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Перевод: hornblende

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роговая обманка

Тезаурус:

1. The quartzo-feldspathic gneiss contains quartz, feldspar and hornblende as the principal minerals, variable though small amounts of biotite, and with iron ores and apatite as the common accessory minerals present.
2. The amphibolite bands and lenses are more or less biminerallic, with hornblende by far the most abundant mineral, often occupying more than 75 per cent of the rock, and with feldspar as the other mineral present.
3. In general, the gneiss is quartz-rich but variable in character, and with hornblende patches and acid veins occasionally present.
4. The thermal history of the South Mountains Granodiorite, provided by isotopic (U-Pb zircon, 40 Ar/ 39 Ar hornblende, K-Ar biotite) and fission-track (apatite) age determinations, indicates rapid cooling of 260CMyr -1 (from 800 to 300C) between 22 and 20Myr ago, followed by slower cooling of 73CMyr -1 (from 300 to 100C) between 20 and 17Myr (ref. 24).
5. It would in any case be difficult to derive the high Sr/Y, La/Yb ratios and low Y and HREE contents of these magmas by fractional crystallization of the main phases present in the rocks: plagioclase, hornblende and clino- pyroxene.
6. The hornblende gneiss is similar in character and mineralogy, but hornblende is invariably the most abundant mineral present.
7. This comprises either quartzo-feldspathic gneiss or hornblende gneiss, often with intercalated amphibolite sheets.
8. Mineral assemblage: clinopyroxene, orthopyroxene, plagioclase, spinels, hornblende
9. According to Joly, basalt, obsidian, orthoclase felspar and hornblende weather three to fourteen times more rapidly in salt water than in fresh.