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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Primary terms
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siliceous sinter
Surface expression of Late Caledonian magmatic lithium concentration, in the Rhynie Chert, UK
Epithermal Zeolite Alteration Associated with Siliceous Sinters, Hydrothermal Eruption Breccias, and Gold-Silver Mineralization, Central Taupo Volcanic Zone, New Zealand
Episodic fluid flow in an active fault
Life is everywhere in sinters: examples from Jurassic hot-spring environments of Argentine Patagonia
Environmental controls on silica sinter formation revealed by radiocarbon dating
Discovery, Geology, and Origin of the Fruta del Norte Epithermal Gold-Silver Deposit, Southeastern Ecuador
Geologic record of partial ocean evaporation triggered by giant asteroid impacts, 3.29–3.23 billion years ago
Natural hydrous amorphous silica: Quantitation of network speciation and hydroxyl content by 29 Si MAS NMR and vibrational spectroscopy
Unusual mixed silica–carbonate deposits from magmatic–hydrothermal hot springs, Savo, Solomon Islands
Impact of Seasonal Changes on the Formation and Accumulation of Soft Siliceous Sediments on the Discharge Apron of Geysir, Iceland
Jurassic geothermal landscapes and fossil ecosystems at San Agustín, Patagonia, Argentina
Jurassic hot-spring activity in a fluvial setting at La Marciana, Patagonia, Argentina
Abstract Hot springs, geysers, mud pots, and fumaroles are dynamic surface features that represent interacting subterranean systems of water, heat, and rocks. Identifying the locations of these features and monitoring their heat, water flow, and chemistry can provide land managers with data needed to make informed decisions about management options. This chapter describes vital signs and contains options for monitoring surface and near-surface geothermal features, such as hot springs, geysers, mud pots, and fumaroles. Its focus is the description of techniques for detecting change in hydrothermal systems through time due to natural or human-related causes. The goal of this chapter is to describe selected techniques for monitoring important vital signs of geothermal systems. Information in this chapter will not make the reader an expert in all geological aspects of geothermal systems. Some monitoring techniques are simple and can be performed by interested volunteers with no specialized background. Other techniques are complex and are best done by experts, with study results interpreted by seasoned practitioners. The described monitoring options may not meet all statutory and regulatory requirements that land managers may face. The terms geothermal and hydrothermal have specific connotations as used in this chapter ( Jackson, 1997 ). Geothermal refers to any system that transfers heat from within the Earth to its surface. Hot rocks, without water, are geothermal. Hydrothermal is a subset of geothermal, and means that the transfer of heat involves water, either in liquid or vapor state (hence the “hydro”). Hot springs and geysers, for example, are hydrothermal