Lithologic boundaries from gravity and magnetic anomalies over Proterozoic Dalma volcanics

Yadav, Pramod Kumar; Adhikari, Purushottam; Srivastava, Shalivahan; Maurya, Ved P.; Singh, Shubham; Singh, Roshan Kumar; Bage, Ashish K.

doi:10.1007/s12040-018-0918-3

Cited by 8 publications

(6 citation statements)

References 23 publications

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“…In order to have a better interpretation of the data, anomalies need to be separated based on the depth of causative bodies. Radially averaged power spectrum (RAPS) and upward continuation are commonly employed to segregate signals from overlapping sources (Keating et al ., 2011; Al‐Badani and Al‐Wathaf, 2018; Yadav et al ., 2018).…”

Section: Methodsmentioning

confidence: 99%

“…In a power spectrum‐wave number plot, the point where there is a change in slope is marked and projected to the depth‐wave number plot to get an estimate of the depths to top of the sources (Yadav et al ., 2018). The depth to top of shallow sources can be estimated from the large wave number region while the depth to top of deep sources can be inferred from the small wave number region (Yadav et al ., 2018).…”

Section: Methodsmentioning

confidence: 99%

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Interpretation of ground magnetic data in Suyoc, Mankayan Mineral District, Philippines

et al. 2021

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Ground magnetic surveys conducted in Suyoc, Mankayan, Benguet led to the delineation of features related to epithermal and porphyry copper targets in the area. High reduced to equator (RTE) anomalies are observed in areas with epithermal mineralization. The high RTE anomalies are attributed to hydrothermally altered rock with quartz veins. The previously recognized porphyry copper prospect in Palasaan (Mohong Hill) is characterized by low RTE anomaly surrounded by a high RTE anomaly. One explanation for this signature is the possible presence of a magnetic core and the destruction or absence of magnetite in the alteration haloes at the periphery of a porphyry prospect. Areas such as Mangga and Liten exhibit the same magnetic signatures. This distinct magnetic pattern coupled with observed alteration and mineralization signatures led to the interpretation of prospective blind porphyry deposits in these localities. Results of the study reveal the applicability of ground magnetic data in characterizing and extracting a potential area of mineralized zones at a regional scale.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Interpretation of ground magnetic data in Suyoc, Mankayan Mineral District, Philippines

et al. 2021

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“…(2) where, h is the depth of the source and w is the wavenumber [Yadav et al, 2018]. The energy spectrum is a 2D function of the energy relative to wavenumber and direction.…”

Section: Depth Estimation Of the Causative Sourcesmentioning

confidence: 99%

Determination of buried active faults and earthquake potential for Izmir and its surroundings (western Turkey) using aeromagnetic anomalies and seismological data

Erbek

Ateş

Dolmaz

2023

Annals of Geophysics

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The paper aims to delineate buried faults in Izmir city and its surroundings, western Turkey using aeromagnetic and seismological data. In this context, the geophysical data processing techniques including reduced‑to‑pole transform (RTP), power spectrum analysis, high-pass filter and second vertical derivative method (SVD) have been applied to the total field aeromagnetic data of the study area. First, to remove the undesirable effects caused by the dipolar nature of the Earth field, RTP transform has been applied to those data. Second, the average depths of the regional and residual sources in the region have been calculated as 16.84 km and 3.75 km, respectively using power spectrum analysis. After, to emphasize the effects of the residual anomalies, the high-pass filter has been applied to the RTP data. Finally, the second vertical derivative method (SVD) has applied to the filtered data for delineating the uncovering buried faults and their lineaments in the eastern part of the Aegean extension. The results from those methods show five major fault zones that could cause devastating earthquakes in the area. Especially, the study reveals for the first time that one of these faults which lies from Doganbey to the city center of Izmir in the literature actually reaches out to Manisa city in the NE direction. As a result, these lineaments can be evaluated as traces of buried faults could be an important clue in predicting earthquake potential. A comparison of seismicity map and the heat flow map shows that the region (between Cesme and Seferihisar) represented with a low b‑value has a high potential earthquake. The spatial distribution of the earthquakes, b‑values and heat flow values in the depths may be related to the existence thin lithospheric mantle. Furthermore, the region represented by strong aeromagnetic anomalies may be considered to be magmatic material arising from the magma filling inside the strike-slip faults. The fault structure observed on the SVD map are also important for the geothermal energy potential of the region as well.

