Probing the Southern African Lithosphere With Magnetotellurics—Part I: Model Construction

Foundering lithosphere imaged beneath the southern Sierra Nevada, California, USA.

Seismic tomography reveals garnet-rich crust and mantle lithosphere descending into the upper mantle beneath the southeastern Sierra Nevada. The descending lithosphere consists of two layers: an iron-rich eclogite above a magnesium-rich garnet peridotite. These results place descending eclogite above and east of high P wave speed material previously imaged beneath the southern Great Valley, sug...

Is the African cratonic lithosphere wet or dry?

Thick continental lithosphere (tectosphere) beneath African cratons has been stable for ~2.5 b.y. despite its mechanical interaction with sublithospheric mantle. Water is known to have signifi cant infl uence on mechanical stiffness, and the depletion of water is often considered to be a key to preserving the thick lithosphere. Although water-rich environments indicated by the present water con...

PROBING THE ACTIVE SITE OF RHODANESE WITH DISULFIDE REAGENTS

construction of vector fields with positive lyapunov exponents

in this thesis our aim is to construct vector field in r3 for which the corresponding one-dimensional maps have certain discontinuities. two kinds of vector fields are considered, the first the lorenz vector field, and the second originally introced here. the latter have chaotic behavior and motivate a class of one-parameter families of maps which have positive lyapunov exponents for an open in...

Completion of the Southern African Large Telescope

The Southern African Large Telescope (SALT) was completed, on budget, in November 2005, in just under 6 years, and is currently in the middle of its commissioning and performance verification phase, expected to be concluded by early 2007. SALT partners have already been obtaining observations during this shake-down period, and night time hours devoted to science time has slowly risen to 65-75%....