MAGSAT DATA AND CURIE-DEPTH BELOW DECCAN FLOOD BASALTS (INDIA)

被引：13

作者：

AGRAWAL, PK

THAKUR, NK

NEGI, JG

机构：

[1] Theoretical Geophysics Group, National Geophysical Research Institute, Hyderabad

来源：

PURE AND APPLIED GEOPHYSICS | 1992年 / 138卷 / 01期

关键词：

MAGSAT; DECCAN TRAPS; SPECTRAL ANALYSIS; CURIE-DEPTH;

D O I：

10.1007/BF00876714

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

Ground and airborne magnetic data are severely disturbed due to random susceptibility variations in Deccan flood basalts. However, Magnetic Satellite (MAGSAT) data over the Deccan flood basaltic region of the Indian subcontinent exhibit filtering of surficial noise. Three passes over Deccan traps show a "low" at about 20-degrees-N latitude and a "high" at about 23-degrees-N latitude. Spectral analysis of these passes and an available 2-D MAGSAT vertical intensity map indicate a deep (40 +/- 4 km) magnetic interface. It is interesting to note that the determination of Curie-depth from MAGSAT matches and confirms the geothermal data model. The estimates correspond to the Moho depth derived from gravity and deep seismic sounding studies. The study suggests a continental shield-like geothermal gradient of about 14-degrees-C/km below the area.

引用

页码：61 / 75

页数：15

共 33 条

[1]

Balasundaram M.S., Srinivasan P.B., Koyna Earthquake and its Effect on the Koyna Hydro-electric Project, Proc. Symp. Koyna Earthquake of 11th December 1967 and Related Problems, Calcutta, June 1968, Indian J. Power and Rift Valley Development, Ind. Soc. Eng. Geol., 27, pp. 11-14, (1971)

[2]

Bhattacharya B.K., Morley L.W., The Delineation of Deep Crustal Magnetic Bodies from Total Field Aeromagnetic Anomalies, Journal of geomagnetism and geoelectricity, 17, pp. 237-252, (1965)

[3]

Bulina L.V., The Use of Airborne Magnetic Prospecting Data in Deep-seated Structure of the Earth's Crust within the Siberian Platform, Sovetskaya Geol., 5, pp. 134-138, (1961)

[4]

Choubey V.D., Pre-Deccan Trap Topography in Central India and Crustal Warping in Relation to Narmada Rift Structure and Volcanic Activity, Bulletin Volcanologique, 35, pp. 660-685, (1971)

[5]

Connard G., Couch R., Gamperle M., Analysis of Aeromagnetic Measurements from the Cascade Range in Central Oregon, Geophys., 48, pp. 376-390, (1983)

[6]

Curtis C.E., Jain S., Determination of Volcanic Thickness and Underlying Structures from Aeromagnetic Maps in the Silet Area of Algeria, Geophys., 40, pp. 79-90, (1975)

[7]

Gasparini P., Mantovani M.S.M., Corrado G., Rapolla A., Depth of Curie Temperature in Continental Shields: A Compositional Boundary, Nature, 278, pp. 845-846, (1979)

[8]

Hahn A., Kind E.G., Mishra D.C., Depth Estimation of Magnetic Sources by Means of Fourier Amplitude Spectra, Geophys. Pros., 24, (1976)

[9]

Hall D.H., Regional Magnetic Anomalies, Magnetic Units, and Crustal Structure in the Kenora District of Ontario, Canadian Journal of Earth Sciences, 5, pp. 1277-1296, (1968)

[10]

Hall D.H., Long Wavelength Aeromagnetic Anomalies and Deep Crustal Magnetisation in Manitoba and Northwestern Ontario, Canada, J. Geophys Res., 40, pp. 403-430, (1975)

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