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Geology; January 2000; v. 28; no. 1; p. 35-38; DOI: 10.1130/0091-7613(2000)28<35:IEFLQC>2.0.CO;2
© 2000 Geological Society of America
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Isotopic evidence for late Quaternary climatic change in tropical South America

Geoffrey Seltzer1, Donald Rodbell2 and Stephen Burns3

1 Department of Earth Sciences, Syracuse University, Syracuse, New York 13244, USA
2 Department of Geology, Union College, Schenectady, New York 12308, USA
3 Department of Geology, University of Bern, Switzerland

The tropical hydrologic cycle affects atmospheric trace gases and global climate change, and thus records of hydrologic change encompassing a variety of time scales from the low latitudes are important in paleoclimatology. Isotopic analysis of calcite from Lake Junin, Peru, provides a record of hydrologic variability that spans the last glacial-interglacial transition in the southern tropics. The record reveals a 6{per thousand} enrichment in {delta}18Ocalcite during the late glacial followed by a gradual depletion during the Holocene, which can be interpreted as a decrease followed by a long-term increase in effective moisture. Close agreement between {delta}18Ocalcite and rainy season insolation indicates that long-term changes in tropical hydrology were linked to orbital variations. Furthermore, hydrologic change was out of phase in the northern and southern tropics over this time period.

Key Words: stable isotopes • lakes • Andes • climate change • carbonates • insolation




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