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1 Department of Geological and Environmental Sciences, Stanford University, Stanford, California 94305-2115
2 Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48109-1063
The 
D values of amphibole and biotite in Tertiary plutons in central eastern Greenland decreased by 
30
between 55 and 50 Ma and then increased by 35 between 50 and 43 Ma. The D values of amphibole and biotite in in the plutons range from -160 to -123. These low values reflect isotopic exchange between the igneous rocks and hydrothermal fluids that were dominated by meteoric water. The changes in mineral D values between 55 and 43 Ma are explained most plausibly by shifts in the isotopic composition of meteoric waters that fed hydrothermal recharge areas. At 50 Ma, uplift related to the Iceland mantle plume elevated hydrothermal recharge areas by 1-2 km. High- altitude, low-D meteoric waters collected by the uplifted recharge areas caused the 30 decrease in mineral D values between 55 and 50 Ma. The subsequent increase in mineral D values from 50 to 43 Ma corresponds to widening of the North Atlantic Ocean and a change from continental to maritime climate. Thus Tertiary plutons in central eastern Greenland represent a network of paleoclimate stations that monitored the D of meteoric water during opening of the North Atlantic Ocean basin.
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