Analysis of aeromagnetic measurements from the Cascade Range in central Oregon

Geophysics ◽  
1983 ◽  
Vol 48 (3) ◽  
pp. 376-390 ◽  
Author(s):  
G. Connard ◽  
R. Couch ◽  
M. Gemperle
Keyword(s):  
Heat Flow ◽  
Curie Point ◽  
Hot Springs ◽  
Magnetic Anomalies ◽  
High Heat ◽  
Cascade Range ◽  
Thermal Gradients ◽  
Tectonic Structures ◽  
Basin And Range Province ◽  
Lateral Offset

Shallow Curie‐point isotherm depths, indicated by the analysis of magnetic anomalies, young silicic volcanism, hot springs, and high heat flow mark the Cascade Range of central Oregon as a potentially important geothermal resource area. Aeromagnetic measurements in the central Cascades between 43°00′ and 44°15′N latitude and 121°00′ and 122°30′W longitude exhibit predominant northwest‐southeast lineations and less prominent north‐northeast by south‐southeast lineations. Longer wavelength components of the magnetic anomalies (greater than 25 km), possibly related to deeper sources, trend approximately north‐south parallel to the Cascade Range. Magnetic anomalies show a right‐lateral offset of the High Cascades Volcanism at 43°30′N latitude, which is consistent with the tectonic structures of the Basin and Range province southeast of the area. Magnetic source depth calculations show that the High Cascades occupy a structural depression or graben on the eastern side of the Western Cascades. Spectral analysis of the magnetic anomalies suggests that the High Cascades are underlain by Curie‐point isotherm depths as shallow as 9 km. These shallow Curie‐point isotherm depths imply thermal gradients greater than 50°C/km and surface heat flow greater than [Formula: see text].

scholarly journals Estimation of Geothermal Gradient and Heat Flow for Determination of Geothermal Energy Sources in Monguno Area of Northeastern Nigeria

2019 ◽  
pp. 1-8
Author(s):  
B. C. Udochukwu ◽  
M. Akiishi ◽  
A. A. Tyovenda
Keyword(s):  
Heat Flow ◽  
Curie Point ◽  
Geothermal Energy ◽  
Geothermal Gradient ◽  
High Heat ◽  
Curie Point Depth ◽  
The South ◽  
Geothermal Resources ◽  
North East ◽  
Curie Depth

The aeromagnetic data of Monguno area northeastern Nigeria have been used to estimate Curie point depth, geothermal gradients and heat flow using spectral analysis. These geothermal parameters were subsequently employed to identify areas of geothermal resources. First order polynomial fitting was applied in Regional-residual separation. The Curie point depth obtained in this area ranges from 10.318 to 24.476 km with an average of 13.387 km, the geothermal gradient of the area varies from 23.697 to 56.212°C /km, with an average of 46.195°C /km, while the heat flow ranges from 59.242 to 136.176 mWm-2, with an average value of about 112.364 mWm-2. It was also observed that the deepest Curie depth in the area is identified in the south, while the shallow depth is located in the northeast and spread toward the southwest. On the other hand, the highest geothermal gradient in the area is identified in the northern part of Moguno, while in the south,                    the lowest, geothermal gradient is located. The highest heat flow in the area is seen in the south-west and north-east, while the lowest heat flow is observed in the south. The high heat flow and geothermal gradient in the area show that geothermal energy could be found in Monguno region of the northeastern Nigeria.

Heat flow in the Oregon Cascade Range and its correlation with regional gravity, Curie point depths, and geology

1990 ◽  
Vol 95 (B12) ◽  
pp. 19475 ◽  
Author(s):  
David D. Blackwell ◽  
John L. Steele ◽  
Michael K. Frohme ◽  
Charles F. Murphey ◽  
George R. Priest ◽  
...  
Keyword(s):  
Heat Flow ◽  
Curie Point ◽  
Cascade Range ◽  
Regional Gravity

A COMPARISON OF TERRESTRIAL HEAT FLOW AND TRANSIENT GEOMAGNETIC FLUCTUATIONS IN THE SOUTHWESTERN UNITED STATES

Geophysics ◽  
1969 ◽  
Vol 34 (3) ◽  
pp. 463-478 ◽  
Author(s):  
Robert E. Warren ◽  
John G. Sclater ◽  
Victor Vacquier ◽  
Robert F. Roy
Keyword(s):  
United States ◽  
Heat Flow ◽  
Upper Mantle ◽  
Basin And Range ◽  
High Heat ◽  
Fault System ◽  
Southwestern United States ◽  
Basin And Range Province ◽  
Magnetotelluric Data ◽  
Time Variations

