The fractal shape of sutured quartz grain boundaries: application as a geothermometer

Kruhl, Jörn H.; Nega, M.

doi:10.1007/s005310050049

Cited by 62 publications

(36 citation statements)

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“…The D value of the sutured quartz grain boundaries was found to be 1.21±0.02 (15 cases) in the orthogneiss mylonite samples, while in the graphitic gneiss mylonite samples D=1.23±0.05 (5 cases) is typical. Using the calibration scheme of Kruhl and Nega (1996) deformation temperatures of T def~ 470 °C can be estimated for the orthogneiss mylonite and T def~ 440 °C for graphitic gneiss mylonite, respectively (Fig. 5).…”

Section: Results Of Sutured Quartz Grains Geothermometrymentioning

confidence: 99%

“…On the calibrated geothermometer a linear function is suggested between the fractal dimension of the sutured quartz grain boundaries and the formation temperature. Kruhl and Nega (1996) also suggest that the result of the thermometer does not depend on the strain rate. This textural thermometer was refined by Takahashi et al (1998) using artificial samples.…”

Section: Sutured Quartz Grains As a Deformation-related Thermometermentioning

confidence: 89%

“…In numerous naturally deformed rocks Masuda and Fujimura (1981) and Hirth and Tullis (1992) studied the relationship between temperature, strain rate and the grain-boundary geometry, and found that the length of the suture segment increases with decreasing temperature. Kruhl and Nega (1996) established on natural samples derived from different metamorphic grades (low-greenschist to mediumgranulite facies) that the sutured quartz grain boundaries are statistically selfsimilar and so can be represented as fractal-like objects. On the calibrated geothermometer a linear function is suggested between the fractal dimension of the sutured quartz grain boundaries and the formation temperature.…”

Section: Sutured Quartz Grains As a Deformation-related Thermometermentioning

confidence: 99%

“…The sutured grain boundaries were digitized manually. The fractal dimension values (D) were obtained by Benoit 1.0 fractal geometry software using the divider method (Mandelbrot 1967) following the suggestions of Kruhl and Nega (1996). The slope of the regression line fitted onto the middle section of the log-log transformed Lr diagram defines D for each individual suture.…”

Section: Sutured Quartz Grains As a Deformation-related Thermometermentioning

confidence: 99%

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Petrology and tectonic evolution of the Kiskunhalas-NE fractured hydrocarbon reservoir, South Hungary

Nagy¹,

Tóth²

2012

Central European Geology

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The Kiskunhalas-NE (KIHA-NE) fractured hydrocarbon reservoir is part of the structurally rather complex crystalline basement of the Great Hungarian Plain. In the course of petrologic and thermometric examinations various rock types of the investigated area have been classified and characterized. There are four basic lithological units in the area. In the lowest structural position orthogneiss is common, which according to its petrographic features is assumed to be identical to the orthogneiss body of the adjacent Jánoshalma (JH) basement high (metamorphic peak temperature T < 580 °C according to Zachar and M. Tóth 2004). The next rock unit upward is the highly mylonitized variety of the orthogneiss with textural features suggesting deformation in an extensional stress regime. In the higher section of the mylonite zone graphitic gneiss mylonite is characteristic, with a peak metamorphic T of 410±45 °C. The lithology in the shallowest position of the area is a graphitic carbonate phyllite, with a T of 375 ± 15 °C. Estimation of the deformation temperature for both mylonitic rocks results in approximately T def~ 455 °C. All data together suggest that between the top (graphitic carbonate phyllite) and the bottom (orthogneiss) of the ideal rock column there is about 200°C peak metamorphic temperature deviation. The two extreme metamorphic blocks probably became juxtaposed along an extensional fault zone in the basement at approximately 15 km depth.

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Section: Results Of Sutured Quartz Grains Geothermometrymentioning

confidence: 99%

Section: Sutured Quartz Grains As a Deformation-related Thermometermentioning

confidence: 89%

Section: Sutured Quartz Grains As a Deformation-related Thermometermentioning

confidence: 99%

Section: Sutured Quartz Grains As a Deformation-related Thermometermentioning

confidence: 99%

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Petrology and tectonic evolution of the Kiskunhalas-NE fractured hydrocarbon reservoir, South Hungary

Nagy¹,

Tóth²

2012

Central European Geology

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Section: Sutured Quartz Grains As a Deformation-related Thermometermentioning

confidence: 99%

Complex evaluation of the Kiskunhalas-NE fractured metamorphic hydrocarbon reservoir

Fiser-Nagy¹

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Processes of silicate karstification associated with pan formation in the Darwin–Koolpinya area of northern Australia

Borger

McFarlane²,

Ringrose³

2004

Earth Surf Processes Landf

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Lyons Lagoon, one of many small pans near Darwin, Northern Australia, occurs in lateritized terrain. Formation by structurally facilitated silicate karstification of the parent Cretaceous sandy sediments was earlier proposed. This paper presents the results of thin section microscopy and scanning electron microscopy with energydispersive X-ray study of pan sediments with a view to assessing the extent to which they reflect the geomorphological/hydrogeological history. Severe corrosion was found to overprint the impact features of the primary sands, attributed to aggressive leaching and consistent with formation of the depression by karstification when the water table was low. Formation of a smectitic matrix is considered to have followed when the water table was high. Upon subsequent lowering of the water level leaching was resumed, altering smectite to kaolinite and resulting in incongruent dissolution of kaolinite to leave a siliceous residuum. At least two cycles of high followed by low water levels are recognized. Such periodic changes of levels are considered essential to pan formation within freely draining lateritic terrain. The processes of pan formation and alteration of pan sediments (essentially residual deposits) is ongoing, biocorrosion being implicated as an important mechanism. Incongruent kaolinite dissolution, to leave a silica residuum, a hitherto apparently unrecognized process, raises the possibility that silcrete may form as a relative accumulation which is synchronous with lateritic leaching in more elevated topographic positions.

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The fractal shape of sutured quartz grain boundaries: application as a geothermometer

Cited by 62 publications

References 0 publications

Petrology and tectonic evolution of the Kiskunhalas-NE fractured hydrocarbon reservoir, South Hungary

Petrology and tectonic evolution of the Kiskunhalas-NE fractured hydrocarbon reservoir, South Hungary

Complex evaluation of the Kiskunhalas-NE fractured metamorphic hydrocarbon reservoir

Processes of silicate karstification associated with pan formation in the Darwin–Koolpinya area of northern Australia

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