{"id":13688,"date":"2021-07-22T17:20:47","date_gmt":"2021-07-22T15:20:47","guid":{"rendered":"http:\/\/volcanx.cluster031.hosting.ovh.net\/?post_type=glossary&#038;p=13688"},"modified":"2021-07-26T17:25:51","modified_gmt":"2021-07-26T15:25:51","slug":"andesite-fr","status":"publish","type":"glossary","link":"https:\/\/volcanofoundation.org\/fr\/glossary\/andesite-fr\/","title":{"rendered":"AND\u00c9SITE"},"content":{"rendered":"<p>Les roches volcaniques (ou laves) sont de couleur fonc&eacute;e moyenne et contiennent 54 &agrave; 62 % de <a class=\"glossaryLink\"  aria-describedby=\"tt\"  data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;SILICE&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;Le dioxyde de silicium, le compos&eacute; rocaille le plus abondant sur Terre et le constituant mol&eacute;culaire pr&eacute;dominant des roches volcaniques et des magmas. Il a tendance &agrave; se polym&eacute;riser en cha&icirc;nes mol&eacute;culaires, augmentant la viscosit&eacute; du magma. Le magma basaltique, ayant un SiO2 plus faible, est assez fluide, mais avec une teneur croissante en SiO2, en and&eacute;site, en dacite et en rhyolite, les magmas deviennent progressivement plus visqueux. Parce qu&amp;#039;il est plus difficile pour les gaz dissous de s&amp;#039;&eacute;chapper de magma plus visqueux, les magmas de silice plus &eacute;lev&eacute;s &eacute;clatent g&eacute;n&eacute;ralement de mani&egrave;re plus explosive.&lt;\/div&gt;\"  href=\"https:\/\/volcanofoundation.org\/fr\/glossary\/silice-fr\/\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'  tabindex='0' role='link'>silice<\/a> et des quantit&eacute;s mod&eacute;r&eacute;es de fer et de magn&eacute;sium.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Les roches volcaniques (ou laves) sont de couleur fonc&eacute;e moyenne et contiennent 54 &agrave; 62 % de <a class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;SILICE&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;Le dioxyde de silicium, le compos&eacute; rocaille le plus abondant sur Terre et le constituant mol&eacute;culaire pr&eacute;dominant des roches volcaniques et des magmas. Il a tendance &agrave; se polym&eacute;riser en cha&icirc;nes mol&eacute;culaires, augmentant la viscosit&eacute; du magma. Le magma basaltique, ayant un SiO2 plus faible, est assez fluide, mais avec une teneur croissante en SiO2, en and&eacute;site, en dacite et en rhyolite, les magmas deviennent progressivement plus visqueux. Parce qu&amp;#039;il est plus difficile pour les gaz dissous de s&amp;#039;&eacute;chapper de magma plus visqueux, les magmas de silice plus &eacute;lev&eacute;s &eacute;clatent g&eacute;n&eacute;ralement de mani&egrave;re plus explosive.&lt;\/div&gt;\" href=\"https:\/\/volcanofoundation.org\/fr\/glossary\/silice-fr\/\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">silice<\/a> et des quantit&eacute;s mod&eacute;r&eacute;es de fer et de magn&eacute;sium.<\/p>\n","protected":false},"author":8,"featured_media":0,"menu_order":0,"template":"","meta":{"footnotes":""},"class_list":["post-13688","glossary","type-glossary","status-publish","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.0.1 - aioseo.com -->\n\t<meta name=\"robots\" content=\"max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n\t<meta name=\"author\" content=\"Anne Fornier\"\/>\n\t<link rel=\"canonical\" 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