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Chapter 4 Calcareous Spring Deposits in Continental Settings
Abstract Spring systems encompass a tremendous range of environmental niches where calcareous deposits commonly form. Although active springs have been classified according to their water temperatureExpand
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Palaeolimnology and archaeology of Holocene deposits north-east of Lake Turkana, Kenya
Geological, diatom, pollen and archaeological studies, supported by 24 original radiocarbon dates, provide new evidence to illustrate the Holocene history of Lake Turkana, Kenya. High andExpand
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Biogenicity of gold- and silver-bearing siliceous sinters forming in hot (75°C) anaerobic spring-waters of Champagne Pool, Waiotapu, North Island, New Zealand
Champagne Pool, a large hot spring at Waiotapu in North Island, New Zealand, is rimmed by a subaerial sinter dam and a shallow subaqueous shelf that is composed of orange sinter rich in metallicExpand
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Hot spring sinters: keys to understanding Earth's earliest life forms
The question of what composed the Earth's oldest fossils is the subject of current debate. At present, taphonomical determination of Archean silicified microfossils is largely based on morphologicalExpand
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Microbial Biofacies in Hot-Spring Sinters: A Model Based on Ohaaki Pool, North Island, New Zealand
ABSTRACT Ohaaki Pool was the main hot spring in the Broadlands-Ohaaki geothermal area before recent anthropogenic modification. The alkaline Na-HCO3-Cl water, which discharged at 95°C with a flowExpand
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Reflectance Spectra Diversity of Silica-Rich Materials: Sensitivity to Environment and Implications for Detections on Mars
Hydrated silica-rich materials have recently been discovered on the surface of Mars by the Mars Exploration Rover (MER) Spirit, the Mars Reconnaissance Orbiter (MRO) Compact Reconnaissance ImagingExpand
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The Microbial Role in Hot Spring Silicification
Abstract Recent experimental studies indicate that microorganisms play a passive role in silicification. The organic functional groups that comprise the outer cell surfaces simply serve asExpand
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Biogenicity of Silica Precipitation Around Geysers and Hot-Spring Vents, North Island, New Zealand
ABSTRACT Before anthropogenic modifications, Ohaaki Pool (Broadlands-Ohaaki) and Dragon's Mouth Geyser (Wairakei) emitted waters at temperatures of 93-98°C. The siliceous sinter that precipitatedExpand
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Geothermal diatoms: a comparative study of floras in hot spring systems of Iceland, New Zealand, and Kenya
Diatom floras were examined from geothermal environments in three contrasting tectonic settings. These included subduction-related acid and alkaline springs in New Zealand; alkaline springs along aExpand
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Sedimentation and recent history of a freshwater wetland in a semi‐arid environment: Loboi Swamp, Kenya, East Africa
Loboi Swamp is a 1AE 5k m 2 freshwater wetland situated near the equator in the Kenya Rift Valley. The climate is semi-arid: precipitation is � 700 mm year )1 , and evapotranspiration is � 2500 mmExpand
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