{"id":62821,"date":"2008-08-02T00:00:00","date_gmt":"2008-08-02T00:00:00","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/caracterizacion-mineralogica-geoqua%c2%admica-y-petrogenticas-de-las-pegmatitas-grana%c2%adticas-de-giraul-namibe-angola\/"},"modified":"2008-08-02T00:00:00","modified_gmt":"2008-08-02T00:00:00","slug":"caracterizacion-mineralogica-geoqua%c2%admica-y-petrogenticas-de-las-pegmatitas-grana%c2%adticas-de-giraul-namibe-angola","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/mineralogia\/caracterizacion-mineralogica-geoqua%c2%admica-y-petrogenticas-de-las-pegmatitas-grana%c2%adticas-de-giraul-namibe-angola\/","title":{"rendered":"Caracterizaci\u00f3n mineral\u00f3gica, geoqu\u00edmica y petrog\u00e9nticas de las pegmatitas gran\u00edticas de gira\u00fal, namibe angola"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Olimpio Gon\u00c1\u00a7alves Antonio <\/strong><\/h2>\n<p>Las pegmat\u00edtas del campo de gira\u00fal, namibe (sw de angola) encajan en series metapel\u00edticas o metabas\u00edticas del arcaico superior.Las rocas metam\u00f3rficas se encuentran afectadas por la orogenia eburneana, formando pliegues muy apretados de direcci\u00f3n nw-sey vergencia al sw, que tienen desarrollada esquistosidad de plano axial; los materiales se encuentran afectados por metamorfismoregional, s\u00edntect\u00f3ni.Co con esta deformaci\u00f3n, en la facies de las anfibolitas.Una suite de rocas intrusivas de edad eburneano tard\u00edo (2230 \u00c2\u00b1 48 ma mediante isocrona con sm\/nd; edades discordantes de 1795\u00c2\u00b141 ma y 172812.5 ma mediante u\/pb) se emplazan coincidiendo con los estadios defonnativos p\u00f3stumos, y est\u00e1n poco o nadadeformados. Comprenden, por orden decreciente de edad, piroxenitas, hornblenditas, gabronoritas, dioritas, tonalitas, granodioritas,leucogranitos s\u00eden\u00edticos y leucomonzogranitos, as\u00ed como pegmatitas gran\u00edticas. Por sus caracter\u00edsticas geoqu\u00edmicas puedenclasificarse como granitos de tipo 1 calcoalcalinos, asociados a un contexto de arcos de islas volc\u00e1nicas, si bien en los leucogranitossu mineralog\u00eda, composici\u00f3n peralum\u00edmca e is\u00f3topos radiog\u00e9nicos (snd(t)= &#8211; 2,217) denotan un elevado grado de contaminaci\u00f3ncrustal.Se han diferenciado, en base a criterios de composici\u00f3n mineral y de estructura interna, cinco tipos de pegmatitas (1, ii,111, iv y v).Corresponden a la clase lct.Eltipo 1 (est\u00e9ril) es el \u00fanico que est\u00e1 confinado a los leucogranitos y cuyo contacto con \u00e9stos es gradual; presenta una estructuraconc\u00e9ntrica sencilla, con dos zonas intermedias (que pueden contener berilo) y un n\u00facleo de cuarzo, a veces rosado, de calidadgemol\u00f3gica. Los m\u00e1s sencillas (tipo 1) a las m\u00e1s complejas (tipo v). La moscovita, adem\u00e1s, se enriquece en el mismo sentido en f,li, ta, sn. En el granate hay un neto enriquecimiento en mn y depresi\u00f3n en mg en el mismo sentido, en el circ\u00f3n es deenriquecimiento en hf, en la columbita-tantalita, en ta, y en la turmalin<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Caracterizaci\u00f3n mineral\u00f3gica, geoqu\u00edmica y petrog\u00e9nticas de las pegmatitas gran\u00edticas de gira\u00fal, namibe angola<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Caracterizaci\u00f3n mineral\u00f3gica, geoqu\u00edmica y petrog\u00e9nticas de las pegmatitas gran\u00edticas de gira\u00fal, namibe angola <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Olimpio Gon\u00c1\u00a7alves Antonio <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Zaragoza<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 08\/02\/2008<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Direcci\u00f3n y tribunal<\/h3>\n<ul>\n<li><strong>Director de la tesis<\/strong>\n<ul>\n<li>Andres Paniagua Condado<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: Antonio Arribas moreno <\/li>\n<li>salvador Gal\u00ed medina (vocal)<\/li>\n<li>robert Martin (vocal)<\/li>\n<li>i\u00f1aki Yusta arnal (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Olimpio Gon\u00c1\u00a7alves Antonio Las pegmat\u00edtas del campo de gira\u00fal, namibe (sw de angola) encajan en series metapel\u00edticas [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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