{"id":2555,"date":"2013-01-29T12:11:54","date_gmt":"2013-01-29T12:11:54","guid":{"rendered":"http:\/\/www.sohag-univ.edu.eg\/facsci\/?p=2555"},"modified":"2013-01-29T12:13:40","modified_gmt":"2013-01-29T12:13:40","slug":"ore-petrology-and-applied-sedimentology-for-4th-year-geology-student","status":"publish","type":"post","link":"https:\/\/sci.sohag-univ.edu.eg\/main\/ore-petrology-and-applied-sedimentology-for-4th-year-geology-student\/","title":{"rendered":"ore petrology and applied sedimentology for 4th year geology student"},"content":{"rendered":"

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/strong><\/span>Final exam. Of<\/strong> ore petrology and applied sedimentology for 4th<\/sup> year geology student<\/strong><\/span><\/p>\n

\n

First semester ( January 2011)\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\u00a0Time allowed 2 hours<\/strong><\/span><\/p>\n<\/div>\n

\u00a0<\/strong><\/span><\/p>\n

A- Applied sedimentology<\/strong><\/span><\/p>\n

\u00a0<\/strong><\/span><\/p>\n

Answer the following questions illustrating your word whenever possible:<\/span><\/strong><\/span><\/p>\n

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

\u00a0<\/strong><\/p>\n

2- Tick the correct statement and put (x) by the false one<\/span><\/strong>: (15 marks)<\/strong><\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0 a- Cinnabar mineral is one of the most dangerous mineral.<\/strong><\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0 b- Eolian sand is suitable for making concrete.<\/strong><\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0 c- Placers can accumulate on the lee side of sand dunes.<\/strong><\/p>\n

\u00a0\u00a0\u00a0 \u00a0\u00a0d- Granite wash serve as good oil reservoir.<\/strong><\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0 e- All porous rocks are permeable. <\/strong><\/p>\n

\u00a0<\/strong><\/p>\n

3- Complete the following sentences: (10 marks)<\/strong><\/p>\n

\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

\u00a0\u00a0\u00a0\u00a0\u00a0 b- Fluvial deposits are very important because 1\u2026\u2026\u2026\u2026. 2———— 3——–<\/strong><\/p>\n

\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

\u00a0<\/strong><\/p>\n

B- Ore Petrology<\/span><\/strong><\/span><\/p>\n

\u00a0<\/strong><\/p>\n

1- Explain briefly (with illustrations):<\/span><\/strong><\/p>\n

A) The petrological interrelationships of ore minerals in the following ore deposits: (15 marks) <\/strong><\/p>\n

1) Fe-Ti oxide deposits.<\/strong><\/p>\n

2) Fe- Cu-Ni sulfide deposits.<\/strong><\/p>\n

3) Alpine-type chromite deposits.<\/strong><\/p>\n

B)<\/strong> The method of Sharpe et al (1985) of arsenopyrite geothermometry. (5 marks)<\/strong><\/p>\n

\u00a0<\/strong><\/p>\n

2-Choose the correct answer (10 marks)<\/span><\/strong><\/span><\/p>\n

a- Growth of sulfide minerals in lavas takes place in the form of <\/em>(skeletal crystals – round droplets<\/span> – euhedral to subhedral crystals).<\/em><\/strong><\/span><\/p>\n

\u00a0<\/strong><\/p>\n

b- The tubular disconcordant orebodies are characterized by (<\/strong>pinch and swell structure<\/strong> – <\/strong>branching and\u00a0 anastomosing<\/span><\/strong> –<\/strong> stockworks).<\/strong><\/p>\n

\u00a0<\/strong><\/p>\n

c- (Stratiform<\/span> \u2013 Starabound \u2013 Disseminated) deposits show a considerable development parallel to bedding and a limited development perpendicular to it.<\/strong><\/strong><\/p>\n

\u00a0<\/strong><\/p>\n

d- Diamond deposits in kimberlite represent (concordant orebodies- discordant orebodies<\/span>– residual orebodies).<\/strong><\/p>\n

 <\/p>\n

e- Replacement of magnetite by martite is carried out through (change in oxidation state<\/span> – change in anions – selective remove of one cation).<\/p>\n

\u00a0<\/strong><\/p>\n

4- Put (<\/span><\/strong>\u00d6<\/span><\/strong>) after the true statement and (X) after the false one in the following: <\/span><\/strong>(10 marks)<\/strong><\/span><\/p>\n

A-Rounding-off of wall-rock surfaces on both sides of a <\/strong>mineral deposit within a fracture indicates its formation by open<\/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>\u00b4<\/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><\/span><\/p>\n

\u00a0<\/strong><\/span><\/p>\n

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>\u00d6<\/strong> ).<\/strong><\/p>\n

\u00a0\u00a0 <\/strong><\/strong><\/p>\n

C-<\/strong>“Pinch and swell structure”<\/strong> results from later replacement of fracture walls\u00a0\u00a0\u00a0\u00a0\u00a0 (<\/strong>\u00b4<\/strong> ).<\/strong><\/p>\n

