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Kre jdove vimira nnya takozh Krejdovo paleogenove K Pg vimirannya velike vimirannya sho stalosya naprikinci krejdovogo periodu blizko 66 miljoniv rokiv tomu Padinnya kosmichnogo tila na Zemlyu zobrazhene hudozhnikomSkelet tiranozavraIguanodonZagalnoprijnyatoyu vvazhayetsya gipoteza zaproponovana she v 1980 roci 1 grupoyu vchenih pid kerivnictvom Luyisa Alvaresa ta jogo sina Uoltera za yakoyu vimirannya bulo sprichinene udarom masivnogo asteroyida diametrom vid 10 do 15 km 2 3 66 miljoniv rokiv tomu Zitknennya malo rujnivnij vpliv globalne navkolishnye seredovishe golovnim chinom cherez trivalij vpliv impaktnoyi zimi trivalogo periodu holodnoyi pogodi viklikanogo vikidom v atmosferu velikoyi kilkosti ulamkiv sho prizupinila fotosintez u roslinah i planktoni 4 5 Udarna gipoteza takozh vidoma yak gipoteza Alvaresa bula pidkriplena vidkrittyam 180 ti kilometrovogo kratera Chiksulub na pivostrovi Yukatan u Meksikanskij zatoci na pochatku 1990 h rokiv 6 yakij nadav perekonlivi dokazi togo sho osad na mezhi K Pg predstavlyaye soboyu ulamki vnaslidok padinnya asteroyida 7 Fakt odnochasnogo vimirannya bagatoh vidiv takozh ye perekonlivim dokazom togo sho voni buli sprichineni asteroyidom 7 Proekt burinnya vnutrishnogo kilcya kratera Chiksulub u 2016 roci pidtverdiv sho kilce skladalosya z granitu vikinutogo z glibini zemli za licheni hvilini ale majzhe ne mistilo gipsu zvichajnoyi sulfatnoyi porodi morskogo dna v regioni gips viparovuvavsya ta rozsiyuvavsya u viglyadi aerozolyu v atmosferu viklikayuchi dovgostrokovij vpliv na klimat i harchovi lancyuzhki V zhovtni u 2019 roci doslidniki povidomili sho cya podiya shvidko zakislila okeani viklikavshi ekologichnij kolaps i takim chinom sprichinila dovgotrivalij vpliv na klimat stavshi klyuchovoyu prichinoyu masovogo vimirannya naprikinci krejdovogo periodu 8 9 Inshimi prichinami abo faktorami sho spriyali vimirannyu mogli buti Dekanski trapi ta inshi viverzhennya vulkaniv 10 11 zmina klimatu ta zmina rivnya morya Odnak u sichni 2020 roku vcheni povidomili sho klimatichne modelyuvannya podiyi vimirannya nadaye perevagu udaru asteroyida a ne vulkanizmu 12 13 14 Najvidomishim ye vimirannya dinozavriv ale vono bulo lishe chastinoyu velikogo vimirannya razom iz dinozavrami vimerli morski reptiliyi mezozavri ta pleziozavri i pterozavri bagato molyuskiv zokrema amoniti belemniti i bezlich dribnih vodorostej Vsogo zaginulo 16 rodin morskih tvarin 47 rodiv morskih tvarin i 18 rodin suhoputnih hrebetnih Odnak vimirannya ta zvilnennya bagatoh ekologichnih nish vidkrilo novi evolyucijni mozhlivosti pislya nogo bagato grup zaznali adaptivnoyi radiaciyi raptovoyi ta plidnoyi divergenciyi na novi formi ta vidi Ssavci osoblivo uriznomanitnilisya v paleogeni 15 Ptahi yedina grupa vizhivshih dinozavriv takozh shiroko diversifikuvalas utvorivshi vsi suchasni vidi 16 Sered inshih grup divergenciyi zaznali kistkovi ribi 17 bezhvosti zhabi 18 i mozhlivo yashirki 19 Zmist 1 Shema vimirannya 2 Padinnya asteroyida v rajoni Chiksulub 2 1 Dokazi zitknennya 2 2 Efekti zitknennya 2 3 Proekt burinnya kratera Chiksulub v 2016r 3 Alternativni versiyi vimirannya dinozavriv 4 Vidnovlennya ta diversifikaciya 5 Div takozh 6 Dzherela ta primitki 7 PosilannyaShema vimirannya RedaguvatiVimirannya K Pg bulo masshtabnim globalnim shvidkim i vibirkovim sho prizvelo do znishennya velicheznoyi kilkosti