Summary: 2004 Geological Society of America. For permission to copy, contact Copyright Permissions, GSA, or firstname.lastname@example.org.
Geology; November 2004; v. 32; no. 11; p. 957960; doi: 10.1130/G20797.1; 4 figures; 1 table. 957
Tropical response to the 8200 yr B.P. cold event? Speleothem
isotopes indicate a weakened early Holocene monsoon in
Matthew S. Lachniet* Department of Geoscience, MS-4010, University of Nevada, Las Vegas, Nevada 89154, USA
Yemane Asmerom Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, New Mexico 87131,
Stephen J. Burns Department of Geosciences, University of Massachusetts, Amherst, Massachusetts 01003-9297, USA
William P. Patterson Department of Geological Sciences, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5E2,
Victor J. Polyak Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, New Mexico 87131,
Geoffrey O. Seltzer Department of Earth Sciences, 204 Heroy Geology Laboratory, Syracuse University, Syracuse, New York
A 18O monsoon rainfall proxy record from a U-Thdated Costa Rican stalagmite
(88404920 yr B.P.) documents an early Holocene dry period correlative with the high-
latitude 8200 yr B.P. cold event. High 18O values between ca. 8300 and 8000 yr B.P.
demonstrate reduced rainfall and a weaker monsoon in Central America. A relatively