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Environmental change controls of lacustrine carbonate, Cayuga Lake, New York

Henry T. Mullins
Environmental change controls of lacustrine carbonate, Cayuga Lake, New York
Geology (Boulder) (May 1998) 26 (5): 443-446

Abstract

Dated sediment cores from Cayuga Lake, New York State, document that biologically mediated precipitation of calcite has been controlled by environmental change, both natural and anthropogenic, over the past 10000 yr. During the Holocene Hypsithermal ( approximately 9-4 ka [ (super 14) C]), Milankovitch forcing of summer insolation in the Northern Hemisphere resulted in a broad increase (to 55%), then decrease (to <5%), of calcite content in bottom sediment. Warmer summers resulted in earlier onset of thermal stratification of the water column, which increased the duration of primary production as well as the abundance of picoplankton, which in turn increased the amount of calcite precipitated. At the end of the Hypsithermal ca. 3500 yr ago, global cooling greatly reduced the amount of calcite precipitated. However, since A.D. 1940, calcite contents in Cayuga Lake sediments have risen up to approximately 20%. One hypothesis is that this recent increase in calcite is the result of cultural eutrophication (nutrient loading). However, this rise in calcite also closely tracks the anthropogenic rise of atmospheric carbon dioxide, suggesting a possible link to global environmental change. Further research on hard-water lake basins will be needed to test which of these two hypotheses is correct.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 26
Serial Issue: 5
Title: Environmental change controls of lacustrine carbonate, Cayuga Lake, New York
Author(s): Mullins, Henry T.
Affiliation: Syracuse University, Department of Earth Sciences, Syracuse, NY, United States
Pages: 443-446
Published: 199805
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 23
Accession Number: 1998-033584
Categories: Quaternary geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, sketch map
N42°25'60" - N42°55'00", W76°47'60" - W76°28'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 199813
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