vidiv Vihodyachi z morskih skam yanilostej vvazhayetsya sho 75 abo bilshe vsih vidiv vimerli 20 Vimirannya shozhe torknulasya vsih kontinentiv odnochasno Ne ptashini dinozavri napriklad vidomi z maastrihtu Pivnichnoyi Ameriki Yevropi Aziyi Afriki Pivdennoyi Ameriki ta Antarktidi 21 ale nevidomi z kajnozoyu v bud yakij tochci svitu Analogichno vikopnij pilok demonstruye spustoshennya roslinnih ugrupovan u takih viddalenih odin vid odnogo rajonah yak Nyu Meksiko Alyaska Kitaj i Nova Zelandiya 22 Nezvazhayuchi na masshtabnist podiyi isnuvala znachna variativnist u shvidkosti vimirannya mizh riznimi kladami ta vseredini nih Zalezhni vid fotosintezu vidi zanepali abo vimerli oskilki tverdi chastinki v atmosferi blokuvali sonyachne svitlo ta zmenshuvali kilkist sonyachnoyi energiyi sho dosyagaye zemli Sered roslin take vimirannya sprichinilo znachnu perestanovku dominuyuchih grup 23 Sered tvarin vseyidni komahoyidni ta padalniki perezhili vimirannya mozhlivo cherez zbilshennya dostupnosti dzherel yizhi Prote ne vizhilo zhodnogo chisto travoyidnogo chi m yasoyidnogo ssavcya Shvidshe za vse vizhili ssavci ta ptahi harchuvalisya komahami cherv yakami ta ravlikami yaki u svoyu chergu harchuvalisya detritom mertvimi rechovinami roslin i tvarin 24 25 26 U vodojmah z protochnoyu vodoyu vimerlo lishe kilka grup tvarin tomu sho taki bioti ne pokladayutsya bezposeredno na yizhu z zhivih roslin a bilshe na detrit zmitij iz zemli sho zahistilo yih vid vimirannya 27 Podibni ale bilsh skladni modeli buli viyavleni v okeanah Vimirannya bulo bilsh serjoznim sered tvarin sho meshkali u tovshi vodi nizh sered tvarin sho zhili na morskomu dni abo na dni morya Tvarini u tovshi vodi majzhe povnistyu zalezhat vid pervinnoyi produkciyi zhivogo fitoplanktonu todi yak tvarini na dni okeanu zavzhdi abo inodi harchuyutsya detritom 24 Kokolitoforidi ta molyuski vklyuchayuchi amonitiv rudistiv prisnovodnih ravlikiv i midij a takozh ti organizmi sho nimi harchuvalisya vimerli abo zaznali velikih vtrat Napriklad vvazhayetsya sho amoniti buli osnovnoyu yizheyu mozazavriv grupi gigantskih morskih reptilij yaki takozh vimerli 28 Najbilshi vizhivshi tvarini a same krokodilopodibni ta horistoderi buli napivvodnimi ta mali dostup do detritu Suchasni krokodili mozhut zhiti yak padalniki ta vizhivati misyacyami bez yizhi a yihni ditinchata malenki rostut povilno j harchuyutsya perevazhno bezhrebetnimi ta mertvimi organizmami protyagom pershih kilkoh rokiv Ci harakteristiki buli pov yazani z vizhivannyam krokodiliv naprikinci krejdyanogo periodu 25 Pislya vimirannya bioriznomanittya potrebuvalo znachnogo chasu dlya vidnovlennya nezvazhayuchi na isnuvannya velikoyi kilkosti vilnih ekologichnih nish 24 Padinnya asteroyida v rajoni Chiksulub RedaguvatiDokladnishe ChiksulubDokazi zitknennya Redaguvati U 1980 roci grupa doslidnikiv u skladi fizika laureata Nobelivskoyi premiyi Luyisa Alvaresa jogo sina geologa Valtera Alvaresa ta himikiv Frenka Asaro ta Helen Mishel viyavila sho osadovi shari znajdeni po vsomu svitu na mezhi krejdi ta paleogenu mistyat koncentraciyu iridiyu u bagato raziv bilshu za normu u 30 160 ta 20 raziv u troh doslidzhuvanih sekciyah Iridij nadzvichajno ridko zustrichayetsya v zemnij kori oskilki ce siderofilnij element yakij perevazhno zanurivsya razom iz zalizom u yadro Zemli pid chas diferenciaciyi planet Oskilki iridij zalishayetsya bilsh poshirenim u bilshosti asteroyidiv