Mineral DepositsMcGraw-Hill Book Company, Incorporated, 1913 - 883 páginas |
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Términos y frases comunes
abundant acid adularia altered andesite barite basalt beds Bull calcite calcium California carbon dioxide cassiterite cent chalcocite chalcopyrite chert chlorite cinnabar clay concentration contact-metamorphic contain country rock crystalline crystals depth derived dikes district dolomite epidote fault feet feldspar ferric fissures fluorite formation formed galena gangue minerals garnet Geology gold granite gravels gypsum H₂O hematite igneous rocks Inst intrusive iron Jour kaolin Lake limestone limonite Lindgren lode magma magnesium magnetite manganese masses metals metamorphism metasomatic mineral deposits mines Nevada nickel occur ore-bodies origin oxidation Paleozoic pegmatite phosphate places porphyry potassium prakt precipitation present probably production pyrite pyrrhotite quantities quartz quartzite rarely region replacement rich salt sandstone schists sedimentary sediments sericite serpentine shale siderite silicates silver slates soluble solutions springs strata sulphate sulphides sulphur surface waters Surv Survey temperature Tertiary tetrahedrite thick tion tourmaline Trans U. S. Geol veins volcanic Zeitschr zeolites zinc blende zone
Pasajes populares
Página 91 - ... non-eroding amounts. EXTENSION AREA. A test range in excess of that provided by the main White Sands Missile Range (WSMR) required for an indefinite period of time to support future military programs. EXTRUSIVE ROCK. Rocks derived from magma poured out or ejected at the earth's surface . FAULT. A fracture in the earth's crust accompanied by a displacement of one side with respect to the other. FAULT BLOCK. A...
Página 93 - In crystallography, a solid figure contained by eight Isosceles triangles. (Standard) Displacement. 1. The word "displacement" should receive no technical meaning, but is reserved for general use; it may be applied to a relative movement of the two sides of the fault, measured in any direction, when that direction is specified ; for instance, the displacement of a stratum along a drift In a mine would be the distance between the two sections of the stratum measured along the drift. The word "dislocation"...
Página 92 - A horse (Fig. 110) is a mass of rock broken from one wall and caught between the walls of the fault. The fault strike is the direction of the intersection of the fault surface, or the shear zone, with a horizontal plane.
Página 443 - Lindgren 1 states : When it is noted that hot springs and volcanic surface flows are present in almost all regions of importance (except Almaden in Spain, Idria in Austria, and Nikitowka in Russia) and that cinnabar in considerable quantities is associated with undoubted spring deposits or is actually deposited in hot springs, the argument becomes very strong indeed that such hot springs have formed the majority of the deposits. For the few deposits that have no such clear connection with...
Página 339 - ... although some of it was simultaneously carried away and redeposited. The result was ferruginous chert or jasper, averaging less than 30 per cent, of iron. lieved to have formed by weathering of lean silicates and carbonates...
Página 102 - Gravity. See Normal fault. Hinge. A faulting about an axis normal to the plane of faulting, which may produce a fault that on one side of the pivotal axis would be called normal and on the other side reverse, yet there may not be any differential movement in the center of the mass...
Página 533 - FL Ransome and FC Calkins: The Geology and Ore Deposits of the Coeur d'Alene District. Idaho.
Página 721 - The ore, more or less mixed with the rock, forms irregular bunches and masses along the contacts or in the interior of the intrusive masses; frequently also it forms illdefined streaks or "schlieren." In part the ore may have a secondary origin, being developed together with magnetite during the process of serpentinization from primary chromite, picotite, chromium-diposide, etc.
Página 22 - When the temperature of a system in equilibrium is raised, that reaction takes place which is accompanied by absorption of heat ; and, conversely, when the temperature is lowered, that reaction occurs which is accompanied by an evolution of heat.
Página 371 - There are, therefore, certain conditions — not yet fully elucidated — which are necessary for the deposition of zeolites. It is probable that their development would be greatly furthered if the eruption of the effusive rock took place under water; the sea water would cool the surface of the flow and a slow downward movement would be caused in the porous rock. Besides, these conditions would give rise to a system, cool at one end, hot at the other, in which circulation competent to effect concentration...