Grotzinger。Jordan。Press。SieverUnderstandingEarthFifthEdition目_nc_腊pg锂-comMETAMORPHISMModificationofRocksbyTemperatureandPressureCopyright2007byW.HFreemanandCompany胺Chapter6|Metamorphism:ModificationofRocksbyTenlperatureandPressureAboutMetamorphism“Changesinheat,pressure,andthechemicalenvironmentofrockscanaltermineralcompositionsandcrystallinetextures,makingthemmetamorphic.作门帕陆温焦坂J李人招活堆的2稳洪办f意物趋内宗裂昴超辩的2常硒小标翩界fEal)Metamorphicchangesoccurinthesolidstate,sothereisnomelting.u吊腐)LectureOutline1.MetamorphismandtheEarthsystem(霾明余a孙圳孟视莘)2.Causesofmetamorphism(壬鲨亩霹邑唇亡妒_叫廿茱)3.Typesofmetamorphism(霭明余5的带环)4.Metamorphictextures(牙邑唁国)5.Regionalmetamorphismandmetamorphicgrade(助城性福斧宗糊斧令)6.Platetectonicsandmetamorphism(松场消酸学霖官霜明01工闻何)1.MetamorphismandtheEarthsystem(露野fea|室如二示签)伊drivenbyEarthsinternalheat帽囤刨堀惮I挡卞j啬嗪源曰斤弓懵)伟closelyreiatedtoplatetectonlics(霭野fE5|室束场道称学宾)伟releasesgasesintoatmosphere(善施氙佳刨一氙F)2.Causesofmetamorphism(牲胎嗣明二|的未)修internalheatofEarth(如驿F肚温基)伟intsrnalplessureofEarth仪伟fluidcompositioninsideEarth(浇偷史井)-掏野fEa|(Metasomatism)2.Causesofmetamorphism-theroleoftemperature(湘惧河糊颊feaJiI叮扯消的司5)Metamorphismmostlyoccursinthecrustalregionatdepthbetween1030km(招稚留fEa|取生关圭静|,涠惧一1030km)temperatureincreaseswithdepth(出矮温灯随涨灯增尔闯增小)rate=20?to60“Cperkm(丑公长增小搔一20恩珞60恩)东a15kmdepth:450?C(志浩基15五长阡温惧吊婉提一450成).geothermalgradient(在温栅惠)(犬拓出扣P部肚温成随涨圣猛人的根曾)倩shallow(20“Ckm)-(击温来惧小)惧steep(50“CJkm)-(地泗柯心一)口enconzessrcontrezoleJncanttuboucionnginsonondmonuinbdeantnenulthowpheeePressureincreaseswithdepthataboutthesamerateeverywhere.VolcanicarcZoneofcontinentalplateAncdentstablepressurefsubductionzone)extensionzn(ldiobar)Depth50km34。5团园EM吴E.buttemperatureInvolcanicarcstheinplateextension.andinstableincreasesatdifferent1300*Cisothermcrusbitisaboutratesindifferentregionsabout50kmdeep.。30kmdeepm150kmdeep.eeiponacoiocnmcoeeconowtnmeencaceneonlsotherm:Volcanicarc(subductionzone)Pressure(kilobars)Depth_李s巳?七巳二二二二二口coom上NCoov上N