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层状岩体中的岩浆不混熔作用：来自显微结构和矿物成分的记录.docx

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层状岩体中的岩浆不混熔作用：来自显微结构和矿物成分的记录 Title:RecordsofMagmaticNon-mixingProcessesinLayeredRockMasses:InsightsfromMicrostructureandMineralComposition Abstract: Layeredrockmassesarecommonlyfoundinigneousintrusionswheremagmaticprocessesoccur.Understandingthemechanismsofmagmaticnon-mixingiscrucialfordecipheringthecomplexformationhistoryoftheserocks.Thispaperfocusesontherecordsofmagmaticnon-mixingprocessesinlayeredrockmasses,basedontheexaminationofmicrostructuresandmineralcompositions.Byanalyzingvariouscasestudies,wepresentacomprehensiveunderstandingofthefactorsinfluencingmagmaticnon-mixing,includingcrystalsettling,magmainjections,andchemicalvariationsinthemelt.Theseprocessescanhelpconstraintheemplacementdynamicsoflayeredrockmassesandaidinourinterpretationofthepetrogenesisoftheserocks. 1.Introduction: Layeredrockmassesareformedwhenmagmaintrudesintopre-existingrockunitsandundergoesvariousmagmaticprocesses.Theserocksarecharacterizedbydistinctlayering,withdifferentmineralcompositionsandtexturesobservedwithinindividuallayers.Previousstudieshaverecognizedthatmagmaticnon-mixingprocessesplayacrucialroleinthedevelopmentoftheselayers.Byexaminingthemicrostructuresandmineralcompositionspreservedwithintheserocks,wecangaininsightsintotheprocessesthatoperatedduringtheirformation. 2.CrystalSettlingandFractionalCrystallization: Crystalsettlingisacommonmechanismthatcontributestotheformationoflayeringinmagmaticsystems.Inlayeredintrusions,densercrystalssettletowardsthebottom,resultingintheformationofcumulatelayers.Thedegreeofcrystalsettlingdependsonthedensity,size,andshapeofthecrystals,aswellastheviscosityofthemagma.Byanalyzingthetexturesandmineralassemblageswithintheselayers,wecangleaninformationaboutthenatureofthesettlingprocess.Additionally,fractionalcrystallizationmayoccurduringthecoolingofmagma,resultingintheseparationofcrystalswithdifferentcompositionsanddensities.Thisprocesscanfurthercontributetothedevelopmentoflayeringwithintherockmass. 3.MagmaInjectionsandInterlayerMelt: Theinjectionofnewpu