Holocene geo-ecological evolution of Lower Geyser Basin, Yellowstone National Park (USA)

Abstract Changes in climate and fire regime have long been recognized as drivers of the postglacial vegetation history Yellowstone National Park, but effects locally dramatic hydrothermal activity are poorly known. Multi-proxy records from Goose Lake used to describe Lower Geyser Basin where modern is widespread. From 10,300 cal yr BP 3800 BP, thermal waters discharged into lake, evidenced by deposition arsenic-rich sediment, fluorite mud, relatively high δ 13 C sediment values. Partially conditions affected limnobiotic composition, prevailing climate, regime, rhyolitic substrate maintained Pinus contorta forest basin, found throughout region. At water discharge ceased, a shift geochemistry limnobiota. Pollen charcoal data indicate concurrent grassland development with limited fuel biomass less activity, despite late Holocene that were conducive expanded cover. The at establishment treeless geyser basin may result tectonic event or change hydroclimate. This record illustrates complex interactions geology govern an active geo-ecosystem.