Correlation of Early Devonian (Lochkovian-early Pragian) conodont faunas of the South Urals (Russia)

Bulletin of geosciences

Mavrinskaya T¹  Slavík L¹ 

关键词: South Urals;    West Zilair Zone;    Lower Devonian;    global conodont correlation;    Lochkovian;   

DOI  :  

来源: Czech Geological Survey

【 摘 要 】

CarbonatesuccessionsoftheearlyLowerDevonian(Lochkovian-earlyPragian)fromtheMindigulovosection(WestZilairZone,westernslopeoftheSouthUrals)canbegloballycorrelatedusingdiverseconodontfaunas.ThenumberofthedocumentedwidespreadorcosmopolitantaxaoftheLochkovianandearlyPragianageenablesthedefinitionofgloballyrecognizedconodontsuccessionsandtheestablishmentofarefinedregionalconodontbiozonalscale.Thepresentthree-foldglobalsubdivisionoftheLochkovianStagecanbeappliedaswelltothestudiedarea.TheLochkovianintheSouthUralsisrepresentedbytwoHorizons(regionalterminology)withdifferentfaciesdevelopment:1.TheSiyakHorizonofthelowerLochkoviancharacterizedbythedominanceofshallow-waterorganogeniclimestonesofthehesperius-optimaandoptima-omoalphaZones,and2.TheSherlubaiHorizonofthemiddleandupperLochkovianagecharacterizedbythedominanceofcarbonate-terrigenoussuccessions.ThemiddleandupperLochkovianissubdividedintofivebiozones(usingabinominalsystem):omoalpha-eoeleanorae,eoeleanorae-eleanorae,eleanorae-trigonicus,trigonicus-pandorabetaandpandorabeta-sulcatuseta/steinachensis.TheLochkovian-PragianboundaryandtheearlyPragiantimearedeterminedbythepresenceofeognathodontidandicriodontidstocks.TheestablishedregionalconodontzonalscaleintheSouthUralsprovidesasolidbasisforrefinedcorrelationwiththeLochkovian-earlyPragiancarbonaterocksofperi-GondwanaandEuramerica.

【 授权许可】

Unknown