{"id":3115,"date":"2017-04-27T13:32:53","date_gmt":"2017-04-27T11:32:53","guid":{"rendered":"http:\/\/agora.xtec.cat\/iesm-jmzafra\/?p=3115"},"modified":"2017-04-27T13:32:53","modified_gmt":"2017-04-27T11:32:53","slug":"pissarra","status":"publish","type":"post","link":"https:\/\/agora.xtec.cat\/inscaterinaalbert\/general\/pissarra\/","title":{"rendered":"PISSARRA"},"content":{"rendered":"\n\n\n
\"pisarra_bona_2c4-jpg_v2\"<\/td>\nca<\/em>: pissarra<\/span><\/p>\n

es:<\/em> pizarra<\/p>\n

en<\/em>: slate<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n

\u00a0TIPUS DE ROCA<\/b><\/p>\n

Es una roca metam\u00f2rfica<\/span><\/p>\n

\u00a0DESCRIPCI\u00d3<\/strong><\/p>\n

La pissarra , prov\u00e9 de la transformaci\u00f3 d\u2019una altre roca de composici\u00f3 similar al canviar \u00a0les condicions ambientals del lloc on es troba. En aquest cas , la roca original anomenada prot\u00f2lit, era una roca detr\u00edtica de gra fi. Al augmentar la pressi\u00f3 i\/o la temperatura,la roca original pateix una s\u00e8rie de canvis que donen lloc a una nova roca, la pissarra. Els minerals d\u2019argila es transformen en miques, minerals planars, que s\u2019orienten en l\u00e0mines donant l\u2019aspecte foliat t\u00edpic de les pissarres.<\/p>\n

\u00a0COMPOSICI\u00d3 QU\u00cdMICA<\/strong><\/p>\n

Generalment s\u00f3n roques de color fosc i llu\u00efssor mate, degut a que la mida de gra \u00e9s molt petita, encara que poden presentar altres tonalitats depenent dels minerals que la formen i la seva abund\u00e0ncia. S\u00f3n roques dures, denses i impermeables. Es trenquen en l\u00e0mines planes degut a la seva estructura foliada.<\/p>\n

\u00a0CARACTER\u00cdSTIQUES F\u00cdSIQUES I QU\u00cdMIQUES<\/strong><\/p>\n

La principal caracter\u00edstica de la pissarra \u00e9s la seva divisi\u00f3 en fines l\u00e0mines o capes,coneguda com foliaci\u00f3 o esquistositat. Els minerals que la formen s\u00f3n principalment quars i moscovita.Sol ser de color negre blav\u00f3s o negre grisenc, per\u00f2 existeixen varietats vermelles, verdes i altres tons.<\/span><\/p>\n

\u00a0\u00c8POCA DE LA PISSARRA<\/strong><\/p>\n

Va apar\u00e8ixer fa 360 MA en el Carbon\u00edfer.<\/span><\/p>\n

OBSERVACI\u00d3 AMB LUPA<\/strong><\/p>\n

\"20170113_114924\"<\/a><\/p>\n

 <\/p>\n

\u00daS DE LA PISSARRA EN LA ACTUALITAT<\/strong><\/p>\n

La pissarra s\u2019utilitzaba des de el principi del temps.Sobretot s\u2019ha utilitzat en llocs on esta a menys profunditat i sobretot s\u2019ha utilitzat per la seva impermeabilitzaci\u00f3 de edificacions, amb fins estructurals.Evidentment la pissarra empleada en construccions antigues es tosca i poc elaborada a causa de la mala elaboraci\u00f3 a causa de las t\u00e8cniques emprades en la seva extracci\u00f3 i treball.Per\u00f2 recorre al principi de visibilitat caracter\u00edstic de la pissarra Hist\u00f2ricament s\u2019han donat altres usos a la pissarra, per exemple en la decoraci\u00f3 i art funerari.<\/span><\/p>\n

En l\u2019actualitat la aplicaci\u00f3 mes com\u00fa de la pissarra es en la construcci\u00f3 de cobertes.<\/span><\/p>\n

LLOC D’ORIGEN<\/b><\/p>\n

L\u2019origent d\u2019aquesta pedra son el Pirineus catalans que s\u00f3n un conjunt de serres,situades al nord de la pen\u00ednsula Ib\u00e8rica.Ocupen la zona nord de Catalunya,l\u2019Arag\u00f3, Navarra i Euskadi.<\/span><\/p>\n

