{"id":2506,"date":"2013-01-28T10:23:28","date_gmt":"2013-01-28T10:23:28","guid":{"rendered":"http:\/\/www.sohag-univ.edu.eg\/facsci\/?p=2506"},"modified":"2013-01-28T10:23:28","modified_gmt":"2013-01-28T10:23:28","slug":"4th-year-geology-students-of-ore-petrology-and-applied-sedimentology","status":"publish","type":"post","link":"https:\/\/sci.sohag-univ.edu.eg\/main\/4th-year-geology-students-of-ore-petrology-and-applied-sedimentology\/","title":{"rendered":"4th year geology students Of ore petrology and applied sedimentology"},"content":{"rendered":"

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

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

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

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

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

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

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

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

c- (Stratiform \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- residual orebodies).<\/strong><\/p>\n

 <\/p>\n

e- Replacement of magnetite by martite is carried out through (change in oxidation state – 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><\/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\u00a0(X).\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\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

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

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

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

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

C- Experimental work showed that chalcopyrite disease is not an exsolution, so it is most propably to be epitaxial growth<\/span> or replacement by Cu-rich fluids<\/span> (any or both).<\/strong><\/p>\n

D<\/strong>– VMS 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

 <\/p>\n

\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

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\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 Final exam. Of ore petrology and applied sedimentology for 4th year geology students 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 and environment of deposition, explain this and give […]<\/p>\n","protected":false},"author":1,"featured_media":2507,"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-2506","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\/girls-top.net_1354646589_751.jpeg",851,315,false],"landscape":["https:\/\/sci.sohag-univ.edu.eg\/main\/wp-content\/uploads\/2013\/01\/girls-top.net_1354646589_751.jpeg",851,315,false],"portraits":["https:\/\/sci.sohag-univ.edu.eg\/main\/wp-content\/uploads\/2013\/01\/girls-top.net_1354646589_751.jpeg",851,315,false],"thumbnail":["https:\/\/sci.sohag-univ.edu.eg\/main\/wp-content\/uploads\/2013\/01\/girls-top.net_1354646589_751-150x150.jpg",150,150,true],"medium":["https:\/\/sci.sohag-univ.edu.eg\/main\/wp-content\/uploads\/2013\/01\/girls-top.net_1354646589_751-300x111.jpg",300,111,true],"large":["https:\/\/sci.sohag-univ.edu.eg\/main\/wp-content\/uploads\/2013\/01\/girls-top.net_1354646589_751.jpeg",812,301,false],"1536x1536":["https:\/\/sci.sohag-univ.edu.eg\/main\/wp-content\/uploads\/2013\/01\/girls-top.net_1354646589_751.jpeg",851,315,false],"2048x2048":["https:\/\/sci.sohag-univ.edu.eg\/main\/wp-content\/uploads\/2013\/01\/girls-top.net_1354646589_751.jpeg",851,315,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 Final exam. Of ore petrology and applied sedimentology for 4th year geology students 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 and environment of deposition, explain this and give…","_links":{"self":[{"href":"https:\/\/sci.sohag-univ.edu.eg\/main\/wp-json\/wp\/v2\/posts\/2506","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=2506"}],"version-history":[{"count":1,"href":"https:\/\/sci.sohag-univ.edu.eg\/main\/wp-json\/wp\/v2\/posts\/2506\/revisions"}],"predecessor-version":[{"id":2508,"href":"https:\/\/sci.sohag-univ.edu.eg\/main\/wp-json\/wp\/v2\/posts\/2506\/revisions\/2508"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/sci.sohag-univ.edu.eg\/main\/wp-json\/wp\/v2\/media\/2507"}],"wp:attachment":[{"href":"https:\/\/sci.sohag-univ.edu.eg\/main\/wp-json\/wp\/v2\/media?parent=2506"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sci.sohag-univ.edu.eg\/main\/wp-json\/wp\/v2\/categories?post=2506"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sci.sohag-univ.edu.eg\/main\/wp-json\/wp\/v2\/tags?post=2506"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}