Mineral DepositsMcGraw-Hill Book Company, Incorporated, 1913 - 883 Seiten |
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abundant acid albite altered rock andesite arsenopyrite barite beds biotite Bull calcite calcium California carbon dioxide cassiterite cent chalcocite chalcopyrite chloride chlorite clay concentration contact-metamorphic contain copper deposits country rock crystalline crystals depth dikes district dolomite Econ epidote fault feet feldspar ferric fissures fluorite formation formed galena gangue minerals garnet Geology gold gold-bearing granite gravels gypsum H₂O igneous rocks Inst intrusive iron kaolin Lake limestone limonite Lindgren lode magma magnetite manganese masses metals metamorphism metasomatic mines Nevada nickel occur ore-bodies origin oxidation pegmatite phosphate places porphyry prakt precipitated present probably production pyrite pyrrhotite quantities quartz veins quartzite rarely region replacement rhyolite rich salt sandstone schists secondary sedimentary sediments sericite serpentine shale siderite silicates silver slates sodium soluble solutions springs sulphate sulphides sulphur surface Surv Survey temperature Tertiary tetrahedrite thick tion tourmaline Trans U. S. Geol volcanic Zeitschr zeolites zinc blende zone
Beliebte Passagen
Seite 115 - ... 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...
Seite 117 - 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"...
Seite 62 - Stabler, Herman, The mineral analysis of water for industrial purposes and its interpretation by the engineer: Eng.
Seite 459 - 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...
Seite 359 - ... 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...
Seite 126 - 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...
Seite 547 - FL Ransome and FC Calkins: The Geology and Ore Deposits of the Coeur d'Alene District. Idaho.
Seite 735 - 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.
Seite 350 - mainly of chert, or quartz, and ferric oxide segregated in bands or sheets, or irregularly mingled. Where in bands with the quartz layers colored red and the rocks highly crystalline it is called jasper, where less clearly crystallized and either in bands or irregularly intermixed the rock is known as ferruginous chert."15 The Lake Superior ores are the "product of enrichment of chemically deposited sediments, such as siderite and hydrated iron silicates...
Seite 20 - 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.