{"id":4084,"date":"2021-12-13T22:54:52","date_gmt":"2021-12-13T22:54:52","guid":{"rendered":"https:\/\/www.icterra.pt\/?p=4084"},"modified":"2021-12-13T22:57:10","modified_gmt":"2021-12-13T22:57:10","slug":"petrogenetic-constraints-on-the-felsic-vein-magmatism-in-northern-portugal-based-on-petrological-and-geochemical-data","status":"publish","type":"post","link":"https:\/\/www.icterra.pt\/legacy\/index.php\/2021\/12\/13\/petrogenetic-constraints-on-the-felsic-vein-magmatism-in-northern-portugal-based-on-petrological-and-geochemical-data\/","title":{"rendered":"Petrogenetic constraints on the felsic vein magmatism in northern Portugal based on petrological and geochemical data"},"content":{"rendered":"<p style=\"text-align: justify;\"><span style=\"font-size: 12pt; font-family: arial, helvetica, sans-serif;\">Oliveira, A.J.T., Martins, H.C.B., da Silva, H.M.S.M., 2021.\u00a0Petrogenetic constraints on the felsic vein magmatism in northern Portugal based on petrological and geochemical data.\u00a0Comptes Rendus G\u00e9oscience &#8211; Sciences de la Plan\u00e8te, 353 (1), pp. 377-398&#8243;. https:\/\/doi.org\/10.5802\/crgeos.100<\/span><\/p>\n<div style=\"text-align: justify;\"><span style=\"font-size: 12pt; font-family: arial, helvetica, sans-serif;\">Three of the largest granite porphyries of northern Portugal were studied to improve current knowledge on the regional felsic vein hypabyssal magmatism. All porphyries exhibit microcrystalline groundmasses of variable granularity (composed of quartz, K-feldspar, and muscovite), quartz, K-feldspar, plagioclase, biotite, and cordierite phenocrysts, antirapakivi and rapakivi feldspars, embayments in quartz, and enrichments in rare metal incompatible elements. The veins were emplaced along fractures generated during the last phase of the Variscan orogeny. Textural features were presumably conditioned by fast cooling, volatile loss, subsolidus annealing, and the magnitude of thermal contrasts at the time of emplacement. All veins were altered by subsolidus hydrothermal fluids, as suggested by several petrographic and geochemical evidence. The generation of mantled feldspars is probably related to isothermal decompression andmagma mixing, which is compatible with the\u00a0<span lang=\"el\" title=\"Greek-language text\">\u03b5N<\/span>di signatures (-3.76 to -4.40). Based on this research, both processes have contributed to the petrogenesis of the studied porphyries.<\/span><\/div>\n<div><\/div>\n<div style=\"text-align: justify;\"><span style=\"font-size: 12pt; font-family: arial, helvetica, sans-serif;\">O artigo pode ser consultado em pleno atrav\u00e9s do seguinte link: <a href=\"https:\/\/comptes-rendus.academie-sciences.fr\/geoscience\/articles\/10.5802\/crgeos.100\/\" target=\"_blank\" rel=\"noopener noreferrer\" data-saferedirecturl=\"https:\/\/www.google.com\/url?q=https:\/\/comptes-rendus.academie-sciences.fr\/geoscience\/articles\/10.5802\/crgeos.100\/&amp;source=gmail&amp;ust=1639503631495000&amp;usg=AOvVaw1KD0Mb9bZIhaU_vJlQpMZ0\"><span style=\"font-size: 12pt; font-family: arial;\">https:\/\/comptes-rendus.<wbr \/>academie-sciences.fr\/<wbr \/>geoscience\/articles\/10.5802\/<\/span><wbr \/>crgeos.100<\/a>\/<\/span><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Oliveira, A.J.T., Martins, H.C.B., da Silva, H.M.S.M., 2021.\u00a0Petrogenetic constraints on the felsic vein magmatism in northern Portugal based on petrological and geochemical data.\u00a0Comptes Rendus G\u00e9oscience &#8211; Sciences de la Plan\u00e8te, 353 (1), pp. 377-398&#8243;. https:\/\/doi.org\/10.5802\/crgeos.100 Three of the largest granite porphyries of northern Portugal were studied to improve current knowledge on the regional felsic vein [&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\/4084"}],"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=4084"}],"version-history":[{"count":3,"href":"https:\/\/www.icterra.pt\/legacy\/index.php\/wp-json\/wp\/v2\/posts\/4084\/revisions"}],"predecessor-version":[{"id":4087,"href":"https:\/\/www.icterra.pt\/legacy\/index.php\/wp-json\/wp\/v2\/posts\/4084\/revisions\/4087"}],"wp:attachment":[{"href":"https:\/\/www.icterra.pt\/legacy\/index.php\/wp-json\/wp\/v2\/media?parent=4084"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.icterra.pt\/legacy\/index.php\/wp-json\/wp\/v2\/categories?post=4084"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.icterra.pt\/legacy\/index.php\/wp-json\/wp\/v2\/tags?post=4084"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}