Wang Z.,2014.pdf

Aeromagnetic anomaly zonation of the Ordos Basin and adjacent areas was obtained by processing high-precision and large-scale aeromagnetic anomalies with an approach of reduction to the pole upward

continuation. Comparative study on aeromagnetic and seismic tomography suggests that aeromagnetic

anomalies in this area are influenced by both the magnetic property of the rock and the burial depth of

the Precambrian crystalline basement. Basement depth might be the fundamental control factor for

aeromagnetic anomalies because the positive and negative anomalies on the reduction to the pole-upward-continuation anomaly maps roughly coincide with the uplifts and depressions of the crystal-line basement in the basin. The results, together with the latest understanding of basement faults,

SHRIMP U-Pb zircon dating of metamorphic rock and granite, drilling data, detrital zircon ages, and

gravity data interpretation, suggest that the Ordos block is not an entirety of Archean.

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