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“…Analytical signals from the gravitational field are obtained using a fast Fourier transform (FFT) approach in the frequency domain (Blakely, 1996). Analytical signals from magnetic fields at a location (x,y) can be derived from three orthogonal total magnetic field gradients using the following equation (Roest et al, 1992;MacLeod et al, 1993;Yadav et al, 2018):…”

Section: Horizontal Gradient and Analytic Signalmentioning

confidence: 99%

The igneous rock intrusion beneath Ambon and Seram islands, eastern Indonesia, based on the integration of gravity and magnetic inversion: its implications for geothermal energy resources

Lewerissa¹,

Sismanto²,

Setiawan³

et al. 2020

Turkish J Earth Sci

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In general, geothermal systems in Indonesia are characterized by the manifestation of fluid at the surface with boiling temperatures, which occur in the area of Quaternary and active volcanoes along the volcanic arcs. All Quaternary volcanic regions are related to cooling magma or igneous rock intrusion, which in turn is a source of heat from the geothermal system in the active arc (Hochstein and Sudarman, 2008). Ambon is in the southern part of Seram Island, which belongs to the outer Banda arc (Figure 1). The Banda arc is mostly composed of mélange rocks as a result of Tertiary subduction (Marini and Susangkyono, 1999). From this process, Ambon and the surrounding islands have many geothermal manifestations that appear on the surface (Poorter et al., 1989). Several studies on the Banda arc in eastern Indonesia have been carried out previously. Milsom et al. (2001) qualitatively reviewed the short-wavelength high gravity anomalies around the Banda Sea caused by Ophiolite rock dominance. Widiwijayanti et al. (2004) conducted studies on the evolution of geodynamics in the Maluku sea based on three-dimensional (3D) inversion of the Earth's gravitational field. Fichtner et al. (2010) studied lithosphere layer subduction in the Seram Sea using a combination of full-waveform tomography and isotope ratios. Widiyantoro et al. (2011) determined a complex structural model of the lithosphere slab under the Banda arc using a seismic Abstract: Ambon and Seram islands in eastern Indonesia are located in the convergence zone of three major plates, causing this area to have many geothermal manifestations on the surface. A subsurface geological study on Ambon and Seram has been conducted based on the integration of gravity and magnetic inversion modeling to determine the intrusion of igneous rock as a potential source of geothermal energy. The gravity and magnetic inversion utilized gravity and magnetic anomaly data from the World Gravity Map (WGM) and the Earth Magnetic Anomaly Grid (EMAG), as well as the CRUST 1.0 global earth crust model, as the constraints. In general, gravity and magnetic anomalies in the study area are compatible, in which the southern part of Ambon is dominated by high anomalies and the northern part is covered by low anomalies associated with the Seram trench. The high anomaly is thought to be related to the intrusion of igneous rocks underneath the surface that have cooling and are rich in magnetic minerals, while the low anomaly is related to the destruction zone due to subduction in the north of Seram. The gravity inversion shows the distribution of subsurface rock density ranging from 1.86 g cm-3 to 2.82 g cm-3 , while magnetic inversion produces rock susceptibility contrast ranging from-0.0034 SI to 0.0058 SI. Based on Curie point depth analysis of magnetic data, the bottom depth of the magnetic source is estimated at 25 km. The 3D subsurface model of Ambon and Seram based on gravity and magnetic inversion shows a massive and evident intrusion pattern with high rock density and susceptibility contra...

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Lithologic boundaries from gravity and magnetic anomalies over Proterozoic Dalma volcanics

Cited by 8 publications

References 23 publications

Interpretation of ground magnetic data in Suyoc, Mankayan Mineral District, Philippines

Interpretation of ground magnetic data in Suyoc, Mankayan Mineral District, Philippines

Determination of buried active faults and earthquake potential for Izmir and its surroundings (western Turkey) using aeromagnetic anomalies and seismological data

The igneous rock intrusion beneath Ambon and Seram islands, eastern Indonesia, based on the integration of gravity and magnetic inversion: its implications for geothermal energy resources

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