- 업종: 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 fluoride, Sr<sub>2</sub>Na<sub>2</sub>Al<sub>2</sub>(PO<sub>4</sub>)F<sub>9</sub>, from the Greenland cryolite deposit.
Industry:Mining
A flux gate or saturable reactor type of recording magnetometer. Used primarily in aircraft and there includes means for keeping the measuring element aligned in the direction of maximum intensity (that is, total field). In this case it records variations in the total field regardless of variations in its direction. Sometimes used for establishing the position of the aircraft as well as the magnetometer itself.
Industry:Mining
A fold in which beds maintain the same thicknesses throughout. Compare: similar fold; supratenuous fold.
Industry:Mining
A fold in which the orthogonal thickness of the folded strata is greater in the hinge than in the limbs, but the distance between any two folded surfaces is constant when measured parallel to the axial surface. Thus, if the shape of one bed is that of a sine curve, all the beds show the same shape. Similar folds show thinning on the limbs and thickening at the axes. Compare: parallel fold; supratenuous fold.
Industry:Mining
A fold in which one limb dips more steeply than the other. If one limb is overturned, the term "overturned fold" or "overfold" is used. Compare: symmetrical fold.
Industry:Mining
A fold in which the core contains the stratigraphically younger rocks; it is generally concave upward. Compare: anticline synclinal.
Industry:Mining
