Pre-Miocene magmatism in the northern Rockies

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Presentation transcript:

Pre-Miocene magmatism in the northern Rockies Reed S. Lewis Idaho Geological Survey Arthur A. Bookstrom U.S. Geological Survey

1380 Ma A-type granites From: Zientek et al, U.S.G.S. OFR 2005-1235

1380 Ma granitic augen gneiss, Dworshak Reservoir

Ross and Villeneuve, 2003

From: Zientek et al, U.S.G.S. OFR 2005-1235 Brushy gulch- Green Mtn. fault ? From: Zientek et al, U.S.G.S. OFR 2005-1235

Neoproterozoic syenite and diorite

Taylor Ranch mylonite zone

“early phase” Idaho batholith

“main phase” Idaho batholith

Sodic and potassic rock suites Na-rich (high Sr/Y) K-rich (low Sr/Y)

Biotite granodiorite (Na-rich)

Hornblende-biotite granodiorite Hornblende-biotite granodiorite (K-rich)

sodic suite younger? (~85-65 Ma) deeper? “outboard” (or not yet exhumed in east?) higher Na, Al, Sr, Ba, and LREE Sr/Y > 40 initial 87Sr/86Sr ~ 0.707-0.710 relatively depleted and deeper(?) source

potassic suite older? (~100-85 Ma) “inboard” (or eroded away?) shallower? higher K, Rb, U, Mg Sr/Y < 40 initial 87Sr/86Sr ~ 0.707 relatively enriched, more mafic, and shallower(?) source

Eocene? Cretaceous Eocene?

Sr concentrations in granodiorites high Sr low Sr high Sr

questions What controlled the NW belts of Mesoproterozoic and Neoproterozoic intrusions? Rifts? Strike-slip faults? What were the magma sources? Can we deduce something about the different pC terranes? What can the K plutons tell us about “inboard” granite genesis? (any significance to chemical suites?) What can the T plutons tell us about extensional processes?

biggest need: geochron We badly need more SHRIMP/LA-ICPMS zircon dates (everywhere, but especially in the KT rocks)– problems with inheritance in past efforts Ar-Ar dates in selected areas (some areas covered well)

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