{"id":52045,"date":"2026-09-05T18:36:41","date_gmt":"2026-09-05T18:36:41","guid":{"rendered":"https:\/\/cp.snarskis.lt\/index.php\/2026\/09\/05\/po-anglija-slepesi-milzinas-mokslininkai-atseke-senovini-supervulkana-is-greziniu\/"},"modified":"2026-09-05T18:36:41","modified_gmt":"2026-09-05T18:36:41","slug":"po-anglija-slepesi-milzinas-mokslininkai-atseke-senovini-supervulkana-is-greziniu","status":"publish","type":"post","link":"https:\/\/cp.snarskis.lt\/index.php\/2026\/09\/05\/po-anglija-slepesi-milzinas-mokslininkai-atseke-senovini-supervulkana-is-greziniu\/","title":{"rendered":"Po Anglija sl\u0117p\u0117si mil\u017einas: mokslininkai atsek\u0117 senovin\u012f supervulkan\u0105 i\u0161 gr\u0119\u017eini\u0173"},"content":{"rendered":"

Mokslininkai nustat\u0117, kad po dalimi Anglijos slypi itin senos, kadaise mil\u017eini\u0161kos vulkanin\u0117s sistemos p\u0117dsakai. Ji gal\u0117jo b\u016bti aktyvi ma\u017edaug prie\u0161 454 milijonus met\u0173, ordoviko laikotarpiu, gerokai anks\u010diau nei \u017dem\u0117je pasirod\u0117 dinozaurai.<\/p>\n

Tyr\u0117j\u0173 i\u0161vados remiasi ne naujais gr\u0119\u017einiais, o keli\u0173 de\u0161imtme\u010di\u0173 senumo gr\u0119\u017eini\u0173 branduoli\u0173 m\u0117giniais. Uolienos buvo paimtos i\u0161 dviej\u0173 vietovi\u0173, nutolusi\u0173 apie 65 kilometrus viena nuo kitos, Norfolk ir Linkoln\u0161yre.<\/p>\n

\u012ekal\u010diai slyp\u0117jo cirkonuose<\/h2>\n

Lemiamu \u012frodymu tapo mikroskopiniai cirkono kristalai, randami magmin\u0117se uolienose. Geologams jie ypa\u010d vertingi, nes cirkonuose esantis uranas laikui b\u0117gant prognozuojamai skyla \u012f \u0161vin\u0105, tod\u0117l pagal urano ir \u0161vino santyk\u012f galima tiksliai datuoti kristalo susidarym\u0105.<\/p>\n

\u0160iuo atveju cirkon\u0173 am\u017eius sutapo su \u0161iaur\u0117s Europoje \u017einomu vulkanini\u0173 pelen\u0173 sluoksniu, vadinamu Kinnekulle tefra. Jos p\u0117dsak\u0173 aptinkama pla\u010dioje teritorijoje, \u012fskaitant Skandinavij\u0105 ir Baltijos j\u016bros region\u0105, tad daroma prielaida, kad pelen\u0173 debesis gal\u0117jo nukeliauti \u0161imtus kilometr\u0173.<\/p>\n

Kokia gal\u0117jo b\u016bti erupcija?<\/h2>\n

Pasak tyr\u0117j\u0173, anuometin\u0117 erupcija gal\u0117jo prilygti pa\u010dioms galingiausioms, vadinamoms ultraplinin\u0117ms, kai pelen\u0173 ir duj\u0173 kolonos pasiekia stratosfer\u0105. Tokie i\u0161siver\u017eimai gali t\u0119stis nuo keli\u0173 dien\u0173 iki keli\u0173 savai\u010di\u0173 ir sukelti piroklastinius srautus, sudarytus i\u0161 \u012fkaitusi\u0173 duj\u0173, pelen\u0173 ir uolien\u0173 fragment\u0173.<\/p>\n

Svarbu ir tai, kad prie\u0161 \u0161imtus milijon\u0173 met\u0173 \u017dem\u0117s \u017eemyn\u0173 pad\u0117tis buvo visi\u0161kai kitokia: teritorija, kuri v\u0117liau tapo Anglija, buvo kitose platumose ir \u0161alia tuometini\u0173 j\u016br\u0173 basein\u0173. Tai gal\u0117jo palengvinti pelen\u0173 perna\u0161\u0105 \u012f \u0161iaur\u0119, kur j\u0173 p\u0117dsakai i\u0161liko nuos\u0117din\u0117se storym\u0117se.<\/p>\n

Ar tai tikrai supervulkanas?<\/h2>\n

Ne visi specialistai skuba vartoti termin\u0105 supervulkanas, nes tokiam apibr\u0117\u017eimui paprastai reikia ai\u0161ki\u0173 kriterij\u0173 ir pakankamai duomen\u0173 apie i\u0161mesto med\u017eiagos kiek\u012f. \u0160iuo atveju problema ta, kad per \u0161imtus milijon\u0173 met\u0173 uolienas stipriai paveik\u0117 erozija, jos buvo u\u017eklotos nuos\u0117domis ir deformuotos tektonini\u0173 proces\u0173.<\/p>\n

D\u0117l to \u0161iandien Norfolk ir Linkoln\u0161yro kra\u0161tovaizdyje nematyti nei kraterio, nei vulkanin\u0117s kalvos, kuri i\u0161duot\u0173 tok\u012f praeities mast\u0105. Vis d\u0117lto ekspertai pabr\u0117\u017eia, kad jokios dabartin\u0117s gr\u0117sm\u0117s n\u0117ra: \u0161i sistema nebeaktyvi ne t\u016bkstan\u010dius, o \u0161imtus milijon\u0173 met\u0173.<\/p>\n","protected":false},"excerpt":{"rendered":"

Po Anglijos \u017eeme aptikti 454 mln. met\u0173 senumo mil\u017eini\u0161ko vulkano p\u0117dsakai: cirkon\u0173 analiz\u0117 susiejo juos su pelenais, i\u0161plitusiais po \u0160iaur\u0117s Europ\u0105.<\/p>\n","protected":false},"author":0,"featured_media":52046,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[10],"tags":[4479,35213,874,17965,31416,35429,4715],"miestas":[],"class_list":["post-52045","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mokslas","tag-anglija","tag-cirkonas","tag-geologija","tag-greziniai","tag-ordovikas","tag-supervulkanai","tag-vulkanai"],"acf":[],"_links":{"self":[{"href":"https:\/\/cp.snarskis.lt\/index.php\/wp-json\/wp\/v2\/posts\/52045","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cp.snarskis.lt\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cp.snarskis.lt\/index.php\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/cp.snarskis.lt\/index.php\/wp-json\/wp\/v2\/comments?post=52045"}],"version-history":[{"count":0,"href":"https:\/\/cp.snarskis.lt\/index.php\/wp-json\/wp\/v2\/posts\/52045\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cp.snarskis.lt\/index.php\/wp-json\/wp\/v2\/media\/52046"}],"wp:attachment":[{"href":"https:\/\/cp.snarskis.lt\/index.php\/wp-json\/wp\/v2\/media?parent=52045"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cp.snarskis.lt\/index.php\/wp-json\/wp\/v2\/categories?post=52045"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cp.snarskis.lt\/index.php\/wp-json\/wp\/v2\/tags?post=52045"},{"taxonomy":"miestas","embeddable":true,"href":"https:\/\/cp.snarskis.lt\/index.php\/wp-json\/wp\/v2\/miestas?post=52045"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}