The Nomenclature of Petrology: With References to Selected LiteratureThomas Murby & Company, 1920 - 284 páginas |
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Página 14
... volcanic ash or dust . The extent of departure from current nomenclature is unnecessarily wide , and it seems doubtful whether such innovations will ever be recognised by adoption . Grabau's use of the terms . exogenetic and endogenetic ...
... volcanic ash or dust . The extent of departure from current nomenclature is unnecessarily wide , and it seems doubtful whether such innovations will ever be recognised by adoption . Grabau's use of the terms . exogenetic and endogenetic ...
Página 29
... volcanic and occasionally of intrusive rocks , which have become filled with secretionary products ( usually of late - magmatic origin ) , such as zeolites , chlorite , fórms of silica and calcite . The form amygdule is a diminutive of ...
... volcanic and occasionally of intrusive rocks , which have become filled with secretionary products ( usually of late - magmatic origin ) , such as zeolites , chlorite , fórms of silica and calcite . The form amygdule is a diminutive of ...
Página 31
... composed almost entirely of andesine . Andesite , Von Buch , 1826. - A volcanic rock , gener- ally porphyritic , composed essentially of plagioclase -- ( andesine or oligoclase , or having an average com- THE NOMENCLATURE OF PETROLOGY 31.
... composed almost entirely of andesine . Andesite , Von Buch , 1826. - A volcanic rock , gener- ally porphyritic , composed essentially of plagioclase -- ( andesine or oligoclase , or having an average com- THE NOMENCLATURE OF PETROLOGY 31.
Página 34
... volcanic rocks to indicate that they have suffered devitrification , e.g. , aporhyolite . Van Hise proposed aposandstone for quartzite , apogrit for grauwacke , and other analogous terms . F. Bascom : Journ . Geol . , i , 1893 , p . 828 ...
... volcanic rocks to indicate that they have suffered devitrification , e.g. , aporhyolite . Van Hise proposed aposandstone for quartzite , apogrit for grauwacke , and other analogous terms . F. Bascom : Journ . Geol . , i , 1893 , p . 828 ...
Página 36
... Volcanic . - Fine - grained pyroclastic material composed of comminuted glass , crystals , and / or cryptocrystalline or microcrystalline rock sub- stance . The term is , however , becoming obsolete , partly because of its ordinary ...
... Volcanic . - Fine - grained pyroclastic material composed of comminuted glass , crystals , and / or cryptocrystalline or microcrystalline rock sub- stance . The term is , however , becoming obsolete , partly because of its ordinary ...
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The Nomenclature of Petrology: With References to Selected Literature Arthur Holmes Visualização integral - 1920 |
The Nomenclature of Petrology: With References to Selected Literature Arthur Holmes Visualização integral - 1928 |
The Nomenclature of Petrology, with References to Selected Literature Arthur Holmes Pré-visualização indisponível - 2016 |
Palavras e frases frequentes
abundant ægirine albite alkali-felspars altered amphiboles analcite andesite anorthite apatite aphanitic augite basaltic biotite Bull calcareous calcite characterised chemical chlorite composed essentially composition constituents containing phenocrysts crystalline crystals deposits diabase diorite dolerite dyke felsic felspar felspathoid fine-grained foliation formed G. W. Tyrrell gabbro garnet Geol glass gneiss grains granite granular groundmass H. S. Washington Harker Holmes hornblende hypersthene igneous rocks Inst intrusions J. J. H. Teall J. P. Iddings J. S. Flett Journ L. V. Pirsson labradorite Lacroix lava leucite leucocratic limestone mafic mafic minerals magma magnetite melanocratic metamorphic rocks mica nepheline nepheline-syenite occurring oligoclase olivine origin orthoclase phanerocrystalline rock phenocrysts plagioclase porphyritic Proc pyroxene quartz R. A. Daly rock composed rock containing Rosenbusch sandstone schist schistose Sederholm shale Shand siliceous solution structure Surv syenite T. G. Bonney term applied term suggested texture tion trachyte Trans tuffs variety volcanic rock W. C. Brögger
Passagens conhecidas
Página 6 - When I use a word," Humpty Dumpty said in rather a scornful tone, "it means just what I choose it to mean— neither more nor less." "The question is," said Alice, "whether you can make words mean so many different things." "The question is," said Humpty Dumpty, "which is to be master— that's all.
Página 6 - I don't know what you mean by 'glory'," Alice said. Humpty Dumpty smiled contemptuously. "Of course you don't — till I tell you. I mean 'there's a nice knockdown argument for you' !" "But 'glory' doesn't mean 'a nice knock-down argument',
Página 80 - DACITE (qv) ie containing both orthoelaso and plagioclase (oligoclaseandesine). differentiation. A general term for the processes whereby different types of igneous rocks, which may or may not form parts of the same mass, are produced from a common magmatic source.
Página 84 - ... rounded extrusions of highly viscous lava squeezed out from a volcano, and congealed above and around the orifice instead of flowing away in streams. Portions of older lavas or ejectamenta may be elevated by the pressure of the new lava rising from beneath. The second type of dome is usually distinguished as a •volcanic dome.
Página 181 - A term applied to igneous rocks in which all the crystals of the essential minerals can be distinguished individually by the naked eye ; contrasted with aphanitic.
Página 28 - Alluvium is a general term for all detrital deposits resulting from the operations of modern rivers, thus including the sediments laid down in river beds, flood plains, lakes, fans at the foot of mountain slopes, and estuaries (Howell, et al., 1957, p.
Página 54 - A large transgressivo intrusion with steeply-inclined sides and no visible or determinable floor. cataclastic. A term used in reference to the structures produced in a rock by the action of severe mechanical stress during dynamic metamorphism, characteristic features being the deformation and granulation of the minerals. clastic. A term applied to rocks composed of fragments of pre-existing rocks. contact metamorphism. The alteration of rocks in contact with, or proximity to, a body of igneous rock....
Página 203 - Mineralogical varieties such as feldspathic and glauconitic sandstones are recognized, and also argillaceous, siliceous, calcareous, ferruginous and other varieties according to the nature of the binding or cementing material (AGI).
Página 27 - A term applied to those minerals of igneous rocks which are not bounded by their characteristic crystal faces. = Anhedral = Xenomorphic.
Página 178 - A term applied to the manganese nodules and concretions of deep-sea deposits - — HaloboTitc. " Challenger " Rep. (Deep Sea Deposits), iS91, p. 341. Pelite, Naumann. — A general term for clastic sediments composed of clay, minute particles of quartz, or rock-flour.