The Nomenclature of Petrology: With References to Selected LiteratureThomas Murby & Company, 1920 - 284 páginas |
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Página 24
... cent . Cf. Persilicic and Oversaturated . Adamellite , Cathrein , 1890. - A term applied origin- ally to an orthoclase - bearing tonalite , and now used generally for granites in which plagioclase varies from one - third to two - thirds ...
... cent . Cf. Persilicic and Oversaturated . Adamellite , Cathrein , 1890. - A term applied origin- ally to an orthoclase - bearing tonalite , and now used generally for granites in which plagioclase varies from one - third to two - thirds ...
Página 32
... cent . ) and olivine . Anhedral , Pirsson , 1895. - See Allotriomorphic . Anhedron , Pirsson , 1895. - A term applied to crystals which have failed to develop the faces naturally suggested by the term crystal . L. V. Pirsson : Bull ...
... cent . ) and olivine . Anhedral , Pirsson , 1895. - See Allotriomorphic . Anhedron , Pirsson , 1895. - A term applied to crystals which have failed to develop the faces naturally suggested by the term crystal . L. V. Pirsson : Bull ...
Página 33
... cent . of volatile matter and over 90 per cent . of carbon , and which therefore burns slowly with a smokeless flame . Anthracite can be handled without soiling the fingers and has a high lustre . A. Strahan Mem . Geol . Surv . ( Coals ...
... cent . of volatile matter and over 90 per cent . of carbon , and which therefore burns slowly with a smokeless flame . Anthracite can be handled without soiling the fingers and has a high lustre . A. Strahan Mem . Geol . Surv . ( Coals ...
Página 35
... cent . of magnetite . H. S. Washington & E. S. Larsen : Journ . Wash . Acad . Sci . , iii , 1913 , P. 449 . Arctic ... cent . of quartz and 18 per cent . of orthoclase . ( Arizona . ) Arkite , Washington , 1901. A holocrystalline por ...
... cent . of magnetite . H. S. Washington & E. S. Larsen : Journ . Wash . Acad . Sci . , iii , 1913 , P. 449 . Arctic ... cent . of quartz and 18 per cent . of orthoclase . ( Arizona . ) Arkite , Washington , 1901. A holocrystalline por ...
Página 43
... cent . Cf. subsilicic and undersaturated . Basis . See Mesostasis . Batholith , Suess , 1888. - A large transgressive intru- sion with sides generally steeply inclined , and with no visible or determinable floor . Smaller intru- sions ...
... cent . Cf. subsilicic and undersaturated . Basis . See Mesostasis . Batholith , Suess , 1888. - A large transgressive intru- sion with sides generally steeply inclined , and with no visible or determinable floor . Smaller intru- sions ...
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The Nomenclature of Petrology: With References to Selected Literature Arthur Holmes Visualização integral - 1920 |
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Palavras e frases frequentes
abundant ægirine aggregates albite alkali-felspars altered amphiboles analcite andesine 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 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.