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Paleocen dr grech palaios drevnij kainos novyj pervaya epoha paleogenovogo perioda i vsej kajnozojskoj ery Ohvatyvaet vremya ot 66 0 do 56 0 millionov let nazad Za paleocenom sleduet eocen Chast geologicheskoj istorii ZemliPaleocenovaya epoha sokr Paleocen66 56 mln let nazad Paleogen Neogen ChTitanoides primaevus rekonstrukciyaGeohronologicheskie dannyeEon FanerozojEra KajnozojDlitelnost 10 mln letKlimatSrednyaya temperatura 24 CVerhnij melEocen Paleocen nachalsya s mel paleogenovogo vymiraniya kotoroe unichtozhilo 75 vidov zhivyh organizmov na planete vklyuchaya dinozavrov Konec epohi priurochen k paleocen eocenovomu termicheskomu maksimumu krupnomu klimaticheskomu sobytiyu v hode kotorogo v atmosferu i okean popalo okolo 2 5 4 5 trln tonn ugleroda chto vyzvalo globalnoe povyshenie temperatury i podkislenie okeanov V paleocene kontinenty severnogo polushariya byli soedineny neskolkimi suhoputnymi mostami Yuzhnaya Amerika Antarktida i Avstraliya tozhe byli eshyo ne vpolne razdeleny Skalistye gory prodolzhali podyom Indijskaya plita nachala stolknovenie s Aziej Vymiranie na granice melovogo i paleogenovogo periodov privelo k znachitelnomu izmeneniyu fauny i flory Srednyaya globalnaya temperatura paleocena sostavlyala okolo 24 25 C vposledstvii ona opustilas do 12 C Po vsej Zemle rosli lesa v tom chisle v polyarnyh oblastyah naprimer na ostrove Elsmir V pervoj polovine paleocena eshyo skazyvalis posledstviya katastrofy i fauna byla predstavlena melkimi mlekopitayushimi i v celom nebolshimi zhivotnymi vidovoe bogatstvo bylo nizkim po sravneniyu s melovym periodom Iz za otsutstviya krupnyh travoyadnyh lesnoj pokrov byl dovolno gustym Paleocen stal vremenem rascveta mlekopitayushih V eto vremya zhili drevnejshie izvestnye placentarnye i sumchatye V moryah kak v otkrytom more tak i v rifovyh biomah stali dominirovat luchepyorye ryby Istoriya izucheniyaPaleocen byl vydelen iz sostava eocena v 1874 godu Eto sdelal nemeckij paleobotanik Geologiyasistema otdel yarus Nizhnyaya granica mln letNeogen Miocen Akvitanskij 23 03Paleogen Oligocen 27 8233 9Eocen Priabonskij 37 71Bartonskij 41 2Lyutetskij 47 8Iprskij 56 0Paleocen Tanetskij 59 2Zelandskij 61 6Datskij 66 0Mel Verhnij Maastrihtskij bolsheDelenie i zolotye gvozdi v sootvetstvii s IUGS po sostoyaniyu na sentyabr 2023 goda Granica melovogo i paleogenovogo periodov otchyotlivo zapechatlena v geologicheskih formaciyah v raznyh tochkah planety Eto tak nazyvaemaya iridievaya polosa svetlogo ottenka tochnee s povyshennym soderzhaniem iridiya i svyazannye s nej razryvy v iskopaemoj flore i faune Iridij redko vstrechayushijsya na Zemle metall i v bolshih kolichestvah mozhet vypast na zemnuyu poverhnost tolko ot udarov krupnyh meteoritov S etim svyazyvayut meteoritnyj krater Chiksulub v kotoryj udaril meteorit diametrom do 15 km Iridievaya polosa belogo cveta reka Vajoming Granica mel paleogena Park Trinidat Lejk shtat Kolorado SShA Granica melovogo i paleogenovogo periodov eto kremovaya tonkaya polosa srazu posle vystupayushej porody tyomnogo cveta Posle polosy sleduet uzhe zametno bolee svetlyj sloj kamnya Paleontologi razdelyayut paleocen na tri veka Datskij ot 66 do 61 6 mln let nazad Zelandskij ot 61 6 do 59 2 mln let nazad i tanetskij ot 59 2 do 56 mln let nazad Paleocen zavershilsya tak zhe vymiraniem nachavshimsya s temperaturnogo maksimum paleocena