WorldWide Drilling Resource

30 MAY 2013 WorldWide Drilling Resource ® Frequently-Used Geological Terms Part 19 Glossary Adapted from the Dictionary of Geological Terms F - Continued Fault Scarp - The cliff or escarpment formed by a fault that reaches the earth’s surface. Most fault scarps have beenmod- ified by erosion since the faulting. Fault Set - A group of faults which are parallel or nearly so, related to a partic- ular deformational episode. Fault Surface - The surface along which dislocation on a fault has taken place. Fault System - Two or more intercon- necting fault sets. Fault Trap - An oil or gas trap in which the closure results from the presence of one or more faults. Fault Valley - A linear depression pro- duced by faulting; e.g. a large graben (depressed crust segment bounded by faults on two or more sides) situated be- tween tilted block mountains. Fault Zone - A fault expressed as a zone of numerous small fractures or of fault breccia or gouge. A fault zone may be hundreds of yards wide. Fayalite - A brown to black mineral of the olivine group. It is isomorphous with fors- terite, and occurs chiefly in igneous rocks. Feather Edge - The thin edge of a bed of sedimentary rock where it disappears by thinning, pinching, or wedging out. Feather Jointing - A joint pattern formed in a fault zone by shear and tension. The joints appear to the fault as the barbs of a feather to its shaft. Feldspar - A group of abundant rock- forming minerals. Feldspars are the most widespread of any mineral group and constitute 60% of the earth’s crust; they occur in all types of rock. Feldspathic - A rock or other mineral aggregate containing feldspar. Feldspathic Sandstone - A sandstone containing from 10-25% feldspar, inter- mediate in composition between a quartz sandstone and an arkosic sandstone . Feldspathoid - A group of comparatively rare rock-forming minerals related to the feldspars but containing less silica. Felds- pathoids take the place of feldspars in igneous rocks undersaturated with respect to silica; they are never found in the same rock with quartz. Felsite - A general term for any light- colored, aphanitic igneous rock, with or without phenocrysts and composed chiefly of quartz and feldspar. Felsitic - Pertaining to felsite. Femic - Said of an igneous rock having one or more normative, dark-colored iron-, magnesium-, or calcium-rich minerals as the major components of the norm; also, said of such minerals. Ferricrete - A conglomerate consisting of surficial sand and gravel cemented into a hard mass by iron oxide. Ferriferous - Iron-bearing. Ferroalloy -Ametal whose chief use is for alloying with iron to produce special quality steel. Ferroalloy metals include manganese, nickel, chromium, tungsten, molybdenum, vanadium, cobalt, and titanium. Ferromagnesian - Containing iron and magnesium. Ferruginous - 1. Pertaining to or con- taining iron, e.g. a sandstone cemented with iron oxide. 2. Said of a rock having a red or rusty color due to the presence of ferric oxide (the quantity of which may be very small). A fayalite crystal group from Germany. Photo courtesy of wannenkopfe.strahlen.org Next month, we will continue the letter F. Thanks for the Donation! Chris Graves, a Fleming College Alumni and sales support manager with Atlas Copco, posed with some of the Resources Drilling and Blasting students from the college. The Atlas Copco five-inch down-the-hole ham- mer was donated for training purposes. Focus on Elko Mining Expo 2013 Are you ready for the 28 th Annual Elko Mining Expo? The WWDR Team is! It is set for June 3-7, at the Elko Convention Center in Elko, Nevada. The two-day golf tournament at Ruby View Golf Course starts Monday with flight one’s tee off time at 7:30 a.m. Flight two goes at 1:00 p.m. On Tuesday, flight three begins at 7:30 a.m. and flight four’s tee off time is 1:00 p.m. The annual golf tournament awards banquet will be at 5:30 p.m. Elko Mining Expo’s opening cere- mony and reception is set for 6:00 p.m. Wednesday at the Flying Fish Restaurant. See everything you need for a suc- cessful mining operation at the mining exhibits and product showcase, open Thursday from 9:00 a.m. to 5:00 p.m. Friday, the product showcase is open from 9:00 a.m. to noon; and the mining exhibits are open from 9:00 a.m. to 3:00 p.m. For more information, call 775-738-4091 or visit www.elkocva.com A great time was had by all during last year’s opening. WWDR photos. Geoprobe ® at the 2012 Elko Mining Expo.