{"id":2513,"date":"2013-01-28T10:30:57","date_gmt":"2013-01-28T10:30:57","guid":{"rendered":"http:\/\/www.sohag-univ.edu.eg\/facsci\/?p=2513"},"modified":"2013-01-28T10:46:19","modified_gmt":"2013-01-28T10:46:19","slug":"%d8%a7%d9%85%d8%aa%d8%ad%d8%a7%d9%86-%d8%a7%d9%84%d9%81%d8%b1%d9%82%d8%a9-%d8%a7%d9%84%d8%b1%d8%a7%d8%a8%d8%b9%d8%a9-%d9%84%d9%84%d8%ac%d9%8a%d9%88%d9%84%d9%88%d8%ac%d9%8a%d8%a7-ore-petrology","status":"publish","type":"post","link":"https:\/\/sci.sohag-univ.edu.eg\/main\/%d8%a7%d9%85%d8%aa%d8%ad%d8%a7%d9%86-%d8%a7%d9%84%d9%81%d8%b1%d9%82%d8%a9-%d8%a7%d9%84%d8%b1%d8%a7%d8%a8%d8%b9%d8%a9-%d9%84%d9%84%d8%ac%d9%8a%d9%88%d9%84%d9%88%d8%ac%d9%8a%d8%a7-ore-petrology\/","title":{"rendered":"\u0627\u0645\u062a\u062d\u0627\u0646 \u0627\u0644\u0641\u0631\u0642\u0629 \u0627\u0644\u0631\u0627\u0628\u0639\u0629 \u0644\u0644\u062c\u064a\u0648\u0644\u0648\u062c\u064a\u0627 Ore Petrology"},"content":{"rendered":"<p>Ore Petrology<\/p>\n<div><\/div>\n<p>1- Explain briefly (with illustrations) :\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026(20 marks)<\/p>\n<p>A) The petrological interrelationships of ore minerals in the following ore deposits: (15 marks)<br \/>\n1) Fe-Ti oxide deposits.<br \/>\n2) Fe- Cu-Ni sulfide deposits.<br \/>\n3) Alpine-type chromite deposits.<br \/>\nB) The method of Sharpe et al (1985) of arsenopyrite geothermometry. (5 marks)<\/p>\n<p>2-Choose the correct answer (10 marks)<br \/>\na- Growth of sulfide minerals in lavas takes place in the form of (skeletal crystals &#8211; round droplets &#8211; euhedral to subhedral crystals).<\/p>\n<p>b- The tubular disconcordant orebodies are characterized by (pinch and swell structure &#8211; branching and anastomosing &#8211; stockworks).<\/p>\n<p>c- (Stratiform \u2013 Starabound \u2013 Disseminated) deposits show a considerable development parallel to bedding and a limited development perpendicular to it.<\/p>\n<p>d- Diamond deposits in kimberlite represent (concordant orebodies- discordant orebodies- residual orebodies).<\/p>\n<p>e- Replacement of magnetite by martite is carried out through (change in oxidation state &#8211; change in anions &#8211; selective remove of one cation).<\/p>\n<p>4- Put (\uf0d6) after the true statement and (X) after the false one in the following: (10 marks)<br \/>\na-Rounding-off of wall-rock surfaces on both sides of a mineral deposit within a fracture indicates its formation by open space deposition. ( ).<\/p>\n<p>b- Starabound orebodies are restricted to a particular part of the stratigraphic column, regardless whether the orebody is concordant or discordant ( ).<\/p>\n<p>c- &#8220;Pinch and swell structure&#8221; results from later replacement of fracture walls ( ).<\/p>\n<p>d- Layered chromite deposits are formed in tectonically unstable environments while podiform ones are formed in tectonically stable conditions ( ).<\/p>\n<p>e- Metamorphic fluids are produced by break down of hydrous silicate and carbonate minerals at the transition from greenscist to amphipolite facies.<\/p>\n<p>5- Complete the missing parts in the following statements (5 marks):<br \/>\na- \u2026\u2026\u2026\u2026 results from deformation of crustified veins during or after ore formation.<br \/>\nb- The exsolution type in which structures of both phases are completely different or without crystallographic continuity across the interface between phases is called\u2026\u2026\u2026\u2026\u2026\u2026..<br \/>\nc- Experimental work showed that chalcopyrite disease is not an exsolution, so it is most propably to be\u2026\u2026\u2026\u2026\u2026\u2026\u2026<br \/>\nd- \u2026\u2026\u2026. are generally stratiform lenticular or sheetlike orebodies developed at interfaces or horizons of pauses in volcanism or change from volcanism to sedimentation.<br \/>\ne- In Ag-Bi-Co-Ni-As vein deposits, \u2026\u2026\u2026\u2026is petrologically found in dendritic patterns that are surrounded by rosettes of colloform arsenides.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ore Petrology 1- Explain briefly (with illustrations) :\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026(20 marks) A) The petrological interrelationships of ore minerals in the following ore deposits: (15 marks) 1) Fe-Ti oxide deposits. 2) Fe- Cu-Ni [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2514,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18],"tags":[],"class_list":["post-2513","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>\u0627\u0645\u062a\u062d\u0627\u0646 \u0627\u0644\u0641\u0631\u0642\u0629 \u0627\u0644\u0631\u0627\u0628\u0639\u0629 \u0644\u0644\u062c\u064a\u0648\u0644\u0648\u062c\u064a\u0627 Ore Petrology - \u0643\u0644\u064a\u0629 \u0627\u0644\u0639\u0644\u0648\u0645<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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