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Tephrite

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Tephritic rocks, with felsics comprising 10-60% foids and alkali feldspar/total feldspar <0.1, <10% olivine.

A group of fine grained igneous rocks, generally extrusive, of basaltic character, primarily composed of calcic plagioclase, augite, and nepheline or leucite as the main feldspathoids, with accessory alkali feldspar; also, any member of that group; the extrusive equivalent of theralite. With the addition of olivine, the rock would be called a basanite.


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Classification of TephriteHide

QAPF_V_14.png

Tephrite appears in field 14 in the QAPF diagram.^TAS

Sub-divisions of TephriteHide

Age distributionHide

Recorded ages:
Cenozoic : 43.78 ± 0.57 Ma to 2.30 ± 0.54 Ma - based on 8 recorded ages.

References for TephriteHide

Reference List:
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Klaus K.E. Neuendorf, James P. Mehl, Jr., and Julia A. Jackson (Editors), 2017. Glossary of Geology. Fifth REVISED edition. American Geological Institute (abbreviated as AGI).

Internet Links for TephriteHide

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