Paleoclimatic Inferences from a 120,000-Yr Calcite Record of Water-Table Fluctuation in Browns Room of Devils Hole, Nevada
| Autor: | Kenneth R. Ludwig, Alan C. Riggs, Barney J. Szabo, Peter T. Kolesar, Issac J. Winograd |
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| Rok vydání: | 1994 |
| Předmět: |
Calcite
010506 paleontology 010504 meteorology & atmospheric sciences Groundwater flow Water table Structural basin 01 natural sciences Petrography Paleontology chemistry.chemical_compound Arts and Humanities (miscellaneous) chemistry General Earth and Planetary Sciences Physical geography Groundwater Geology 0105 earth and related environmental sciences Earth-Surface Processes Chronology |
| Zdroj: | Quaternary Research. 41:59-69 |
| ISSN: | 1096-0287 0033-5894 |
| DOI: | 10.1006/qres.1994.1007 |
| Popis: | The petrographic and morphologic differences between calcite precipitated below, at, or above the present water table and uranium-series dating were used to reconstruct a chronology of water-table fluctuation for the past 120,000 yr in Browns Room, a subterranean air-filled chamber of Devils Hole fissure adjacent to the discharge area of the large Ash Meadows groundwater flow system in southern Nevada. The water table was more than 5 m above present level between about 116,000 and 53,000 yr ago, fluctuated between about +5 and +9 m during the period between about 44,000 and 20,000 yr ago, and declined rapidly from +9 to its present level during the past 20,000 yr. Because the Ash Meadows groundwater basin is greater than 12,000 km2 in extent, these documented water-table fluctuations are likely to be of regional significance. Although different in detail, water-level fluctuation recorded by Browns Room calcites generally correlate with other Great Basin proxy palcoclimatic data. |
| Databáze: | OpenAIRE |
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