Analysis of vitrinite reflectance-burial depth relations in dynamic geological settings by the direct integration method.

敦, 山路

doi:10.3720/japt.51.197

Cited by 5 publications

(7 citation statements)

References 6 publications

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“…Barker & Goldstein 1990, Barker & Pawlewicz 1994, Mullis et al 2001) are applicable only to specific settings of particular thermal histories. However, as the calculated value for the overburden is in accordance with that obtained through the approach of Yamaji (1986), the calculated mean palaeo-geothermal gradient provides a good estimate of the palaeo-thermal history of the Sabero Coalfield. Nevertheless, the kinetic EASY % Ro approach (Sweeney & Burnham 1990) was used for calibration of the 1-D modelling of the empirical results.…”

Section: Resultssupporting

confidence: 78%

Hydrothermal fluids influence on the thermal evolution of the Stephanian sequence, the Sabero Coalfield (NW Spain)

Botor¹

2012

geol

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In the present study, the thermal history of the Late Carboniferous (Stephanian) coal-bearing sediments of the Sabero Coalfield has been reconstructed in order to elucidate coal rank. The Sabero Coalfield is located in a small intramontane coal-bearing basin along the Sabero-Gordón fault zone, one of the major E-W trending strike-slip fault systems of the southern part of the Cantabrian Zone (NW Spain). The total thickness of the Stephanian succession is in excess of 2,000 m, and is composed of siliclastic rocks and intercalated coal seams with tonsteins. Mean vitrinite reflectance values in the Stephanian rocks in the Sabero Coalfield are in the range from 0.61 to 3.14% Rr, but most values are in the range from 0.8 to 1.5% Rr (based on 84 samples). Average vitrinite reflectance gradient is high (0.73% Rr/km), which suggests high value of average paleogeothermal gradient (52 o C/km). The maximum paleotemperatures calculated from vitrinite reflectance values for the Stephanian rocks range between 89 o C (top of the Stephanian) and 195 o C (bottom of the Stephanian). Coalification of the organic matter in the Stephanian rocks was achieved in the Early Permian, and was most likely related to several almost simultaneous related to magmatic and hydrothermal activity during high subsidence period in the pull-apart basin. The primary, burial-related maturity pattern, was probably slightly overprinted by fluid migration event, which is supposed to have occurred in Early Permian time.

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Section: Resultssupporting

confidence: 78%

Hydrothermal fluids influence on the thermal evolution of the Stephanian sequence, the Sabero Coalfield (NW Spain)

Botor¹

2012

geol

View full text Add to dashboard Cite

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“…We agree that the various equations are applicable only to specific settings of particular thermal histories, as shown by our own results. However, as the calculated value for the overburden is in accordance with that yielded with the approach of Yamaji (1986), the calculated mean palaeo-geothermal gradient is seen to provide a good estimate of the real palaeo-thermal history of the CMB. Nevertheless, we used the kinetic EASY %Ro approach for calibration of the 1D modelling and obtained some reliable models (Model B) in the range of the empirical results.…”

Section: Thermal Historysupporting

confidence: 57%

“…According to this model, maximum temperatures for the Stephanian formations ranged between 185 and 200 C (top and bottom of San Francisco Formation, respectively). The thicker overburden contrasts with that determined by the methods of Yamaji (1986), Barker and Goldstein (1990) and Barker and Pawlewicz (1994) (Figs. 5 and 6).…”

Section: Palaeo-heat Flow and Burial Historymentioning

confidence: 54%

“…To obtain an estimate of the coalification gradient and the total overburden, the method of Yamaji (1986) was applied (see also Conolly 1989; Scheidt and Littke 1989).…”

Section: Anisotropy Of Vitrinite Reflectance (Avr)mentioning

confidence: 99%

“…In such cases isoreflectance lines should run parallel or sub-parallel to bedding (Yamaji 1986). Palaeo-geothermal gradients can be determined by converting the %Rr data into temperature values.…”

Section: Introductionmentioning

confidence: 98%

See 2 more Smart Citations

Coalification history of the Stephanian Ciñera-Matallana pull-apart basin, NW Spain: Combining anisotropy of vitrinite reflectance and thermal modelling

Frings

Lutz

Wall

et al. 2004

Int J Earth Sci (Geol Rundsch)

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The Stephanian Ciaeera-Matallana Basin of NW Spain comprises 1,500 m of alluvial to lacustrine coalbearing sediments, which were deposited in a late Variscan transtensional/transpressional pull-apart setting. The relationship between coalification pattern and rock deformation was evaluated by measurements of the anisotropy of vitrinite reflectance (AVR). The AVR ellipsoids reveal both pre-tectonic elements related to the bedding fabric and syn-tectonic elements related to folding, producing biaxial ellipsoid shapes with the maximum reflectance parallel to fold axes. The mean coalification gradient for the Stephanian succession is about 0.62 %Rr/km. Calculations of the mean palaeogeothermal gradient are presented on the basis of three different empirical equations. A palaeo-geothermal gradient of 85 C/km is considered the most realistic, with an overburden of about 1,000 m. 1-D numerical modelling of the burial history results in two possible scenarios, the most preferable involving a palaeo-heat flow of 150 mW/ m 2 and an overburden of ca. 1,050 m. These results indicate that maximum coalification was related to a localised but high palaeo-heat flow/-geothermal gradient. The anisotropy of vitrinite reflectance highlights the interactive and transitional nature of sedimentary compaction and rock deformation on the maturation of organic material within strike-slip fault zones.

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Numerical modelling of burial and temperature history as an approach for an alternative interpretation of the Bramsche anomaly, Lower Saxony Basin

Senglaub

Littke

Brix

2005

Int J Earth Sci (Geol Rundsch)

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The Lower Saxony Basin, Germany, is one of the several sedimentary basins within the Central European Basin system. In its southwestern part, anomalously high maturity of organic matter has been observed to reach 4.5% VRr in Upper Jurassic and Lower Cretaceous sedimentary rocks in an area which coincides with a magnetic and a positive gravimetric anomaly. This anomaly was often interpreted as the consequence of a deep-seated igneous intrusion, the socalled Bramsche Massif. However, results obtained from calibrated numerical modelling are not in accordance with this scenario. Instead, a burial by approximately 4 km of now-eroded Cretaceous rocks was revealed to be the probable cause for the anomaly. Data and modelling results from six boreholes and two pseudo-wells support this view.

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Analysis of vitrinite reflectance-burial depth relations in dynamic geological settings by the direct integration method.

Cited by 5 publications

References 6 publications

Hydrothermal fluids influence on the thermal evolution of the Stephanian sequence, the Sabero Coalfield (NW Spain)

Hydrothermal fluids influence on the thermal evolution of the Stephanian sequence, the Sabero Coalfield (NW Spain)

Coalification history of the Stephanian Ciñera-Matallana pull-apart basin, NW Spain: Combining anisotropy of vitrinite reflectance and thermal modelling

Numerical modelling of burial and temperature history as an approach for an alternative interpretation of the Bramsche anomaly, Lower Saxony Basin

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