{"id":863,"date":"2025-02-11T12:44:52","date_gmt":"2025-02-11T11:44:52","guid":{"rendered":"https:\/\/sekoly.mydatadigital.com\/?page_id=863"},"modified":"2025-04-01T14:21:10","modified_gmt":"2025-04-01T12:21:10","slug":"itasy","status":"publish","type":"page","link":"https:\/\/sekoly.mydatadigital.com\/index.php\/itasy\/","title":{"rendered":"ITASY"},"content":{"rendered":"\t\t
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LAC ITASY ET LES VOLCANS \u00c9TEINTS<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Un H\u00e9ritage Volcanique au C\u0153ur de Madagascar<\/strong><\/h3>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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\n\t\t\t\t\t\t\n\t\t\t\t\t\t\tSuperficie\t\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/h3>\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t

\n\t\t\t\t\t\t699 300 ha\t\t\t\t\t<\/p>\n\t\t\t\t\n\t\t\t<\/div>\n\t\t\t\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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\n\t\t\t\t\t\tRegion ITASY; District Miarinarivo,Arivonimamo,Soavinandriana.
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\n\t\t\t\t\t\t\n\t\t\t\t\t\t\tCat\u00e9gorie\t\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/h3>\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t

\n\t\t\t\t\t\tZone d\u2019\u00e9cotourisme\t\t\t\t\t<\/p>\n\t\t\t\t\n\t\t\t<\/div>\n\t\t\t\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Histoire G\u00e9ologique<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Contexte Volcanique<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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\n\t\t\t\t\t\t Activit\u00e9 volcanique du Quaternaire (entre 1,5 million d\u2019ann\u00e9es et 10 000 ans avant notre \u00e8re).\t\t\t\t\t<\/p>\n\t\t\t\t\n\t\t\t<\/div>\n\t\t\t\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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\n\t\t\t\t\t\tLe lac Itasy s\u2019est form\u00e9 dans une d\u00e9pression tectonique li\u00e9e \u00e0 l\u2019effondrement partiel d\u2019une chambre magmatique vide, combin\u00e9 \u00e0 des mouvements de failles. Les volcans environnants (Andranoratra, Ambohibe, Angavo) font partie du champ volcanique de l\u2019Itasy <\/strong>, l\u2019un des rares complexes volcaniques actifs dans l\u2019histoire r\u00e9cente de Madagascar.\t\t\t\t\t<\/p>\n\t\t\t\t\n\t\t\t<\/div>\n\t\t\t\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Histoire G\u00e9ologique<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Formation du Lac<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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\n\t\t\t\t\t\tLac d\u2019origine tectono-volcanique, aliment\u00e9 par des sources et des pr\u00e9cipitations.\t\t\t\t\t<\/p>\n\t\t\t\t\n\t\t\t<\/div>\n\t\t\t\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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\n\t\t\t\t\t\tAutrefois plus \u00e9tendu, le lac a r\u00e9tr\u00e9ci en raison de la s\u00e9dimentation (apports des rivi\u00e8res) et des activit\u00e9s humaines (d\u00e9forestation, agriculture).\t\t\t\t\t<\/p>\n\t\t\t\t\n\t\t\t<\/div>\n\t\t\t\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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\n\t\t\t\t\t\t\n\t\t\t\t\t\t\tFormations G\u00e9ologiques Embl\u00e9matiques\t\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/h3>\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t

\n\t\t\t\t\t\tVolcans \u00c9teints :<\/strong>\n\n     

  • Andranoratra<\/strong> (1 801 m) : C\u00f4ne de scories basaltiques, offrant un panorama sur le lac et les collines.\n\n     
  • Ambohibe<\/strong> : D\u00f4me de lave trachytique, vestige d\u2019une activit\u00e9 explosive pass\u00e9e.\n\n     
  • Angavo <\/strong>: Coul\u00e9es de lave solidifi\u00e9es, visibles sous forme de plateaux rocheux.
    \n\nGeysers d\u2019Analavory <\/strong>: Ph\u00e9nom\u00e8ne rare de geysers d\u2019eau froide, provoqu\u00e9s par des \u00e9missions de gaz carbonique sous pression (li\u00e9es au syst\u00e8me volcanique \u00e9teint).
    \n\nCoul\u00e9es Basaltiques <\/strong>: Formations noires ou rouge\u00e2tres, t\u00e9moins d\u2019anciennes \u00e9ruptions effusives\t\t\t\t\t<\/p>\n\t\t\t\t\n\t\t\t<\/div>\n\t\t\t\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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    G\u00e9ologie<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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    Processus G\u00e9ologiques Actifs<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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    \n\t\t\t\t\t\t\n\t\t\t\t\t\t\tActivit\u00e9 G\u00e9othermique R\u00e9siduelle\t\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/h3>\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t

