Responses of sediment geochemistry to climate change in Owens Lake sediment: An 800-k.y. record of saline/fresh cycles in core OL-92
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- Larger Work: An 800,000-year paleoclimatic record from core OL-92, Owens Lake, Southeast California
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Abstract
Geochemical parameters of sediments from drill hole OL-92 indicate that Owens Lake was saline, alkaline, and highly productive during interglacial periods, and was hydrologically open and relatively unproductive during glacial periods. Abundance of CaCO3, organic carbon, and cation-exchange capacity of the clay fraction show cyclic variation down the core. Six minima in these components during the past 500 k.y. are interpreted as caused by intensive overflow that occurred during Sierran glacial advances. Maxima in these components indicate closed-lake conditions, reflecting warmer and more arid interglacial climates. The pattern of CaCO3 abundance suggests that closed lake conditions predominated over the past 500 k.y. The absence of gaylussite and gypsum in the sediments, however, indicates lake salinity never exceeded about 15 wt %, a limit which requires flushing of accumulated salts every 10 k.y.
Oscillations of CaCO3 generally indicate a 100-k.y. dominant cycle, a characteristic of the marine δ18O record. Four of the last five marine isotope terminations are clearly shown in the Owens Lake record. The last interglacial at Owens Lake appears to have occurred between 120 ka and 50 ka. The roughly 10-k.y. offset between this interval and marine oxygen-isotope stage 5 reflects either error in the age-depth model, or alternatively, a time lag between changes in Northern Hemisphere ice volumes and the manifestation of local climate change in lake geochemistry and sedimentology.
Study Area
| Publication type | Book chapter |
|---|---|
| Publication Subtype | Book Chapter |
| Title | Responses of sediment geochemistry to climate change in Owens Lake sediment: An 800-k.y. record of saline/fresh cycles in core OL-92 |
| DOI | 10.1130/0-8137-2317-5.37 |
| Volume | 317 |
| Year Published | 1997 |
| Language | English |
| Publisher | Geological Society of America |
| Description | 11 p. |
| Larger Work Type | Book |
| Larger Work Subtype | Monograph |
| Larger Work Title | An 800,000-year paleoclimatic record from core OL-92, Owens Lake, Southeast California |
| First page | 37 |
| Last page | 47 |
| Country | United States |
| State | California |
| Other Geospatial | Owens Lake |
| Google Analytic Metrics | Metrics page |