{"id":142399,"date":"2026-04-16T23:16:51","date_gmt":"2026-04-16T23:16:51","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/mineralogia-petrologia-y-geoquimica-de-litologias-manganesiferas-del-macizo-iberico-meridional-sw-de-espana\/"},"modified":"2026-04-16T23:16:51","modified_gmt":"2026-04-16T23:16:51","slug":"mineralogia-petrologia-y-geoquimica-de-litologias-manganesiferas-del-macizo-iberico-meridional-sw-de-espana","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/ciencias-de-la-tierra-y-del-espacio\/mineralogia-petrologia-y-geoquimica-de-litologias-manganesiferas-del-macizo-iberico-meridional-sw-de-espana\/","title":{"rendered":"Mineralogia, petrolog\u00eda y geoquimica de litolog\u00edas manganesiferas del macizo iberico meridional (sw de espa\u00f1a)."},"content":{"rendered":"<h2>Tesis doctoral de <strong> Juan Jimenez Millan <\/strong><\/h2>\n<p>Se han estudiado las rocas con mn del macizo de aracena y la unidad de cumbres-hinojales (zona de ossa-morena, macizo iberico). En el area de aracena, se han distinguido: 1) litolog\u00edas carbonaticas con lechos peliticos con hematites; 2) litolog\u00edas carbonaticas con nodulos de braunita; 3) litolog\u00edas carbonaticas con nodulos de hausmannita; 4) litolog\u00edas carbonaticas con lechos de actinolita; y 5) tobas cristalinas. Se han observado dos etapas de metamorfismo que ocurrieron en un intervalo de temperatura entre 400 y 500 grados c. En el area de oliva de la frontera se han diferenciado: 1) tobas cristalinas manganesiferas; 2) pizarras manganesiferas; 3) niveles ricos en braunita; 4) coticulas (cuarcitas espesartinicas); 5) rocas con piroxenoide, tefroita. El limite inferior del metamorfismo estuvo en torno a 400 grados c. La presencia de piemontita esta controlada por las condiciones de fugacidad de oxigeno, y la presencia de piroxenoides y tefroita es principalmente funcion de la composicion global de las rocas (razones si\/(mn+fe) bajas). El tratamiento estadistico mediante analisis de componentes principales y analisis de correspondencias corrobora estas tendencias. Las variaciones en el contenido en fe2+ de los minerales del grupo del olivino y de las espinelas, y el contenido en mn3+ de la braunita estan directamente relacionadas con las variaciones de los contenidos en fe y mn, respectivamente, de la roca. El incremento de las condiciones de fo2 favorece el enriquecimiento en mn3+ de las epidotas pero la cristalizacion de braunita produce una inversion de esta tendencia debido al fuerte fraccionamiento ejercido por la braunita sobre el mn3+. En ausencia de tefroita se favorece el enriquecimiento en fe2+ de la piroxmangita y del granate. Las razones extremadamente altas de mn\/fe, los bajos contenidos en co, cu ni y tierras raras de las rocas de aracena son similares a los contenidos de los depositos hidrotermales. El tratamiento e<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Mineralogia, petrolog\u00eda y geoquimica de litolog\u00edas manganesiferas del macizo iberico meridional (sw de espa\u00f1a).<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Mineralogia, petrolog\u00eda y geoquimica de litolog\u00edas manganesiferas del macizo iberico meridional (sw de espa\u00f1a). <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Juan Jimenez Millan <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Granada<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 01\/01\/1993<\/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>Nicolas Velilla Sanchez<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: Manuel Rodr\u00edguez Gallego <\/li>\n<li>Francisco Velasco Roldan (vocal)<\/li>\n<li>Rafael Arana Castillo (vocal)<\/li>\n<li> Fernandez Soler Juan  Manuel (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Juan Jimenez Millan Se han estudiado las rocas con mn del macizo de aracena y la unidad [&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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