Ribbon spacing in Venusian tessera: Implications for layer thickness and thermal state

Details Ribbon spacing in Venusian tessera: Implications for layer thickness and thermal state Ribbon spacing in Venusian tessera: Implications for layer thickness and thermal state

Oct 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29t..61g&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 20, pp. 61-1, CiteID 2000, DOI 10.1029/2002GL015994

Physics

2

Planetology: Solar System Objects: Venus, Structural Geology: Local Crustal Structure, Structural Geology: Fractures And Faults, Planetary Sciences: Tectonics (8149), Tectonophysics: Rheology-Crust And Lithosphere

Scientific paper

We report on measurements of characteristic extensional wavelength represented by ribbons in Venusian tessera terrain. Fourier power spectra for ribbons in 35 areas from 9 geographic regions show dominant wavelengths of 2 to 6 km. We used these values to estimate mechanical layer thickness during ribbon formation at 0.6 to 2.9 km. Because ribbons accommodate extension of a single strong layer overlying a ductile substrate, we conclude that the base of this mechanical layer corresponded to the local brittle-ductile transition (BDT) during ribbon formation. Maintaining a BDT at <3 km depth for a significant length of time requires a locally hot environment, as over a plume impinging on thin lithosphere. These results indicate that locally hot conditions prevailed at widely distinct locations in the past.

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