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1、ChemicalGeology1571999199±218.Low-temperaturetraceelementmobilityinfluencedbymicrobialactivityÐindicationsfromfracturecalciteandpyriteincrystallinebasementa,)bcEva-LenaTullborg,OveLandstromÈ,BillWallinaDepartmentofGeology,EarthSciencesCentre,GoteborgUniÈÈÍersity,Box460,S-40530Goteborg,SwedenbStuds
2、ÍikEcosafe,S-61182Nykoping,SwedenÈcGeokemaAB,RonnÈÈÍagen9,S-18146Lidingo,SwedenÈReceived21April1997;revised20October1998;accepted20October1998AbstractStableisotopesandtraceelementshavebeenanalysedincalciteandpyrite,fromafracturesurfaceexposedatadepthof200minthePrecambrianbasementofSESweden.Thefract
3、urefillingcalciteprecipitatedfromlow-temperaturesolutionsofatleastfourdifferenthydrochemicalregimes.Incontrasttomanyfracturesinthearea,nohydrothermalactivitywasindicatedinthisfracturemakingtheeffectsoflowtemperatureprocesseseasiertoevaluate.LocalproductionofHCOyby31334anaerobicbacteriaisindicatedfr
4、omlowdC-valuesinthecalcite.ThefindingsofpyritewithpartlylowdSembeddedin13thecalcitesuggestthatthesebacteriamayhavebeensulphatereducers.InversecorrelationofLarYbratiowithdCinthecalcitesuggestsreleaseandincorporationoforganiccomplexedlightREEsinthecalciteproducedasaresultofbiogenicbicarbonateproducti
5、on.HighBacontentsinthefracturefillingmayberelatedtothepresenceoforganicmaterial.AlowbutsignificantmobilityofThisindicated.q1999ElsevierScienceB.V.Allrightsreserved.181334Keywords:Fracturecalcite;Pyrite;Crystallinebasement;Microbialactivity;dO;dC;dS;Traceelements1.Introductionphysio-chemicalconditio
6、nsmakescalciteagoodmediumforrecordingvariationsinsuchconditions.18Calciteisoneofthemostcommonfracturefill-dOanalysesofcalcitesmaygiveinformationaboutingsincrystallinerocksandmayprecipitatefromtemperaturesofformationandtheoriginofthequitedifferentsolutions,rangingfromhydrothermalsolutionfromwhichthe
7、mineralprecipitated,while13fluidstolowtemperaturegroundwaters.ItsquickdCanalysesprovideinformationaboutthecarbon.dissolutionrprecipitationresponsestochangesinsources,e.g.,atmosphericorbiogenic.Stableisotop
