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<article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">RUDN Journal of Engineering Research</journal-id><journal-title-group><journal-title xml:lang="en">RUDN Journal of Engineering Research</journal-title><trans-title-group xml:lang="ru"><trans-title>Вестник Российского университета дружбы народов. Серия: Инженерные исследования</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2312-8143</issn><issn publication-format="electronic">2312-8151</issn><publisher><publisher-name xml:lang="en">Peoples’ Friendship University of Russia named after Patrice Lumumba (RUDN University)</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">20604</article-id><article-id pub-id-type="doi">10.22363/2312-8143-2018-19-4-537-551</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Innovative use of mineral resources</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Геология и недропользование</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Mineral composition, textures and gold habit of the Hamama mineralizations (Central Eastern Desert of Egypt)</article-title><trans-title-group xml:lang="ru"><trans-title>Минеральный состав, текстура и формы золотой минерализации Хамама (центральная часть Восточной пустыни Египта)</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Mahmoud</surname><given-names>Abdelhalim S</given-names></name><name xml:lang="ru"><surname>Махмуд</surname><given-names>Абделхалим С</given-names></name></name-alternatives><bio xml:lang="en"><p>PhD student, Sergo Ordzhonikidzе Russian State Geological Prospecting University (MGRI-RSGPU). Teaching assistant, Geology Department, Faculty of Science, Fayoum University</p></bio><bio xml:lang="ru"><p>аспирант, Российский государственный геологоразведочный университет имени Серго Орджоникидзе (МГРИ-РГГРУ). Ассистент кафедры геологии факультета естественных наук, Университет Фаюма (Египет).</p></bio><email>halim.geologist@mail.ru</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Dyakonov</surname><given-names>Viktor V</given-names></name><name xml:lang="ru"><surname>Дьяконов</surname><given-names>Виктор Васильевич</given-names></name></name-alternatives><bio xml:lang="en"><p>Doctor of Science in Geology, Professor, Head of Department of the general geology and geomapping</p></bio><bio xml:lang="ru"><p>доктор геолого-минералогических наук, профессор, заведующий кафедрой общей геологии и геокартирования</p></bio><email>mdf.rudn@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Dawoud</surname><given-names>Maher I</given-names></name><name xml:lang="ru"><surname>Давуд</surname><given-names>Махер И</given-names></name></name-alternatives><bio xml:lang="en"><p>Professor, Professor of Mineralogy, Petrology, Geochemistry and Ore Deposits, Geology Department, Faculty of Science</p></bio><bio xml:lang="ru"><p>профессор, профессор минералогии, петрологии и полезных ископаемых кафедры геологии факультета естественных наук</p></bio><email>Dawoud_99@yahoo.com</email><xref ref-type="aff" rid="aff3"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kotelnikov</surname><given-names>Alexander E</given-names></name><name xml:lang="ru"><surname>Котельников</surname><given-names>Александр Евгеньевич</given-names></name></name-alternatives><bio xml:lang="en"><p>PhD in Geology, Assistant Professor, Department of Mineral Developing and Oil &amp; Gas Engineering, Engineering Academy</p></bio><bio xml:lang="ru"><p>кандидат геолого-минералогических наук, доцент департамента недропользования и нефтегазового дела Инженерной академии</p></bio><email>kotelnikov-ae@rudn.ru</email><xref ref-type="aff" rid="aff4"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Sergo Ordzhonikidzе Russian State Geological Prospecting University (MGRI-RSGPU)</institution></aff><aff><institution xml:lang="ru">Российский государственный геологоразведочный университет им. С. Орджоникидзе</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Fayoum University</institution></aff><aff><institution xml:lang="ru">Университет Фаюма</institution></aff></aff-alternatives><aff-alternatives id="aff3"><aff><institution xml:lang="en">Minufiya University</institution></aff><aff><institution xml:lang="ru">Университет Менуфии</institution></aff></aff-alternatives><aff-alternatives id="aff4"><aff><institution xml:lang="en">Peoples’ Friendship University of Russia (RUDN University)</institution></aff><aff><institution xml:lang="ru">Российский университет дружбы народов</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2018-12-15" publication-format="electronic"><day>15</day><month>12</month><year>2018</year></pub-date><volume>19</volume><issue>4</issue><issue-title xml:lang="en">VOL 19, NO4 (2018)</issue-title><issue-title xml:lang="ru">ТОМ 19, №4 (2018)</issue-title><fpage>537</fpage><lpage>551</lpage><history><date date-type="received" iso-8601-date="2019-02-24"><day>24</day><month>02</month><year>2019</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2018, Mahmoud A.S., Dyakonov V.V., Dawoud M.I., Kotelnikov A.E.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2018, Махмуд А.S., Дьяконов В.В., Давуд М.I., Котельников А.Е.</copyright-statement><copyright-year>2018</copyright-year><copyright-holder xml:lang="en">Mahmoud A.S., Dyakonov V.V., Dawoud M.I., Kotelnikov A.E.</copyright-holder><copyright-holder xml:lang="ru">Махмуд А.S., Дьяконов В.