    \n\t\t\t\t\t\t Les geysers d\u2019Analavory et les sources chaudes locales rappellent que le syst\u00e8me magmatique n\u2019est pas totalement \u00e9teint.\t\t\t\t\t<\/p>\n\t\t\t\t\n\t\t\t<\/div>\n\t\t\t\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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    \n\t\t\t\t\t\t\n\t\t\t\t\t\t\tS\u00e9dimentation\t\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/h3>\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t

    \n\t\t\t\t\t\t Le lac perd progressivement sa profondeur (moins de 5 m aujourd\u2019hui) \u00e0 cause des apports de s\u00e9diments.\t\t\t\t\t<\/p>\n\t\t\t\t\n\t\t\t<\/div>\n\t\t\t\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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    \n\t\t\t\t\t\t\n\t\t\t\t\t\t\t\u00c9rosion Acc\u00e9l\u00e9r\u00e9e\t\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/h3>\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t

    \n\t\t\t\t\t\tLes pluies tropicales et les activit\u00e9s agricoles d\u00e9gradent les sols volcaniques fertiles, accentuant l\u2019envasement du lac.\t\t\t\t\t<\/p>\n\t\t\t\t\n\t\t\t<\/div>\n\t\t\t\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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    Galerie<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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    Explorez ITASY: l\u00e0 o\u00f9 la terre raconte ses col\u00e8res anciennes!<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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    Le lac ITASY et ses volcans \u00e9teints
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    \u00ab une fen\u00eatre sur le pass\u00e9 g\u00e9ologique tumultueux de Madagascar\u00bb<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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    Explorez davantage : D\u00e9couvrez<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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    Le TSINGY DE BEMARAHA<\/h3>

    D\u00e9couvrez un monde fascinant o\u00f9 la nature a sculpt\u00e9 des pics rocheux ac\u00e9r\u00e9s uniques au monde. Aventurez-vous dans ce paysage spectaculaire class\u00e9 au patrimoine mondial de l'UNESCO<\/p><\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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    \"\"<\/figure>

    Le Parc National d'ISALO<\/h3>

    D\u00e9couvrez un paysage unique o\u00f9 canyons, roches sculpt\u00e9es et oasis verdoyantes se m\u00ealent pour offrir une exp\u00e9rience fascinante au c\u0153ur de Madagascar.<\/span><\/p><\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

    \n\t\t\t\t
    \n\t\t\t\t\t\t\t\t\t
    \n\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t<\/path><\/svg>\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\tCliquez ici<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
    \n\t\t\t\t
    \n\t\t\t\t
    \n\t\t\t\t\t
    \"\"<\/figure>

    Le fossile du bassin de Morondava<\/h3>

    D\u00e9couvrez un monde fascinant o\u00f9 la nature a sculpt\u00e9 des pics rocheux ac\u00e9r\u00e9s uniques au monde. Aventurez-vous dans ce paysage spectaculaire class\u00e9 au patrimoine mondial de l'UNESCO <\/p><\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

    \n\t\t\t\t
    \n\t\t\t\t\t\t\t\t\t
    \n\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t<\/path><\/svg>\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\tCliquez ici<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

    LAC ITASY ET LES VOLCANS \u00c9TEINTS Un H\u00e9ritage Volcanique au C\u0153ur de Madagascar Superficie 699 300 ha Localisation Region ITASY; […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"site-sidebar-layout":"no-sidebar","site-content-layout":"","ast-site-content-layout":"full-width-container","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":"disabled","ast-breadcrumbs-content":"","ast-featured-img":"disabled","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":""},"class_list":["post-863","page","type-page","status-publish","hentry"],"yoast_head":"\nITASY - G\u00c9OLOGIE DE MADAGASCAR<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/sekoly.mydatadigital.com\/index.php\/itasy\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"ITASY - G\u00c9OLOGIE DE MADAGASCAR\" \/>\n<meta property=\"og:description\" content=\"LAC ITASY ET LES VOLCANS \u00c9TEINTS Un H\u00e9ritage Volcanique au C\u0153ur de Madagascar Superficie 699 300 ha Localisation Region ITASY; 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