Enigmatic Glass-Like Carbon from the Alpine Foreland, Southeast Germany: A Natural Carbonization Process-中国Betway体育网页登陆

摘要 Unusualcarbonaceousmatter,termedherechiemite,composedofmorethan90%CfromtheAlpineForelandatLakeChiemseeinBavaria,southeasternGermanyhasbeeninvestigatedusingopticalandatomicforcemicroscopy,X-rayfluorescencespectroscopy,scanningandtransmissionelectronmicroscopy,high-resolutionRamanspectroscopy,X-raydiffractionanddifferentialthermalanalysis,aswellasbyδ13Cand14Cradiocarbonisotopicdataanalysis.Inthepumice-likefragments,poorlyorderedcarbonmatterco-existswithhigh-orderingmonocrystallineα-carbyne,andcontainssubmicrometer-sizedinclusionsofcomplexcomposition.Diamondandcarbyneaddtothepeculiarmixofmatter.TherequiredveryhightemperaturesandpressuresforcarbyneformationpointtoashockeventprobablyfromtherecentlyproposedHoloceneChiemgaumeteoriteimpact.Thecarbonmaterialissuggestedtohavelargelyformedfromheavilyshockedcoal,vegetationlikewood,andpeatfromtheimpacttargetarea.Thecarbonization/coalificationhighPTprocessmaybeattributedtoastrongshockthatinstantaneouslycausedthecompleteevaporationandlossofvolatilematterandwater,whichneverthelesspreservedtheoriginalcellularstructureseenfossilizedinmanyfragments.Relativelyfreshwoodencapsulatedinthepurportedstronglyshockedmatterpointtoquenchedcarbonmeltcomponentspossiblyimportantforthediscussionofsurvivaloforganicmatterinmeteoriteimpacts,implyinganastrobiologicalrelationship.

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Enigmatic Glass-Like Carbon from the Alpine Foreland, Southeast Germany: A Natural Carbonization Process

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