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Kaersutite - a product of reaction between pargasite and basanite at Dish Hill, California

Earth and Planetary Science Letters

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Abstract

Paragasitic amphibole, occurring interstitially and as veins in peridotite inclusions in basanite, has reacted with the host basanite to form kaersutitic amphibole. The amphibole compositions vary with respect to distance from the edge of the xenolith; iron, titanium, and potassium contents are higher and magnesium, silicon, sodium, and chromium contents are lower closer to the basanite. Pargasite was exposed to the basanite when peridotite blocks broke open along amphibole veins during transport to the surface. Small amphibole fragments isolated in the basanite show the most reaction; compositional gradients in interstitial and vein amphibole are steep into peridotite inclusions where the amphibole was shielded from reaction. The compositions of amphiboles so modified have no direct bearing on high pressure fractionation trends if the amphibole is cognate, or on the bulk composition of the upper mantle if it is accidental. ?? 1971.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Kaersutite - a product of reaction between pargasite and basanite at Dish Hill, California
Series title:
Earth and Planetary Science Letters
Volume
10
Issue:
2
Year Published:
1971
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Earth and Planetary Science Letters
First page:
281
Last page:
284
Number of Pages:
4