- 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 structure common in strongly deformed sedimentary and metamorphic rocks, in which an original continuous competent layer or bed between less competent layers has been stretched, thinned, and broken at regular intervals into bodies resembling boudins or sausages, elongated parallel to the fold axes.
Industry:Mining
A structure consisting of several parallel faults in close proximity with no distortion.
Industry:Mining
A structure developed in certain phanerocrystalline rocks (e.g., granite and diorite) due to the occurrence of numerous orbicules.
Industry:Mining
A structure developed in certain phanerocrystalline rocks (e.g., granite and diorite) due to the occurrence of numerous orbicules.
Industry:Mining
A structure developed in certain phanerocrystalline rocks (e.g., granite and diorite) due to the occurrence of numerous orbicules.
Industry:Mining
A structure formed by mass-movement processes, consisting of widened, steeply inclined tension fissures or joints, resulting from lateral displacement of a slide mass and filled with debris derived from above. Primarily a British usage.
Industry:Mining
A structure in crystalline rocks characterized by an aggregate of small grains of quartz and feldspar occupying the interstices between, or forming borders on the edges of, 2059 much larger, rounded grains of the same minerals. Long considered a product of cataclasis, the structure may actually be the result of plastic deformation and dynamic recrystallization (Harte, 1977).
Industry:Mining
A structure in crystalline rocks characterized by an aggregate of small grains of quartz and feldspar occupying the interstices between, or forming borders on the edges of, 2059 much larger, rounded grains of the same minerals. Long considered a product of cataclasis, the structure may actually be the result of plastic deformation and dynamic recrystallization (Harte, 1977).
Industry:Mining
A structure in dynamically metamorphosed rock in which lenses and layers of original or relatively unaltered granular minerals are surrounded by a matrix of highly sheared and 1221 crushed material, giving the appearance of a crude flow structure; e.g., flaser gabbro. Compare: augen structure
Industry:Mining
A structure in which boxed cores from numerous recorded localities are stored and kept available for inspection and study.
Industry:Mining