i komet komanda Alvaresa pripustila sho asteroyid vrizavsya v Zemlyu pid chas mezhi K Pg 29 Ranishe buli pripushennya pro mozhlivist udaru 30 ale ce buv pershij perekonlivij dokaz 29 Gipoteza rozglyadalasya yak revolyucijna na moment publikaciyi odnak nezabarom z yavilisya dodatkovi dokazi zitknennya Bulo viyavleno sho granichnij shar K Pg spovnenij dribnih kulok kristalizovanih krapelok rozplavlenoyi porodi utvorenih udarom 31 Shokovij kvarc a ta inshi podibni minerali takozh buli identifikovani na mezhi K Pg 32 33 Inshim dokazom stali identifikaciya osadiv gigantskih cunami vzdovzh uzberezhzhya Meksikanskoyi zatoki ta Karibskogo basejnu 34 yaki dozvolili zrobiti pripushennya sho zitknennya moglo vidbutisya nepodalik yak i toj fakt sho osadovij shar na mezhi K Pg tovstishaye na pivdni Spoluchenih Shtativ z metrovimi sharami ulamkiv sho vidklalisya na pivnochi shtatu Nyu Meksiko 35 Podalshi doslidzhennya viznachili gigantskij krater Chiksulub na uzberezhzhi Yukatanu yak dzherelo osadu na mezhi K Pg Identifikovanij u 1990 roci 36 na osnovi roboti geofizika Glena Penfilda v 1978 roci krater ovalnoyi formi iz serednim diametrom priblizno 180 km bilshij za rozmirom nizh bulo rozrahovano komandoyu Alvaresa 37 U statti 2013 roku Pol Renne z Geohronologichnogo centru Berkli viznachiv datu udaru 66 043 0 011 million rokiv tomu na osnovi argon argonovogo datuvannya Krim togo vin pripustiv sho masove vimirannya vidbulosya protyagom 32 000 rokiv rokiv vid ciyeyi dati 38 Efekti zitknennya Redaguvati U berezni 2010 roku mizhnarodna grupa vchenih proanalizuvala naukovi praci za 20 rokiv ta shvalila gipotezu asteroyida zokrema padinnya Chiksuluba yak prichinu vimirannya viklyuchivshi inshi teoriyi taki yak masivnij vulkanizm Voni viznachili sho asteroyid vid 10 do 15 km vrizavsya v Zemlyu v Chiksulubi na meksikanskomu pivostrovi Yukatan Zitknennya vivilnilo b taku samu energiyu yak 100 teratonn v trotilovomu ekvivalenti 420 zDzh bilsh nizh u milyard raziv bilshe nizh energiya atomnih bombarduvan Hirosimi ta Nagasaki 39 Udar Chiksuluba sprichiniv globalnu katastrofu Deyaki naslidki udaru buli korotkochasnimi yavishami ale takozh buli j trivali geohimichni ta klimatichni zboyi yaki zrujnuvali ekologiyu 40 41 42 Vhodzhennya asteroyida v atmosferu Zemli vklyuchalo korotkij godinnij ale intensivnij impuls infrachervonogo viprominyuvannya sho mig opaliti opromineni organizmi 43 Hocha ce predmet dlya diskusiyi oponenti stverdzhuyut sho lokalni rujnivni pozhezhi jmovirno buli obmezheni Pivnichnoyu Amerikoyu ta znachno postupalis globalnij vognyanij buri Masshtabna svitova pozhezha na mezhi krejdi ta paleogenu ye predmetom okremoyi diskusiyi U statti 2013 roku pri modelyuvanni yadernoyi zimi bulo vislovleno pripushennya sho vihodyachi z kilkosti sazhi v globalnomu shari ulamkiv vsya zemna biosfera mogla goriti sho viklikalo globalnij vikid sazhi v atmosferu yaka zakrila sonce ta stvorila efekt udarnoyi zimi 40 Viniknennya masshtabnih pozhezh postavilo b pid zagrozu isnuvannya organizmiv yaki zmogli vizhiti odrazu pislya zitknennya 44 Krim gipotetichnih naslidkiv pozhezhi ta abo efektu udarnoyi zimi zitknennya moglo utvoriti hmaru pilu yaka blokuvala sonyachne svitlo do roku pereshkodzhayuchi fotosintezu 41 Morozni temperaturi jmovirno trivali shonajmenshe tri roki 42 Na dilyanci v rajoni suchasnoyi richki Brazos temperatura poverhni morya vpala do 7 C 13 F protyagom