Long memory of mantle

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1、Lithos120(2010)131–143ContentslistsavailableatScienceDirectLithosjournalhomepage:www.elsevier.com/locate/lithosLongmemoryofmantlelithospherefabric—EuropeanLABconstrainedfromseismicanisotropyJaroslavaPlomerová⁎,VladislavBabuškaGeophysicalInstitute,AcademyofSciencesoftheCzech

2、Republic,14131Praha4,CzechRepublicarticleinfoabstractArticlehistory:WepresentauniformupdatedmodeloftheEuropeanlithosphere–asthenosphereboundary(LAB)Received15May2009recalculatedfromdatacollectedduringourregionalstudiesofseismicanisotropyandothertomographicAccepted11January2

3、010experiments,andshowresultsofmappingoflarge-scaledomainsofmantlelithospherecharacterizedbyAvailableonline25January2010uniformfossilfabrics.Exploitingthelongmemoryofthefabricofthedeepcontinentallithosphere,wedefinetheLABasaboundarybetweenafossilanisotropyinthelithosphericma

4、ntleandanunderlyingseismicKeywords:anisotropyrelatedtopresent-dayflowintheasthenosphere.AnalysisofstatictermsofteleseismicP-waveLithosphere–asthenosphereboundarytraveltimedeviationsshowsthattheLABtopographyismoredistinctbeneaththePhanerozoicpartofEuropeFossilanisotropyTravel

5、-timeresidualsthanbeneathitsPrecambrianpartanddeepensdownto∼220kmbeneaththetwoAlpineroots,theSouthCarpathiansandeastwardoftheTrans-EuropeanSutureZone.SeparationoftherelativePresidualsintostaticanddirectional-dependentterms,shear-wavesplittinganalysisandjointinversionofaniso

6、tropicparameters,revealsthatthemantlelithosphereconsistsofdomainswithconsistentolivinefabrics,whichcanbemodelledbyperidotiteaggregateswithplungingfoliationorlineation.Changesofthefossilfabricallowustomapthedomainboundarieswithinthemantlelithosphere.Weproposeprocesseswhichco

7、uldcreatetheobservedfossilfabricasaconsequenceofsuccessivesubductionandaccretionofmicro-continentfragmentsoutboardofcontinentalcratonsandagradualstabilizationoftheLABbyamantleflowafteradetachmentofthelowerpartsofsubductingslabs.Weadvocatetheimportanceofcombiningdifferentmeth

8、odsanddatainEarthstructurestudiesandapplying3Dapproachesconsideringbothseismicanis