A lacustrine carbonate record of Holocene seasonality and climate
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Abstract
Annually laminated (varved) Holocene sediments from Derby Lake, Michigan, display variations in endogenic calcite abundance reflecting a long-term (millennial-scale) decrease in burial punctuated with frequent short-term (decadal-scale) oscillations due to carbonate dissolution. Since 6000 cal yr B.P., sediment carbonate abundance has followed a decreasing trend while organic-carbon abundance has increased. The correlation between organic-carbon abundance and the sum of March-April-October-November insolation has an r2 value of 0.58. We interpret these trends to represent a precession-driven lengthening of the Holocene growing season that has reduced calcite burial by enhancing net annual organic-matter production and associated calcite dissolution. Correlations with regional paleoclimate records suggest that changes in temperature and moisture balance have impacted the distribution of short-term oscillations in carbonate and organic-matter abundance superimposed on the precession-driven trends.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | A lacustrine carbonate record of Holocene seasonality and climate |
| Series title | Geology |
| DOI | 10.1130/G30056A.1 |
| Volume | 37 |
| Issue | 8 |
| Year Published | 2009 |
| Language | English |
| Publisher | Geological Society of America |
| Contributing office(s) | Geology and Environmental Change Science Center |
| Description | 4 p. |
| First page | 695 |
| Last page | 698 |
| Country | United States |
| State | Michigan |
| Other Geospatial | Derby Lake |
| Google Analytic Metrics | Metrics page |