Upper crustal resistivity structure of the East Pacific Rise near 13°N | Zendy

Evans R. L. | Zendy; Constable S. C. | Zendy; Sinha M. C. | Zendy; Cox C. S. | Zendy; Unsworth M. J. | Zendy

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Upper crustal resistivity structure of the East Pacific Rise near 13°N

Author(s) -

Evans R. L.,

Constable S. C.,

Sinha M. C.,

Cox C. S.,

Unsworth M. J.

Publication year - 1991

Publication title -

geophysical research letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.007

H-Index - 273

eISSN - 1944-8007

pISSN - 0094-8276

DOI - 10.1029/91gl02305

Subject(s) - geology , electrical resistivity and conductivity , depth sounding , crest , crust , seafloor spreading , geophysics , ridge , upper crust , amplitude , seismology , paleontology , oceanography , physics , quantum mechanics

An active source electromagnetic (EM) sounding has been conducted on the axis of the East Pacific Rise (EPR) at 13° 10′N. 1D inversion and modelling techniques, seeking resistivity as a function of depth, have been applied to 8 Hz amplitude data collected along the ridge crest. Resistivity is seen to increase monotonically between 50 m and 1 km below the seafloor, increasing from ∼1Ωm to around 90Ωm. We observe no intrinsic difference in upper crustal resistivity structure between the rise axis and 100,000 year old crust. Inferred surface porosities of 20% are larger than those recorded in 5.9 my old crust in DSDP hole 504B. Our data do not require, and lack sufficient information for, the reliable inclusion of a conductive termination to the model below 1.2 km.

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