desyatilit pislya udaru 45 Na rozsiyannya takih aerozoliv neobhidno prinajmni desyat rokiv i ce prizvelo b do zniknennya roslin i fitoplanktonu a zgodom i travoyidnih tvarin ta yihnih hizhakiv Stvorinnya harchovi lancyugi yakih bazuyutsya na detriti mali b horoshi shansi na vizhivannya 46 41 Asteroyid vrizavsya v oblast karbonatnoyi porodi sho mistit veliku kilkist goryuchih vuglevodniv i sirki 47 znachna chastina yakih viparuvalas pri udari tim samim vikinuvshi aerozoli sirchanoyi kisloti v stratosferu sho moglo zmenshiti kilkist sonyachnoyi energiyi yaka dosyagaye poverhni Zemli bilsh nizh na 50 ta sprichinilo kislotni doshi 41 48 V rezultati viniklo zakislennya okeaniv sho privelo do zagibeli bagatoh organizmiv yaki viroshuyut rakovini z karbonatu kalciyu 48 Zgidno z modelyami formaciyi Hell Krik nastannya globalnoyi temryavi dosyaglo b svogo maksimumu lishe za kilka tizhniv i jmovirno trivalo b ponad 2 roki 49 Krim vimirannya zitknennya takozh sprichinilo bilsh zagalni zmini flori ta fauni taki yak poyava biomiv neotropichnih vologih lisiv takih yak Amazoniya zamina vidovogo skladu ta strukturi miscevih lisiv ta protyagom priblizno 6 miljoniv rokiv vidnovlennya do kolishnogo rivnya riznomanitnosti roslin 50 51 Proekt burinnya kratera Chiksulub v 2016r Redaguvati U 2016 roci v ramkah naukovogo burovogo proektu buli otrimani gliboki zrazki kerna porodi z centralnogo kilcya kratera Chiksulub Doslidzhennya zrazkiv pidtverdilo sho girska poroda centralnogo kilcya potrapila pid velicheznij tisk i za licheni hvilini rozplavilasya zi svogo zvichajnogo stanu v svoyu teperishnyu formu Na vidminu vid zvichnih dlya cogo regionu osadovih porid morskogo dna centralne kilce skladayetsya z z granitu sho zazvichaj znahoditsya nabagato glibshe v zemli yakij buv vikinutij na poverhnyu vnaslidok udaru Pri comu gips sulfatovmistna poroda yaka zazvichaj prisutnya na milkomu morskomu dni regionu v zrazkah praktichno vidsutnij jogo bulo majzhe povnistyu viparuvano v atmosferu Krim togo za zitknennyam odrazu sliduvalo megacunami b dostatnye dlya togo shob uklasti tovstij shar pisku bezposeredno nad pikovim kilcem Udarnij element buv dostatno velikim shob stvoriti 190 kilometer wide 120 mi krater rozplaviti ta deformuvati glibokij granit stvoriti peremishennya kolosalnih mas vodi vikinuti velicheznu kilkist ulamkiv viparuvanoyi porodi ta sulfativ v atmosferu de voni zberigalisya b protyagom kilkoh rokiv Take rozpovsyudzhennya pilu ta sulfativ po vsomu svitu katastrofichno vplinulo b na klimat prizvelo b do velikih perepadiv temperaturi ta znishilo harchovi lancyugi 52 53 Alternativni versiyi vimirannya dinozavriv RedaguvatiVersiya chislennih zitknen angl multiple impact event peredbachaye kilka poslidovnih zitknen iz nebesnimi tilami 54 Vona zaluchayetsya zokrema dlya poyasnennya togo sho vimirannya stalosya ne odnomomentno div rozdil Nedoliki gipotez Pobichno na yiyi korist svidchit toj fakt sho asteroyid yakij stvoriv krater Chiksulub virogidno ye lishe odnim z ulamkiv bilshogo nebesnogo tila sho utvoryuyut simejstvo Baptistini 55 Deyaki geologi vvazhayut sho krater Shiva na dni Indijskogo okeanu sho datuyetsya priblizno tim zhe chasom ye naslidkom padinnya inshogo veletenskogo meteorita 56 ale cya tochka zoru ye diskusijnoyu Posilennya vulkanichnoyi aktivnosti 57 z yakoyu pov yazuyut nizku efektiv yaki mogli b vplinuti na biosferu zmina gazovogo skladu atmosferi