В., Давуд М.I., Котельников А.Е.</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">http://creativecommons.org/licenses/by/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://journals.rudn.ru/engineering-researches/article/view/20604">https://journals.rudn.ru/engineering-researches/article/view/20604</self-uri><abstract xml:lang="en"><p>Mineralization in the Hamama area exists mainly as quartz-carbonate veins, extending along the contact between the footwall volcanics (basalt, dacite, and rhyolite) and the hanging wall volcaniclastics (laminated, massive and lapilli tuffs with minor breccia). Also, mineralization was recorded as low mineralized cavity filling dolomitic veins occupying NW-SE faults in the basalt. The principal mineralization is represented by a mineral association - quartz + dolomite + calcite + pyrite + chalcopyrite + sphalerite with varying amounts of barite, cinnabar, and galena. It is suggested that these carbonates are post-tectonic low-temperature hydrothermal solution (exhalations) filling fault zones. The injected mineralized carbonate solution dissolved the silicate minerals along contacts. This fault system was caused by the group of porphyritic rhyolite dykes extending NE-SW. The carbonates then were subjected to digenetic processes after their formation resulted in the formation of some secondary sedimentary textures (for example spherulitic, colloform and cockade textures) and dolomitization. The mineralized carbonates are rich in Zn, Cu, and occasionally Pb and Sb. The cavity filling dolomitic veins within basalt show low concentration of ore minerals. The pyrite was crystallized in four phases; the first phase is well-developed pyrite that was formed from the primary hydrothermal solution. The role of bacterial action is obvious in the formation of a second phase framboidal pyrite. The third phase represented by atoll structures formed by diagenetic reworking of the framboidal pyrite. The last phase of pyrite crystallization appears as fine skeletal grains mostly attached to sericite alteration of altered volcanics. The gold and silver are concentrated mainly in the upper iron cap. Secondary supergene enrichment of gold in the oxidation zone, especially in Hamama western zone, is indicated by the reprecipitation of gold as thin filaments or rounded nano-grains along cracks of the oxidized pyrite or at the periphery of the pyrite relicts.</p></abstract><trans-abstract xml:lang="ru"><p>Минерализация в районе Хамама (Hamama) представлена преимущественно в виде кварцкарбонатных жил, простирающихся вдоль контакта между лежачим боком вулканогенных пород (базальты, дациты и риолиты) и висячим блоком вулканогенно-осадочных пород (слоистые, массивные и лапиллиевые туфы с небольшим количеством брекчий). Также минерализация отмечена в виде слабо минерализованных доломитовых жил, заполняющих трещины северо-западного - южно-восточного простирания в базальтах. Основную минерализацию можно описать через минеральную ассоциацию - кварц + доломит + кальцит + пирит + халькопирит + сфалерит с различным количеством барита, киновари и галенита. Предположительно, эти карбонатные породы образовались из посттектонических низкотемпературных гидротермальных растворов (эманации газа из магмы), заполняющих зоны разломов. Привносимые минерализованные карбонатные растворы преобразовали кремнистые породы вдоль контакта. Система разломов сформировалась за счет внедрения риолит-порфировых даек северо-восточного простирания. Карбонатные породы подверглись дигенетическим процессам, что привело к появлению некоторых вторичных осадочных текстур (например, сферолитовой, колломорфной и кокардовой) и доломитизации. Минерализованные карбонатные породы обогащены цинком, медью и реже свинцом и сурьмой. Доломитовые жилы, заполняющие трещины, обладают низким содержанием рудных минералов. Кристаллизация пирита - четырехфазная. Первая фаза - хорошо раскристаллизованный пирит, появившийся из первичного гидротермального раствора. Жизнедеятельность бактерий обусловила формирование второй фазы - фрамбоидного пирита. Третья фаза (с кольцеобразной структурой) образовалась за счет диагенетической перестройки фрамбоидного пирита. Последняя фаза кристаллизации пирита проявляется в виде тонкого скелетного зерна, главным образом прикрепленного к серицитизации измененных вулканических пород. Золото и серебро сконцентрированы в основном в верхней чести «железной шляпы». Вторичное гипергенное обогащение золота в зоне окисления, особенно в западной зоне Хамама (Hamama), представлено переотложенным золотом в виде тонких нитеобразных или округлых нанозерен, расположенных вдоль трещин окисленного пирита или по периферии реликтов пирита.</p></trans-abstract><kwd-group xml:lang="en"><kwd>Hamama</kwd><kwd>quartz-carbonate veins</kwd><kwd>hydrothermal</kwd><kwd>framboids</kwd><kwd>supergene enrichment</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>Хамама</kwd><kwd>кварц-карбонатные жилы</kwd><kwd>гидротермальный</kwd><kwd>фрамбоиды</kwd><kwd>гипергенное обогащение</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><citation-alternatives><mixed-citation xml:lang="en">Bennett J., Mosley P. Tiered-tectonics and evolution, Eastern Desert and Sinai, Egypt. Colloquium on African geology, 1987, 14, 79-82.</mixed-citation><mixed-citation xml:lang="ru">Bennett J., Mosley P. 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