An integrated geodynamic model of the Nankai subduction zone and neighboring regions from geophysical inversion and modeling

Li, Chun‐Feng

doi:10.1016/j.jog.2010.08.003

Cited by 32 publications

(17 citation statements)

References 89 publications

(134 reference statements)

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“…The Curie temperature for magnetite, the most abundant ferromagnetic mineral in the Earth's crust, is 580 °C. Here we estimated the depth to the bottom of the magnetic sources or depth of the Curie isotherm (Z b ) for Greenland using the de‐fractal spectral method (Bouligand et al, ; Khojamli et al, ; Martos et al, ; Salem et al, ) with a best fit for a fractal parameter of zero, which is equivalent to use of the centroid spectral method (Li, and references therein; Salazar et al, ; Tanaka et al, ; Vargas et al, ). We used an analysis window size of 350 km with an overlap of 57%, see supporting information and Figures S1–S4.…”

Section: Methodsmentioning

confidence: 99%

Geothermal Heat Flux Reveals the Iceland Hotspot Track Underneath Greenland

Martos

Jordan

Catalán

et al. 2018

Geophysical Research Letters

153

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Curie depths beneath Greenland are revealed by spectral analysis of data from the World Digital Magnetic Anomaly Map 2. A thermal model of the lithosphere then provides a corresponding geothermal heat flux map. This new map exhibits significantly higher frequency but lower amplitude variation than earlier heat flux maps and provides an important boundary condition for numerical ice‐sheet models and interpretation of borehole temperature profiles. In addition, it reveals new geologically significant features. Notably, we identify a prominent quasi‐linear elevated geothermal heat flux anomaly running northwest–southeast across Greenland. We interpret this feature to be the relic of the passage of the Iceland hotspot from 80 to 50 Ma. The expected partial melting of the lithosphere and magmatic underplating or intrusion into the lower crust is compatible with models of observed satellite gravity data and recent seismic observations. Our geological interpretation has potentially significant implications for the geodynamic evolution of Greenland.

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Section: Methodsmentioning

confidence: 99%

Geothermal Heat Flux Reveals the Iceland Hotspot Track Underneath Greenland

Martos

Jordan

Catalán

et al. 2018

Geophysical Research Letters

153

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“…One of the methods for examining the thermal structure of the crust is the estimation of the CPD using aeromagnetic data (Smith et al, 1977;Okubo et al, 1985Okubo et al, , 1989Okubo et al, , 1994Okubo et al, , 2003Tsokas et al, 1998;Tanaka et al, 1999;Stampolidis and Tsokas, 2002;Dolmaz et al, 2005;Ates et al, 2005;Aydin et al, 2005;Qingqing et al, 2008;Li et al, 2010;Li, 2011;Bilim, 2011;Manea and Manea, 2011;Abd El Nabi, 2012;Hisarli et al, 2012;Saleh et al, 2013;Sayed et al, 2013;Abraham et al, 2014;Obande et al, 2014;Starostenko et al, 2014). Various studies have shown correlations between Curie temperature depths and average crustal temperatures, leading to viable conclusions regarding lithospheric thermal conditions in a number of regions around the world (Ross et al, 2006;Rajaram, 2007;Bouligand et al, 2009).…”

Section: Centroid Depth Methods For Calculating Dbms 221 Random Magmentioning

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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“…Over the last several years, global compilations of magnetic anomalies become available at increasing resolutions (Figure b) [ Hamoudi et al ., ; Hemant et al ., ; Purucker , ; Maus et al ., ]. These valuable data assets, strengthened with improved data processing algorithms, open a new way of investigating large‐scale lithospheric magnetization and geothermal state [e.g., Purucker and Whaler , ; Bouligand et al ., ; Li et al ., ; Li , ; Purucker and Clark , ]. Being a good proxy to subsurface temperature variation, the mapped depth to the Curie‐point temperature puts an observable and direct constraint on the 3‐D geothermal structure of the Atlantic lithosphere, which cannot be easily assessed otherwise.…”

Section: Introductionmentioning

confidence: 99%

Thermal evolution of the North Atlantic lithosphere: New constraints from magnetic anomaly inversion with a fractal magnetization model

Wang

Lin

et al. 2013

Geochem Geophys Geosyst

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[1] Using recently published global magnetic models, we present the first independent constraint on North Atlantic geothermal state and mantle dynamics from magnetic anomaly inversion with a fractal magnetization model. Two theoretical models of radial amplitude spectrum of magnetic anomalies are found almost identical, and both are applicable to detecting Curie depths in using the centroid method based on spectral linearization at certain wave number bands. Theoretical and numerical studies confirm the robustness of this inversion scheme. A fractal exponent of 3.0 in the magnetic susceptibility is found suitable, and Curie depths are well constrained by their known depths near the mid-Atlantic ridge. While generally increasing with growing ages, North Atlantic Curie depths show large oscillating and heterogeneous patterns related most likely to small-scale sublithospheric convections, which are found to have an onset time around 40 Ma and a scale of about 500 km, and are in preferred transverse rolls. Hotspots in North Atlantic also contribute to large geothermal and Curie-depth variations, but they appear to connect more closely to geochemical anomalies or small-scale convection than to mantle plumes. Curie depths can be correlated to heat flow gridded in a constant 1 interval, which reveals decreasing effective thermal conductivity with depths within the magnetic layer. North Atlantic Curie points are mostly beneath the Moho, suggesting that the uppermost mantle is magnetized from serpentinization and induces long-wavelength magnetic anomalies. Small-scale convection and serpentinization together may cause apparent flattening and deviations in heat flow and bathymetry from theoretical cooling models in old oceanic lithosphere.

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An integrated geodynamic model of the Nankai subduction zone and neighboring regions from geophysical inversion and modeling

Cited by 32 publications

References 89 publications

Geothermal Heat Flux Reveals the Iceland Hotspot Track Underneath Greenland

Geothermal Heat Flux Reveals the Iceland Hotspot Track Underneath Greenland

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

Thermal evolution of the North Atlantic lithosphere: New constraints from magnetic anomaly inversion with a fractal magnetization model

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