{"id":3867,"date":"2017-03-12T18:43:31","date_gmt":"2017-03-12T17:43:31","guid":{"rendered":"http:\/\/gite.fudral.com\/?p=3867"},"modified":"2018-07-17T09:51:39","modified_gmt":"2018-07-17T08:51:39","slug":"caillou-de-montvalezan","status":"publish","type":"post","link":"https:\/\/gite.fudral.com\/en\/le-saviez-vous\/un-peu-de-science\/caillou-de-montvalezan\/","title":{"rendered":"Un caillou de Montvalezan ?"},"content":{"rendered":"<p>&#8221; width=&#8221;225&#8243; height=&#8221;300&#8243; \/><\/a> [\/caption]Lorsque les graviers ne d\u00e9passent pas 2 mm, la roche s\u2019appelle <strong>un gr\u00e8s<\/strong>. Et point de petits plis ici mais on voit un d\u00e9bit tr\u00e8s fin qui n\u2019est pas forc\u00e9ment parall\u00e8le \u00e0 l\u2019alignement des grains. <strong>Ce d\u00e9bit est appel\u00e9 la schistosit\u00e9. <\/strong>Comme les plis, la schistosit\u00e9 est li\u00e9e \u00e0 la d\u00e9formation de la roche.<\/p>\n<figure id=\"attachment_3870\" aria-describedby=\"caption-attachment-3870\" style=\"width: 300px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/gite.fudral.com\/wp-content\/uploads\/2017\/03\/IMG_4668.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-3870\" src=\"http:\/\/gite.fudral.com\/wp-content\/uploads\/2017\/03\/IMG_4668-300x235.jpg\" alt=\"Partie du mur des Ecombelles fait de blocs de gr\u00e8s. \" width=\"300\" height=\"235\" srcset=\"https:\/\/gite.fudral.com\/wp-content\/uploads\/2017\/03\/IMG_4668-300x235.jpg 300w, https:\/\/gite.fudral.com\/wp-content\/uploads\/2017\/03\/IMG_4668-1024x801.jpg 1024w, https:\/\/gite.fudral.com\/wp-content\/uploads\/2017\/03\/IMG_4668.jpg 1342w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><figcaption id=\"caption-attachment-3870\" class=\"wp-caption-text\">Partie du mur des Ecombelles fait de blocs de gr\u00e8s.<\/figcaption><\/figure>\n<p>Et si le grain de la roche est vraiment tr\u00e8s fin, de l\u2019ordre du micron (1\/1000\u00e8 de mm), donc invisible \u00e0 l\u2019\u0153il nu, la roche s\u2019appelle<strong> un schiste. Le grain est fait de min\u00e9raux en feuillets d\u00e9riv\u00e9s des argiles. <\/strong>Ici c\u2019est la schistosit\u00e9 qui caract\u00e9rise la roche. <strong>Les ardoises et les lauzes<\/strong> des toits des maisons ne sont \u00e0 Montvalezan que des schistes de grande extension. Les ardoises ont un d\u00e9bit bien parall\u00e8le et peuvent s\u2019utiliser en \u00e9tant peu \u00e9paisses\u00a0; les lauzes en revanche sont moins r\u00e9guli\u00e8res de sorte qu\u2019un \u00e9chantillon de lauze doit \u00eatre \u00e9pais pour n\u2019\u00eatre pas cassant.<\/p>\n<figure id=\"attachment_3869\" aria-describedby=\"caption-attachment-3869\" style=\"width: 300px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/gite.fudral.com\/wp-content\/uploads\/2017\/03\/IMG_0869.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-3869\" src=\"http:\/\/gite.fudral.com\/wp-content\/uploads\/2017\/03\/IMG_0869-300x225.jpg\" alt=\"Ancien toit du g\u00eete des Ecombelles couvert de lauzes ou ardoises \u00e9paisses.\" width=\"300\" height=\"225\" srcset=\"https:\/\/gite.fudral.com\/wp-content\/uploads\/2017\/03\/IMG_0869-300x225.jpg 300w, https:\/\/gite.fudral.com\/wp-content\/uploads\/2017\/03\/IMG_0869-1024x768.jpg 1024w, https:\/\/gite.fudral.com\/wp-content\/uploads\/2017\/03\/IMG_0869-200x150.jpg 200w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><figcaption id=\"caption-attachment-3869\" class=\"wp-caption-text\">Ancien toit du g\u00eete des Ecombelles couvert de lauzes ou ardoises \u00e9paisses.<\/figcaption><\/figure>\n<p>En d\u00e9finitive, ces trois cailloux repr\u00e9sentatifs des roches du substrat de Montvalezan, et expos\u00e9s sur le pr\u00e9sentoir du g\u00eete, appartiennent \u00e0 la m\u00eame famille, <strong>les roches s\u00e9dimentaires d\u00e9tritiques<\/strong>, c\u2019est-\u00e0-dire form\u00e9es \u00e0 la surface de la terre, g\u00e9n\u00e9ralement dans un milieu aquatique, rivi\u00e8re, lac ou mer et r\u00e9sultant de l\u2019\u00e9rosion des reliefs qui pr\u00e9existaient. Les plis et la schistosit\u00e9 sont intervenus bien apr\u00e8s, pendant l\u2019\u00e9dification de la chaine des Alpes. On retrouve cela sur la carte g\u00e9ologique du secteur (feuille Sainte-Foy-tarentaise). [http:\/\/editions.brgm.fr].