3-D magnetotelluric inversion and model validation with gravity data for the investigation of flood basalts and associated volcanic rifted margins

Details 3-D magnetotelluric inversion and model validation with gravity data for the investigation of flood basalts and associated volcanic rifted margins 3-D magnetotelluric inversion and model validation with gravity data for the investigation of flood basalts and associated volcanic rifted margins

Sep 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007geoji.170.1418h&link_type=abstract

Geophysical Journal International, Volume 170, Issue 6, pp. 1418-1430.

Astronomy and Astrophysics

Astronomy

1

3-D Inversion, Gravity, Magnetotellurics, Rifted Margin

Scientific paper

20 magnetotelluric (MT) soundings were collected on the Isle of Skye, Scotland to provide a high-resolution three-dimensional (3-D) electrical resistivity model of a volcanic province within the framework of a project jointly interpreting gravity, seismic, geological and MT data. The full 3-D inversion of the MT data jointly interpreted with gravity data reveals upper crustal structure. The main features of the model are interpreted in conjunction with previous geological mapping and borehole data. Our model extends to 13km depth, several kilometres below the top of the Lewisian basement. The top of the Lewisian basement is at approximately 7-8km depth and the topography of its surface was controlled by Precambrian rifting, during which a 4.5km thick sequence of Torridonian sediments was deposited. The Mesozoic sediments above, which can reach up to 2.2km thick, have small-scale depocentres and are covered by up to 600m of Tertiary lava flows. The interpretation of the resistivity model shows that 3-D MT inversion is an appropriate tool to image sedimentary structures beneath extrusive basalt units, where conventional seismic reflection methods may fail.

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