{"id":2541,"date":"2013-01-28T13:39:06","date_gmt":"2013-01-28T13:39:06","guid":{"rendered":"http:\/\/www.sohag-univ.edu.eg\/facsci\/?p=2541"},"modified":"2013-01-28T13:39:06","modified_gmt":"2013-01-28T13:39:06","slug":"ore-petrology-and-applied-sedimentology-for-4th-year-geology-students","status":"publish","type":"post","link":"https:\/\/sci.sohag-univ.edu.eg\/main\/ore-petrology-and-applied-sedimentology-for-4th-year-geology-students\/","title":{"rendered":"ore petrology and applied sedimentology for 4th year geology students"},"content":{"rendered":"<p dir=\"RTL\" align=\"right\"><strong>\u00a0<\/strong><\/p>\n<p dir=\"RTL\" align=\"center\"><strong>A- Applied sedimentology<\/strong><\/p>\n<p dir=\"RTL\" align=\"center\"><strong>\u00a0<\/strong><\/p>\n<p dir=\"RTL\" align=\"right\"><strong><span style=\"text-decoration: underline\">Answer the following questions illustrating your word whenever possible:<\/span><\/strong><\/p>\n<p dir=\"RTL\" align=\"right\"><strong>1- The roll-front uranium ore is controlled by weathering process and environment of deposition, explain this and give an example from the geological record for this type of ore. (20 marks)<\/strong><\/p>\n<p dir=\"RTL\" align=\"right\"><strong>\u00a0<\/strong><\/p>\n<p dir=\"RTL\" align=\"right\"><strong><span style=\"text-decoration: underline\">2- Tick the correct statement and put (x) by the false one<\/span><\/strong><strong>: (15 marks)<\/strong><\/p>\n<p dir=\"RTL\" align=\"right\"><strong>\u00a0\u00a0\u00a0\u00a0\u00a0 a- Cinnabar mineral is one of the most dangerous mineral.<\/strong><\/p>\n<p dir=\"RTL\" align=\"right\"><strong>\u00a0\u00a0\u00a0\u00a0\u00a0 b- Eolian sand is suitable for making concrete.<\/strong><\/p>\n<p dir=\"RTL\" align=\"right\"><strong>\u00a0\u00a0\u00a0\u00a0\u00a0 c- Placers can accumulate on the lee side of sand dunes.<\/strong><\/p>\n<p dir=\"RTL\" align=\"right\"><strong>\u00a0\u00a0\u00a0 \u00a0\u00a0d- Granite wash serve as good oil reservoir.<\/strong><\/p>\n<p dir=\"RTL\" align=\"right\"><strong>\u00a0\u00a0\u00a0\u00a0\u00a0 e- All porous rocks are permeable. <\/strong><\/p>\n<p dir=\"RTL\" align=\"right\"><strong>\u00a0<\/strong><\/p>\n<p dir=\"RTL\" align=\"right\"><strong>3- Complete the following sentences: (10 marks)<\/strong><\/p>\n<p dir=\"RTL\" align=\"right\"><strong>\u00a0\u00a0\u00a0\u00a0\u00a0 a- Limestone is very important sedimentary rocks. Several important industries depend on it as 1- \u2026\u2026\u2026..,2-\u2026\u2026\u2026\u2026. 3-<\/strong><\/p>\n<p dir=\"RTL\" align=\"right\"><strong>\u00a0\u00a0\u00a0\u00a0\u00a0 b- Fluvial deposits are very important because 1\u2026\u2026\u2026\u2026. 2&#8212;&#8212;&#8212;&#8212; 3&#8212;&#8212;&#8211;<\/strong><\/p>\n<p dir=\"RTL\" align=\"right\"><strong>\u00a0\u00a0\u00a0\u00a0\u00a0 c- Weathering products may be solids which remain in situ as residual deposits\u00a0 as \u2026\u2026\u2026\u2026, \u2026\u2026\u2026.and \u2026\u2026\u2026\u2026\u2026.or go in solution as \u2026\u2026\u2026and \u2026\u2026..\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/strong><\/p>\n<p dir=\"RTL\"><strong>\u00a0<\/strong><\/p>\n<p align=\"center\"><strong><span style=\"text-decoration: underline\">B- Ore Petrology<\/span><\/strong><\/p>\n<p align=\"center\"><strong>\u00a0<\/strong><\/p>\n<p><strong><span style=\"text-decoration: underline\">1- Explain briefly (with illustrations):<\/span><\/strong><\/p>\n<p><strong>A) The petrological interrelationships of ore minerals in the following ore deposits: (15 marks) <\/strong><\/p>\n<p><strong>1) Fe-Ti oxide deposits.<\/strong><\/p>\n<p><strong>2) Fe- Cu-Ni sulfide deposits.<\/strong><\/p>\n<p><strong>3) Alpine-type chromite deposits.<\/strong><\/p>\n<p><strong>B)<\/strong><strong> The method of Sharpe et al (1985) of arsenopyrite geothermometry. (5 marks)<\/strong><\/p>\n<p><strong>\u00a0<\/strong><\/p>\n<p><strong><span style=\"text-decoration: underline\">2-Choose the correct answer (10 marks)<\/span><\/strong><\/p>\n<p><strong>a- Growth of sulfide minerals in lavas takes place in the form of<em> <\/em>(skeletal crystals &#8211; <span style=\"text-decoration: underline\">round droplets<\/span> &#8211; euhedral to subhedral crystals)<em>.<\/em><\/strong><\/p>\n<p><strong>\u00a0<\/strong><\/p>\n<p><strong>b- The tubular disconcordant orebodies are characterized by (<\/strong><strong>pinch and swell structure<\/strong><strong> &#8211; <\/strong><strong><span style=\"text-decoration: underline\">branching and\u00a0 anastomosing<\/span><\/strong><strong> &#8211;<\/strong><strong> stockworks).<\/strong><\/p>\n<p><strong>\u00a0<\/strong><\/p>\n<p><strong>c- (<span style=\"text-decoration: underline\">Stratiform<\/span> \u2013 Starabound \u2013 Disseminated) deposits show a considerable development parallel to bedding and a limited development perpendicular to it.<\/strong><strong><\/strong><\/p>\n<p><strong>\u00a0<\/strong><\/p>\n<p><strong>d- Diamond deposits in kimberlite represent (concordant orebodies- <span style=\"text-decoration: underline\">discordant orebodies<\/span>&#8211; residual orebodies).