\u00a0<\/strong><\/p>\n

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>(\u00a0 <\/strong>\u00b4<\/strong>\u00a0 ).<\/strong><\/p>\n

\u00a0<\/strong><\/p>\n

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>(\u00a0 <\/strong>\u00d6<\/strong>\u00a0 ).<\/strong><\/p>\n

\u00a0<\/strong><\/p>\n

5- Complete the missing parts in the following statements<\/span><\/strong> (5 marks)<\/span><\/strong>:<\/span><\/strong><\/span><\/p>\n

A) Breccia ores<\/span> results from deformation of crustified veins during or after ore formation.<\/strong><\/span><\/p>\n

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

C- Experimental work showed that chalcopyrite disease is not an exsolution, so it is most propably to be epitaxial intergrowth<\/span>.<\/strong><\/p>\n

D<\/strong>– VMS<\/span> 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

E- In Ag-Bi-Co-Ni-As vein deposits, native silver <\/span>is petrologically found in dendritic\u00a0 patterns that are surrounded by rosettes of colloform arsenides. <\/strong><\/p>\n

__________________________________________________________________________<\/p>\n

Good luck\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 __________________________ Dr. Abdel Aziz El Haddad<\/strong><\/p>\n

\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","protected":false},"excerpt":{"rendered":"

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Final exam. Of ore petrology and applied sedimentology for 4th year geology student First semester ( January 2011)\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\u00a0Time allowed 2 hours \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 […]<\/p>\n","protected":false},"author":1,"featured_media":2556,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"zakra_page_container_layout":"customizer","zakra_page_sidebar_layout":"customizer","zakra_remove_content_margin":false,"zakra_sidebar":"customizer","zakra_transparent_header":"customizer","zakra_logo":0,"zakra_main_header_style":"default","zakra_menu_item_color":"","zakra_menu_item_hover_color":"","zakra_menu_item_active_color":"","zakra_menu_active_style":"","zakra_page_header":true,"footnotes":""},"categories":[18],"tags":[],"class_list":["post-2555","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-18"],"rttpg_featured_image_url":{"full":["https:\/\/sci.sohag-univ.edu.eg\/main\/wp-content\/uploads\/2013\/01\/images8.jpg",259,194,false],"landscape":["https:\/\/sci.sohag-univ.edu.eg\/main\/wp-content\/uploads\/2013\/01\/images8.jpg",259,194,false],"portraits":["https:\/\/sci.sohag-univ.edu.eg\/main\/wp-content\/uploads\/2013\/01\/images8.jpg",259,194,false],"thumbnail":["https:\/\/sci.sohag-univ.edu.eg\/main\/wp-content\/uploads\/2013\/01\/images8-150x150.jpg",150,150,true],"medium":["https:\/\/sci.sohag-univ.edu.eg\/main\/wp-content\/uploads\/2013\/01\/images8.jpg",259,194,false],"large":["https:\/\/sci.sohag-univ.edu.eg\/main\/wp-content\/uploads\/2013\/01\/images8.jpg",259,194,false],"1536x1536":["https:\/\/sci.sohag-univ.edu.eg\/main\/wp-content\/uploads\/2013\/01\/images8.jpg",259,194,false],"2048x2048":["https:\/\/sci.sohag-univ.edu.eg\/main\/wp-content\/uploads\/2013\/01\/images8.jpg",259,194,false]},"rttpg_author":{"display_name":"admin","author_link":"https:\/\/sci.sohag-univ.edu.eg\/main\/author\/admin\/"},"rttpg_comment":0,"rttpg_category":"\u0645\u0633\u062a\u0646\u062f\u0627\u062a \u0644\u0644\u062a\u062d\u0645\u064a\u0644<\/a>","rttpg_excerpt":"\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Final exam. Of ore petrology and applied sedimentology for 4th year geology student First semester ( January 2011)\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\u00a0Time allowed 2 hours \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…","_links":{"self":[{"href":"https:\/\/sci.sohag-univ.edu.eg\/main\/wp-json\/wp\/v2\/posts\/2555","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sci.sohag-univ.edu.eg\/main\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/sci.sohag-univ.edu.eg\/main\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/sci.sohag-univ.edu.eg\/main\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/sci.sohag-univ.edu.eg\/main\/wp-json\/wp\/v2\/comments?post=2555"}],"version-history":[{"count":3,"href":"https:\/\/sci.sohag-univ.edu.eg\/main\/wp-json\/wp\/v2\/posts\/2555\/revisions"}],"predecessor-version":[{"id":2558,"href":"https:\/\/sci.sohag-univ.edu.eg\/main\/wp-json\/wp\/v2\/posts\/2555\/revisions\/2558"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/sci.sohag-univ.edu.eg\/main\/wp-json\/wp\/v2\/media\/2556"}],"wp:attachment":[{"href":"https:\/\/sci.sohag-univ.edu.eg\/main\/wp-json\/wp\/v2\/media?parent=2555"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sci.sohag-univ.edu.eg\/main\/wp-json\/wp\/v2\/categories?post=2555"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sci.sohag-univ.edu.eg\/main\/wp-json\/wp\/v2\/tags?post=2555"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}