Microbiological and chemical characterization of hydrothermal fluids at Tortugas Mountain Geothermal Area, southern New Mexico, USA |
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Authors: | Dirk Schulze-Makuch John F Kennedy |
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Institution: | (1) University of Texas-El Paso, Department of Geological Sciences, El Paso, Texas 79968-0555, USA Fax: +1-915-747-5073 e-mail: dirksm@geo.utep.edu, US;(2) New Mexico Water Resources Research Institute, Box 30001, Las Cruces, New Mexico 88003-3167, USA, MX |
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Abstract: | The Tortugas Mountain Geothermal Area is part of the larger hydrothermal system of the Rio Grande Rift, southern New Mexico,
USA. Chemical and microbial parameters indicate that the sampled hydrothermal water derives from a mixture zone of deep, anaerobic
water with meteoric water from an adjacent alluvial, non-thermal groundwater flow system. A microbial phospholipid fatty acid
(PLFA) analysis indicates that biomass and diversity of hydrothermal groundwater are very low, whereas hydrothermal surface
water is diverse and bacteria are in a rapid growth phase. A nucleic acid (DNA) analysis of the hydrothermal groundwater resulted
in the identification of one eubacterium and two Archaea (archaebacteria); the eubacterium and one Archaea were previously
unknown. The one Archaea that could be related to a known species is an extreme halophilic methanomicrobacterium. The presence
of the halophilic Archaea and the other Archaea species supports the hypothesis of the Tortugas Mountain Geothermal Area being
the discharge area of deep circulating groundwater within a bedrock-hosted regional groundwater flow system.
Received, April 1999/Revised, January 2000/Accepted, February 2000 |
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Keywords: | microbiology thermal conditions hydrothermal fluids hydrochemistry USA |
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