{"id":22532,"date":"2025-03-11T15:28:02","date_gmt":"2025-03-11T14:28:02","guid":{"rendered":"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/?p=22532"},"modified":"2025-03-19T13:09:40","modified_gmt":"2025-03-19T12:09:40","slug":"mars-als-cims-i-rius-de-pedres","status":"publish","type":"post","link":"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/general\/mars-als-cims-i-rius-de-pedres\/","title":{"rendered":"Mars als cims i rius de pedres"},"content":{"rendered":"

Avui, dimarts 11 de mar\u00e7 de 2025, l\u2019alumnat de ci\u00e8ncies de 4t d’ESO i de 2n de Batxillerat de l\u2019Institut Premi\u00e0 de Mar <\/a>ha vingut a Pallej\u00e0 per estudiar tres afloraments diferents de roques sediment\u00e0ries del Tri\u00e0sic.<\/a> L’objectiu de la sortida \u00e9s reconstruir tant la hist\u00f2ria geol\u00f2gica d\u2019aquests dip\u00f2sits com els seus ambients sedimentaris.<\/p>\n

\"\"<\/p>\n

L\u2019activitat est\u00e0 plantejada com un itinerari circular amb 3 parades diferenciades. En cadascuna d\u2019elles han pres nota de les coordenades UTM, de l\u2019altitud i, a partir una s\u00e8rie de proves anal\u00edtiques, han aconseguit identificar les diferents roques que han anat trobant, ajudant-se d\u2019una clau dicot\u00f2mica. Han mesurat la pot\u00e8ncia, la granulometria, les estructures sediment\u00e0ries observables en els materials i la seva duresa. Fins i tot han atacat cada mostra amb \u00e0cid clorh\u00eddric (HCl) dilu\u00eft al 10% per detectar-hi la pres\u00e8ncia de carbonat de calci.<\/p>\n

Amb totes aquestes dades han concl\u00f2s que el primer aflorament corresponia a un conglomerat i el segon a un gres. Han observat que el conglomerat contenia clastos arrodonits, indicant un transport fluvial llarg abans de la seva sedimentaci\u00f3, mentre que el gres presentava una granulometria m\u00e9s fina, suggerint una acumulaci\u00f3 en zones de menor energia. Aquestes dues roques rogenques d\u2019origen continental corresponen a ambients sedimentaris al\u00b7luvials del Tri\u00e0sic inferior.<\/span><\/p>\n

\"\" <\/span><\/p>\n

A l\u2019aflorament superior, en canvi, han identificat roques calc\u00e0ries amb alguns f\u00f2ssils marins que indicaven unes\u00a0condicions de sedimentaci\u00f3 marines. D\u2019aquesta manera han pogut <\/span>determinar que en el passat aquella zona estava coberta per un mar poc profund i, per tant, confirmar la transgressi\u00f3 marina que hi va tenir lloc en aquella \u00e8poca.\u00a0<\/span><\/p>\n

Amb tot plegat, han hagut de reconstruir la hist\u00f2ria geol\u00f2gica a partir del principi de superposici\u00f3 dels estrats tot entenent un proc\u00e9s prou complex com \u00e9s l’erosi\u00f3 remuntant, en la qual un riu erosiona el seu llit en sentit contrari al flux de l\u2019aigua, allargant-se cap a la seva cap\u00e7alera al llarg de milions d’anys.<\/span>\u00a0Aquesta an\u00e0lisi ha refor\u00e7at la import\u00e0ncia de la geologia com a eina per interpretar els paisatges i la seva evoluci\u00f3 al llarg del temps.<\/p>\n

Han completat una gran feina de camp i han gaudit d\u2019una manera diferent de la geologia. Us esperem ben aviat!<\/p>\n","protected":false},"excerpt":{"rendered":"

Avui, dimarts 11 de mar\u00e7 de 2025, l\u2019alumnat de ci\u00e8ncies de 4t d’ESO i de 2n de Batxillerat de l\u2019Institut Premi\u00e0 de Mar ha vingut a Pallej\u00e0 per estudiar tres afloraments diferents de roques sediment\u00e0ries del Tri\u00e0sic. L’objectiu de la sortida \u00e9s reconstruir tant la hist\u00f2ria geol\u00f2gica d\u2019aquests dip\u00f2sits com els seus ambients sedimentaris. L\u2019activitat […]<\/p>\n","protected":false},"author":3,"featured_media":22537,"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 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":[395,393,399,397,1,29,348],"tags":[],"class_list":["post-22532","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-aprendreambelscampsientorns","category-campsientornsdaprenentatge","category-projectecda","category-sortidacda","category-general","category-portada","category-sedimentaries"],"post_mailing_queue_ids":[],"_links":{"self":[{"href":"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-json\/wp\/v2\/posts\/22532","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-json\/wp\/v2\/comments?post=22532"}],"version-history":[{"count":6,"href":"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-json\/wp\/v2\/posts\/22532\/revisions"}],"predecessor-version":[{"id":22551,"href":"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-json\/wp\/v2\/posts\/22532\/revisions\/22551"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-json\/wp\/v2\/media\/22537"}],"wp:attachment":[{"href":"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-json\/wp\/v2\/media?parent=22532"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-json\/wp\/v2\/categories?post=22532"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-json\/wp\/v2\/tags?post=22532"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}