摘要
TheIrtyshshearzone(ISZ)ofAltairegionisthelineamentstructureofthecollision-suturetype,wheregranitesofKalbacomplexandgranodioritesofZmeinogorskcomplexareexposedtoregionalgneiss-formationandstress-metamorphicalterations.Thisstudyisbasedondetailedstructuralobservationsatspecialgroundsusingopticalandelectronmicroscopy,andonthebehavioranalysisofisotopicsystemsfromalteredgranitoids.WithintheISZareawehaveestablishedthecontinuousrowsofgranitoidstress-metamorphismfrominitialrecrystallizationofprotolite,itscataclasisandmechanicalflaringuptocompleterecrystallizationwithalterationofmineralcompositionandformationofthestreakycomplexesofgranitetectonitesofblastomyloniteandblastocataclasitetypes.Thedirectedalterationofrockshasseveralimpulseandisexpressedbyachangeinmorphologyofmineralgrainsandtheirrelations,magnificationofdeformationcomponentintherockstructure,andformationofnewmineralphasesonthebasisofinitialoneswithoutsurfacefluidization.Attransformationofisotopicsystemsfromgranitoid,theirfeldspars,biotiteandhornblende,wecanobserve'rejuvenation'oftherocksubstratefrom270-290MaforKalbagranitoidsto220-235Mafortheirtectonites,andforRudnyAltaigranodiorites,theirageschangesfrom285-317Mato232-257Mafortheirtectonites.
出版日期
2002年01月11日(中国期刊网平台首次上网日期,不代表论文的发表时间)