- 行业: Mining
- Number of terms: 33118
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The U.S. Bureau of Mines (USBM) was the primary United States Government agency conducting scientific research and disseminating information on the extraction, processing, use, and conservation of mineral resources.
Founded on May 16, 1910, through the Organic Act (Public Law 179), USBM's missions ...
A term proposed by Brooks (1954) for sedimentary limestone. Compare: metalimestone; orthomarble.
Industry:Mining
A term proposed by Clarke (1908) to replace basic. Compare: persilicic; mediosilicic.
Industry:Mining
A term proposed by Clarke (1908) to replace intermediate. Compare: subsilicic; persilicic.
Industry:Mining
A term proposed by Dana to describe metamorphism that involves a chemical change in the affected rocks.
Industry:Mining
A term proposed by Johannsen; derived by contracting the word feldspathoid; used in his classification of igneous rocks to indicate one of the feldspathoidal group of minerals. Compare: feldspathoid
Industry:Mining
A term proposed by Pettijohn (1957) for a conglomerate that is not a product of normal aqueous flow, but is deposited by such agents as subaqueous turbidity slides and glacier ice; it contains more matrix than gravel-sized fragments (pebbles may form less than 10% of the rock). Examples include tillites, pebbly mudstones, and relatively structureless clay or shale bodies in which pebbles or cobbles are randomly distributed.
Industry:Mining
A term proposed by Pettijohn (1957) for a conglomerate that is not a product of normal aqueous flow, but is deposited by such agents as subaqueous turbidity slides and glacier ice; it contains more matrix than gravel-sized fragments (pebbles may form less than 10% of the rock). Examples include tillites, pebbly mudstones, and relatively structureless clay or shale bodies in which pebbles or cobbles are randomly distributed.
Industry:Mining
A term proposed by Shrock (1947) for a residual surficial layer produced by intense and prolonged chemical weathering and composed largely of certain original constituents of the source rock. Typical accumulations of loipon are the gossans over orebodies, bauxite 1837 deposits in Arkansas, terra rossa deposits of Europe, and duricrust of Australia. Etymol: Greek, residue. Adj: loiponic.
Industry:Mining
A term proposed by Spurr (1923) for a magma that may crystallize into an ore; the sulfide, oxide, or other metallic facies of a solidified magma.
Industry:Mining
