Crustal structure at Nanga Parbat, northern Pakistan, from magnetotelluric soundings

Details Crustal structure at Nanga Parbat, northern Pakistan, from magnetotelluric soundings Crustal structure at Nanga Parbat, northern Pakistan, from magnetotelluric soundings

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997georl..24.2415p&link_type=abstract

Geophysical Research Letters, Volume 24, Issue 19, p. 2415-2418

Physics

10

Tectonophysics: Continental Tectonics-General

Scientific paper

A magnetotelluric survey in northern Pakistan contains effects from both 2-D and 3-D structure. Identification of the effects of the sediments along the Indus River valley using 3-D modeling permitted the selection of modes that could be accurately inverted with 2-D inversions. The resulting 2-D model reveals generally resistive (>500ohm-m) upper crust (0-8 km), a more conductive (30-50 ohm-m) middle to lower crust (8-40 km), and a resistive (>300ohm-m) upper mantle. Shallow crustal (<10km) conductors correlate with a hydrothermally altered fault zone and/or carbonaceous metamorphic rocks near the Raikot fault. A prominent midcrustal conductor located beneath Nanga Parbat is required to fit the data, but its depth, dimensions, and conductivity are poorly constrained by existing data.

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