{"id":22027,"date":"2025-01-23T15:40:46","date_gmt":"2025-01-23T14:40:46","guid":{"rendered":"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/?p=22027"},"modified":"2025-02-04T09:41:55","modified_gmt":"2025-02-04T08:41:55","slug":"el-montpedros-puja-lolorda","status":"publish","type":"post","link":"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/general\/el-montpedros-puja-lolorda\/","title":{"rendered":"El Montpedr\u00f3s puja l’Olorda"},"content":{"rendered":"

Dimecres 22 de gener de 2025 l’alumnat de l’assignatura de Geologia i Ci\u00e8ncies Ambientals de 2n de batxillerat de l’Institut Montpedr\u00f3s<\/a> de\u00a0 Santa Coloma de Cervell\u00f3 ha realitzat l’itinerari geol\u00f2gic de Santa Creu d\u2019Olorda<\/a>.<\/p>\n

Aquest itinerari circular est\u00e0 constitu\u00eft per 7 parades en les que es poden observar diferents formacions i afloraments geol\u00f2gics destacables de la zona. En cadascun d’aquests punts, els\/les alumnes 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. A m\u00e9s de treballar la composici\u00f3 i propietats d’algunes roques metam\u00f2rfiques i sediment\u00e0ries, han utilitzat diferents t\u00e8cniques de mesura indirecta per calcular la pot\u00e8ncia d’alguns dels afloraments on tamb\u00e9 han comprovat la pres\u00e8ncia de restes f\u00f2ssils.<\/p>\n

\"\"En primer lloc han visitat un indret molt peculiar, la Pedrera dels ocells<\/em><\/a>, una antiga mina de pissarres amb carbons del Siluri\u00e0. En aquest punt han pogut constatar que aquest aflorament de pissarres bituminoses es va explotar per obtenir betum i adobs. Tamb\u00e9 han observat com l’aigua rica en sulfurs i \u00f2xids de ferro que filtra d’aquest aflorament tenyeix de color ocre el fons de les basses que es van habilitar per recuperar un espai natural on poder observar ocells.<\/p>\n

A continuaci\u00f3 han pujat per una zona boscosa fins al Puig d\u2019Olorda (450m), des d’on, gr\u00e0cies a una excel\u00b7lent panor\u00e0mica, han fet una interpretaci\u00f3 del paisatge prelitoral i litoral. Entre d’altres punts d’inter\u00e8s, han raonat l’origen del mass\u00eds de Montserrat i del Delta del Llobregat, que actualment pateix un fort impacte per l’activitat humana. Tamb\u00e9 han analitzat les roques calc\u00e0ries del cim, clarament diferents de la resta de Collserola, dominada per roques metam\u00f2rfiques.<\/p>\n

\"\"A la seg\u00fcent parada han accedit, equipats amb casc i frontal, a “La cova d\u2019Or”, 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 com una classe d’equinoderms s\u00e8ssils anomenats crino\u00efdeus o lliris de mar.<\/p>\n

Han continuat l\u2019itinerari fins a un\u00a0espectacular plec anticlinal amb encavalcament<\/a> de grans dimensions que il\u00b7lustra com actuen les forces de compressi\u00f3. Es tracta d’un plegament del Devoni\u00e0 que permet estudiar la successi\u00f3 estratigr\u00e0fica juntament amb l\u2019estructura dels plecs i nivells de calc\u00e0ries que afecten les seq\u00fc\u00e8ncies carbonatades i restes f\u00f2ssils que han perm\u00e8s datar aquests materials.<\/p>\n

A la cinquena parada 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 erosiona i arrossega el terra argil\u00f3s. Les “badlands<\/em>” s\u00f3n grans extensions de terreny on t\u00e9 lloc aquest fenomen.<\/p>\n

\"\"<\/p>\n

En al seg\u00fcent parada, la font de Can Farr\u00e9s han dedu\u00eft la formaci\u00f3 d\u2019aq\u00fc\u00edfers captius i lliures amb els seus nivells piezom\u00e8trics associats. Finalment, la darrera parada ha estat a la masia de Can Farr\u00e9s, on han observat f\u00f2ssils de crino\u00efdeus i ortocer\u00e0tids en la roca calc\u00e0ria del cobert prop de la masia.<\/p>\n

El recorregut ha estat exigent per\u00f2 molt profit\u00f3s gr\u00e0cies a la motivaci\u00f3 d’un alumnat i un professorat molt animat. Heu fet una gran tasca, fins la propera!<\/p>\n","protected":false},"excerpt":{"rendered":"

Dimecres 22 de gener de 2025 l’alumnat de l’assignatura de Geologia i Ci\u00e8ncies Ambientals de 2n de batxillerat de l’Institut Montpedr\u00f3s de\u00a0 Santa Coloma de Cervell\u00f3 ha realitzat l’itinerari geol\u00f2gic de Santa Creu d\u2019Olorda. Aquest itinerari circular est\u00e0 constitu\u00eft per 7 parades en les que es poden observar diferents formacions i afloraments geol\u00f2gics destacables de […]<\/p>\n","protected":false},"author":3,"featured_media":22048,"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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