Tuffisites and magnetite tuffisites from Tory island, Ireland, and related products of gas action

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ID: 305823
1959
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Abstract
On Tory Island an unrecorded small swarm of saccharoidal leucocratic aplitic veins invades the "Older Granite" of Donegal. Microscopically the veins have granophyric margins; intimate shattering and penetration of the granitic country rock is accompanied by incorporation of xenoclasts of granite and neighboring metasediment. One vein is replete with magnetite grains (making it completely black in hand specimen), which crystallized between the 2 phases of intrusion of this composite aplite. Detailed structural and textural features suggest these veins are tuffisites resulting from gaseous fluidization (gas streaming). The magnetite appears to derive from decayed granitic mafics. The magnetite has cell dimension of pure Fe 3 O 4 (Curie temperature 585 + or - 5 degrees C.) and a very low Ti-content; this implies low-temperature crystallization according to Buddington, Fahey, and Vlisidis (1955), but the universal validity of their hypothesis is questioned. Evidence for very high-temperature crystallization of these tuffisites is advanced (C. F. Slieve tuffisites described by D. L. Reynolds). Xenolithic and xenoystic rocks in numerous environments, and sedimentary dikes associated with igneous dikes, are discussed in relation to positive evidence of violent gas-phase activity during intrusion processes.
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openalex_W2121954560 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors E. H. Timothy Whitten
Journal american journal of science
Year 1959
DOI
10.2475/ajs.257.2.113
URL
https://doi.org/10.2475/ajs.257.2.113
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