Ocean Drilling Program (ODP) Leg 156 examined hydrological, geochemical, structural, and sedimentological processes at the toe of the northern Barbados accretionary prism (Shipley, Ogawa, Blum, et al., 1995). As part of this program, more than 400 samples were collected from Sites 948 and 949 for grain-size analysis. The primary objective of these analyses was to accurately determine weight per...

Measurements acquired by the Mars Orbiter Laser Altimeter on board the Mars Global Surveyor indicate that large drainage systems on Mars have geomorphic characteristics inconsistent with prolonged erosion by surface runoff. We find the topography has not evolved to an expected equilibrium terrain form, even in areas where runoff incision has been previously interpreted. By analogy with terrestr...

In this paper numerous known spectral analysis methodologies available to geologic remote sensing are reviewed. According to their requirement for reference data, the techniques are categorized into knowledge-based (KB) or data-driven (DD) approaches. The two categories are comparatively studied and their advantages, disadvantages, and major geologic outcomes are emphasized. Next ways to bridge...

Modeling the geologic architecture of an aquifer and visualizing its three-dimensional structure require lithologic data recorded during well drilling. Uncertainties in layer boundaries arise due to questionable quality of drilling records, mixing during the drilling process, which results in blurred contacts, and natural heterogeneity of the geologic materials. An approach for modeling and vis...

Khatunabad area is situated geologically in UrmiehDokhtar magmatic belt in NW of Iran. In this research, studied area has been investigated in order to recognize the potential copper and molybdenum-bearing target areas. The survey layers include the lithologic units, alteration, geochemical result, tectonics and copper and molybdenum occurrence. As an accurate decision can have a considerable e...

Ancient organic-rich mudstones (black shales) are the most important type of source rock for oil and gas. Black shales are, however, highly variable in their lithologic and geochemical character and in the environmental controls responsible for their formation. Although water-column stratification and bottomwater oxygen depletion are features common to most environments favoring accumulation of...

This paper reports the results of tests on Indiana gravels ranging from good to poor in field performance in Portland cement concrete. The gravels were separated by heavy liquid flotation into various specific gravity ranges. The gravel fractions thus obtained were tested to deter­ mine absorption, specific gravity, degree of saturation, lithologic compo­ sition and durability in air entrained ...