{"id":10382,"date":"2025-10-30T10:25:04","date_gmt":"2025-10-30T09:25:04","guid":{"rendered":"https:\/\/serveiseducatius.xtec.cat\/cda-valldeboi\/?p=10382"},"modified":"2025-10-30T12:07:56","modified_gmt":"2025-10-30T11:07:56","slug":"el-color-roi-de-la-vall-de-llubriqueto","status":"publish","type":"post","link":"https:\/\/serveiseducatius.xtec.cat\/cda-valldeboi\/general\/el-color-roi-de-la-vall-de-llubriqueto\/","title":{"rendered":"El color “roi” de la vall de Llubriqueto"},"content":{"rendered":"\n

Aquesta setmana hem tingut d’estada els alumnes de segon del CFGS de Gesti\u00f3 Forestal i del Medi Natural de l\u2019Institut d’horticultura i jardinera de Reus, i una de les activitats estrella ha estat la ruta d\u2019interpretaci\u00f3 del paisatge des de Caldes de Bo\u00ed fins a l\u2019Estany Roi. Aquest llac est\u00e0 al terme municipal de la Vall de Bo\u00ed, a la comarca de l\u2019Alta Ribagor\u00e7a, i dins la zona perif\u00e8rica del Parc Nacional d’Aig\u00fcestortes. Aquest llac, d\u2019origen glacial, est\u00e0 situats a 2.305 metres d\u2019altitud, al sector sud-occidental de la Vall de Llubriqueto.<\/p>\n\n\n\n

\"\"<\/a>
Estany Roi<\/figcaption><\/figure>\n\n\n\n

Durant la jornada hem pogut observar la geomorfologia glacial de la zona, hem pogut estudiar els diferents estatges de vegetaci\u00f3 i hem gaudit del mosaic de colors que en aquestes dates ens ofereix el bosc de caducifoli.<\/p>\n\n\n\n

\"\"<\/a><\/figure>\n\n\n\n

Per\u00f2 el m\u00e9s interessant d’aquesta ruta \u00e9s la geologia. \u00c9s una zona on hi ha diversos tipus de roques metam\u00f2rfiques afectades per la intrusi\u00f3 dels granits del plut\u00f3 de la Maladeta al final de l’orog\u00e8nia Herciniana. L’estany Roi est\u00e0 just a la zona on les roques encaixants han estat afectades pel metamorfisme de contacte.<\/p>\n\n\n\n

L’aur\u00e8ola t\u00e8rmica va transformar les pissarres silurianes en cornubianites, roques molt m\u00e9s dures i compactes, sense la foliaci\u00f3 t\u00edpica de les pissarres originals. Probablement, els sediments prehercinians eren rics en ferro dipositat en ambients reductors, fet que explicaria la pres\u00e8ncia de sulfurs (com la pirita) i, per oxidaci\u00f3, d\u2019\u00f2xids i hidr\u00f2xids de ferro (goethita, hematites…). Aquests minerals oxidats donen el color rogenc caracter\u00edstic de moltes roques de la zona i fins i tot tenyeixen els granits del barranc aig\u00fces avall, on l\u2019aigua diposita els productes d\u2019oxidaci\u00f3 del ferro. <\/p>\n\n\n\n

Els top\u00f2nims dels accidents geogr\u00e0fics d’aquest cul de vall ens donen pistes d’aquesta mineralogia: estany Roi, pic Roi, pic del Ferro, coll de Ferranui…<\/p>\n\n\n\n

\n
\"\"<\/a>
pic del Ferro, des de la vall de Llubriqueto<\/figcaption><\/figure>\n\n\n\n
\"\"<\/a>
Barranc de l’estany Roi<\/figcaption><\/figure>\n<\/figure>\n\n\n\n

Hem contrastat aquesta dada fent un an\u00e0lisi del contingut en ferro de les aig\u00fces que discorren pel Pla de la Cabana de Llubriqueto, i efectivament, hem mesurat una concentraci\u00f3 de 0,1mg\/l d’ions de ferro en aquest indret, cosa que seria impossible si l’aigua no hagu\u00e9s passat pel substrat anteriorment descrit.<\/p>\n\n\n\n

\"\"<\/a><\/figure>\n\n\n\n

Una gran jornada de treball. Hem fet una ruta per un indret excepcional per observar processos de metamorfisme de contacte i fer un viatge en el temps de m\u00e9s de 300 milions d’anys.\u2764\ufe0f<\/p>\n\n\n\n

\"\"<\/a><\/figure>\n\n\n\n

<\/p>\n","protected":false},"excerpt":{"rendered":"

Aquesta setmana hem tingut d’estada els alumnes de segon del CFGS de Gesti\u00f3 Forestal i del Medi Natural de l\u2019Institut […]<\/p>\n","protected":false},"author":1,"featured_media":10384,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","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":"set","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 center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[262,342,1,29],"tags":[],"class_list":["post-10382","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-activitats","category-aprendreambelscampsientorns","category-general","category-portada"],"post_mailing_queue_ids":[],"_links":{"self":[{"href":"https:\/\/serveiseducatius.xtec.cat\/cda-valldeboi\/wp-json\/wp\/v2\/posts\/10382","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/serveiseducatius.xtec.cat\/cda-valldeboi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/serveiseducatius.xtec.cat\/cda-valldeboi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/serveiseducatius.xtec.cat\/cda-valldeboi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/serveiseducatius.xtec.cat\/cda-valldeboi\/wp-json\/wp\/v2\/comments?post=10382"}],"version-history":[{"count":6,"href":"https:\/\/serveiseducatius.xtec.cat\/cda-valldeboi\/wp-json\/wp\/v2\/posts\/10382\/revisions"}],"predecessor-version":[{"id":10397,"href":"https:\/\/serveiseducatius.xtec.cat\/cda-valldeboi\/wp-json\/wp\/v2\/posts\/10382\/revisions\/10397"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/serveiseducatius.xtec.cat\/cda-valldeboi\/wp-json\/wp\/v2\/media\/10384"}],"wp:attachment":[{"href":"https:\/\/serveiseducatius.xtec.cat\/cda-valldeboi\/wp-json\/wp\/v2\/media?parent=10382"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/serveiseducatius.xtec.cat\/cda-valldeboi\/wp-json\/wp\/v2\/categories?post=10382"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/serveiseducatius.xtec.cat\/cda-valldeboi\/wp-json\/wp\/v2\/tags?post=10382"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}