eocena proizoshlo zakislenie okeana iz za vybrosov ugleroda v atmosferu i okeany vymerlo do 50 foraminifer eto proizoshlo 55 8 mln let nazad Mestorozhdeniya poleznyh iskopaemyh Neskolko ekonomicheski vazhnyh mestorozhdenij uglya formirovalis v techenie paleocena bassejn River v shtate Vajoming i Montana na eto mestorozhdenie prihoditsya 43 amerikanskoj dobychi uglya Uilkoks v Tehase i bassejn v Kolumbii gde raspolozhen samyj bolshoj karer v mire Tak zhe ugol obrazovavshijsya v paleocene dobyvayut na Shpicbergene v Norvegii i Kanade Prirodnyj gaz obrazovavshijsya v paleocene sostavlyaet znachitelnye zapasy v Severnom more 2 23 trln kubicheskih metrov V etom zhe meste sosredotochena paleocenovaya neft 13 54 mlrd barrelej Vazhnye zapasy fosfatov frankolit paleocena sosredotocheny v Tunise PaleogeografiyaPaleotektonika Goroobrazovanie vyzvannoe subdukciej okeanicheskoj kory pod Severo Amerikanskoj plitoj V paleocene kontinenty eshyo ne nahodilis na sovremennyh poziciyah V Severnom polusharii byvshie chasti Lavrazii Severnaya Amerika i Evraziya poroj soedinyalis suhoputnymi pereshejkami Beringiya mezhdu 65 5 i 58 mln let nazad Tak zhe sushestvoval De Geer peresheek mezhdu Grenlandiej i Skandinaviej mezhdu 71 i 63 mln let nazad Severnaya Amerika tak zhe byla soedinena s Zapadnoj Evropoj cherez Grenlandiyu mezhdu 57 i 55 8 mln let nazad i cherez Turgajskij marshrut soedinyavshij Evropu i Aziyu Raspad Gondvany A rannij mel V pozdnij mel S paleocen D sovremennost Goroobrazovanie vklyuchalo v sebya rost Skalistyh gor nachavshijsya v melovom periode i zakonchivshijsya v konce paleocena Iz za etogo processa i padeniya urovnya morya Zapadnoe Vnutrennee more razdelyavshee ranee Severnuyu Ameriku otstupilo Mezhdu 60 5 i 54 5 mln let nazad v Severnoj Atlantike byla povyshennaya vulkanicheskaya aktivnost tretya po moshnosti za poslednie 150 mln let v rezultate etogo processa obrazovalas Severo Atlanticheskaya magmaticheskaya provinciya Grenlandskaya plita nachala rashoditsya s Severo Amerikanskoj plitoj byli zatronuty zalezhi klatratov metana dissociaciya klatratov eto vyzvalo massovoe vydelenie ugleroda Severnaya i Yuzhnaya Amerika v paleocene byli otdeleny drug ot druga no uzhe 73 mln let nazad sformirovalas ostrovnaya duga Yuzhno Centralnoamerikanskaya duga V Karibskom bassejne tektonicheskaya plita dvigalas na vostok a Severo Amerikanskaya i Yuzhno Amerikanskaya plity dvigalis v protivopolozhnom napravlenii Etot process privedyot v itoge k povysheniyu Panamskogo pereshejka ko vremeni 2 6 mln let nazad Karibskaya plita prodolzhala dvizhenie primerno do 50 mln let nazad Chasti byvshego kontinenta Gondvany v Yuzhnom polusharii prodolzhali otdalyatsya drug ot druga no Antarktida byla soedinena s Yuzhnoj Amerikoj i Avstraliej Afrika dvigalas na sever v storonu Evropy Indijskij subkontinent dvigalsya v storonu Azii i v itoge on zakroet okean Tetis Osobennosti okeanov v paleocene V sovremennyj period tropicheskaya voda stanovitsya holodnee i povyshaetsya eyo solyonost u polyusov eto vyzyvaet opuskanie ranee tyoploj vody nizhe i obrazovanie holodnogo techeniya Dannye processy vyrazheny v Severnoj Atlantike vblizi Severnogo polyusa i v regione Antarktidy V paleocene vodnye techeniya mezhdu Severnym ledovitym okeanom i Severnoj Atlantikoj byli bolee ogranicheny poetomu glubokovodnoe severoatlanticheskoe techenie i atlanticheskaya meridionalnaya cirkulyaciya holodnogo