Publikationsdatum:
2015-08-09
Beschreibung:
Publication date: Available online 8 August 2015 Source: Quaternary Research Author(s): Matthew E. Kirby, Edward J. Knell, William T. Anderson, Matthew S. lachniet, Jennifer Palermo, Holly Eeg, Ricardo Lucero, Rosa Murrieta, Andrea Arevalo, Emily Silveira, Christine A. Hiner Silver Lake is the modern terminal playa of the Mojave River in southern California (USA). As a result, it is well located to record both influences from the winter precipitation dominated San Bernardino Mountains – the source of the Mojave River – and from the late summer to early fall North American monsoon at Silver Lake. Here, we present various physical, chemical and biological data from a new radiocarbon-dated, 8.2 m sediment core taken from Silver Lake that spans modern through 14.8 cal ka BP. Texturally, the core varies between sandy clay, clayey sand, and sand-silt-clay, often with abrupt sedimentological transitions. These grain-size changes are used to divide the core into six lake status intervals over the past 14.8 cal ka BP. Notable intervals include a dry Younger Dryas chronozone, a wet early Holocene terminating 7.8 – 7.4 cal ka BP, a distinct mid-Holocene arid interval, and a late Holocene return to ephemeral lake conditions. A comparison to potential climatic forcings implicates a combination of changing summer – winter insolation and tropical and N Pacific sea-surface temperature dynamics as the primary drivers of Holocene climate in the central Mojave Desert.
Print ISSN:
0033-5894
Digitale ISSN:
1096-0287
Thema:
Geographie
,
Geologie und Paläontologie
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