{"id":55632,"date":"2022-08-31T13:42:30","date_gmt":"2022-08-31T10:42:30","guid":{"rendered":"https:\/\/bilimvegelecek.com.tr\/?p=55632"},"modified":"2022-08-31T13:43:09","modified_gmt":"2022-08-31T10:43:09","slug":"kitalarin-olusumu-surecini-bir-kuyrukluyildiz-tetiklemis-olabilir","status":"publish","type":"post","link":"https:\/\/bilimvegelecek.com.tr\/index.php\/2022\/08\/31\/kitalarin-olusumu-surecini-bir-kuyrukluyildiz-tetiklemis-olabilir","title":{"rendered":"K\u0131talar\u0131n olu\u015fumu s\u00fcrecini bir kuyrukluy\u0131ld\u0131z tetiklemi\u015f olabilir"},"content":{"rendered":"

Jeologlar, D\u00fcnya\u2019n\u0131n k\u0131talar\u0131n\u0131n olu\u015fumunu artan kuyrukluy\u0131ld\u0131z \u00e7arp\u0131\u015fmalar\u0131na ve gezegenin galaksinin i\u00e7ine olan yolculu\u011funa ba\u011fl\u0131 olabilece\u011fi uzun d\u00f6nemli d\u00f6ng\u00fcler ke\u015ffetti. Yer kabu\u011fu \u00e7o\u011funlukla mantodan so\u011fuyan ve kat\u0131 kayaya kristalle\u015fen magmadan olu\u015fuyor. Jeologlar kapana k\u0131s\u0131lm\u0131\u015f radyoaktif izotoplar\u0131n bozunmas\u0131na ve bile\u015fimlerine dayanan farkl\u0131 tanelerin ya\u015flar\u0131n\u0131 inceleyerek kabuk olu\u015fumu s\u00fcrecinin izini s\u00fcrebilirler.<\/p>\n

Curtin \u00dcniversitesi taraf\u0131ndan y\u00fcr\u00fct\u00fclen yeni bir \u00e7al\u0131\u015fma i\u00e7in tak\u0131m iki kratondaki -k\u00f6kleri D\u00fcnya\u2019ya y\u00fczlerce mil uzanan ve onlar\u0131 sismik g\u00fc\u00e7lere son derece kararl\u0131 hale getiren \u00e7ok eski kabuk par\u00e7alar\u0131- mineral tanelerinin yap\u0131s\u0131n\u0131 ve ya\u015f\u0131n\u0131 ara\u015ft\u0131rd\u0131. Avusturalyadaki Pilbara ve Greenlandeki Kuzey Atlantik Kratonu, bu b\u00f6lgelerin ikisi de yakla\u015f\u0131k 2.8 ve 3.8 m\u0131lyar y\u0131l aras\u0131nda tarihlendirilmi\u015ftir. Bunu yaparken, bilim insanlar\u0131 kabuk \u00fcretiminin her 170-200 y\u0131l milyon y\u0131lda bir artt\u0131\u011f\u0131n\u0131 \u00f6ne s\u00fcren kal\u0131plar\u0131 g\u00f6zlemlediler. \u015ea\u015f\u0131rt\u0131c\u0131 bir \u015fekilde gezegenin z\u0131t noktalar\u0131nda olmalar\u0131na ra\u011fmen bu iki kratona kar\u015f\u0131 istikrarl\u0131yd\u0131, bu da d\u00f6ng\u00fcn\u00fcn yerli fakt\u00f6rler y\u00fcz\u00fcnden olmad\u0131\u011f\u0131n\u0131 belirtiyor. Bunun d\u0131\u015f\u0131nda ara\u015ft\u0131rmac\u0131lar buldu ki bir galaktik \u00f6l\u00e7ekte ger\u00e7ekle\u015fen bir d\u00f6ng\u00fcn\u00fcn bir sonucuydu.<\/p>\n

\"\"
D\u00fcnya\u2019n\u0131n g\u00f6kadam\u0131z\u0131n sarmal kollar\u0131na hareketiyle birlikte farkl\u0131 olaylar\u0131n nas\u0131l hizaland\u0131\u011f\u0131n\u0131 g\u00f6steren diyagram<\/figcaption><\/figure>\n

Samanyolu g\u00f6akdas\u0131ndaki her \u015fey merkezdeki bir s\u00fcper k\u00fctleli karadelik etraf\u0131nda farkl\u0131 h\u0131zlarda d\u00f6ner. G\u00fcne\u015fimiz ve b\u00fct\u00fcn olarak g\u00fcne\u015f sistemi saniyede 240 km hareket ederken, b\u00fcy\u00fck sarmal kollar saniyede yakla\u015f\u0131k 210 km\u2019de hareket eder. Bu demektir ki periyodik olarak g\u00fcne\u015f sistemi daha yo\u011fun sarmal kollara girip \u00e7\u0131kacak. Peki ne kadar peiyodik? Yakla\u015f\u0131k 200 milyon y\u0131l. Tak\u0131m, kom\u015fumuz sarmal kollardan birine hareket etti\u011finde y\u00fcksek yo\u011funluklu maddenin gravitasyonel etkileri g\u00fcne\u015f sistemini saran Oort bulutundaki malzemeyi sallayabilece\u011fini s\u00f6yl\u00fcyor. Bu objeler kuyruklu y\u0131ld\u0131zlar \u015feklinde i\u00e7 g\u00fcne\u015f sistemine do\u011fru g\u00f6\u00e7 edebilir ve D\u00fcnya ile \u00e7arp\u0131\u015fma \u015fans\u0131n\u0131 artt\u0131r\u0131r.<\/p>\n