<\/strong><\/p>\n<p>&nbsp;<\/p>\n<p>e- Replacement of magnetite by martite is carried out through (<span style=\"text-decoration: underline\">change in oxidation state<\/span> &#8211; change in anions &#8211; selective remove of one cation).<\/p>\n<p><strong>\u00a0<\/strong><\/p>\n<p><strong><span style=\"text-decoration: underline\">4- Put (<\/span><\/strong><strong><span style=\"text-decoration: underline\">\u00d6<\/span><\/strong><strong><span style=\"text-decoration: underline\">) after the true statement and (X) after the false one in the following: <\/span><\/strong><strong>(10 marks)<\/strong><\/p>\n<p><strong>A-Rounding-off of wall-rock surfaces on both sides of a <\/strong><strong>mineral deposit within a fracture indicates its formation by open<\/strong><strong> space deposition.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0( <\/strong><strong>\u00b4<\/strong><strong> ).\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/strong><\/p>\n<p><strong>\u00a0<\/strong><\/p>\n<p><strong>B- Starabound orebodies are restricted to a particular part of the stratigraphic column, regardless whether the orebody is concordant or discordant.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(<\/strong><strong>\u00d6<\/strong><strong> ).<\/strong><\/p>\n<p><strong>\u00a0\u00a0 <\/strong><strong><\/strong><\/p>\n<p><strong>C-<\/strong><strong>&#8220;Pinch and swell structure&#8221;<\/strong><strong> results from later replacement of fracture walls\u00a0\u00a0\u00a0\u00a0\u00a0 (<\/strong><strong>\u00b4<\/strong><strong> ).<\/strong><\/p>\n<p><strong>\u00a0<\/strong><\/p>\n<p><strong>D- Layered chromite deposits are formed in tectonically unstable environments while podiform ones are formed in tectonically stable conditions.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/strong><strong>(\u00a0 <\/strong><strong>\u00b4<\/strong><strong>\u00a0 ).<\/strong><\/p>\n<p><strong>\u00a0<\/strong><\/p>\n<p><strong>E- Metamorphic fluids are produced by break down of hydrous silicate and carbonate minerals at the transition from greenscist to amphipolite facies.\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/strong><strong>(\u00a0 <\/strong><strong>\u00d6<\/strong><strong>\u00a0 ).<\/strong><\/p>\n<p><strong>\u00a0<\/strong><\/p>\n<p><strong><span style=\"text-decoration: underline\">5- Complete the missing parts in the following statements<\/span><\/strong><strong><span style=\"text-decoration: underline\"> (5 marks)<\/span><\/strong><strong><span style=\"text-decoration: underline\">:<\/span><\/strong><\/p>\n<p><strong>A) <span style=\"text-decoration: underline\">Breccia ores<\/span> results from deformation of crustified veins during or after ore formation.<\/strong><\/p>\n<p><strong>B)- The exsolution type in which structures of both phases are completely different or without crystallographic continuity across the interface between phases is called exsolution.<\/strong><\/p>\n<p><strong>C- Experimental work showed that chalcopyrite disease is not an exsolution, so it is most propably to be <span style=\"text-decoration: underline\">epitaxial intergrowth<\/span>.<\/strong><\/p>\n<p><strong>D<\/strong><strong>&#8211; <span style=\"text-decoration: underline\">VMS<\/span> <span style=\"text-decoration: underline\">deposits<\/span> are generally stratiform lenticular or sheetlike orebodies developed at interfaces or horizons of pauses in volcanism or change from volcanism to sedimentation.<\/strong><\/p>\n<p><strong>E- In Ag-Bi-Co-Ni-As vein deposits, <span style=\"text-decoration: underline\">native silver <\/span>is petrologically found in dendritic\u00a0 patterns that are surrounded by rosettes of colloform arsenides. <\/strong><\/p>\n<p>__________________________________________________________________________<\/p>\n<p>&nbsp;<\/p>\n<p><strong>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Good luck\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 __________________________ Dr. Abdel Aziz El Haddad<\/strong><\/p>\n<p><strong>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Dr. Ahmed Abdelrasheed<\/strong><\/p>\n<p><strong>\u00a0<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u00a0 A- Applied sedimentology \u00a0 Answer the following questions illustrating your word whenever possible: 1- The roll-front uranium ore is controlled by weathering process and environment of deposition, explain this [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2542,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18],"tags":[],"class_list":["post-2541","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-18"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>ore petrology and applied sedimentology for 4th year geology students - \u0643\u0644\u064a\u0629 \u0627\u0644\u0639\u0644\u0648\u0645<\/title>\n<meta name=\"robots\" content=\"index, follow, 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