{"id":581,"date":"2023-02-14T10:42:00","date_gmt":"2023-02-14T09:42:00","guid":{"rendered":"http:\/\/www.krantz.unipr.it\/?post_type=product&#038;p=581"},"modified":"2023-02-14T11:00:16","modified_gmt":"2023-02-14T10:00:16","slug":"487-basalto-leucitico","status":"publish","type":"product","link":"http:\/\/www.krantz.unipr.it\/index.php\/prodotto\/487-basalto-leucitico\/","title":{"rendered":"487-Basalto leucitico"},"content":{"rendered":"<p><strong>DESCRIZIONE:<\/strong><\/p>\n<p>L&#8217;Eifel \u00e8 un altopiano della Germania occidentale, appartenente al Massiccio che si trova al confine con il Belgio e il Lussemburgo. La collisione tra placca europea e africana provoc\u00f2 la fratturazione del vecchio basamento e la risalita di magmi, con sollevamento di tutta l\u2019area. Questi processi hanno causato il vulcnesimo che si estenda su un\u2019ampia area, dalla regione dell\u2019Alvernia nel Massiccio centrale fino in Germania (Eifel) e in Boemia, lungo il rift abortito del Rodano-Reno. I fenomeni magmatici sono di tipo continentale, con magmi provenienti dalla fusione parziale della crosta profonda e del mantello superiore (100-150 km di profondit\u00e0). La zona dell\u2019Eifel comprende circa 240 centri eruttivi che coprono un\u2019area complessiva di 600 km<sup>2<\/sup>; l\u2019attivit\u00e0 vulcanica \u00e8 attualmente dormiente ma non estinta. L\u2019Eifel pu\u00f2 essere divisa in due zone, una Orientale e una Occidentale, simili per quanto riguarda l\u2019evoluzione temporale, spaziale, strutturale e composizionale, ma decisamente diversi per altri parametri.Nella zona Orientale, da cui proviene il campione, l\u2019attivit\u00e0 vulcanica \u00e8 iniziata circa 460.000 anni fa con magmi con composizioni mafiche foiditiche. L\u2019attivit\u00e0 vulcanica si \u00e8 poi spostata verso est circa 215.000-190.000 anni fa con evoluzione dei magmi da basaniti verso composizioni tefritiche. Un importante complesso fonolitico al centro dell\u2019area \u00e8 rappresentato da intrusioni, domi, ignimbriti e abbondante materiale piroclastico. \u00c8 seguito un periodo di scarsa attivit\u00e0 fino a 12.900 anni fa, quando il vulcano Lacheer See erutt\u00f2 pi\u00f9 di 6 km<sup>3<\/sup> di magma, di cui la maggior parte in tre giorni, creando uno strato di materiale piroclastico da caduta riconoscibile dalla Svezia meridionale fino all\u2019Italia settentrionale.<\/p>\n<p><strong>VISTA A 360\u00b0<\/strong><\/p>\n<p><iframe loading=\"lazy\" src=\"https:\/\/www.krantz.unipr.it\/360\/487-Basalto leucitico\/487-Basalto leucitico.html\" width=\"1100\" height=\"700\"><span style=\"display: inline-block; width: 0px; overflow: hidden; line-height: 0;\" data-mce-type=\"bookmark\" class=\"mce_SELRES_start\">\ufeff<\/span><span style=\"display: inline-block; width: 0px; overflow: hidden; line-height: 0;\" data-mce-type=\"bookmark\" class=\"mce_SELRES_start\">\ufeff<\/span><span style=\"display: inline-block; 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