Adirondack Geology - Faculty web pages

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$Math 361 Problem Set #5 Due 5 October 2012 - Faculty web pages$

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GeochronologyAfter McLelland (2002)U-Pb geochron indicates oldest igneous rocks exposed are~1350-1300 Ma tonalitic arc-related plutons intrusive into olderHighland paragneisses of uncertain ageOldest rocks in Lowlands are ~1200 Ma granodiorites intrusiveinto older paragneisses of uncertain age
GeochronologyMcLellandet al. (2002)In both Highlands and Lowlands, metapelitic migmatites >1200-1300 Ma contain anatectic material of ~1170 MaFollowing intrusion of granodiorites in Lowlands at 1207 Ma,leucocratic and tonalitic rocks were emplaced at ~1172 Ma andaccompanied by deformation and metamorphism associatedwith the latest, culminating phase of the Elzevirian orogeny,~1220-1160 Ma
Page 1 and 2: Adirondack GeologyIntroduction: Loc
Page 4 and 5: Topographically divided intothe Hig
Page 8 and 9: GeochronologyMcLellandet al. (2002)
Page 10 and 11: Ottawan orogeny - 1100-1050 Ma• a
Page 12 and 13: McLelland et al. (2002)• Extensio
Page 14 and 15: ProgradeOttawanmetamorphism1088-111
Page 17 and 18: Adirondackgeologichistory
Page 19 and 20: Tonalites-E-W belts in S AdksAMCG s
Page 21 and 22: Metagabbro - E andS AdksPlag - ande

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