Podr\u00edem identificar com la primera mostra de la necessitat de l’home prehist\u00f2ric de transmetre els seus coneixements, com les pintures sobre les parets d’una cova. Ja amb les primeres civilitzacions de l’Orient Mitj\u00e0 es t\u00e9 l’escriptura sobre tauletes d’argila. De fet, un dels trets fonamentals que ens permeten considerar a un grup hum\u00e0 com una civilitzaci\u00f3, \u00e9s la capacitat de transmetre coneixements per mitj\u00e0 de l’escriptura per mitj\u00e0 d’un codi determinat.\"descarga\"<\/a><\/span><\/p>\n

MAPA<\/strong><\/p>\n

\u00a0http:\/\/www.stepmap.com\/<\/b><\/a><\/p>\n

 <\/p>\n

PROCEDENCIA\u00a0<\/b><\/p>\n

La pissarra procedeix de l\u2019Escola Superior d\u2019Agricultura, la pe\u00e7a va ser trobada al<\/span> t\u00fanel de Vielha que \u00e9s un t\u00fanel carreter situat al Pirineu central que comunica les comarques d’Alta Ribagor\u00e7a i Vall d’Aran.<\/span><\/p>\n

 <\/p>\n

REFER\u00c8NCIES BIBLIOGR\u00c0FIQUES<\/b><\/p>\n

Hist\u00f2ria natural dels pa\u00efsos Catalans<\/b><\/p>\n

L\u2019autor \u00e9s Ramos Folch i Guill\u00e8n<\/span><\/p>\n

El llibre es diu Hist\u00f2ria natural del pa\u00efsos Catalans.<\/span><\/p>\n

L\u2019editorial \u00e9s Fundaci\u00f3 Enciclop\u00e8dica Catalana.<\/span><\/p>\n

El pa\u00eds d\u2019edici\u00f3 \u00e9s Espanya.<\/span><\/p>\n

L\u2019any d\u2019edici\u00f3 \u00e9s 1992.<\/span><\/p>\n

 <\/p>\n

Roques i minerals<\/b><\/p>\n

L\u2019autor \u00e9s Steve Parker <\/span><\/p>\n

El llibre es diu observant la natura: roques i minerals, investigant el m\u00f3n fascinant de les roques i minerals.<\/span><\/p>\n

L\u2019editorial \u00e9s Cruilla Saber<\/span><\/p>\n

El pa\u00eds d\u2019edici\u00f3 \u00e9s It\u00e0lia<\/span><\/p>\n

L\u2019any \u00e9s 1994<\/span><\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

ca: pissarra es: pizarra en: slate   \u00a0TIPUS DE ROCA Es una roca metam\u00f2rfica \u00a0DESCRIPCI\u00d3 La pissarra , prov\u00e9 de la transformaci\u00f3 d\u2019una altre roca de composici\u00f3 similar al canviar \u00a0les condicions ambientals del lloc on es troba. En aquest cas , la roca original anomenada prot\u00f2lit, era una roca detr\u00edtica de gra fi. Al […]<\/p>\n","protected":false},"author":124,"featured_media":0,"comment_status":"closed","ping_status":"open","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":[1,321],"tags":[335,355],"class_list":["post-3115","post","type-post","status-publish","format-standard","hentry","category-general","category-museu-de-geologia","tag-2c4","tag-metamorfica"],"post_mailing_queue_ids":[],"_links":{"self":[{"href":"https:\/\/agora.xtec.cat\/inscaterinaalbert\/wp-json\/wp\/v2\/posts\/3115","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/agora.xtec.cat\/inscaterinaalbert\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/agora.xtec.cat\/inscaterinaalbert\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/agora.xtec.cat\/inscaterinaalbert\/wp-json\/wp\/v2\/users\/124"}],"replies":[{"embeddable":true,"href":"https:\/\/agora.xtec.cat\/inscaterinaalbert\/wp-json\/wp\/v2\/comments?post=3115"}],"version-history":[{"count":3,"href":"https:\/\/agora.xtec.cat\/inscaterinaalbert\/wp-json\/wp\/v2\/posts\/3115\/revisions"}],"predecessor-version":[{"id":4243,"href":"https:\/\/agora.xtec.cat\/inscaterinaalbert\/wp-json\/wp\/v2\/posts\/3115\/revisions\/4243"}],"wp:attachment":[{"href":"https:\/\/agora.xtec.cat\/inscaterinaalbert\/wp-json\/wp\/v2\/media?parent=3115"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/agora.xtec.cat\/inscaterinaalbert\/wp-json\/wp\/v2\/categories?post=3115"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/agora.xtec.cat\/inscaterinaalbert\/wp-json\/wp\/v2\/tags?post=3115"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}