{"id":21265,"date":"2024-10-30T13:46:32","date_gmt":"2024-10-30T12:46:32","guid":{"rendered":"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/?p=21265"},"modified":"2025-01-28T16:39:19","modified_gmt":"2025-01-28T15:39:19","slug":"parada-1-la-pedrera-dels-ocells","status":"publish","type":"post","link":"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/general\/parada-1-la-pedrera-dels-ocells\/","title":{"rendered":"La pedrera dels ocells"},"content":{"rendered":"<p style=\"text-align: justify;\">El Patronat Metropolit\u00e0 del <a href=\"https:\/\/parcnaturalcollserola.cat\/\">Parc Natural de Collserola<\/a> ha treballat des del primer dia per recuperar aquesta antiga pedrera. Avui, gr\u00e0cies a l&#8217;empresa Valenciana de Cementos Portland, podem gaudir d&#8217;un nou espai per aprendre i con\u00e8ixer els ocells.<\/p>\n<p style=\"text-align: justify;\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-21268 alignright\" src=\"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-content\/uploads\/usu1385\/2024\/10\/Pedrera_dels_Ocells-2-300x223.jpg\" alt=\"\" width=\"325\" height=\"242\" srcset=\"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-content\/uploads\/usu1385\/2024\/10\/Pedrera_dels_Ocells-2-300x223.jpg 300w, https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-content\/uploads\/usu1385\/2024\/10\/Pedrera_dels_Ocells-2-768x570.jpg 768w, https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-content\/uploads\/usu1385\/2024\/10\/Pedrera_dels_Ocells-2-200x150.jpg 200w, https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-content\/uploads\/usu1385\/2024\/10\/Pedrera_dels_Ocells-2.jpg 800w\" sizes=\"auto, (max-width: 325px) 100vw, 325px\" \/>La Corporaci\u00f3 Metropolitana de Barcelona quan va remodelar l&#8217;esplanada de Santa Creu d&#8217;Olorda (1985-1987) amb l&#8217;adequaci\u00f3 de l&#8217;actual \u00e0rea de lleure, va transformar l&#8217;antiga pedrera en un auditori. Malauradament, la inestabilitat del terreny, deguda a la inclinaci\u00f3 dels nivells de les pissarres i a la pr\u00f2pia fragilitat dels materials, va causar alguns despreniments que van posar punt i final a l&#8217;\u00fas p\u00fablic de l&#8217;amfiteatre.<\/p>\n<p style=\"text-align: justify;\">El projecte actual combina dos objectius, el primer: reconvertir l&#8217;antiga pedrera en una zona humida en la qual hi puguin niar diferents esp\u00e8cies d&#8217;ocells i amfibis i, el segon: retornar-la a l&#8217;\u00fas p\u00fablic mitjan\u00e7ant la potenciaci\u00f3 de l&#8217;observaci\u00f3, des del mirador, de les activitats dels ocells i de les caracter\u00edstiques geol\u00f2giques de la pedrera. El projecte ha estat concebut amb els requeriments d&#8217;estabilitat i seguretat que ha d&#8217;oferir un equipament obert al p\u00fablic. S&#8217;ha despla\u00e7at la carretera per ubicar-hi el mirador, s&#8217;han farcit les balmes existents a les parets per evitar possibles despreniments i s&#8217;ha configurat l&#8217;interior, amb un sistema de basses que fan possible l&#8217;exist\u00e8ncia de vegetaci\u00f3 humida al seu voltant, potenciant aix\u00ed l&#8217;habitabilitat de la zona per a la petita fauna.<\/p>\n<p style=\"text-align: justify;\"><strong><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-21284 alignleft\" src=\"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-content\/uploads\/usu1385\/2024\/10\/3-10-300x215.jpg\" alt=\"\" width=\"325\" height=\"233\" srcset=\"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-content\/uploads\/usu1385\/2024\/10\/3-10-300x215.jpg 300w, https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-content\/uploads\/usu1385\/2024\/10\/3-10.jpg 397w\" sizes=\"auto, (max-width: 325px) 100vw, 325px\" \/>Unes pissarres caracter\u00edstiques<\/strong><\/p>\n<p style=\"text-align: justify;\">El color negre de les pissarres revela la gran quantitat de carb\u00f3 que contenen. Popularment anomenades pissarres bituminoses, antigament s&#8217;havien explotat per treure&#8217;n betum, que es feia servir per cremar en els forns de cal\u00e7, i per la seva riquesa en sulfats com a adob en el cultiu de les vinyes. En la hist\u00f2ria m\u00e9s