Obliteration of thermal springs by groundwater flows in sedimentary basins of Brazil

Vieira, None Fábio; Hamza, Valiya M.; Alexandrino, Carlos Henrique

doi:10.1007/s10040-013-1081-1

Cited by 8 publications

(5 citation statements)

References 36 publications

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“…Such conditions are also believed to favor the widespread occurrence of thermal springs. Results of recent geothermal studies (Vieira e Hamza, 2012;Vieira et al, 2014;Vieira, 2015) confirmed the potential for occurrence of geothermal resources in the area.…”

Section: Introductionmentioning

confidence: 73%

Regions of anomalous geothermal fields in the State of Tocantins, Central Brazil

Descovi

Vieira

2019

ijthfa

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We report recent progress in determination of geothermal gradients and heat flow in the State of Tocantins, Central Brazil. This region lying between the Amazonas and Sao Francisco cratons has been affected by metamorphic folding events (Brasilia and Araguaia) during Proterozoic times. This area is also characterized by moderate micro-seismic seismic activity. Results of recent investigations have revealed the presence of several areas where geothermal gradients and heat flow have values higher than normal, which is considered atypical of stable tectonic settings. In southern parts of the State of Tocantins heat flow values are higher than 80 mW/m2. Extrapolations based on near surface heat flow data point to crustal temperatures in excess of 200°C at depths less than 5 km. However, there are no evidences of magmatic intrusions at shallow intra-crustal depths. In the absence of other geologic source mechanisms and tectonic events the process responsible for high heat flow has been postulated to be enhanced heat transport by carbonic gas flow in the upper crust. This possible alternative is supported by observations of carbonic gas flow at sites of thermal springs within the study area and also in geothermal areas in the neighboring state of Goiás. Model simulations of deep crustal geotherms indicate that temperatures may approach levels of partial fusion at the crust mantle boundary.

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Section: Introductionmentioning

confidence: 73%

Regions of anomalous geothermal fields in the State of Tocantins, Central Brazil

Descovi

Vieira

2019

ijthfa

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“…Results of numerical simulations reported in the work of Vieira et al (2013) may be adapted for understanding nature of temperature variations along such flow paths. The results of numerical simulations considered by Vieira et al (2013) indicates that the magnitude of temperature variations along the horizontal flow path is significantly larger than that in the recharge zone. As expected sharp temperature drops occur along the discharge zone On the other hand, velocities of horizontal fluid movement are likely to be lower, a natural consequence of wider flow paths, larger permeability.…”

Section: Spatial and Temporal Variationsmentioning

confidence: 98%

Paleo heat flow in areas of Sedimentary Exhalative (SEDEX) deposits of Eastern Brazil

Iyer

Hamza

2019

ijthfa

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Representative values of fluid inclusion temperatures and radiogenic heat production values have been compiled as part of an attempt to determine paleo heat flow in areas sedimentary exhalative (SEDEX) deposits in thirteen localities of eastern Brazil. The results obtained indicate heat flow in excess of 80 mW/m2in areas of mineral bearing sulphide ore deposits, during periods of ore forming processes. Such anomalously high heat flow are more than twice the present-day values for stable tectonic units of Precambrian age. There are indications that high heat flow values were sustained by circulation of hydrothermal fluids in the upper crust, during periods not exceeding a few hundred million years. The resulting geothermal episodes may be considered as constituting short-period “heat pulses” occurring in stable tectonic environments, generated by magma emplacements in the upper crust, leading to formation of areas of sulfide ore deposits. Model simulations indicate that subsidence episodes induced by stretching and magma under-plating constitute the mechanisms for high heat flow during the ore-forming processes.

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“…Simple models may be used to estimate the effective ranges of flow velocities to produce hot springs in flow systems with different geometries (e.g., Morgan et al, 1981). Vieira et al (2014) proposed a useful, simple model that can be adapted to investigate heat exchange in geologic structures with non-circular geometry. However, this model requires sets of temperature gradients and Péclet numbers, rather than data that may be collected at the spring discharge, as with the semi-circular aquifer model.…”

Section: Semicircular Aquifer Modelmentioning

confidence: 99%

A simple model of gravitationally-driven water flow in a semicircular aquifer to estimate geothermal power potential: Examples from Arizona and Colorado

Morgan

2016

Geothermics

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Obliteration of thermal springs by groundwater flows in sedimentary basins of Brazil

Cited by 8 publications

References 36 publications

Regions of anomalous geothermal fields in the State of Tocantins, Central Brazil

Regions of anomalous geothermal fields in the State of Tocantins, Central Brazil

Paleo heat flow in areas of Sedimentary Exhalative (SEDEX) deposits of Eastern Brazil

A simple model of gravitationally-driven water flow in a semicircular aquifer to estimate geothermal power potential: Examples from Arizona and Colorado

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