i tyoplogo techenij eshyo ne sformirovalis Iz za etogo obrazovanie glubinnyh holodnyh techenij eshyo ne proishodilo v Severnoj Atlantike V paleocene v silu togo chto Antarktida Avstraliya i Yuzhnaya Amerika byli soedineny mezhdu soboj ne obrazovalos cirkumpolyarnoe techenie ono v svoyu ochered zamknulo oborot holodnoj vody vokrug Antarktidy i pozdnee sdelalo kontinent krajne holodnym ego ne progrevayut teplye techeniya mirovogo okeana KlimatKlimat paleocena byl takim zhe kak v melovom periode tropicheskij i subtropicheskij na vsej planete za isklyucheniem polyusov na meste nyneshnej Antarktidy i Arktiki byl umerennyj klimat ldov ne sushestvovalo Srednyaya globalnaya temperatura 24 25 C dlya sravneniya srednyaya globalnaya temperatura mezhdu 1951 1980 sostavila 14 C Globalnaya temperatura glubokih sloyov okeana byla mezhdu 8 12 C v sovremennyj period temperatura ravna 0 3 C Uroven uglekislogo gaza sostavlyal v srednem 352 ppm eto pokazatel dlya shtata Kolorado v SShA Srednij pokazatel po planete byl 616 ppm Umerennyj prohladnyj klimat Antarktida Avstraliya Yuzhnaya Amerika eyo yuzhnaya chast segodnya takoj klimat v SShA Kanade V Vostochnoj Sibiri i Evrope umerenno tyoplyj klimat Yuzhnaya Amerika Severnaya i Yuzhnaya Afrika Yuzhnaya Indiya Mezoamerika Kitaj zasushlivyj klimat Sever Yuzhnoj Ameriki Centralnaya Afrika Severnaya Indiya Srednyaya Sibir Sredizemnoe more tropicheskij klimat Klimaticheskie sobytiya paleocena Posle udara meteorita i posleduyushego vulkanizma 66 mln let nazad nastupil holodnyj period v klimate no on prodlilsya otnositelno nedolgo i posle prohozhdeniya granicy mel paleogenovogo vymiraniya otnositelno bystro prishyol v normu Srok osobo holodnogo perioda 3 goda Vozvrashenie v normu proishodilo v techenie desyatkov let za 10 let perestali idti kislotnye dozhdi no okean ponyos bolshij uron sudya po sootnosheniyu izotopov ugleroda S13 i S 12 oborot ugleroda v glubokovodnyh vodah prekratilsya Okean pokazyvaet nizkuyu produktivnost snizhenie deyatelnosti fitoplanktona 65 2 mln let nazad v rannem Daniane na protyazhenii 100 000 let znachitelnye obyomy ugleroda stali nakaplivatsya v glubokovodnyh sloyah okeanov i morej S serediny Maastrihtskogo perioda uvelichenie ugleroda v glubokih vodah narastalo Zatem proizoshyol vybros ugleroda v silu togo chto tepleyushaya voda ne mogla usvaivat ugleroda bolshe opredelyonnogo poroga V etot period savanna vytesnila lesnye massivy 62 2 mln let nazad v pozdnem Daniane proizoshlo poteplenie i nachalos podkislenie okeanov svyazannoe s uvelicheniem soderzhaniya ugleroda Eto prodolzhalos 200 000 let i vyzvalo povyshenie temperatury po vsej tolshe vody na 1 6 2 8 C Sobytie sovpadaet tak zhe s vulkanicheskoj aktivnostyu v Atlanticheskom okeane i v Grenlandii Globalnye srednie temperatury dlya sushi 60 5 mln let nazad fiksiruetsya padenie urovnya morya no poskolku lednikov v tot period ne bylo voobshe novye ldy ne poyavlyalis obyasnenie etomu v usilenii ispareniya vody v atmosferu 59 mln let nazad temperatura rezko povysilas prichina vybros glubokovodnogo metana v atmosferu i okean Nakoplenie metana shlo okolo 10 11 tys let posledstviya vybrosa prodolzhalis 52 53 tys let Spustya 300 000 let sluchilsya povtornyj vybros metana kolichestvom do 132 mlrd tonn temperatura povysilas na 2 3 C Eto vyzvalo povyshennuyu sezonnost i nestabilnost klimata Odnako takie usloviya stimulirovali rost travy v nekotoryh