{"id":13850,"date":"2021-07-22T19:16:59","date_gmt":"2021-07-22T17:16:59","guid":{"rendered":"http:\/\/volcanx.cluster031.hosting.ovh.net\/?post_type=glossary&#038;p=13850"},"modified":"2021-07-26T17:19:02","modified_gmt":"2021-07-26T15:19:02","slug":"silicique-fr","status":"publish","type":"glossary","link":"https:\/\/volcanofoundation.org\/fr\/glossary\/silicique-fr\/","title":{"rendered":"SILICIQUE"},"content":{"rendered":"<p>D&eacute;crit le <a class=\"glossary\" title=\"Molten rock beneath the surface of the Earth.\" href=\"https:\/\/volcanoes.usgs.gov\/vsc\/glossary\/magma.html\">magma <\/a>qui contient plus d&rsquo;environ 63 % de <a class=\"glossary\" title=\"Silicon dioxide, the most abundant rock-forming compound on Earth and the predominant molecular constituent of volcanic rocks and magmas. It tends to polymerize into molecular chains, increasing the viscosity of the magma. Basaltic magma, having lower SiO2, is fairly fluid, but with increasing contents of SiO2, andesite, dacite, and rhyolite magmas become progressively more viscous. Because it is more difficult for dissolved gas to escape from more viscous magma, higher silica magmas generally erupt more explosively.\" href=\"https:\/\/volcanoes.usgs.gov\/vsc\/glossary\/silica.html\">silice <\/a>et qui est g&eacute;n&eacute;ralement visqueux, riche en gaz et a tendance &agrave; &eacute;clater de <a class=\"glossary\" title=\"An energetic eruption that produces mainly ash, pumice, and fragmental ballistic debris (as opposed to an effusive eruption).\" href=\"https:\/\/volcanoes.usgs.gov\/vsc\/glossary\/explosive_eruption.html\">mani&egrave;re explosive<\/a>. Comprend <a class=\"glossary\" title=\"Volcanic rock (or lava) that characteristically is light in color, contains 69 or more percent of silica, and is rich in potassium and sodium. Low-silica rhyolite contains 69 to 74 percent silica. High-silica rhyolite contains 75 to 80 percent silica. Rhyolitic lavas are viscous and tend to form thick blocky lava flows or steep-sided piles of lava called lava domes. Rhyolite magmas tend to erupt explosively, commonly also producing abundant ash and pumice.\" href=\"https:\/\/volcanoes.usgs.gov\/vsc\/glossary\/rhyolite.html\">la rhyolite <\/a>et la <a class=\"glossary\" title=\"Volcanic rock (or lava) that characteristically is light in color and contains 62 to 69 percent silica and moderate amounts of sodium and potassium.\" href=\"https:\/\/volcanoes.usgs.gov\/vsc\/glossary\/dacite.html\">dacite<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>D&eacute;crit le <a class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;MAGMA&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;Roche fondue sous la surface de la Terre.&lt;\/div&gt;\" href=\"https:\/\/volcanofoundation.org\/fr\/glossary\/magma-fr\/\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">magma<\/a> qui contient plus d&rsquo;environ 63 % 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 qui est g&eacute;n&eacute;ralement visqueux, riche en gaz et a tendance &agrave; &eacute;clater de mani&egrave;re explosive. Comprend la <a class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;RHYOLITE&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;Roche volcanique (ou lave) qui est caract&eacute;ristique de couleur claire, contient 69 % ou plus de silice et est riche en potassium et en sodium. La faible silicarhyolite contient 69 &agrave; 74 % de silice. La rhyolite &agrave; haute teneur en silice contient de 75 &agrave; 80 % de silice. Les laves rhyolitiques sont visqueuses et ont tendance &agrave; former d&amp;#039;&eacute;paisses coul&eacute;es de lave par blocs ou des tas de lave &agrave; flancs abrupts appel&eacute;s d&ocirc;mes de lave. Les magmas de rhyolite ont tendance &agrave; &eacute;clater de mani&egrave;re explosive, produisant g&eacute;n&eacute;ralement &eacute;galement d&amp;#039;abondantes cendres et ponces.&amp;amp;nbsp;&lt;\/div&gt;\" href=\"https:\/\/volcanofoundation.org\/fr\/glossary\/rhyolite-fr\/\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">rhyolite<\/a> et la <a class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;DACITE&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;Roche volcanique (ou lave) qui a pour caract&eacute;ristique d&amp;#039;&ecirc;tre de couleur claire et de contenir 62 &agrave; 69 % de silice et des quantit&eacute;s mod&eacute;r&eacute;es de sodium et de potassium.&lt;\/div&gt;\" href=\"https:\/\/volcanofoundation.org\/fr\/glossary\/dacite-fr\/\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">dacite<\/a>.<\/p>\n","protected":false},"author":8,"featured_media":0,"menu_order":0,"template":"","meta":{"footnotes":""},"class_list":["post-13850","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\" href=\"https:\/\/volcanofoundation.org\/fr\/glossary\/silicique-fr\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 5.0.0.1\" \/>\n\t\t<meta property=\"og:locale\" content=\"fr_FR\" \/>\n\t\t<meta property=\"og:site_name\" content=\"VOLCANO ACTIVE FOUNDATION\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"SILICIQUE | VOLCANO ACTIVE FOUNDATION\" \/>\n\t\t<meta property=\"og:url\" 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