Magnetic time‐variations between Tucson, Arizona and Sweetwater, Texas indicate that a zone of high electrical conductivity underlies the southwestern United States. The interpretation of this zone by Schmucker as a rise of the isotherms in the upper mantle is supported by six heat flow observations along the line of the geomagnetic profile. These and other observations indicate a high but variable heat flow in the Basin and Range Province which contrasts strongly with the uniform values of [Formula: see text] reported for the Texas Foreland. The width of this high heat flow anomaly, which may extend across the entire Basin and Range Province, suggests anomalously high temperatures in the upper mantle. This interpretation is further supported by magnetotelluric data between Phoenix, Arizona and Roswell, New Mexico and by the low seismic [Formula: see text] velocity and negative gravity anomaly. It is suggested that the “anomalous mantle” may be related to the tectonic evolution of the western United States and the late Cenozoic fault system.

scholarly journals GEOPHYSICAL INVESTIGATION TO ESTIMATE THE CURIE POINT DEPTH, HEAT FLOW AND GEOTHERMAL GRADIENT IN SOKO AND ANKPA, BENUE TROUGH NIGERIA

2020 ◽  
Vol 4 (2) ◽  
pp. 86-89
Author(s):  
J. A. Yakubu ◽  
J. C. Agbedo ◽  
N.M. Ossai
Keyword(s):  
Heat Flow ◽  
Curie Point ◽  
Clean Energy ◽  
Geothermal Gradient ◽  
High Heat ◽  
Curie Point Depth ◽  
Geophysical Investigation ◽  
Southeastern Part ◽  
Temperature Isotherm ◽  
High Geothermal Gradient

This work presents the interpretation of the aeromagnetic data over Soko and Ankpa area using spectral analysis method. The study area was divided into eight (8) equal spectral blocks in order to estimate the depth to the top boundary, centroid, Curie point depth, heat flow and geothermal gradient of the study area. The result of the analysis shows the range of the depths to the top boundary and centroid varies between 1.085 to 1.984 km and 6.151 to 8.730 km respectively. The Curie temperature isotherm ranges between 11.112 km and 15.476 km and the geothermal gradients associated with it ranges from 39.967 and 52.196 0 𝐶⁄𝑘𝑚. The corresponding values of heat flow ranges from 93.697 𝑚𝑊𝑚􀀀 and 130. 49􀀁 𝑚𝑊𝑚􀀀. From this analysis, it was observed that areas with high geothermal gradient correspond to high heat flow and an inverse relationship exists between the heat flow and the Curie point depth. With the high geothermal gradient especially at the southeastern part of the study area, there is a possibility of enough geothermal energy for exploration in order to boost and generate clean energy for electricity.

High heat flow at the SW passive margin of the Gulf of California

Terra Nova ◽  
2021 ◽  
Author(s):  
Rosa Maria Prol‐Ledesma ◽  
Juan Luis Carrillo De La Cruz ◽  
Marco‐Antonio Torres‐Vera ◽  
Alejandro Estradas‐Romero
Keyword(s):  
Heat Flow ◽  
Gulf Of California ◽  
High Heat ◽  
Passive Margin ◽  
High Heat Flow

scholarly journals Estimation of Curie-point depths, geothermal gradients and near-surface heat flow from spectral analysis of aeromagnetic data in the Loum – Minta area (Centre-East Cameroon)

2018 ◽  
Vol 27 (4) ◽  
pp. 1291-1299
Author(s):  
Jean Aimé Mono ◽  
Théophile Ndougsa-Mbarga ◽  
Yara Tarek ◽  
Jean Daniel Ngoh ◽  
Olivier Ulrich Igor Owono Amougou
Keyword(s):  
Spectral Analysis ◽  
Heat Flow ◽  
Curie Point ◽  
Surface Heat ◽  
Aeromagnetic Data ◽  
Near Surface ◽  
Geothermal Gradients ◽  
Surface Heat Flow
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