Two examples of spectral approach to source depth estimation in gravity and magnetics

Pal, Poorna C.; Khurana, K. K.; Unnikrishnan, Poornima

doi:10.1007/bf00879978

Cited by 29 publications

(13 citation statements)

References 18 publications

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“…The spectral analysis method has been widely used to determine the depth to the top of magnetic source bodies without any prior knowledge of the geometry from the wavelengths of potential fields (Bhattacharyya 1966;Bhattacharyya andLeu 1975, 1977;Bansal and Dimri 2001;Bansal et al 2006;Chavez et al 1999;Curtis and Jain 1975;Gomez-Ortiz et al 2005;Hofstetter et al 2000;Lefort and Agarwal 2002;Nnange et al 2000;Pal et al 1979;Pamukcu et al 2007;Poudjom Djomani et al 1992;Rivero et al 2002;Spector and Grant 1970). This method for estimating the mean depth to ensembles of magnetic sources has been generalized to gravity data (Dimitriadis et al 1987) and can be used to map geologic structures from gravity and/or magnetic data observed at the earth's surface (Treitel et al 1971).…”

Section: Spectral Analysis Methods and Crustal Structurementioning

confidence: 98%

“…The high frequency domain is associated with shallow sources, and the low frequency domain is related to deeper sources; these are called residual and regional anomalies, respectively (Spector and Grant 1970). Following Pal et al (1979), the depth to a given ensemble of prismatic bodies, d, can be estimated from the power spectrum of the associated anomaly, by applying:…”

Section: Spectral Analysis Methods and Crustal Structurementioning

confidence: 99%

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Two-Dimensional Geothermal Modelling Along the Central Pontides Magmatic Arc: Implications for the Geodynamic Evolution of Northern Turkey

Maden

2011

Surv Geophys

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The Pontides, which can be divided tectonically into three main segments as Eastern, Central, and Western Pontides, is one of the most complex geodynamic settings within the Alpine belt. The Central Pontides, where the Eastern and Western Pontides met and formed a tectonic knot, represent an amalgamated tectonic mosaic consisting of remnants of oceanic, continental, and island arc segments. Subduction polarity, which is responsible for the formation of the Pontides, is still under debate because of limited geological, geophysical, and geochemical data. Two-dimensional (2-D) thermal modelling studies along the Central Pontides magmatic arc (Northern Turkey), Sakarya and Kırşehir continents are investigated in order to delineate the crustal thermal structure and subduction polarity. The obtained numerical results indicate that arc and back-arc regions are hot because of the cooling effects of a subducting plate. Moho temperatures in the investigated region are found between 992°C in the south (back-arc) and 415°C in the north (arc). Moreover, mantle heat flow values vary from 57.2 mWm -2 in the south (backarc) to 34.7 mWm -2 in the north (arc). It is shown from this study that the Eurasia plate had moved from north to south under the Anatolia plate along the south Black Sea coast.

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Section: Spectral Analysis Methods and Crustal Structurementioning

confidence: 98%

Section: Spectral Analysis Methods and Crustal Structurementioning

confidence: 99%

Two-Dimensional Geothermal Modelling Along the Central Pontides Magmatic Arc: Implications for the Geodynamic Evolution of Northern Turkey

Maden

2011

Surv Geophys

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“…The high and low wavenumber domains are associated with shallow and deep structures, called residual and regional anomalies, respectively. Following PAL et al (1979), the depth to a given ensemble of prismatic bodies d, can be estimated from the power spectrum of the associated anomaly, by applying: Figure 2 Low-pass filtered map of magnetic anomaly data of the study region for computing Curie-point depths. The contour interval is 50 nT Figure 3 Power spectrum of the Bouguer gravity data of the study region (GELIS¸LI and MADEN 2006).…”

Section: Methodsmentioning

confidence: 99%

Determination of the Crustal and Thermal Structure of the Erzurum-Horasan-Pasinler Basins (Eastern Türkiye) Using Gravity and Magnetic Data

Maden

Aydın

Kadirov

2014

Pure Appl. Geophys.

