{"id":82669,"date":"2022-09-09T18:34:21","date_gmt":"2022-09-09T15:34:21","guid":{"rendered":"https:\/\/www.lovendal.ro\/wp52\/?p=82669"},"modified":"2022-09-09T18:34:21","modified_gmt":"2022-09-09T15:34:21","slug":"o-fabrica-de-diamante-se-gaseste-in-adancul-pamantului-ce-au-gasit-cercetatorii","status":"publish","type":"post","link":"https:\/\/www.lovendal.ro\/wp52\/o-fabrica-de-diamante-se-gaseste-in-adancul-pamantului-ce-au-gasit-cercetatorii\/","title":{"rendered":"O „fabric\u0103 de diamante” se g\u0103se\u015fte \u00een ad\u00e2ncul P\u0103m\u00e2ntului? Ce-au g\u0103sit cercet\u0103torii…"},"content":{"rendered":"
\"\"<\/a>
Imagine<\/strong>: pixabay.com<\/strong><\/a> (Commons Creative – free) + prelucrare proprie<\/figcaption><\/figure>\n

Zona de grani\u021b\u0103 dintre miezul de metal topit al P\u0103m\u00e2ntului \u0219i mantaua, stratul s\u0103u mijlociu solid, ar putea fi o „fabric\u0103 de diamante”. Un nou experiment de laborator descoper\u0103 c\u0103, la temperaturi \u0219i presiuni extreme, combina\u021bia de fier, carbon \u0219i ap\u0103 – toate ingredientele poten\u021biale g\u0103site la limita dintre miez \u015fi manta – poate forma diamante. Dac\u0103 acest proces are loc \u0219i \u00een ad\u00e2ncul P\u0103m\u00e2ntului, s-ar putea explica unele ciud\u0103\u021benii ale mantalei, ca de exemplu de ce ea are mai mult carbon dec\u00e2t ar trebui s\u0103 fie.<\/p>\n

Descoperirile ar putea ajuta, de asemenea, la explicarea structurilor ciudate ad\u00e2nci \u00een grani\u021ba nucleu-manta, unde undele de la cutremure \u00eencetinesc dramatic. Aceste regiuni, cunoscute sub numele de „zone cu vitez\u0103 ultra joas\u0103” sunt asociate cu structuri ciudate ale mantalei, inclusiv cu cele dou\u0103 forma\u0163iuni uria\u0219e sub Africa \u0219i Oceanul Pacific, care se \u00eentind \u015fi la c\u00e2teva sute de km distan\u0163\u0103. Nimeni nu \u0219tie exact ce sunt aceste forma\u0163iuni, \u00eens\u0103 unii oameni de \u0219tiin\u021b\u0103 cred c\u0103 dateaz\u0103 de 4,5 miliarde de ani \u0219i sunt f\u0103cute din materiale de pe P\u0103m\u00e2ntul str\u0103vechi. Dar noua cercetare sugereaz\u0103 c\u0103 unele dintre aceste zone \u00ee\u0219i pot datora existen\u021ba tectonicii pl\u0103cilor, care probabil a \u00eenceput mult dup\u0103 formarea P\u0103m\u00e2ntului, probabil cu 3 miliarde de ani \u00een urm\u0103.<\/p>\n

Acolo unde miezul se \u00eent\u00e2lne\u0219te cu mantaua, fierul lichid se freac\u0103 de roca solid\u0103. Aceasta este o tranzi\u021bie la fel de dramatic\u0103 precum interfa\u021ba roc\u0103-aer de la suprafa\u021ba P\u0103m\u00e2ntului. La o astfel de tranzi\u021bie, \u00een special la presiuni \u0219i temperaturi ridicate, procese chimice se pot \u00eent\u00e2mpla.<\/p>\n

Mai mult, studiile care folosesc reflexiile undelor de cutremur pentru a vizualiza mantaua au ar\u0103tat c\u0103 materialele din crust\u0103 pot p\u0103trunde p\u00e2n\u0103 la limita nucleu-manta, la aproximativ 3.000 de kilometri sub suprafa\u021ba P\u0103m\u00e2ntului. \u00cen zonele de subduc\u021bie, pl\u0103cile tectonice se \u00eemping unele sub altele, conduc\u00e2nd crusta oceanic\u0103 \u00een subsol. Rocile din aceast\u0103 crust\u0103 oceanic\u0103 au ap\u0103 blocat\u0103 \u00een minerale. Ca rezultat, este posibil ca apa s\u0103 existe \u00een limita miez-manta \u0219i s\u0103 conduc\u0103 reac\u021bii chimice acolo.<\/p>\n

