Quick
Search: 
 
advanced search
 GSW Home    GeoRef Home    My GSW Alerts    Contact GSW    About GSW    Journals List    Help 
Geology Signup for GSW Email News
JOURNAL HOME HELP CONTACT PUBLISHER SUBSCRIBE ARCHIVE SEARCH TABLE OF CONTENTS

Geology; September 1994; v. 22; no. 9; p. 775-778
This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Nevle, R. J.
Right arrow Articles by O'Neil, J. R.
Right arrow Search for Related Content
GeoRef
Right arrow GeoRef Citation

Tertiary plutons monitor climate change in East Greenland

Richard J. Nevle, Mark E. Brandriss, Dennis K. Bird, Michael O. McWilliams, and James R. O'Neil

Stanford University, Department of Geological and Environmental Sciences, Stanford, CA, United States

The delta D values of amphibole and biotite in Tertiary plutons in central eastern Greenland decreased by approximately 30per mil between 55 and 50 Ma and then increased by approximately 35per mil between 50 and 43 Ma. The delta D values of amphibole and biotite in the plutons range from -160per mil to -123per mil. These low values reflect isotopic exchange between the igneous rocks and hydrothermal fluids that were dominated by meteoric water. The changes in mineral delta 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-delta D meteoric waters collected by the uplifted recharge areas caused the approximately 30per mil decrease in mineral delta D values between 55 and 50 Ma. The subsequent increase in mineral delta 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 delta D of meteoric water during opening of the North Atlantic Ocean basin.

This record provided courtesy of AGI/GeoRef.




This article has been cited by other articles:


Home page
Economic GeologyHome page
C. K. Brooks, C. Tegner, H. Stein, and B. Thomassen
Re-Os AND 40Ar/39Ar AGES OF PORPHYRY MOLYBDENUM DEPOSITS IN THE EAST GREENLAND VOLCANIC-RIFTED MARGIN
Economic Geology, September 1, 2004; 99(6): 1215 - 1222.
[Abstract] [Full Text] [PDF]


Home page
GeologyHome page
Fossil hydrothermal systems tracking Eocene climate change in Antarctica
Geology, October 1, 2001; 29(10): 931 - 934.



Home page
Journal of the Geological SocietyHome page
L. E. Heister, L. E. HEISTER, P. A. O'DAY, C. K. BROOKS, P. S. NEUHOFF, and D. K. BIRD
Pyroclastic deposits within the East Greenland Tertiary flood basalts
Journal of the Geological Society, March 1, 2001; 158(2): 269 - 284.
[Abstract] [Full Text] [PDF]


Home page
Economic GeologyHome page
J. G. Arnason, J. G. Arnason, and D. K. Bird
A Gold- and Platinum-Mineralized Layer in Gabbros of The Kap Edvard Holm Complex: Field, Petrologic, and Geochemical Relations
Economic Geology, August 1, 2000; 95(5): 945 - 970.
[Abstract] [Full Text] [PDF]




JOURNAL HOME HELP CONTACT PUBLISHER SUBSCRIBE ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 2008 by Geological Society of America