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The Erzurum-Horasan-Pasinler basin, which surrounds Miocene rocks, is oriented approximately E-W and is located in Eastern Anatolia (Türkiye). East Anatolia, where ophiolitic and young volcanic rocks are widespread, is situated in the Alpine-Himalayan fold-thrust fault belt. The NW-SE trending North Anatolian Transform Fault Zone and the NE-SW trending East Anatolian Transform Fault Zone, formed by the compressional regime of East Anatolia, control the main tectonics of the study region. While the Moho and Conrad depths of the study region are 43.0 and 20.9 km, respectively, the average sedimentary thickness has been determined to be 5.2 km by using the power spectrum method. On the other hand, it is found that the depth of the Moho in the region varies from 41.0 to 44.5 km and the depth of the Conrad discontinuity varies between 22 and 26 km, as computed using empirical equations. The basement of the sedimentary layer is calculated to be 6 km by using inversion results applied to the residual gravity data. The Curie point depth and average heat flow value in this region are calculated as 18.0 km and 89.1 m Wm -2 , respectively. Geotherm calculations reveal that the Moho temperature is 1,028.0°C based on the crustal model. The high heat flow values obtained are attributed to tectonic activities and melting of the lithospheric mantle caused by upwelling of the asthenosphere.

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“…The application of spectral analysis (SA) acknowledged many significant advances since its introduction in geophysics, as interpretation tool quantitative for potential field data by several authors [3] [46] [47] [53]- [60].…”

Section: Spectral Analysis (Sa)mentioning

confidence: 99%

2.5D Crustal Models Derived from Analytical Polynomial Separation Technique and Spectral Analysis of Gravity Data with Their Probable Gold Mineralization Migrations (Batouri, SE-Cameroon)

Claude¹,

Patrick²,

Igor³

et al. 2021

ARS

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Geophysical surveying is crucial in the investigation of mineral resources in poorly exposed areas such as SE-Cameroon, a region known for its gold mineral potential. In this paper, gravity survey is carried out in the Batouri area, SE-Cameroon based on land gravity data from the Centre-south Cameroon. Therefore, an analytical polynomial separation program, based on least-square fitting of a third-degree polynomial surface to the Bouguer anomaly map, was used to separate the regional/residual components in gravity data. This technique permitted to better understand the disposition of the deep and near surface structures responsible of the observed anomalies in the Batouri area. Spectral analysis and 2.5D modelling of two profiles P 1 (SW-NE) and P 2 (N-S) selected from the residual anomaly map provided depths to basement. These depths constrain the gravity models along the profiles, indicating a variable thickness of the sedimentary infill with an approximate anomaly of −33 mGal. The 2.5D model of the basement shows a gravity body, with a signature suggesting two close and similar masses, which characterize the quartzbearing formations associated here to granite and gneiss. Our work highlights a main heavy gravity: Gwé-Batouri anomaly, containing the major part of auriferous deposits located along the NE-SW direction. Further, three tectonic sub-basins bounded by normal faults have been highlighted at Guedal, Gwé, and Bélimban, in the south of Guedal-Bélimban depression.

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Two examples of spectral approach to source depth estimation in gravity and magnetics

Cited by 29 publications

References 18 publications

Two-Dimensional Geothermal Modelling Along the Central Pontides Magmatic Arc: Implications for the Geodynamic Evolution of Northern Turkey

Two-Dimensional Geothermal Modelling Along the Central Pontides Magmatic Arc: Implications for the Geodynamic Evolution of Northern Turkey

Determination of the Crustal and Thermal Structure of the Erzurum-Horasan-Pasinler Basins (Eastern Türkiye) Using Gravity and Magnetic Data

2.5D Crustal Models Derived from Analytical Polynomial Separation Technique and Spectral Analysis of Gravity Data with Their Probable Gold Mineralization Migrations (Batouri, SE-Cameroon)

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