Magnetotelluric studies of the Caldas Novas geothermal reservoir, Brazil

Lugăo, Patricia Pastana de; Terra, Emanuele F. La; Kriegshäuser, Berthold; Fontes, Sergio L.

doi:10.1016/s0926-9851(01)00097-0

Cited by 17 publications

(7 citation statements)

References 11 publications

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“…This area is formed by 86 springs and the surface water temperature is around 60 °C. This area has been studied by only a few geochemical and geophysical methods, so the exact cause for the presence of thermal waters in Caldas Novas is still unknown (Lugão et al 2002). The microbial community of these Brazilian hot springs was explored for fungi with biotechnological applications (Rezende et al 2005).…”

Section: Extreme Environments In Brazilmentioning

confidence: 99%

Brazilian research on extremophiles in the context of astrobiology

Duarte

Nóbrega

Nakayama

et al. 2012

International Journal of Astrobiology

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AbstractExtremophiles are organisms adapted to grow at extreme ranges of environmental variables, such as high or low temperatures, acid or alkaline medium, high salt concentration, high pressures and so forth. Most extremophiles are micro-organisms that belong to the Archaea and Bacteria domains, and are widely spread across the world, which include the polar regions, volcanoes, deserts, deep oceanic sediments, hydrothermal vents, hypersaline lakes, acid and alkaline water bodies, and other extreme environments considered hostile to human life. Despite the tropical climate, Brazil has a wide range of ecosystems which include some permanent or seasonally extreme environments. For example, the Cerrado is a biome with very low soil pH with high Al+3concentration, the mangroves in the Brazilian coast are anaerobic and saline, Pantanal has thousands of alkaline–saline lakes, the Caatinga arid and hot soils and the deep sea sediments in the Brazilian ocean shelf. These environments harbour extremophilic organisms that, coupled with the high natural biodiversity in Brazil, could be explored for different purposes. However, only a few projects in Brazil intended to study the extremophiles. In the frame of astrobiology, for example, these organisms could provide important models for defining the limits of life and hypothesize about life outside Earth. Brazilian microbiologists have, however, studied the extremophilic micro-organisms inhabiting non-Brazilian environments, such as the Antarctic continent. The experience and previous results obtained from the Brazilian Antarctic Program (PROANTAR) provide important results that are directly related to astrobiology. This article is a brief synopsis of the Brazilian experience in researching extremophiles, indicating the most important results related to astrobiology and some future perspectives in this area.

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Section: Extreme Environments In Brazilmentioning

confidence: 99%

Brazilian research on extremophiles in the context of astrobiology

Duarte

Nóbrega

Nakayama

et al. 2012

International Journal of Astrobiology

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“…It leads to an increase in rock permeability, which, in turn, provides favorable conditions for hydrothermal fluid circulation. The latter is often detected along faults, thus EM sounding of faulted zones may help to guide the location of geothermal reservoirs (e.g., Ushijima et al, 1986;Galanopoulus et al, 1991;Bromley, 1993;Bibby et al, 1995;Correia and Jones, 1997;Wannamaker, 1997a,b;Lagios et al, 1998;Romo et al, 2000;De Lugao et al, 2002;Wannamaker et al, 2002;Del Rosario et al, 2005;Layugan et al, 2005;Manzella et al, 2006). Romo et al (2000) used MT measurements at 90 sites to estimate the subsurface distribution of the electric conductivity at a depth range from 0 to 3 km.…”

Section: Tectonics Faulting and Fracturingmentioning

confidence: 99%

Electromagnetic sounding of geothermal zones

Spichak

Manzella

2009

Journal of Applied Geophysics

140

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“…The main disadvantages of these methods are the shallow penetration depths and their interpretation being mostly based on 1-D algorithms (Nabighian and Asten, 2002). However, magnetotelluric (MT) and audiomagnetotelluric (AMT) methods are routinely used for deep investigation in geothermal studies (Arango et al, 2009;Lugão et al, 2002), groundwater exploration (Chandrasekhar et al, 2009;Meju et al, 1999), petroleum exploration (Menezes and Travassos, 2010) and tectonic studies (Menezes and Travassos, 2005). In mining exploration, MT and AMT have a more restricted use, with only a few applications (Farquharson and Craven, 2009).…”

Section: Introductionmentioning

confidence: 99%