Pleistocene to present evaporitic lacustrine sediments in Lake Magadi, East African Rift Valley, Kenya were studied and mapped using spectral remote sensing methods. This approach incorporated surface mineral mapping using space-borne hyperspectral Hyperion imagery together with laboratory analysis, including visible, near-infrared diffuse reflectance spectroscopy (VNIR) measurements and X-ray ...

The term “geomechanics” means different things to people. We assert that in the petroleum industry broad consensus for a definition would probably be something like this: Geomechanics is discipline investigates rock mechanical behavior subsurface (i.e., at wellbore wall, overburden, cap rock, and/or reservoir) under present-day in-situ stress and pore pressure conditions or those changed throug...

Rock tensile strength (TS) is an important parameter for the initial design of engineering applications. The Brazilian (BTS) test suggested by International Society Mechanics and American Testing Materials widely used to assess TS rocks indirectly. Evaporitic rock blocks were collected from Al Ain city in United Arab Emirates. Samples tested, a database 48 samples was created. Although previous...

We describe the general characteristics and interactions happening at a unique, potential new Mars analogue site, located in Altiplano Atacama Desert region: Ojos del Salado inactive volcano. The interaction between rare snowing events strong winds transported large masses of porous volcanic grains there could produce decimeter - meter thick buried snow fast, shielded against sublimation for ex...

In the unusual aquatic Podostemaceae, the root is the leading organ of the plant body and is variously compressed and submerged as it adheres to rock surfaces in rapid water. In an anatomical comparison of the root apical meristems and root caps of 33 species that represent the major lineages of the family, the dorsiventrality of root meristems varied and was classified into four patterns: (1) ...

We conducted chemical and isotopic analyses to develop and test a hydrogeological model of thermomineral water circulation in a limestone aquifer system at Caldas da Rainha (Central Portugal), contributing to future borehole-drilling and development strategies, with the aim of extracting waters with the best possible flow and/or temperature. The thermomineral waters (T approximately 33 degrees ...

Impure reworked evaporitic sandstones, preserved on Meridiani Planum, Mars, are mixtures of roughly equal amounts of altered siliciclastic debris, of basaltic provenance (40F10% by mass), and chemical constituents, dominated by evaporitic minerals (jarosite, Mg-, Ca-sulfatesFchloridesFFe-, Na-sulfates), hematite and possibly secondary silica (60F10%). These chemical constituents and their relat...