Estimation of Depth to Bottom of Magnetic Sources (DBMS) Using Spectral Methods:Application on Iran's 
Aeromagnetic Data


The knowledge of temperature within the Earth is important to constrain the thermal structure and the rheological nature of the lithosphere. The depth to the bottom of magnetic sources (DBMS) has been conventionally used as a proxy for the Curie‐point depth (Curie depth) and the heat flow in the region. Based on investigations of aeromagnetic data over Iran it is found that the modified centroid method is found most suitable for the DBMS estimation while the window sizes are 5 times of the target depth or more.  
The shallow DBMS regions are highly correlated with the Ophiolite belts implying that the DBMS is not a good proxy for Curie depth.  
The DBMS of 40 km in the Makran implies that the region is underlain by thick sediments and an old cold oceanic lithosphere. 


Figure: DBMS from aeromagnetic data over Iran

Citation:

 

Kumar, R., Bansal, A. R., & Ghods, A.; Journal of Geophysical Research: Solid Earth, (2020) 125, e2019JB018119. https://doi.org/ 10.1029/2019JB018119