Review of Curie point depth determination through different spectral methods applied to magnetic data

Demarco, Pablo Núñez; Prezzi, Claudia Beatriz; Bettucci, Leda Sánchez

doi:10.1093/gji/ggaa361

Cited by 38 publications

(27 citation statements)

References 155 publications

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“…We did not use Curie depth estimates themselves because it was always by far the most dominant feature in first tests. Regarding the uncertainties behind the Curie depth estimation (Núñez Demarco et al., 2020; Pappa & Ebbing, 2021), we prefer an independent prediction. Therefore, we use magnetic data from the satellite magnetic lithosphere model LCS‐1 (Olsen et al., 2017).…”

Section: Datamentioning

confidence: 99%

Predicting Geothermal Heat Flow in Antarctica With a Machine Learning Approach

Lösing

Ebbing

2021

JGR Solid Earth

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In-situ observations from temperature gradient measurements are sparse and go along with several uncertainties like climatic changes or hydrothermal circulation (Burton-Johnson et al., 2020).To establish continent-wide heat flow models, one must refer to indirect methods using geophysical or geological data. The results differ immensely, for example, between magnetic and seismological data (e.g., An et al., 2015b;Martos et al., 2017), and the underlying assumptions cannot be easily combined (Lösing et al., 2020). While these different approaches usually take the respective sensitivity ranges into account, simplifications like a definition of laterally constant thermal parameters are not considered in the assessment. Recently, Shen et al. (2020) demonstrated how an updated seismic tomography model completely changed the estimated GHF and its uncertainties compared to earlier studies by Shapiro and Ritzwoller (2004). In ice-covered regions, different geophysical models show no consensus on magnitude and spatial distribution of heat flow (Rezvanbehbahani et al., 2019;Van Liefferinge, 2018).

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Section: Datamentioning

confidence: 99%

Predicting Geothermal Heat Flow in Antarctica With a Machine Learning Approach

Lösing

Ebbing

2021

JGR Solid Earth

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“…In a study of CPD on the eastern margin of the Tibetan Plateau (Gao et al, 2015), the estimation of Z 0 and Z t are in the range of 0.042-0.47 and 0.23-0.5 rad/km, respectively. However, a recent study (Demarco et al, 2020) has shown that the fitting of slope should be carried out in bands above 0.05 rad/km for Z t , and Z 0 should be obtained in the range of 0-0.05 rad/km. For shallower sources, the range for estimating Z 0 should extend to a higher wavenumber and that for calculating Z t should shrink to a low wavenumber.…”

Section: Estimation Of the Curie Point Depthmentioning

confidence: 99%

“…It is often assumed to be 580 °C, the Curie temperature of magnetite, a major magnetic mineral in the crust (Thébault et al, 2010). Sometimes CPD represents the petrological boundary instead due to the non-magnetic mantle rocks (Langel and Hinze, 1998;Demarco et al, 2020). The CPD is significant to reveal deep thermal structure of the lithosphere.…”

Section: Estimation Of the Curie Point Depthmentioning

confidence: 99%

“…To date, there is no consensus for the selection of window size. To ensure the response of the deepest magnetic layer, a larger window size should be selected (Demarco et al, 2020). Here, we use the window size of 2 °× 2 °, equivalent to the 220 × 220 km at the equator, and it meets the requirements of most studies.…”

Section: Estimation Of the Curie Point Depthmentioning

confidence: 99%

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Magnetic Structure and its Tectonic Implication Around Longmenshan Fault Zone Revealed by EMAG2v3

Lei

Jiao

et al. 2022

Front. Earth Sci.

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The formation of magnetic minerals is bound up with the tectonic evolution history, whereupon the distribution of magnetic anomalies has great meanings for regional tectonics. In this study, we use the latest global lithospheric magnetic field model EMAG2-v3, processed by various techniques including reduction to the pole (RTP), upward continuation, derivations, Euler deconvolution, estimation of total magnetization direction, and Curie point depth (CPD), to unveil the tectonics around Longmenshan fault zone (LFZ). LFZ is clearly displayed as a positive and negative anomaly transition zone in RTP anomalies and acts as a magnetic basement boundary. The Sichuan Basin (SB), located to the east of LFZ, is marked by strong magnetic basement and NE-strike banded induced positive anomalies which are associated with the Neoproterozoic magmatic activity. The banded shape, absence of radial pattern of anomalies, and existence of fossil subduction zone supports that the magnetic basement was formed in arc environment. The CPD in SB estimated by radial average power spectral is 30–51 km, which allows magnetic minerals in deep crust or even in lithospheric mantle to exhibit high magnetizations. The Songpan-Ganzi fold belt (SGFB), in contrast, is located to the west of LFZ and covered by thick and low-susceptibility Triassic deposits of flysch, manifests as weak negative anomalies caused by relatively shallow CPD and widespread remanent magnetization. Significant positive anomalies, appearing around the Manai and Rilonguan granitic massifs, indicate a strong magnetic basement beneath SGFB, which is conjectured as westward extension of the Yangtze Block at depth.

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“…[2021] evaluated 72 articles in terms of the wavenumber ranges. Núñez Demarco et al [2021] suggested mathematical validity of computation can be tested by comparing the results of equations ( 2) and (3) for 𝑧 𝑡 and ( 5) and ( 6) for 𝑧 𝑏 .…”

Section: Wavenumber Ranges For the Estimated Cpdmentioning

confidence: 99%

Estimation of Curie-Point Depths and Heat Flow from Spectral Analysis of EMAG2 Magnetic Data in Cyprus Island

Pamuk

Özsöz²

2022

Annals of Geophysics

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This study aims to determine Curie point depth (CPD), Heat flow and the boundaries of geological structures of Cyprus Island using EMAG2 magnetic data. CPD values were calculated by applying spectral analysis technique to magnetic anomaly map divided into 60 blocks (60x60 km2). Then, different thermal conductivity values (K=1, 1.5 and 2.5 Wm–1 K–1) and heat flow values were calculated using CPD values. CPD values ranged from 12.4 km to 28.18 km, and heat flow values were calculated between 20 and 50 mW/m2 for K=1. Shallow CPD values (CPD< 15km) were calculated in Polis, Morphou Bay, in the area between Larnaca and Famagusta and north of Kyrenia. Heat flow values are relatively high in these areas which can be researched in detail in terms of potential geothermal. In the final phase of the study, the boundaries of buried geological structures were determined by Analytic Signal (AS), Total Horizontal Derivative (THDR) and Tilt angle (TA) methods. Moho depth, Curie-Moho difference, 2D cross-correlation map of Moho and Curie depths and Earthquake distribution map are used for interpretation of the tectonic regime. Moho-Curie difference is roughly 0 and the 2D cross-correlation map produces higher (0.60-0.75) values in the southern part of the study area which might be evaluated as a passive crust. It is possible to say that few earthquakes are observed where the difference is around 0.

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Review of Curie point depth determination through different spectral methods applied to magnetic data

Cited by 38 publications

References 155 publications

Predicting Geothermal Heat Flow in Antarctica With a Machine Learning Approach

Predicting Geothermal Heat Flow in Antarctica With a Machine Learning Approach

Magnetic Structure and its Tectonic Implication Around Longmenshan Fault Zone Revealed by EMAG2v3

Estimation of Curie-Point Depths and Heat Flow from Spectral Analysis of EMAG2 Magnetic Data in Cyprus Island

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