“Yepyeni bir \u0131\u015f\u0131k”<\/strong>
\nKuyruklu y\u0131ld\u0131zlar asterodilerden daha y\u00fcksek h\u0131zlarda hareket etmeye meyillidirler ve ekip diyor ki D\u00fcnya\u2019ya \u00e7arpt\u0131klar\u0131nda mantonun y\u00fcksek k\u0131s\u0131mlar\u0131n\u0131 kazarlar ve eritirler, erimi\u015f kayan\u0131n y\u00fczeye \u00e7\u0131kmas\u0131na ve daha yo\u011fun manto malzemesinin \u00fczerinde y\u00fczmesine neden olduklar\u0131n\u0131 s\u00f6yl\u00fcyor. Bu b\u00f6l\u00fcmler so\u011fuduk\u00e7a, daha fazla magma yap\u0131\u015ft\u0131k\u00e7a zamanla b\u00fcy\u00fcyebilen k\u0131tasal kabu\u011fun tohumlar\u0131n\u0131 olu\u015ftururlar. Ara\u015ft\u0131rman\u0131n ba\u015f ara\u015ft\u0131rmac\u0131s\u0131 Profes\u00f6r Chris Kirkland, \u201c\u00c7al\u0131\u015fmam\u0131z d\u00fcnyadaki jeolojik s\u00fcre\u00e7ler ile G\u00fcne\u015f Sisteminin Galaksimizdeki hareketi aras\u0131ndaki heyecan verici bir ba\u011flant\u0131.\u201d diyor. \u201cK\u0131talar\u0131n, hepimizin \u00fczerinde ya\u015fad\u0131\u011f\u0131m\u0131z ve mineral kaynaklar\u0131m\u0131z\u0131n \u00e7o\u011funu buldu\u011fumuz kara k\u00fctlelerinin olu\u015fumunu, G\u00fcne\u015f Sistemi\u2019nin Samanyolu\u2019ndan ge\u00e7i\u015fine ba\u011flamak gezegenimizin bi\u00e7imlendirici tarihine ve bulundu\u011fu yere yepyeni bir \u0131\u015f\u0131k tutuyor.\u201d Daha fazla kan\u0131t, \u00e7arpmalar\u0131n bas\u0131nc\u0131 ve \u0131s\u0131s\u0131 kayay\u0131 buharla\u015ft\u0131rd\u0131\u011f\u0131nda ve ard\u0131ndan tekrar ya\u011fmur ya\u011fd\u0131\u011f\u0131nda \u00fcretilen malzeme konsantrasyonlar\u0131n\u0131 i\u00e7eren k\u00fcresel yataklar\u0131n \u00e7a\u011flar\u0131nda mevcut olabilir. Ekip, baz\u0131 k\u00fcresel yataklar ile g\u00fcne\u015f sisteminin 3.25 ve 3.45 milyar y\u0131l \u00f6nce sarmal bir kola ge\u00e7ti\u011fi zamanlar aras\u0131nda bir korelasyon oldu\u011funu s\u00f6yl\u00fcyor. Ara\u015ft\u0131rmaya g\u00f6re sarmal bir kolla en son kar\u015f\u0131la\u015ft\u0131\u011f\u0131m\u0131zda yakla\u015f\u0131k 66 milyon y\u0131l \u00f6nceydi, b\u00fcy\u00fck bir asteroit veya kuyruklu y\u0131ld\u0131z\u0131n D\u00fcnya\u2019ya \u00e7arparak dinozorlar\u0131 yok etmesiyle \u00fcnl\u00fcyd\u00fc.<\/p>\n

Kaynak: Study links continent creation to 200-million year galactic comet cycle, New Atlas<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

Jeologlar, D\u00fcnya\u2019n\u0131n k\u0131talar\u0131n\u0131n olu\u015fumunu artan kuyrukluy\u0131ld\u0131z \u00e7arp\u0131\u015fmalar\u0131na ve gezegenin galaksinin i\u00e7ine olan yolculu\u011funa ba\u011fl\u0131 olabilece\u011fi uzun d\u00f6nemli d\u00f6ng\u00fcler ke\u015ffetti. Yer kabu\u011fu \u00e7o\u011funlukla mantodan so\u011fuyan ve kat\u0131 kayaya kristalle\u015fen magmadan olu\u015fuyor. Jeologlar kapana k\u0131s\u0131lm\u0131\u015f radyoaktif izotoplar\u0131n bozunmas\u0131na ve bile\u015fimlerine dayanan farkl\u0131 tanelerin ya\u015flar\u0131n\u0131 inceleyerek kabuk olu\u015fumu s\u00fcrecinin izini s\u00fcrebilirler. Curtin \u00dcniversitesi taraf\u0131ndan y\u00fcr\u00fct\u00fclen yeni bir \u00e7al\u0131\u015fma […]<\/p>\n","protected":false},"author":3113,"featured_media":55634,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[30,19],"tags":[],"class_list":["post-55632","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-astronomi","category-bilim-gundemi"],"acf":[],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t