Izotopska geokemija inkrustacij CaCO3 v Taylorjevi dolini na Antarktiki: izsledki, ki nakazujejo njihov izvor
DOI:
https://doi.org/10.3986/AGS.7233Ključne besede:
kalcijev karbonat, izotopsko razmerje, nanos soli, McMurdove suhe doline, AntarktikaPovzetek
Inkrustacije kalcijevega karbonata (CaCO3) so značilne za večino puščavskih prsti, tudi polarnih, v njih pa so ohranjeni podatki o geokemičnih, hidroloških in atmosferskih procesih, ki so vplivali na te prsti. Zbrali smo niz inkrustacij CaCO3, odkritih pod površinskimi kamninami v prsteh in tilih v Taylorjevi dolini – eni izmed McMurdovih suhih dolin na Antarktiki (~78°j.z.š.). Analizirali smo vsebnost 87Sr/86Ster δ18O in δ13C v teh inkrustacijah, da bi ugotovili, kako so povezane s spodaj ležečimi prstmi in materialom, s katerim so v stiku, ter določili procese, ki uravnavajo njihov nastanek. Razen v enem primeru izotopski podatki kažejo, da Sr v teh inkrustacijah ne izvira iz kamnine, s katero je inkrustacija povezana. Glavni viri Sr (in po analogiji tudi Ca) so bodisi prah, ki ga je nanesel veter, bodisi agregati ledeniških sedimentov (tilov) v prsteh. V inkrustacijah iz Taylorjeve doline je bilo od 5,7 do 11‰ δ13C, kar se ujema z vsebnostjo ogljika iz atmosferskega CO2. Vrednosti δ18O so od –8,1 do –11,2‰, to pa je več, kot bi pričakovali za uravnoteženo izločanje kalcita iz meteornih vod v Taylorjevi dolini. Skupni rezultati kažejo, da je CaCO3nastal s hitrim izhlapevanjem slojev pod klasti, prenasičenimi s CaCO3.
Prenosi
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