parnikovij efekt viklikanij vikidom vuglekislogo gazu pri viverzhennyah zmina osvitlenosti Zemli cherez vikidi vulkanichnogo popelu vulkanichna zima Na korist ciyeyi gipotezi svidchat gigantski vilivi magmi mizh 68 i 60 mln rokiv tomu na teritoriyi Indostanu vnaslidok chogo utvorilisya dekanski trapi Rizke znizhennya rivnya morya sho vidbulosya v ostannij Maastrihtskij fazi krejdyanogo periodu maastrihtska regresiya Kombinovani perelicheni vishe prichini mozhut dopovnyuvati odna odnu sho deyakimi doslidnikami vikoristovuyetsya dlya visuvannya riznomanitnih kombinovanih gipotez Napriklad udar gigantskogo meteorita mig sprovokuvati posilennya vulkanichnoyi aktivnosti ta vikid velicheznoyi kilkosti pilu j popelu sho u pidsumku moglo sprichiniti zminu klimatu a ce u svoyu chergu zmini tipu roslinnosti j harchovih lancyugiv i t d Slid mati na uvazi sho trivalist periodu vimirannya ne mozhe buti tochno ocinena cherez efekt Sinjora Lippsa angl Signor Lipps effect pov yazanogo z nepovnotoyu paleontologichnih danih chas pohovannya ostannoyi znajdenoyi skam yanilosti predstavnika taksona mozhe ne vidpovidati chasu zniknennya cogo taksona Vidnovlennya ta diversifikaciya RedaguvatiKrejdovo paleogenove vimirannya malo glibokij vpliv na evolyuciyu zhittya na Zemli Usunennya dominuyuchih krejdovih grup dozvolilo inshim organizmam zajnyati yihnye misce sprichinivshi znachnu diversifikaciyu vidiv protyagom paleogenovogo periodu 58 Najyaskravishij priklad zamina dinozavriv ssavcyami Pislya vimirannya K Pg ssavci shvidko evolyucionuvali shob zapovniti nishi zvilneni dinozavrami Takozh vazhlivo sho v mezhah rodiv ssavciv novi vidi buli priblizno na 9 1 bilshimi pislya granici krejdi paleogenu 59 Inshi grupi takozh suttyevo diversifikuvalisya Na osnovi molekulyarnogo sekvenuvannya ta datuvannya skam yanilostej bagato vidiv ptahiv zokrema grupa Neoaves zaznali adaptivnogo viprominennya pislya mezhi K Pg 60 61 Voni navit stvorili gigantski nelitayuchi formi taki yak travoyidni Gastornis i Dromornithidae a takozh hizhi Phorusrhacidae Vimirannya krejdovih yashirok i zmij mozhlivo prizvelo do evolyuciyi suchasnih grup takih yak iguani varani i udavi 62 Vibuhova diversifikaciya kronovoyi grupi zmij bula pov yazana iz zvilnennyam bagatoh ekologichnih nish ta teritorialnoyu ekspansiyeyu yak na sushi tak i na mori Vimirannya ne ptahovih dinozavriv ta inshih nazemnih hizhakiv dozvolilo zmiyam spovna vikoristati polyuvannya na malenkih hrebetnih tvarin v rannomu kajnozoyi todi yak vimirannya morskih reptilij ta velikih rib moglo stvoriti umovi dlya ekspansiyi zmij u vodni ekosistemi 63 Na sushi z yavilisya gigantski udavi i velichezni madcoyidi a v moryah evolyucionuvali gigantski morski zmiyi Priblizno 88 suchasnih vidiv bezhvostih zhab ye rezultatom adaptivnogo viprominennya yihnih troh osnovnih klad pislya krejdovogo vimirannya 18 Kostisti ribi vibuhovo diversifikuvalisya 64 zapovnyuyuchi nishi yaki zalishilisya vakantnimi vnaslidok vimirannya V epohu paleocenu ta eocenu z yavilisya grupi vitrilnikovih tunciv vugriv ta kambalopodibnih Veliki zmini takozh sposterigayutsya v paleogenovih spilnotah komah Bagato grup murah buli prisutni she v krejdovomu periodi ale v eoceni murahi stali dominuyuchimi ta riznomanitnimi z velikimi koloniyami Meteliki takozh uriznomanitnilisya mozhlivo shob zajnyati misce listoyidnih komah znishenih u 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