Pentru a testa ideea din cercetare, oamenii de \u015ftiin\u0163\u0103 au reunit ingredientele disponibile \u00een limita miez-manta \u0219i au generat presiuni de p\u00e2n\u0103 la 140 gigapascali. (Aceasta este de aproximativ 1,4 milioane de ori presiunea de la nivelul m\u0103rii.) De asemenea, cercet\u0103torii au \u00eenc\u0103lzit probele la 3.776 de grade Celsius. Sub presiunea \u0219i temperatura limitei miez-manta, apa se comport\u0103 foarte diferit dec\u00e2t face pe suprafa\u021ba P\u0103m\u00e2ntului. Moleculele de hidrogen se despart de moleculele de oxigen. Din cauza presiunii ridicate, hidrogenul graviteaz\u0103 spre fier, care este metalul care alc\u0103tuie\u0219te cea mai mare parte a miezului. Astfel, oxigenul din ap\u0103 r\u0103m\u00e2ne \u00een manta, \u00een timp ce hidrogenul se tope\u0219te cu miezul.<\/p>\n

C\u00e2nd se \u00eent\u00e2mpl\u0103 acest lucru, hidrogenul pare s\u0103 \u00eemping\u0103 deoparte alte elemente u\u0219oare din miez, inclusiv, \u00een mod esen\u021bial, carbonul. Acest carbon este scos din miez \u0219i \u00een manta. La presiuni mari prezente \u00een limita miez-manta, cea mai stabil\u0103 form\u0103 a carbonului este diamantul. \u015ei a\u0219a se formeaz\u0103 diamantul.<\/p>\n

\u00cens\u0103, acestea nu sunt acelea\u0219i diamante care ar putea str\u0103luci \u00eentr-un inel de logodn\u0103; majoritatea diamantelor care \u00ee\u0219i fac drum la suprafa\u021b\u0103 \u0219i, \u00een cele din urm\u0103, devin bijuteriile cuiva, se formeaz\u0103 la c\u00e2teva sute de kilometri ad\u00e2ncime, nu la c\u00e2teva mii. A\u015fadar, diamantele de la grani\u0163a miez-manta sunt probabil plutitoare.<\/p>\n

Mantaua are de trei p\u00e2n\u0103 la cinci ori mai mult carbon dec\u00e2t s-ar a\u0219tepta cercet\u0103torii, pe baza propor\u021biei de elemente din stele \u0219i alte planete. Diamantele g\u0103site \u00een acest strat al P\u0103m\u00e2ntului ar putea explica discrepan\u021ba. Cercet\u0103torii au calculat c\u0103, dac\u0103 chiar \u0219i 10% p\u00e2n\u0103 la 20% din apa din scoar\u021ba oceanic\u0103 ajunge la grani\u0163a dintre miez \u015fi manta, acest lucru ar putea produce suficiente diamante pentru a explica nivelurile de carbon din crust\u0103.<\/p>\n

Cercet\u0103torii \u0219i-au publicat descoperirile pe 11 august 2022 \u00een revista „Geophysical Research Letters”<\/em><\/strong>.<\/p>\n

Sursa<\/strong> (traducerea \u015fi adaptarea proprie): lucrarea \u015ftiin\u0163ific\u0103 „Water-Induced Diamond Formation at Earth’s Core-Mantle Boundary” \/ agupubs.onlinelibrary.wiley.com<\/strong><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Zona de grani\u021b\u0103 dintre miezul de metal topit al P\u0103m\u00e2ntului \u0219i mantaua, stratul s\u0103u mijlociu solid, ar putea fi o „fabric\u0103 de diamante”. Un nou experiment de laborator descoper\u0103 c\u0103, la temperaturi \u0219i presiuni extreme, combina\u021bia de fier, carbon \u0219i … <\/p>\n

Cititi mai multe<\/a><\/p>\n","protected":false},"author":1,"featured_media":82670,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[106],"tags":[235,601,6105,3481,1331,1164,1941,2635,4927,4447,10714,3595,1973,1692,105,6578,732,4943,2364,733,9803,2358],"class_list":["post-82669","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-stiinta","tag-africa","tag-apa","tag-bijuterie","tag-carbon","tag-cutremur","tag-diamant","tag-fier","tag-hidrogen","tag-manta","tag-metal","tag-miez","tag-molecule","tag-oceanul-pacific","tag-oxigen","tag-pamant","tag-placa-tectonica","tag-planeta","tag-presiune","tag-revista","tag-stea","tag-stiinta","tag-temperatura","resize-featured-image"],"yoast_head":"\nO "fabric\u0103 de diamante" se g\u0103se\u015fte \u00een ad\u00e2ncul P\u0103m\u00e2ntului? 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Ce-au g\u0103sit cercet\u0103torii... - Secretele lui Lovendal","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.lovendal.ro\/wp52\/o-fabrica-de-diamante-se-gaseste-in-adancul-pamantului-ce-au-gasit-cercetatorii\/","og_locale":"ro_RO","og_type":"article","og_title":"O \"fabric\u0103 de diamante\" se g\u0103se\u015fte \u00een ad\u00e2ncul P\u0103m\u00e2ntului? Ce-au g\u0103sit cercet\u0103torii...","og_description":"Zona de grani\u021b\u0103 dintre miezul de metal topit al P\u0103m\u00e2ntului \u0219i mantaua, stratul s\u0103u mijlociu solid, ar putea fi o „fabric\u0103 de diamante”. Un nou experiment de laborator descoper\u0103 c\u0103, la temperaturi \u0219i presiuni extreme, combina\u021bia de fier, carbon \u0219i ... 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