{"id":610,"date":"2023-02-14T11:24:11","date_gmt":"2023-02-14T10:24:11","guid":{"rendered":"http:\/\/www.krantz.unipr.it\/?post_type=product&#038;p=610"},"modified":"2023-02-14T11:30:18","modified_gmt":"2023-02-14T10:30:18","slug":"500-kimberlite","status":"publish","type":"product","link":"http:\/\/www.krantz.unipr.it\/index.php\/prodotto\/500-kimberlite\/","title":{"rendered":"500-Kimberlite"},"content":{"rendered":"<p><strong>DESCRIZIONE:<\/strong><\/p>\n<p>Le kimberliti si rinvengono in tutti i continenti, unicamente in zone cratoniche (Fig.4). Sulla base della loro distribuzione, Clifford (1966), ha osservato che le kimberliti economicamente rilevanti, si rinvengono pi\u00f9 frequentemente nei cratoni Pre-Cambriani, in particolare in quelli di et\u00e0 Archeana (pi\u00f9 vecchi di 2.5 Ga). Questa importante osservazione ha portato alla cos\u00ec detta &#8220;legge di Clifford&#8221;, utile per individuare nuovi depositi di diamanti, e limitare le prospezioni unicamente alle kimberliti affioranti in cratoni Archeani. Non si ha la presenza di kimberliti diamantifere in rocce crostali pi\u00f9 giovani di 1.6 Ga; questa particolare caratteristica, suggerisce probabilmente, uno stretto legame tra la presenza di diamanti, e l\u2019et\u00e0 del mantello sottocrostale. Le kimberliti, rispetto alle rocce incassanti, sono molto pi\u00f9 giovani; la maggior parte ha et\u00e0 Cretacee e Paleozoiche. Si hanno poi esempi anche di kimberliti nel Neogene (alcune datate 22 Ma, in Australia).(fonte http:\/\/www.alexstrekeisen.it\/vulc\/kimberliti.php)<\/p>\n<p><strong>VISTA A 360\u00b0<\/strong><\/p>\n<p><iframe loading=\"lazy\" src=\"https:\/\/www.krantz.unipr.it\/360\/500- Kimberlite\/500- Kimberlite.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; 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; width: 0px; 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Pi\u00f9 semplicemente, le kimberliti, sono un gruppo di rocce ibride che comprende rocce ricche in volatili (prevalentemente CO2), rocce potassiche e rocce ultrabasiche caratterizzate da una tessitura fortemente disequigranulare, data da grandi cristalli immersi in una matrice a grana fine. La prima kimberlite venne scoperta da Vanuxen nel 1837 a Ludlowiville vicono Ithaca, nello stato di New York, in America; il termine kimberlite per\u00f2 fu introdotto solo nel 1887 da Lewis, per descrivere le rocce diamantifere della regione di Kimberly, in Sud Africa.\u00a0<b><span data-contrast=\"auto\"><br \/>\n<\/span><\/b><\/p>\n<p><b><span data-contrast=\"auto\">Descrizione\u00a0<\/span><\/b><b><span data-contrast=\"auto\">microfoto<\/span><\/b><b><span data-contrast=\"auto\">:<br \/>\n<\/span><\/b><\/p>\n<p><strong>prima immagine:\u00a0<\/strong>Fenocristalli (arrotondati e frammentati) di olivina immersi in una matrice (di colore scuro) composta da carbonati. Kimberlite ipoabissale. Udachnaya-East, Sakha-Yakutia (Russia). Immagine a N\/\/, 1x (Lato lungo= 9mm)<\/p>\n<p><strong>seconda immagine:\u00a0<\/strong>Fenocristalli (arrotondati e frammentati) di olivina immersi in una matrice (di colore scuro) composta da carbonati. Kimberlite ipoabissale. Udachnaya-East, Sakha-Yakutia (Russia). Immagine a NX, 1x (Lato lungo= 9mm)<\/p>\n<p><strong>terza immagine:\u00a0\u00a0<\/strong>Fenocristalli (arrotondati e frammentati) di olivina immersi in una matrice (di colore scuro) composta da carbonati. Kimberlite ipoabissale. Udachnaya-East, Sakha-Yakutia (Russia). Immagine a N\/\/, 1x (Lato lungo= 9mm)<\/p>\n<p>Sezioni sottili fonte http:\/\/www.alexstrekeisen.it<\/p>\n","protected":false},"featured_media":611,"template":"","meta":{"_lmt_disableupdate":"","_lmt_disable":""},"product_cat":[22],"product_tag":[],"class_list":{"0":"post-610","1":"product","2":"type-product","3":"status-publish","6":"product_cat-magmatiche-intrusive","8":"first","9":"outofstock","10":"shipping-taxable","11":"product-type-simple"},"_links":{"self":[{"href":"http:\/\/www.krantz.unipr.it\/index.php\/wp-json\/wp\/v2\/product\/610","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.krantz.unipr.it\/index.php\/wp-json\/wp\/v2\/product"}],"about":[{"href":"http:\/\/www.krantz.unipr.it\/index.php\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/www.krantz.unipr.it\/index.php\/wp-json\/wp\/v2\/media\/611"}],"wp:attachment":[{"href":"http:\/\/www.krantz.unipr.it\/index.php\/wp-json\/wp\/v2\/media?parent=610"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"http:\/\/www.krantz.unipr.it\/index.php\/wp-json\/wp\/v2\/product_cat?post=610"},{"taxonomy":"product_tag","embeddable":true,"href":"http:\/\/www.krantz.unipr.it\/index.php\/wp-json\/wp\/v2\/product_tag?post=610"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}