On application of fractal magnetization in Curie depth estimation from magnetic anomalies

Acta Geophysica

article

Li, Chun-Feng¹  Zhou, Duo¹  Wang, Jian³ 

[1] Department of Marine Sciences, Zhejiang University;Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology;Key Laboratory of Crustal Dynamics, Institute of Crustal Dynamics, China Earthquake Administration

关键词: Curie depth;    Geothermal structure;    Heat flow;    Fractal magnetization;    Magnetic anomalies;    Inversion;    North America;   

DOI  :  10.1007/s11600-019-00339-6

学科分类：地球科学(综合)

来源: Polska Akademia Nauk * Instytut Geofizyki

【 摘 要 】

As an independent geothermal proxy, the Curie-point depth has important geodynamic implications, but its estimation from magnetic anomalies requires an understanding of the spatial correlation of source magnetization, mathematically characterized by a fractal exponent. In this paper, we show that fractal exponent and Curie depth are so strongly inter-connected that attempts to simultaneous or iterative estimation of both of them often turn out to be futile. In cases of true large Curie depths, the iterative “de-fractal” method has a tendency of overcorrecting fractal exponents and thereby producing erroneously small Curie depths and smearing out true geological trends. While true fractal exponent can no way be constant over a large area, a regionally fixed fractal exponent is better than any mathematical treatments that are beyond the limit of data resolution and the underlying physics.

【 授权许可】

Unknown