recent, per\u00f2, es feien servir per acolorir el ciment. Fins als anys cinquanta, les pissarres s&#8217;explotaven per mitj\u00e0 de galeries excavades sota terra. Les dimensions dels t\u00fanels eren considerables, doncs els camions hi entraven per carregar. Durant la Guerra Civil havien servit de polvor\u00ed. <span style=\"font-family: inherit; font-size: 1em;\">Des de mitjans dels anys cinquanta fins al 1965, en que es va tancar, la mina es va explotar a cel obert, rebaixant la muntanya des del cim fins a arribar a fer el forat actual. L&#8217;aigua sempre hi ha estat present. Primer inundant les galeries i m\u00e9s tard xopant les terrasses, fins al punt que existeix una mina d&#8217;aigua que, des del Puig d&#8217;Olorda, abasteix la masia de Can Portell, aq<\/span><span style=\"font-family: inherit; font-size: 1em;\">u\u00ed a la vora.<\/span><\/p>\n<p style=\"text-align: justify;\">Les llicorelles o pissarres s\u00f3n les roques m\u00e9s abundants a la serra de Collserola i n&#8217;hi ha de diferents tipus. Les pissarres negres d&#8217;aquesta pedrera s\u00f3n, de fet, les m\u00e9s curioses de totes. Es van formar durant el Paleozoic, en el per\u00edode Siluri\u00e0, aix\u00f2 vol dir que les pissarres tenen una edat aproximada de 400 milions d&#8217;anys. Pels f\u00f2ssils que hi trobem, molt escassos, sabem que les pissarres es van formar en un ambient de mar obert.<span style=\"font-family: inherit; font-size: 1em; text-align: justify;\"> Eren sediments de sorres i llims molt fins que provenien d&#8217;alguna costa llunyana, que es dipositaven pl\u00e0cidament al fons mar\u00ed i posteriorment patien un proc\u00e9s de metamorfisme regional. Els \u00fanics rastres visibles que guarden, dels seus habitants, s\u00f3n d&#8217;ortocer\u00e0tids (mol\u00b7luscs de closca externa, semblants als calamars actuals), grapt\u00f2lits (animals colonials que vivien flotant a mar obert) i crino\u00efdeus (equinoderms bent\u00f2nics similars als actuals lliris de mar).<\/span><\/p>\n<p style=\"text-align: justify;\"><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-21280 alignleft\" src=\"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-content\/uploads\/usu1385\/2024\/10\/Sense-titol-300x212.jpg\" alt=\"\" width=\"329\" height=\"232\" srcset=\"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-content\/uploads\/usu1385\/2024\/10\/Sense-titol-300x212.jpg 300w, https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-content\/uploads\/usu1385\/2024\/10\/Sense-titol.jpg 519w\" sizes=\"auto, (max-width: 329px) 100vw, 329px\" \/>Dels successos que sofreixen les roques al llarg de la seva hist\u00f2ria, en resulten diferents minerals. Entre les pissarres de la pedrera es poden trobar minerals de: sofre, fosforita, grafit, magnetita,\u00a0al\u00b7l\u00f2fana i baritina. Actualment, l&#8217;aigua que es filtra entre les llicorelles, es tenyeix de colors diferents. Aix\u00f2 \u00e9s degut a l&#8217;exist\u00e8ncia de sulfurs i \u00f2xids dels diferents minerals que les composen, insolubles amb l&#8217;aigua. El color de l&#8217;aigua les basses que podem observar (ocre, vermell\u00f3s, etc.) ens informa del seu recorregut i de les terres que ha travessat pr\u00e8viament.<\/p>\n<p>Esperem que us hagi agradat aquest\u00a0 punt de l&#8217;<a href=\"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/ambits\/geologia\/itinerari-geologic-al-voltant-de-santa-creu-dolorda\/\">Itinerari Geol\u00f2gic de Santa Creu d&#8217;Olorda<\/a>, \u00e0nims que encara teniu feina per fer!<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>El Patronat Metropolit\u00e0 del Parc Natural de Collserola ha treballat des del primer dia per recuperar aquesta antiga pedrera. Avui, gr\u00e0cies a l&#8217;empresa Valenciana de Cementos Portland, podem gaudir d&#8217;un nou espai per aprendre i con\u00e8ixer els ocells. La Corporaci\u00f3 Metropolitana de Barcelona quan va remodelar l&#8217;esplanada de Santa Creu d&#8217;Olorda (1985-1987) amb l&#8217;adequaci\u00f3 de [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":21320,"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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