{"id":202110,"date":"2025-03-17T07:48:19","date_gmt":"2025-03-17T07:48:19","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=202110"},"modified":"2025-03-17T07:48:21","modified_gmt":"2025-03-17T07:48:21","slug":"describe-the-source-of-the-plutons-of-magma-that-rise-into-mountain-ranges-and-feed-volcanoes-overlying-subduction-zones","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/03\/17\/describe-the-source-of-the-plutons-of-magma-that-rise-into-mountain-ranges-and-feed-volcanoes-overlying-subduction-zones\/","title":{"rendered":"Describe the source of the plutons of magma that rise into mountain ranges and feed volcanoes overlying subduction zones"},"content":{"rendered":"\n<p>Describe the source of the plutons of magma that rise into mountain ranges and feed volcanoes overlying subduction zones<\/p>\n\n\n\n<p><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-6-color\"><strong>The correct answer and explanation is :<\/strong><\/mark><\/p>\n\n\n\n<p>The source of the plutons of magma that rise into mountain ranges and feed volcanoes overlying subduction zones is the melting of the mantle wedge above a subducting tectonic plate. This occurs due to the process of <strong>flux melting<\/strong>, which is triggered by the release of water and other volatiles from the subducting oceanic crust.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Explanation (300 words)<\/strong><\/h3>\n\n\n\n<p>Subduction zones are tectonic boundaries where one lithospheric plate is forced beneath another into the mantle. Typically, an oceanic plate subducts beneath a continental or another oceanic plate due to differences in density. As the descending plate sinks into the asthenosphere, it experiences <strong>increasing pressure and temperature<\/strong>, leading to dehydration reactions in minerals such as amphibole and serpentine. This process releases water and other volatiles into the overlying mantle wedge.<\/p>\n\n\n\n<p>Water significantly <strong>lowers the melting point<\/strong> of the mantle rock (mainly peridotite), causing <strong>partial melting<\/strong> to occur. This generates basaltic magma, which is less dense than the surrounding mantle and begins to rise toward the surface. The magma may either:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Accumulate in magma chambers<\/strong> and slowly cool and crystallize, forming plutons of intrusive igneous rock (such as granite or diorite).<\/li>\n\n\n\n<li><strong>Erupt explosively or effusively<\/strong> at volcanic arcs, forming stratovolcanoes, island arcs, and other volcanic features.<\/li>\n<\/ol>\n\n\n\n<p>Over time, repeated intrusions and eruptions contribute to the growth of <strong>continental mountain ranges and volcanic arcs<\/strong> (e.g., the Andes, Cascades, and Japanese island arcs). Some of the magma differentiates, evolving into andesitic or rhyolitic compositions due to fractional crystallization, assimilation of continental crust, and magma mixing.<\/p>\n\n\n\n<p>Thus, the <strong>interaction of subducting oceanic lithosphere, volatiles, and mantle melting<\/strong> is the fundamental source of magma that fuels the plutons and volcanoes found in subduction-related mountain belts.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Describe the source of the plutons of magma that rise into mountain ranges and feed volcanoes overlying subduction zones The correct answer and explanation is : The source of the plutons of magma that rise into mountain ranges and feed volcanoes overlying subduction zones is the melting of the mantle wedge above a subducting tectonic [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","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":"","ast-disable-related-posts":"","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":"","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":[25],"tags":[],"class_list":["post-202110","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/202110","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/comments?post=202110"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/202110\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=202110"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=202110"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=202110"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}