<\/p>\n<p>A Montvalezan, passer un peu de temps \u00e0 examiner les cailloux extraits des champs \u00a0[<a href=\"http:\/\/gite.fudral.com\/le-saviez-vous\/un-peu-de-science\/cailloux-de-nos-jardins\/\">http:\/\/gite.fudral.com\/le-saviez-vous\/un-peu-de-science\/cailloux-de-nos-jardins\/<\/a>]\u00a0ou d\u00e9pos\u00e9s dans les murgers [<a href=\"http:\/\/gite.fudral.com\/le-saviez-vous\/un-peu-de-science\/les-murgers\/\">http:\/\/gite.fudral.com\/le-saviez-vous\/un-peu-de-science\/les-murgers\/<\/a>]permet de retrouver ces trois types de roches. Et le chalet des Ecombelles les montre aussi\u00a0: l\u2019escalier d\u2019acc\u00e8s s\u2019appuie sur un conglom\u00e9rat \u00e0 gros galets\u00a0; les murs ont \u00e9t\u00e9 \u00e9difi\u00e9s essentiellement avec des gr\u00e8s et l\u2019ancien toit \u00e9tait couvert de lauzes. On d\u00e9montre, s\u2019il le fallait, que les montvalezanais ont fait un ing\u00e9nieux usage de ces mat\u00e9riaux \u00a0pour construire leurs maisons.&#8221; width=&#8221;300&#8243; height=&#8221;235&#8243; \/><\/a> [\/caption]Et si le grain de la roche est vraiment tr\u00e8s fin, de l\u2019ordre du micron (1\/1000\u00e8 de mm), donc invisible \u00e0 l\u2019\u0153il nu, la roche s\u2019appelle<strong> un schiste. Le grain est fait de min\u00e9raux en feuillets d\u00e9riv\u00e9s des argiles. <\/strong>Ici c\u2019est la schistosit\u00e9 qui caract\u00e9rise la roche. <strong>Les ardoises et les lauzes<\/strong> des toits des maisons ne sont \u00e0 Montvalezan que des schistes de grande extension. Les ardoises ont un d\u00e9bit bien parall\u00e8le et peuvent s\u2019utiliser en \u00e9tant peu \u00e9paisses\u00a0; les lauzes en revanche sont moins r\u00e9guli\u00e8res de sorte qu\u2019un \u00e9chantillon de lauze doit \u00eatre \u00e9pais pour n\u2019\u00eatre pas cassant.<\/p>\n<p><a href=\"http:\/\/gite.fudral.com\/wp-content\/uploads\/2017\/03\/IMG_0869.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-3869\" src=\"http:\/\/gite.fudral.com\/wp-content\/uploads\/2017\/03\/IMG_0869-300x225.jpg\" alt=\"\" width=\"300\" height=\"225\" srcset=\"https:\/\/gite.fudral.com\/wp-content\/uploads\/2017\/03\/IMG_0869-300x225.jpg 300w, https:\/\/gite.fudral.com\/wp-content\/uploads\/2017\/03\/IMG_0869-1024x768.jpg 1024w, https:\/\/gite.fudral.com\/wp-content\/uploads\/2017\/03\/IMG_0869-200x150.jpg 200w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a>En d\u00e9finitive, ces trois cailloux repr\u00e9sentatifs des roches du substrat de Montvalezan, et expos\u00e9s sur le pr\u00e9sentoir du g\u00eete, appartiennent \u00e0 la m\u00eame famille, <strong>les roches s\u00e9dimentaires d\u00e9tritiques<\/strong>, c\u2019est-\u00e0-dire form\u00e9es \u00e0 la surface de la terre, g\u00e9n\u00e9ralement dans un milieu aquatique, rivi\u00e8re, lac ou mer et r\u00e9sultant de l\u2019\u00e9rosion des reliefs qui pr\u00e9existaient. Les plis et la schistosit\u00e9 sont intervenus bien apr\u00e8s, pendant l\u2019\u00e9dification de la chaine des Alpes. On retrouve cela sur la carte g\u00e9ologique du secteur (feuille Sainte-Foy-tarentaise). [http:\/\/editions.brgm.fr].<\/p>\n<p>A Montvalezan, passer un peu de temps \u00e0 examiner les cailloux extraits des champs [lien interne] ou d\u00e9pos\u00e9s dans les murgers [lien interne] permet de retrouver ces trois types de roches. Et le chalet des Ecombelles les montre aussi\u00a0: l\u2019escalier d\u2019acc\u00e8s s\u2019appuie sur un conglom\u00e9rat \u00e0 gros galets\u00a0; les murs ont \u00e9t\u00e9 \u00e9difi\u00e9s essentiellement avec des gr\u00e8s et l\u2019ancien toit \u00e9tait couvert de lauzes. On d\u00e9montre, s\u2019il le fallait, que les montvalezanais ont fait un ing\u00e9nieux usage de ces mat\u00e9riaux \u00a0pour construire leurs maisons.<\/p>","protected":false},"excerpt":{"rendered":"<p>&#8221; width=&#8221;225&#8243; height=&#8221;300&#8243; \/> [\/caption]Lorsque les graviers ne d\u00e9passent pas 2 mm, la roche s\u2019appelle un gr\u00e8s. Et point de [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3871,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"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-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":"","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-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":"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":""},"mobile":{"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":""}},"footnotes":""},"categories":[89],"tags":[95,109],"class_list":["post-3867","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-un-peu-de-science","tag-traditions","tag-geologie"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Un caillou de Montvalezan ? 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