The New Encyclopaedia Britannica, Volume 9Encyclopaedia Britannica, 1974 - Encyclopedias and dictionaries |
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Page 207
... plagioclase . Representatives of clan unknown or extremely rare . kinds of intrusive breccias . Pyroclastic rocks Ionic con- stituents Viscosity of magmas Magmatic tempera-. Table 7 : General Megascopic Classification of Igneous Rocks ...
... plagioclase . Representatives of clan unknown or extremely rare . kinds of intrusive breccias . Pyroclastic rocks Ionic con- stituents Viscosity of magmas Magmatic tempera-. Table 7 : General Megascopic Classification of Igneous Rocks ...
Page 221
... plagioclase total feldspar anorthite in plagioclase Gabbroic rocks Gabbro ( diabase , basalt ) 10-90 Diorite ( andesite ) 10-90 Anorthosite 0-10 0-10 90-100 0-10 90-100 0-10 90-100 50-100 0-50 Quartz diorite ( quartz andesite ) 0-90 10 ...
... plagioclase total feldspar anorthite in plagioclase Gabbroic rocks Gabbro ( diabase , basalt ) 10-90 Diorite ( andesite ) 10-90 Anorthosite 0-10 0-10 90-100 0-10 90-100 0-10 90-100 50-100 0-50 Quartz diorite ( quartz andesite ) 0-90 10 ...
Page 222
... plagioclase . In many exam- ples of diorite , amphibole takes the place of pyroxene , and the texture , even if the major minerals are plagio- clase and pyroxene , is not the same as the typical texture of gabbro . In diorite , the ...
... plagioclase . In many exam- ples of diorite , amphibole takes the place of pyroxene , and the texture , even if the major minerals are plagio- clase and pyroxene , is not the same as the typical texture of gabbro . In diorite , the ...
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Antarctic antibodies antigen atoms basalt basin bonds carbon cause cells centimetres central centre century chemical composition crystals cultural cycle cyclone earth economic effect eruption evaporation feet feldspar feldspathoids flow freezing gabbro glaciers groundwater humidity Hungarian Hungary hunting hydrocarbons hydrogen hydrograph hydrologic hydrologic cycle hypnosis ice sheets icebergs Iceland ideology igneous rocks Illinois immunoglobulin immunological important increase India industry intrusive kilometres king known lakes land lava layers liquid lymphocytes mafic magma major melting ment metres miles millimetres minerals molecules mountain natural North northern occur ocean parasitic percent philosophy plagioclase political population precipitation pressure produced rainfall reaction region relatively result Reykjavík river runoff Samkhya snow social soil square kilometres square miles structure surface temperature theory tion ture types United vapour volcanic western wind zone