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The enthalpies of synthesized multicomponent gas hydrates and the influence of guest molecules such as [C.sub.2][H.sub.6], [C.sub.3][H.sub.8], and C[O.sub.2] on their thermal behavior were determined. It was seen that when the difference in guest-to-cavity size ratio between the replaced methane and the replacing guest molecule is significant.

The phase behavior of multicomponent gas hydrate systems formed from primarily methane-propane and methane-ethane-propane gas mixtures were investigated. These systems showed interesting behavior at P-T conditions close to the decomposition line of pure methane hydrate during which the formation and decomposition of hydrate crystals could be seen and the morphology of the system changed from larger euhedral crystals to a fine crystal foamy mass.

Focuses on a study which documented the mineral chemistry and boron-isotope composition of tourmaline in a suite of Palaeozoic to Mesozoic rock samples from the central Andes of Northwest Argentina. Geological setting and sample description; Techniques in analyzing boron isotopes; Chemical composition of whole-rocks and tourmalines.