rajonah Globalnye temperatury dlya okeanov Teplovoj maksimum na granice paleocena i eocena dlilsya 200 000 let Globalnaya srednyaya temperatura podnyalas na 5 8 C v srednih i polyarnyh shirotah stalo teplee chem v sovremennyh tropikah do 24 29 C Eto bylo vyzvano vybrosom v atmosferu 2 5 4 5 trln tonn ugleroda vybros sluchilsya iz za vysvobozhdeniya metan gidratov v severnoj chasti Atlanticheskogo okeana Eto svyazano s tektonicheskoj aktivnostyu v regione Metangidraty vybrasyvalis 2500 let v okeane povysilas kislotnost techeniya zamedlyalis i eto vyzyvalo rasshirenie zon s minimalnym soderzhaniem kisloroda na bolshih glubinah Na melkovode v silu povysheniya temperatury tak zhe padalo soderzhanie kisloroda v vode a produktivnost okeana v celom vyrosla v silu povysheniya temperatury Voznikla ostraya konkurenciya za kislorod v rezultate razvivalis sulfatreduciruyushie bakterii oni sozdayut kak othody vysokotoksichnyj serovodorod Kak itog obyom vody s povyshennym soderzhaniem sulfatov vyros do 10 20 obyoma vsego okeana v sovremennyj period obyom takoj vody sostavlyaet 1 odin iz primerov eto dno Chyornogo morya Vdol kontinentov obrazovalis zony hemoklina harakterizuyushegosya beskislorodnymi vodami v kotoryh mogut zhit tolko anaerobnye organizmy Na sushe eti sobytiya vyzvali v tom chisle umenshenie razmerov mlekopitayushih kak otvet na povyshenie temperatury Paleocen eocenovyj teplovoj maksimum Podrobno rassmotren Paleocen eocenovyj termicheskij maksimumRastitelnostPo vsej planete rosli vlazhnye tropicheskie i subtropicheskie lesa Sostav porod derevev osnovnaya massa hvojnye i na vtorom meste shirokolistvennye Tak zhe byli savanny mangrovye bolota sklerofitnye lesa K primeru v Kolumbii formaciya Serrehon po vidam rastenij byla pohozha na sovremennuyu palmy bobovye malvovye i aroidnye V rezultate vymiraniya krupnyh dinozavrov i v celom vymiraniya vseh zhivotnyh krupnee 25 kg lesa stali rasti namnogo gushe kolichestvo ravninnyh otkrytyh uchastkov sokratilos do predela Rasteniya pri etom stolknulis s problemami gustoj polog ne propuskal mnogo solnechnogo sveta i nachalis adaptacii nizkih rastenij k novym usloviyam Poyavilis vidy rastenij parazitov derevya stali vyrastat vyshe chtoby ostavatsya s dostupom k solnechnomu svetu Na granice melovogo i paleocenovogo periodov fiksiruetsya znachitelnoe vymiranie vidov rastenij Primer v bassejne reki Uilliston v Severnoj Dakote vymerlo do 60 vidov V rezultate obychnye dlya melovogo perioda araukarievye smenilis na podokarpovye hvojnye a do etogo redkie hvojnye Cheirolepidiaceae stali dominirovat v Patagonii Sloi otlozhenij perekryvayushie granicu mel paleocena bogaty okamenevshimi paporotnikovymi Paporotniki obychno pervymi koloniziruyut rajony podvergnuvshiesya vygoraniyu pri pozharah Vosstanovlenie rastenij posle mel paleogenovogo vymiraniya Posle okonchaniya melovogo perioda v paleocene fiksiruetsya ischeznovenie znachitelnogo chisla vidov rastenij V bassejne Uillistona v Severnoj Dakote vymerlo do 60 vidov Do granicy vymiraniya Araukarii byli obychnymi dlya ogromnyh prostranstv na planete no zatem byli zameneny hvojnymi Podokarpovymi Redkie do etogo Cheirolepidiaceae stali dominirovat Geologicheskie sloi pokryvayushie vymiranie mel paleogena imeyut mnogo okamenelostej paporotnikov Delo v tom chto paporotniki v silu neprihotlivosti i otnositelno vysokoj zhivuchesti pervymi zanovo koloniziruyut rajony kotorye