“Draft:Mechanical thickness of the lithosphere”的意思、由来-开放百科全书

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Draft:Mechanical thickness of the lithosphere

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References

{{AFC submission|d|v|u=ErvinParoh|ns=118|decliner=I dream of horses|declinets=20190212174140|reason2=context|ts=20190212124340}} {{AFC comment|1=We generally need 3-5 inline citations in the draft before accepting. I dream of horses {{small|(My talk page) (My edits)}} @ 17:41, 12 February 2019 (UTC)}}
Mechanical thickness of the lithosphere is the estimated thickness of the elastic plate to substitute for lithosphere in order to investigate observed deformation. It is also presented as "effective" or "equivalent" elastic thickness T_e

T_e is largely dependent on the thermal structure of the lithosphere, its thickness and the coupling of crust with mantle.

For the oceanic lithosphere with coupled crust and mantle, T_e is usually taken to the base of the mechanical lithosphere (isotherm of 500 - 600 °C). This way it is also age dependent, as gradually thickens moving off the ridge.

For the continental lithosphere more aspects are taken under consideration, thermal age is only the estimate for slowly cooling cratonic areas, where mantle is involved and T_e reaches large values. If the crust is decoupled from mantle, value follows the average crustal thickness. Topography load is also important factor, significantly lowering the value of T_e.

Methods for T_e determination on continents are mostly based on thermal and rheological approach, but also on comparison of gravity anomalies and topography. For thermally young areas T_e is about 20-30 km, for older 40-50 km, cratons can reach more than 100 km. Determination of the effective elastic thickness is important for topography evolution studies, but also for glacial isostatic rebound and tectonic sea-level changes.

References

Watts, A.B.,Talwani, M. (1974). Gravity anomalies seaward of deep-sea trenches and their tectonic implications, Geophys. J. R. Astron. Soc., 36, doi:10.1111/j.1365246X.1974.tb03626.x

Burov, E.B., Diament, M. (1994). The effective elastic thickness (Te) of continental lithosphere: What does it really mean?. Journal of Geophysical Research: Solid Earth, American Geophysical Union,100 (B3), doi:10.1029/94JB02770

Tesauro, M. et al. (2012). The effective elastic thickness of the continental lithosphere: Comparison between rheological and inverse approaches, Geochem. Geophys. Geosyst., (G3), 13, 9, doi: 10.1029/2012GC004162

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