Bibliography of terrestrial impact structures

This bibliography lists 105 terrestrial impact structures, of which 12 are proven structures, that is, structures associated with meteorites, and 93 are probable. Of the 93 probable structures, 18 are known to contain rocks with meteoritic components or to be enriched in meteoritic signature-elements, both of which enhance their probability of having originated by impact. Many of the structures investigated in the USSR to date are subsurface features that are completely or partly buried by sedimentary rocks. At least 16 buried impact structures have already been identified in North America and Europe. No proven nor probable submarine impact structure rising above the ocean floor is presently known; none has been found in Antarctica or Greenland. An attempt has been made to cite for each impact structure all literature published prior to mid-1983. The structures are presented in alphabetical order by continent, and their geographic distribution is indicated on a sketch map of each continent in which they occur. They are also listed tables in: (1) alphabetical order, (2) order of increasing latitude, (3) order of decreasing diameter, and (4) order of increasing geologic age

Preparation of a geologic photo map and hydrologic study of the Yemen Arab Republic

There are no author-identified significant results in this report

Orientational Effects and Random Mixing in 1-Alkanol + Alkanone Mixtures

1-Alkanol + alkanone systems have been investigated through the data analysis of molar excess functions, enthalpies, isobaric heat capacities, volumes and entropies, and using the Flory model and the formalism of the concentrationconcentration structure factor (SCC(0)). The enthalpy of the hydroxyl-carbonyl interactions has been evaluated. These interactions are stronger in mixtures with shorter alcohols (methanol-1-butanol) and 2-propanone or 2-butanone. However, effects related to the self-association of alcohols and to solvation between unlike molecules are of minor importance when compared with those which arise from dipolar interactions. Physical interactions are more relevant in mixtures with longer 1-alkanols. The studied systems are characterized by large structural effects. The variation of the molar excess enthalpy with the alcohol size along systems with a given ketone or with the alkanone size in solutions with a given alcohol are discussed in terms of the different contributions to this excess function. Mixtures with methanol show rather large orientational effects. The random mixing hypothesis is attained to a large extent for mixtures with 1-alkanols ≠ methanol and 2-alkanones. Steric effects and cyclization lead to stronger orientational effects in mixtures with 3-pentanone, 4-heptanone, or cyclohexanone. The increase of temperature weakens orientational effects. Results from SCC(0) calculations show that homocoordination is predominant and support conclusions obtained from the Flory model.Ministerio de Ciencia e Innovación, under Project FIS2010-1695

LE JOINT INTERGRANULAIRE DANS LES ROCHES

Vue d'ensemble sur les divers aspects du joint intergranulaire dans les roches et l'intérêt de son étude. L'irrégularité du réseau intergranulaire correspond à l'extrême variabilité de granulométrie et de forme des grains. Importance des modèles structuraux du joint et des théories de son orientation dans l'étude morphogénétique du joint et du grain. Difficulté de révéler dans sa totalité le réseau intergranulaire par des procédés automatiques, bien que le joint intergranulaire soit dans les roches un lieu privilégié pour le développement des phases mineures, l'attaque chimique, la fusion, la fissuration thermique.An overall survey of some significant aspects and properties of the grain boundary in rocks. The irregular pattern of the boundary network is connected with a granulometry and a grain shape most liable to vary. The morphogenetic facts are accounted for by structural models and theories of intergranular boundary orientation. Visualizing the whole boundary network by automatic devices is no easy procedure, though the intergranular boundary in rocks is a preferential place for the growth of minor phases, chemical etching, melting and heat fissuration