{"id":4055,"date":"2021-11-24T09:07:33","date_gmt":"2021-11-24T09:07:33","guid":{"rendered":"https:\/\/www.icterra.pt\/?p=4055"},"modified":"2021-11-24T09:07:33","modified_gmt":"2021-11-24T09:07:33","slug":"unraveling-the-emplacement-history-of-a-portuguese-post-tectonic-variscan-pluton-using-magnetic-fabrics-and-gravimetry","status":"publish","type":"post","link":"https:\/\/www.icterra.pt\/legacy\/index.php\/2021\/11\/24\/unraveling-the-emplacement-history-of-a-portuguese-post-tectonic-variscan-pluton-using-magnetic-fabrics-and-gravimetry\/","title":{"rendered":"Unraveling the emplacement history of a Portuguese post-tectonic Variscan pluton using magnetic fabrics and gravimetry"},"content":{"rendered":"<p style=\"text-align: justify;\"><span style=\"font-size: 12pt; font-family: arial, helvetica, sans-serif;\">Cruz, C., Sant\u2019Ovaia, H., Raposo, M.I.B., Louren\u00e7o, J.M., Almeida, F. &amp; Noronha, F (2021).\u00a0<b>Unraveling the emplacement history of a Portuguese post-tectonic Variscan pluton using fabrics and gravimetry.\u00a0<\/b>Journal of Structural Geology, 153: 104470, 1-22.\u00a0<a href=\"https:\/\/doi.org\/10.1016\/j.jsg.2021.104470\" target=\"_blank\" rel=\"noopener noreferrer\" data-saferedirecturl=\"https:\/\/www.google.com\/url?q=https:\/\/doi.org\/10.1016\/j.jsg.2021.104470&amp;source=gmail&amp;ust=1637774119952000&amp;usg=AOvVaw0YnhCSCAfxVxNRiJorJdLa\">https:\/\/doi.org\/10.1016\/j.jsg.<wbr \/>2021.104470<\/a>\u00a0<\/span><\/p>\n<p style=\"text-align: justify;\">\n<p style=\"text-align: justify;\"><span style=\"font-size: 12pt; font-family: arial, helvetica, sans-serif;\">The Lamas de Olo\u00a0<a class=\"topic-link\" title=\"Learn more about pluton from ScienceDirect's AI-generated Topic Pages\" href=\"https:\/\/www.sciencedirect.com\/topics\/earth-and-planetary-sciences\/pluton\">pluton<\/a>\u00a0is a post-tectonic\u00a0<a class=\"topic-link\" title=\"Learn more about Variscan from ScienceDirect's AI-generated Topic Pages\" href=\"https:\/\/www.sciencedirect.com\/topics\/earth-and-planetary-sciences\/hercynian-orogeny\">Variscan<\/a>\u00a0pluton located in northern Portugal. It is a composite pluton comprising three outcropping\u00a0<a class=\"topic-link\" title=\"Learn more about biotite from ScienceDirect's AI-generated Topic Pages\" href=\"https:\/\/www.sciencedirect.com\/topics\/earth-and-planetary-sciences\/peridotite\">biotite<\/a>\u00a0<a class=\"topic-link\" title=\"Learn more about granites from ScienceDirect's AI-generated Topic Pages\" href=\"https:\/\/www.sciencedirect.com\/topics\/earth-and-planetary-sciences\/granite\">granites<\/a>, similar in mineralogical composition but with different textures and different biotite and\u00a0<a class=\"topic-link\" title=\"Learn more about magnetite from ScienceDirect's AI-generated Topic Pages\" href=\"https:\/\/www.sciencedirect.com\/topics\/earth-and-planetary-sciences\/magnetite\">magnetite<\/a>\u00a0contents: Lamas de Olo, Alto dos Cabe\u00e7os, and Barragem. Two\u00a0<a class=\"topic-link\" title=\"Learn more about magnetic fabric from ScienceDirect's AI-generated Topic Pages\" href=\"https:\/\/www.sciencedirect.com\/topics\/earth-and-planetary-sciences\/magnetic-fabric\">magnetic fabric<\/a>\u00a0techniques,\u00a0<a class=\"topic-link\" title=\"Learn more about anisotropy of magnetic susceptibility from ScienceDirect's AI-generated Topic Pages\" href=\"https:\/\/www.sciencedirect.com\/topics\/earth-and-planetary-sciences\/magnetic-anisotropy\">anisotropy of magnetic susceptibility<\/a>\u00a0and anisotropy of anhysteretic\u00a0<a class=\"topic-link\" title=\"Learn more about remanent magnetization from ScienceDirect's AI-generated Topic Pages\" href=\"https:\/\/www.sciencedirect.com\/topics\/earth-and-planetary-sciences\/remanent-magnetization\">remanent magnetization<\/a>, were used to test the coaxiality of magnetite and biotite fabrics. Comparing both magnetic tensors, the fabric of magnetite and paramagnetic minerals was found to be coaxial. The\u00a0<a class=\"topic-link\" title=\"Learn more about magmas from ScienceDirect's AI-generated Topic Pages\" href=\"https:\/\/www.sciencedirect.com\/topics\/earth-and-planetary-sciences\/magma\">magmas<\/a>\u00a0ascended passively through opening fractures and were controlled by the intersection of ENE-WSW, NNW-SSE and NNE-SSW fault systems. The gravimetric study shows that the Lamas de Olo is an asymmetric, wedge-shaped pluton with a thickness of\u00a0<em>ca.