{"id":19305,"date":"2024-02-22T15:29:50","date_gmt":"2024-02-22T14:29:50","guid":{"rendered":"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/?p=19305"},"modified":"2024-02-22T15:32:04","modified_gmt":"2024-02-22T14:32:04","slug":"la-serra-de-collserola-vista-des-del-puig-dolorda","status":"publish","type":"post","link":"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/general\/la-serra-de-collserola-vista-des-del-puig-dolorda\/","title":{"rendered":"La serra de Collserola vista des del Puig d&#8217;Olorda"},"content":{"rendered":"<p>Aquest dimecres 14 de febrer de 2024 l&#8217;alumnat de l&#8217;assignatura de Geologia i Ci\u00e8ncies Ambientals de 1r de batxillerat dels instituts <a href=\"https:\/\/agora.xtec.cat\/ies-espriu\/\">Salvador Espriu <\/a>i <a href=\"https:\/\/agora.xtec.cat\/insfortpius\/\">Fort Pius<\/a> de Barcelona han realitzat l\u2019<a href=\"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/ambits\/geologia\/itinerari-geologic-al-voltant-de-santa-creu-dolorda\/\" target=\"_blank\" rel=\"noopener noreferrer\">itinerari geol\u00f2gic de Santa Creu d\u2019Olorda<\/a>.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-19308 alignleft\" src=\"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-content\/uploads\/usu1385\/2024\/02\/1-10.jpg\" alt=\"\" width=\"380\" height=\"285\" srcset=\"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-content\/uploads\/usu1385\/2024\/02\/1-10.jpg 300w, https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-content\/uploads\/usu1385\/2024\/02\/1-10-200x150.jpg 200w\" sizes=\"auto, (max-width: 380px) 100vw, 380px\" \/>El seu trajecte, partint des de l&#8217;escola Virolai, ha estat constitu\u00eft per 7 parades en les que es han pogut observar diferents afloraments geol\u00f2gics destacables de la zona. Els\/les alumnes, que han treballat la composici\u00f3 i propietats tant de les roques metam\u00f2rfiques com de les roques sediment\u00e0ries, han posat en pr\u00e0ctica diferents t\u00e8cniques de camp per interpretar els processos de meteoritzaci\u00f3, erosi\u00f3, transport, sedimentaci\u00f3, deformaci\u00f3 i metamorfitzaci\u00f3 que han patit les diferents roques. Tamb\u00e9 han utilitzat diferents t\u00e8cniques per mesurar la pot\u00e8ncia d&#8217;alguns dels afloraments.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignright wp-image-19309\" src=\"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-content\/uploads\/usu1385\/2024\/02\/2-9.jpg\" alt=\"\" width=\"370\" height=\"278\" srcset=\"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-content\/uploads\/usu1385\/2024\/02\/2-9.jpg 300w, https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-content\/uploads\/usu1385\/2024\/02\/2-9-200x150.jpg 200w\" sizes=\"auto, (max-width: 370px) 100vw, 370px\" \/>A la<strong> primera parada<\/strong> i a la<strong> segona parada<\/strong> han estat a \u201cLa masia de Can Farr\u00e9s\u201d, on han descobert f\u00f2ssils de crino\u00efdeus en la roca calc\u00e0ria del cobert prop de la masia, i a l&#8217;antiga Font de Can Farr\u00e9s, on han dedu\u00eft la formaci\u00f3 d\u2019aq\u00fc\u00edfers captius i lliures amb els seus nivells piezom\u00e8trics associats.<\/p>\n<p>Han continuat l\u2019itinerari fins a un\u00a0<a href=\"https:\/\/www.santfeliu.cat\/go.faces?topic=punt6\" target=\"_blank\" rel=\"noopener noreferrer\">espectacular plec anticlinal amb encavalcament<\/a> de grans dimensions que il\u00b7lustra com actuen les forces de compressi\u00f3 i que formava part de la<strong> tercera parada<\/strong>.<\/p>\n<p>A la<strong> quarta parada<\/strong> han observat fen\u00f2mens que es produeixen localment als vessants, com ara la formaci\u00f3 de solcs i xaragalls que es formen quan l\u2019aigua de la pluja arrossega i erosiona el terra. Les &#8220;<em>badlands<\/em>&#8221; s\u00f3n grans extensions de terra on t\u00e9 lloc aquest fen\u00f2men.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-19311 alignleft\" src=\"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-content\/uploads\/usu1385\/2024\/02\/4-2-225x300.jpg\" alt=\"\" width=\"273\" height=\"364\" srcset=\"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-content\/uploads\/usu1385\/2024\/02\/4-2-225x300.jpg 225w, https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-content\/uploads\/usu1385\/2024\/02\/4-2.jpg 300w\" sizes=\"auto, (max-width: 273px) 100vw, 273px\" \/>A la<strong> cinquena parada<\/strong> han accedit a &#8220;La cova d\u2019Or&#8221;, un conjunt de blocs fracturats dins les calc\u00e0ries on es poden apreciar fen\u00f2mens c\u00e0rstics i una gran quantitat de f\u00f2ssils del Paleozoic.<\/p>\n<p>En la<strong> sisena parada<\/strong> han pujat fins al Puig d\u2019Olorda, i des d\u2019all\u00e0, gr\u00e0cies a una excel\u00b7lent panor\u00e0mica, han pogut interpretar el paisatge litoral, prelitoral i el delta del Llobregat. Tamb\u00e9 han analitzat les roques calc\u00e0ries del cim.<\/p>\n<p>Han acabat el seu itinerari a la <em>Pedrera dels ocells<\/em>, una antiga mina de pissarres amb carbons del Siluri\u00e0. En aquesta<strong> setena parada<\/strong> han pogut constatar que aquest aflorament de pissarres bituminoses va deixar d&#8217;exercir com a amfiteatre degut a un despreniment de dimensions considerables.<\/p>\n<p>El recorregut ha estat llarg per\u00f2 l&#8217;alumnat i el professorat sempre han estat animats i motivats. Heu fet una gran tasca, fins la propera!<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Aquest dimecres 14 de febrer de 2024 l&#8217;alumnat de l&#8217;assignatura de Geologia i Ci\u00e8ncies Ambientals de 1r de batxillerat dels instituts Salvador Espriu i Fort Pius de Barcelona han realitzat l\u2019itinerari geol\u00f2gic de Santa Creu d\u2019Olorda. El seu trajecte, partint des de l&#8217;escola Virolai, ha estat constitu\u00eft per 7 parades en les que es han [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":19310,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"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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