980 Senday, Japan;(2) Mineralogical Institute, University of Tokyo, 113 Tokyo, Japan;(3) Institute for Solid State Physics, University of Tokyo, 106 Tokyo, Japan |
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| Abstract: | Kimberlite from Buell Park, Arizona, which was intruded into Permian sediments about 30 m.y. ago, is characterized by the hydrous silicates titanochondrodite and titanoclinohumite. Titanochondrodite is the first finding in kimberlites. Optical properties, chemical compositions and cell dimensions of these two minerals are determined.Titanochondrodite and titanoclinohumite are considered to crystallize from kimberlite magma at a depth of about 100 km and at 1,000° C, on the basis of kimberlite mineralogy, petrography and high pressure experimental work. Although there is no direct evidence, the importance of these two minerals in peridotite wedges above sinking lithosphere at the continental margins is also discussed. |
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