Depth to the bottom of magnetic sources (DBMS) from aeromagnetic data of Central India using modified centroid method for fractal distribution of sources

Bansal, A. R.; Anand, S.; Rajaram, Mita; Rao, V. K.; Dimri, V. P.

doi:10.1016/j.tecto.2013.05.024

Cited by 71 publications

(35 citation statements)

References 63 publications

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“…The method used for DBMS calculation is very subjective and has to be constrained with independent information for a region. Because DBMS values are estimated from magnetic data, they may represent temperatures of petrological/compositional boundaries (Bansal et al, 2013). Information about temperature measurements in depth or data about expected mineralogy in the region are useful in this regard.…”

Section: Discussionmentioning

confidence: 99%

Estimating depth to the bottom of magnetic sources at Wikki Warm Spring region, northeastern Nigeria, using fractal distribution of sources approach

Abraham¹,

Obande²,

Chukwu³

et al. 2015

Turkish J Earth Sci

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The Wikki Warm Spring (WWS) is located on the Kerri-Kerri formation of tertiary age. This forms part of the Benue Basin, which links up with the Chad Basin in the north and extends southwest to the Anambra Basin in Nigeria. The stratigraphy of the WWS region consists of alluvium, the Kerri-Kerri formation, the Gombe formation, the Pindiga formation, the Yolde formation, the Bima formation, and basement rocks as the oldest. We estimate the depth to the bottom of magnetic sources (DBMS) in the WWS region using the fractal sources distribution approach on aeromagnetic data to identify the geothermal system of the WWS region. The adopted computational method is based on statistical methods of depth determination from the radial power spectrum assuming a fractal distribution of magnetic sources. The average estimated DBMS at the WWS source location is 10.72 ± 0.54 km. The obtained results imply an average thermal gradient of 54.11 °C km -1 and heat flow value of 135.28 mW/m 2 . Generally, shallow DBMS values are obtained in the northeastern region of the WWS area and these increase towards the southwestern region when regional variation patterns of estimated depths are considered. The generally shallow DBMS obtained in the study area is attributed to magmatic intrusion or diapirism in the subsurface and emphasizes the effects of large-scale tectonic events, particularly the basin-initiating event, as major influences on the thermal history. Results will contribute to decisions on where to drill boreholes for further geothermal energy exploration in the region.

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Section: Discussionmentioning

confidence: 99%

Estimating depth to the bottom of magnetic sources at Wikki Warm Spring region, northeastern Nigeria, using fractal distribution of sources approach

Abraham¹,

Obande²,

Chukwu³

et al. 2015

Turkish J Earth Sci

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“…Calculations of DBMS, which is commonly construed as the Curie-point depth, are made using diverse methods (Spector and Grant, 1970;Shuey et al, 1977;Leu, 1975, 1977;Okubo et al, 1985;Tanaka et al, 1999;Maus and Dimri, 1996;Finn and Ravat, 2004;Ravat et al, 2007;Bansal et al, 2013), namely the spectral-peak method (Spector and Grant, 1970;Shuey et al, 1977), the centroid method Leu, 1975, 1977;Okubo et al, 1985;Tanaka et al, 1999), the scaling spectral or power-law correction method (Maus and Dimri, 1996), forward modelling of the spectral-peak method (Finn and Ravat, 2004;Ravat et al, 2007), and the modified-centroid fractal method Nwankwo, 2015), among others. The conventional centroid method is used in this work for the reason that it gives better estimates with fewer depth errors compared to earlier methods (Ravat et al, 2007).…”

Section: Calculation Of Curie-point Depth Geothermal Gradient and Hmentioning

confidence: 99%

“…Several studies have shown that regional magnetic data can be used extensively to determine the thermal structure of the Earth's crust in various geologic environments (Spector and Grant, 1970;Leu, 1975, 1977;Byerly and Stolt, 1977;Blakely and Hassanzadeh, 1981;Okubo et al, 1985Okubo et al, , 2003Blakely, 1988Blakely, , 1995Maus et al, 1997;Tanaka et al, 1999;Chiozzi et al, 2005;Eppelbaum and Pilchin, 2006;Ross et al, 2006;Ravat et al, 2007;Trifonova et al, 2009;Gabriel et al, 2011Gabriel et al, , 2012Bansal et al, 2011Bansal et al, , 2013Bansal et al, , 2016Nabi, 2012;Hsieh et al, 2014;Nwankwo and Shehu, 2015;etc.). For example, dominant magnetic minerals in the Earth's crust pass from ferromagnetic to paramagnetic state at temperature, commonly called Curie-point temperature (CPT).…”

