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1.How do igneous rocks differ fromone another ?2.How do magmas form ?Lecture 5: Igneous Rocks:SolidsFromMelts
6.Igneous rocks in the western US
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Chapter 20 / Exercise 75
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Last timeRock cycleLocal geology and geological historyLogistics:Labs this week.Ask questions anytimeFirst midterm Oct 6– stay tuned for detailsComing up: weathering sedimentary and rocks,metamorphic rocks, volcanismMAKE SURE YOU SIGN UP FOR A FIELD TRIP
Why?1.Understand processes that form crust (differentiate Earth)2.Decipher compositional and thermal history of Earth3.Assess volcanic hazard4.Geothermal and mineral resourcesRemember . . . Rocks are the history books of Earth
Elemental associationsPeriodic properties of the elements explain many geochemical patterns.For example:1.Earth is a “differentiated body” with a core, mantle and crust that arechemically distinct. Why?2.Why are K, Ca and Sr are concentrated in the crust and not in the core?3.Why is Copper almost always found in sulfide ores rather than inoxides?In early 1900s, Victor Goldschmidt proposed a practical scheme for groupingelements according to their occurrence in nature.He found that most elements have greater affinity for one of three kinds ofminerals:silicates,sulfides, andmetals
IIIIIIIVVVIVIIVIII12HHe34567810LiBeBCNONe11121314151618NaMgAlSiPSAr1920212223242526272829303132333436KCaScTiVCrMnFeCoNiCuZnGaGeAsSeKr3738394041424344454647484950515254RbSrYZrNbMo(Tc)RuRhPdAgCdInSnSbTeXe555657727374757677787980818283848586CsBaLa*HfTaWReOsIrPtAuHgTlPbBiPoAtRn878889FrRa Ac**575859606162636465666768697071*LanthanidesLaCePrNd(Pm) SmEuGdTbDyHoErTmYbLu899091929394**ActinidesAcThPaUNpPuOsSiderophileCuChalcophileNAtmophileThe Periodic Table of the Elements:Lithophile= elements that readily form compounds with oxygen; elements concentrated in earth’scrust; silicates, oxides and other “stony” minerals(Na, K, Si, Al, Ti, Mg, Ca)Chalcophile= elements that most easily form sulfides; chalcos = copperSiderophile= elements that form metallic alloys rather than stoichiometric compounds; sideros =iron; weak affinity for oxygen and sulfurAtmophile= elements commonly found as gasesàGeneral geochemical behavior
IIIIIIIVVVIVIIVIII12HHe345678910LiBeBCNOFNe1112131415161718NaMgAlSiPSClAr192021222324252627282930313233343536KCaScTiVCrMnFeCoNiCuZnGaGeAsSeBrKr3738394041424445464748495051525354RbSrYZrNbMoRuRhPdAgCdInSnSbTeIXe555657727374757677787980818283848586CsBaLa*HfTaWReOsIrPtAuHgTlPbBiPoAtRn878889FrRa Ac**575859606162636465666768697071*LanthanidesLaCePrNd(Pm) SmEuGdTbDyHoErTmYbLu899091929394**ActinidesAcThPaUNpPuOsSiderophileRbLithophileNAtmophileThe Periodic Table of the Elements:Lithophile= elements that readily form compounds with oxygen; elements concentrated in earth’s

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Term
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Igneous rocks, Metamorphoses,
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The document you are viewing contains questions related to this textbook.
Chemistry
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Chapter 20 / Exercise 75
Chemistry
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