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keratophyre

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Keratophyre - Wikipedia
Keratophyre is a volcanic rock of intermediate composition. Although similar to trachyte, keratophyre's plagioclase component is richer in sodium. en.wikipedia.org
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What is keratophyre? - ScienceDirect.com
Keratophyre and the two types of quartz keratophyre are leucocratic sodic albite-phyric volcanics, the former intermediate and the latter felsic. www.sciencedirect.com
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Keratophyre: Mineral information, data and localities.
A term originally used for a quartz-bearing orthoclase-plagioclase rock with a dense groundmass, but later used for albitized felsic extrusive rocks. www.mindat.org
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keratophyre
keratophyre Petrogr. (ˈkɛrətəfaɪə(r)) [ad. G. keratophyr (C. W. Gümble Die paläolith. Eruptivgesteine des Fichtelgebirges (1874) 44), f. kerato-: see -phyre.] (See quot. 1972.)1889 Geol. Mag. Feb. 71 Microscopical examination and chemical analysis show that these rocks consist, in part at least, of ... Oxford English Dictionary
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KERATOPHYRE definition in American English - Collins Dictionary
Mineralogy a fine-grained soda trachyte.... Click for pronunciations, examples sentences, video. www.collinsdictionary.com
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What is keratophyre? - ADS
The rock names keratophyre and quartz keratophyre are beset by confusion and ambiguity. This is due in part to the notion that these sodic rock types ... ui.adsabs.harvard.edu
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[PDF] Part 2. The Matlock Keratophyre - UNI ScholarWorks
The keratophyre is comparable to rhyolite exposed in Wisconsin in terms of age, stratigraphic position, and low-grade metamorphism, although it cannot be ... scholarworks.uni.edu
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Plagiogranite and keratophyre in ophiolite on Fidalgo Island ...
The plagiogranites and keratophyres have identical chemical compositions and are mutually gradational in field setting and textures, all of ... pubs.geoscienceworld.org
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Rockblog: Quartz keratophyre - Rock, Poem, Photo
This rock is heavily altered, but it apparently was originally volcanic and shallow subvolcanic material, of a composition richer in silica than seafloor ... skinny.typepad.com
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Geology, geochemistry, and mineralisation of a spilite-keratophyre ...
These studies led to the conclusion that the characteristics of the volcanic band conform to those of a spilite-keratophyre association. The ... www.tandfonline.com
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Trondhjemite and metamorphosed quartz keratophyre tuff of the ...
Overall, however, the major- and minor-element chemistry of the trondhjemites is closely similar to that of the Ammonoosuc quartz keratophyre tuff. These rocks ... pubs.usgs.gov
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Fidalgo ophiolite
The sedimentary sequence consists of volcanic keratophyre and spilite interbedded with greywacke and argillite. wikipedia.org
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-phyre
-phyre (faɪə(r)) comb. form of porphyry used in names of porphyritic rocks, as granophyre, keratophyre. Oxford English Dictionary
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Skomer Volcanic Group
Lithology and stratigraphy The Group comprises around 1000m thickness of lava flows and associated strata including felsite, albite-trachyte, keratophyre wikipedia.org
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Trachyte
Closely allied to trachyte is the rock type called keratophyre, which is the sodium-rich-plagioclase equivalent of trachyte. wikipedia.org
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