postradali ot lesnyh pozharov Poetomu nalichie bolshogo chisla paporotnikov govorit o tom chto na granice vymiraniya byli massovye lesnye pozhary i derevya byli unichtozheny po ocenke pozhary mogli ohvatit vsyu planetu V silu otnositelno bystrogo vosstanovleniya lesov i otsutstviya krupnyh zhivotnyh kotorye by obedali rastushie derevya travyanistye rasteniya stali luchshe vyzhivat esli mogli byt tenelyubivymi Podlesok novyh lesov sostoyal iz likopodij paporotnikov i pokrytosemennyh kustarnikov Lesa pri vsej ogromnoj ploshadi ves paleocen byli bedny vidami rastenij raznoobrazie vidov vosstanavlivalos medlenno i prishlo v normu tolko k koncu perioda spustya 10 mln let Cvetkovye rasteniya imevshiesya v Golarkticheskoj oblasti bolshaya chast Severnogo polushariya Metasekvojya Gliptostrobus Makginit Platan Kari Ampelopsis i Cercidifillum No vosstanovlenie lesnogo pokrova proizoshlo po merkam biosfery bystro tak Kasl Rok v Kolorado byl pokryt tropicheskim lesom vsego cherez 1 4 mln let posle vymiraniya Odnako v lesah bylo malo nasekomyh chto dokazano po Kolumbijskoj formacii Serrehon s datirovkoj 58 mln let nazad Eto govorit o tom chto ekosistema byla ne sbalansirovannoj bolshaya zelyonaya massa rastenij ne obespechivala raznoobrazie pitaniya dlya ostavshihsya v zhivyh zhivotnyh FaunaV paleocene i eocene zhili miacidy primitivnye hishnye ot kotoryh predpolozhitelno proizoshli vse sovremennye hishnye mlekopitayushie V pozdnem melovom periode ili rannem paleocene iz parnokopytnyh predpolozhitelno vydelilis predki drevnih kitov Cherez 100 tys let posle padeniya meteorita taksonomicheskoe raznoobrazie mlekopitayushih udvoilos a maksimalnaya massa mlekopitayushih uvelichilas pochti do urovnej predshestvuyushih mel paleogenovomu vymiraniyu Priblizitelno tryohkratnoe uvelichenie maksimalnoj massy tela mlekopitayushih proizoshlo cherez 300 tys let posle mel paleogenovogo vymiraniya pervye krupnye mlekopitayushie poyavilis cherez 700 tysyach let posle mel paleogenovogo vymiraniya chto sovpadaet s pervym poyavleniem rastenij semejstva bobovyh V pozdnem paleocene ot kondilartr proizoshli neparnokopytnye PaleogeografiyaTretya i poslednyaya faza fragmentacii superkontinenta Pangei proishodila v rannem kajnozoe Severnaya Amerika i Grenlandiya prodolzhali otdelyatsya ot Evrazii rasshiryaya Atlanticheskij okean V to vremya kak Atlantika rosla drevnij okean Tetis zakryvalsya iz za sblizheniya Afriki i Evrazii Severnaya Amerika i Yuzhnaya Amerika byli razdeleny ekvatorialnymi moryami vplot do vtoroj poloviny neogena Afrika Yuzhnaya Amerika Antarktida i Avstraliya prodolzhali rashoditsya Indijskij subkontinent nachal svoj drejf k Azii chto privelo k tektonicheskomu stolknoveniyu i obrazovaniyu Gimalaev Morya kotorye pokryvali chast Severnoj Ameriki i Evrazii sokratilis v nachale paleocena otkryv novye mesta obitaniya dlya nazemnoj flory i fauny Sm takzhePaleocen eocenovyj termicheskij maksimumPrimechaniyaInternational Chronostratigraphic Chart angl International Commission on Stratigraphy mart 2020 23 fevralya 2021 goda Thomas A Stidham Jaelyn J Eberle The palaeobiology of high latitude birds from the early Eocene greenhouse of Ellesmere Island Arctic Canada angl Scientific Reports 2016 02 12 Vol 6 iss 1 P 1 8 ISSN 2045 2322 doi 10 1038 srep20912 24 sentyabrya 2019 goda Stanislav Drobyshevskij Antropologiya Purgatorius 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