Section: Introductionmentioning

confidence: 99%

“…At temperature above CPT, the thermal agitation causes the spontaneous alignment of the various domains in the mineral to be destroyed (or randomized) to the extent that the ferromagnetic minerals become totally paramagnetic (Langel and Hinze, 1998). Therefore CPD, which is defined as the depth at which CPT is reached within the subsurface, can be considered as an index of depth to the bottom of magnetic sources (DBMS) and can consequently be calculated from geomagnetic anomalies (Bansal et al, , 2013Hsieh et al, 2014). However, in some circumstances DBMS can be caused by contrasts in lithology instead of CPT and may not necessarily coincide with CPT in detail Trifonova et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

“…Again, Trifonova et al (2009) pointed out that several studies have identified low-titanium titanomagnetite as the dominant magnetic phase, and CPTs at these depths are estimated to be between 575 and 600 • C. This confirms the estimated value of 580 • C by Stacey (1977) as the case in this study. Another important justification is that DBMS/CPD estimations can similarly be used to complement geothermal data in regions where deep boreholes are unavailable (Chapman and Furlong, 1992;Ross et al, 2006;Bansal et al, 2011Bansal et al, , 2013.…”

Section: Introductionmentioning

confidence: 99%

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Regional estimation of Curie-point depths and succeeding geothermal parameters from recently acquired high-resolution aeromagnetic data of the entire Bida Basin, north-central Nigeria

Nwankwo

Sunday

2017

Geoth. Energ. Sci.

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Abstract.A regional estimation of Curie-point depths (CPDs) and succeeding geothermal gradients and subsurface crustal heat flow has been carried out from the spectral centroid analysis of the recently acquired highresolution aeromagnetic (HRAM) data of the entire Bida Basin in north-central Nigeria. The HRAM data were divided into 28 overlapping blocks, and each block was analysed to obtain depths to the top, centroid, and bottom of the magnetic sources. The depth values were then used to assess the CPD, geothermal gradient, and subsurface crustal heat flow in the basin. The result shows that the CPD varies between 15.57 and 29.62 km with an average of 21.65 km, the geothermal gradient varies between 19.58 and 37.25 • C km −1 with an average of 27.25 • C km −1 , and the crustal heat flow varies between 48.41 and 93.12 mW m −2 with an average of 68.80 mW m −2 . Geodynamic processes are mainly controlled by the thermal structure of the Earth's crust; therefore this study is important for appraisal of the geo-processes, rheology, and understanding of the heat flow variations in the Bida Basin, north-central Nigeria.

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Curie Point Depth of the Iberian Peninsula and Surrounding Margins. A Thermal and Tectonic Perspective of its Evolution

et al. 2018

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In this work the thermal structure of the Iberian Peninsula is derived from magnetic data by calculating the bottom of the magnetization, assumed to be the Curie‐point depth (CPD) isotherm, which accounts for the depth at which magnetite becomes paramagnetic (580°C). Comparison of the CPD with crustal thickness maps along with a heat flow map derived from the CPD provides new insights on the lithospheric thermal regime. Within Iberia, the CPD isotherm has thickness in the range of 17 to 29 km. This isotherm is shallow (<18 km) offshore, where the lithosphere is thinner. In continental Iberia, the NW Variscan domain presents a magnetic response that is most probably linked to thickening and later extension processes during the late Variscan Orogeny, which resulted in widespread crustal melting and emplacement of granites (in the Central Iberian Arc). The signature of the CPD at the Gibraltar Arc reveals a geometry consistent with the slab roll‐back geodynamic model that shaped the western Mediterranean. In offshore areas, a broad extension of magnetized upper mantle is found. Serpentinization of the upper mantle, probably triggered in an extensional context, is proposed to account for the magnetic signal. The Atlantic margin presents up to 8 km of serpentinites, which, according to the identification of exhumed mantle, correlates with a hyperextended margin. The Mediterranean also presents generalized serpentinization up to 6 km in the Algerian Basin. Furthermore, a heat flow map and a Moho temperature map derived from the CPD are presented.

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Depth to the bottom of magnetic sources (DBMS) from aeromagnetic data of Central India using modified centroid method for fractal distribution of sources

Cited by 71 publications

References 63 publications

Estimating depth to the bottom of magnetic sources at Wikki Warm Spring region, northeastern Nigeria, using fractal distribution of sources approach

Estimating depth to the bottom of magnetic sources at Wikki Warm Spring region, northeastern Nigeria, using fractal distribution of sources approach

Regional estimation of Curie-point depths and succeeding geothermal parameters from recently acquired high-resolution aeromagnetic data of the entire Bida Basin, north-central Nigeria

Curie Point Depth of the Iberian Peninsula and Surrounding Margins. A Thermal and Tectonic Perspective of its Evolution

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