<\/em>\u00a02.5\u20133.5\u00a0km. The kinematic model points to the presence of a feeder zone following an ENE-WSW direction, with two roots for Lamas de Olo and Alto dos Cabe\u00e7os granites. Regarding Barragem granite, several conduits were identified along an NNE-SSW fault system, subparallel to the Ver\u00edn-R\u00e9gua-Penacova fault. Comparing the shape of three post-tectonic biotite plutons with same age and located along the same\u00a0<a class=\"topic-link\" title=\"Learn more about regional structure from ScienceDirect's AI-generated Topic Pages\" href=\"https:\/\/www.sciencedirect.com\/topics\/earth-and-planetary-sciences\/regional-structure\">regional structure<\/a>, the Ver\u00edn-R\u00e9gua-Penacova fault, we observed that the geometry is mainly conditioned by the nature of the host rocks and characteristics of the\u00a0<a class=\"topic-link\" title=\"Learn more about crustal structure from ScienceDirect's AI-generated Topic Pages\" href=\"https:\/\/www.sciencedirect.com\/topics\/earth-and-planetary-sciences\/crustal-structure\">crustal structure<\/a>. Wedge-shaped plutons are intruded into granites, and flat-shaped plutons are hosted in\u00a0<a class=\"topic-link\" title=\"Learn more about metasediments from ScienceDirect's AI-generated Topic Pages\" href=\"https:\/\/www.sciencedirect.com\/topics\/earth-and-planetary-sciences\/metasediment\">metasediments<\/a>.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-size: 12pt; font-family: arial, helvetica, sans-serif;\">Read the <a href=\"https:\/\/doi.org\/10.1016\/j.jsg.2021.104470\">full article<\/a>.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Cruz, C., Sant\u2019Ovaia, H., Raposo, M.I.B., Louren\u00e7o, J.M., Almeida, F. &amp; Noronha, F (2021).\u00a0Unraveling the emplacement history of a Portuguese post-tectonic Variscan pluton using fabrics and gravimetry.\u00a0Journal of Structural Geology, 153: 104470, 1-22.\u00a0https:\/\/doi.org\/10.1016\/j.jsg.2021.104470\u00a0 The Lamas de Olo\u00a0pluton\u00a0is a post-tectonic\u00a0Variscan\u00a0pluton located in northern Portugal. It is a composite pluton comprising three outcropping\u00a0biotite\u00a0granites, similar in mineralogical composition [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"_links":{"self":[{"href":"https:\/\/www.icterra.pt\/legacy\/index.php\/wp-json\/wp\/v2\/posts\/4055"}],"collection":[{"href":"https:\/\/www.icterra.pt\/legacy\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.icterra.pt\/legacy\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.icterra.pt\/legacy\/index.php\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.icterra.pt\/legacy\/index.php\/wp-json\/wp\/v2\/comments?post=4055"}],"version-history":[{"count":1,"href":"https:\/\/www.icterra.pt\/legacy\/index.php\/wp-json\/wp\/v2\/posts\/4055\/revisions"}],"predecessor-version":[{"id":4056,"href":"https:\/\/www.icterra.pt\/legacy\/index.php\/wp-json\/wp\/v2\/posts\/4055\/revisions\/4056"}],"wp:attachment":[{"href":"https:\/\/www.icterra.pt\/legacy\/index.php\/wp-json\/wp\/v2\/media?parent=4055"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.icterra.pt\/legacy\/index.php\/wp-json\/wp\/v2\/categories?post=4055"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.icterra.pt\/legacy\/index.php\/wp-json\/wp\/v2\/tags?post=4055"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}