{"id":2093,"date":"2025-06-06T15:35:00","date_gmt":"2025-06-06T13:35:00","guid":{"rendered":"https:\/\/agora.xtec.cat\/iesilladerodes\/?p=2093"},"modified":"2025-07-04T15:37:19","modified_gmt":"2025-07-04T13:37:19","slug":"sortida-de-geologia","status":"publish","type":"post","link":"https:\/\/agora.xtec.cat\/iesilladerodes\/general\/sortida-de-geologia\/","title":{"rendered":"Sortida de Geologia"},"content":{"rendered":"\n<figure class=\"wp-block-image alignleft size-full\"><a href=\"https:\/\/agora.xtec.cat\/iesilladerodes\/wp-content\/uploads\/usu2146\/2025\/07\/geo.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"563\" height=\"750\" src=\"https:\/\/agora.xtec.cat\/iesilladerodes\/wp-content\/uploads\/usu2146\/2025\/07\/geo.jpg\" alt=\"\" class=\"wp-image-2094\" srcset=\"https:\/\/agora.xtec.cat\/iesilladerodes\/wp-content\/uploads\/usu2146\/2025\/07\/geo.jpg 563w, https:\/\/agora.xtec.cat\/iesilladerodes\/wp-content\/uploads\/usu2146\/2025\/07\/geo-225x300.jpg 225w\" sizes=\"auto, (max-width: 563px) 100vw, 563px\" \/><\/a><\/figure>\n\n\n\n<p>El passat dimarts vam fer una sortida geol\u00f2gica a la franja litoral entre el Far de Roses i la Cala Canyelles, zona catalogada dins l\u2019inventari del Institut Cartogr\u00e0fic i Geol\u00f2gic de Catalunya com a punt d&#8217;Inter\u00e8s Geol\u00f2gic (punt 163 del&nbsp;<a href=\"https:\/\/mediambient.gencat.cat\/ca\/05_ambits_dactuacio\/patrimoni_natural\/patrimoni-geologic\/inventari_despais_dinteres_geologic\/consulta_de_les_fitxes_descriptives_dels_eig\/\">cat\u00e0leg<\/a>) perqu\u00e8 inclou les millors estructures menors associades a una intrusi\u00f3 sintect\u00f2nica d\u2019un granitoide que es poden observar a Catalunya. Per poder fer aquesta activitat vam comptar amb el monitoratge de la professora ge\u00f2loga Montse Veh\u00ed que actualment treballa al Camp d\u2019Aprenentatge d\u2019Emp\u00faries.<\/p>\n\n\n\n<p>La sortida la vam comen\u00e7ar a platja Palangrers per estudiar tamb\u00e9 l\u2019origen de la sorra de la platja a trav\u00e9s d\u2019unes petites observacions amb lupa i experimentacions amb \u00e0cid i imants. Despr\u00e9s vam estudiar la granodiorita ja aflorant a la cala i vam intentar entendre les fases de refredament dels diferents minerals que la composen. Tamb\u00e9 vam comen\u00e7ar a introduir que passa quan aquesta intrusi\u00f3 es produeix al mateix moment que s\u2019hi produeix un increment de pressi\u00f3 degut a esfor\u00e7os tect\u00f2nics.<\/p>\n\n\n\n<p>A partir d\u2019aqu\u00ed ens vam despla\u00e7ar a just abans del far on hi ha una passarel\u00b7la amb una impressionant vista del golf de Roses i vam intentar interpretar el paisatge i la seva formaci\u00f3. Aix\u00ed com les diferents etapes que ha viscut aquesta zona des de fa m\u00e9s de 600 milions d\u2019anys fins a dia d\u2019avui.<\/p>\n\n\n\n<p>Ja a l\u2019entorn del far, vam fer petites experimentacions per entendre com es comporten els minerals quan son sotmesos a esfor\u00e7os, tot observant la impressionant pegmatita i diferents filons d\u2019aplita que es deformen diferencialment a la granodiorita.<\/p>\n\n\n\n<p>Per acabar, ja a sota el far, vam observar diferents estructures de meteoritzaci\u00f3 amb uns impressionants tafoni i erosi\u00f3 alveolar produ\u00efda per l\u2019aigua i la sal en el seu xoc en les roques. En aquest entorn vam observar tamb\u00e9 la important deformaci\u00f3 diferencial entre els enclaus dior\u00edtics que hi ha a la roca i tamb\u00e9 el l\u00edmit molt clarament visible entre una banda de granodiorita milon\u00edtica (a la dreta) i la granodiorita no afectada per la deformaci\u00f3 per cisalla (a l\u2019esquerra)<\/p>\n\n\n\n<p>Aquests afloraments es situen entre els millors exemples a nivell mundial, i a m\u00e9s les bones condicions d&#8217;accessibilitat, fa que es puguin considerar els afloraments de zones de cisalles d&#8217;arreu del mon m\u00e9s visitats per estudiants de Geologia aix\u00ed com per investigadors roques gran\u00edtiques, conseq\u00fc\u00e8ncia de l&#8217;acci\u00f3 erosiva del mar i del vent.<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>El passat dimarts vam fer una sortida geol\u00f2gica a la franja litoral entre el Far de Roses i la Cala [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2094,"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 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