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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
Molecular Dynamics Simulation of Pore-Size Effects on Gas Adsorption Kinetics in Zeolites Available to Purchase
Genesis of Sublayer, Footwall Breccia, and Associated Ni-Cu-Platinum Group Element Mineralization in the Sudbury Igneous Complex Open Access
Prominent thermal anomalies in the mantle transition zone beneath the Transantarctic Mountains Available to Purchase
The 16 April 2016 Ecuador Earthquake Damage Assessment Survey Available to Purchase
Shock metamorphic features in mafic and ultramafic inclusions in the Sudbury Igneous Complex: Implications for their origin and impact excavation Open Access
Seismic evidence for lithospheric foundering beneath the southern Transantarctic Mountains, Antarctica Available to Purchase
RADIOGENIC ISOTOPE SYSTEMATICS OF THE HURON CLAIM PEGMATITE AND THE SHATFORD LAKE PEGMATITE GROUP, WINNIPEG RIVER PEGMATITE DISTRICT, MANITOBA Available to Purchase
The Seismic Noise Environment of Antarctica Available to Purchase
The Seismic Noise Environment of Antarctica Available to Purchase
Grain-Size Components As Markers of Origin and Depositional Processes In the Coastal Zone of the Golfe Du Lion (Mediterranean Sea, France) Available to Purchase
Slow Slip Acceleration beneath Andaman Islands Triggered by the 11 April 2012 Indian Ocean Earthquakes Available to Purchase
History of Exploration and Commercialization of the Giant Pinedale Tight Gas Sand Field, Sublette County, Wyoming Available to Purchase
Abstract Pinedale field, located in Sublette County, Wyoming, is one of the largest natural gas fields in the United States. The discovery and commercialization of this field covers a period of nearly 60 years. During this time, many different companies and people were involved in bringing Pinedale to the point of commercial production. The field produces from the Upper Cretaceous Lance Formation on the Pinedale anticline. The Lance Formation is a series of stacked sandstones interbedded with siltstone, mudstone, and shale. The sandstones typically average about 7% porosity with permeabilities in the single-digit micro-Darcy range. In much of the Pinedale field, the Lance reservoir section is over 5500 ft (1700 m) thick, and it is typically overpressured throughout the section. The commercialization of the field was made possible through the convergence of a better understanding of the geology of the reservoir rocks and the nature of the field’s structure as revealed through the use of modern three-dimensional (3-D) geophysical data. This understanding permitted the development and utilization of modern drilling and completion practices that were developed during the drilling of the adjacent Jonah field and that continue to evolve today.
Glacier slip and seismicity induced by surface melt Available to Purchase
Significant Motions between GPS Sites in the New Madrid Region: Implications for Seismic Hazard Available to Purchase
Andaman Postseismic Deformation Observations: Still Slipping after All These Years? Available to Purchase
Influence of Mixtures of Grain-Size Populations on the Parametric and Modal Characteristics of Coastal Sands (Hérault, Mediterranean Sea, France) Available to Purchase
Progress in Understanding the Evolution of Nickel Laterites Available to Purchase
Abstract Nickel laterites are thick weathering profiles derived by leaching of ultramafic rocks by meteoric water. Olivine or derived serpentine provides the nickel. Profiles with economically significant deposits derive their Ni from 40-m (15−100 m, 10 th −90 th percentile range) thicknesses of protolith grading 0.16 to 0.3 percent Ni and 5.5 to 10.5 percent Fe. The profiles may be preserved in situ or transported to form a sedimentary unit that may be buried, lithified, and metamorphosed. From bottom upward, in situ nickel laterites may be comprised of silicate saprolite, a nontronite clay zone, high Co and Mn limonite or ferruginous saprolite, low Co and Mn limonite, and allocthonous cover. Any of these units may be absent due to erosion or nondeposition and, importantly, one or all may be siliceous, usually due to quartz precipitation in the saprolite zone. Nickel is leached downward from the limonite zone, added to the saprolite and nontronite zones, and left residually enriched in limonite. Strong supergene enrichment requires downward leaching into saprolite and fractured rock above a deep water table. Zones of strong passive jointing and pre- or synweathering fracture zones all may lead to an order of magnitude increase in the rate of advance of the weathering front. The rate of advance of the weathering front in tropical rain forest covered highlands is about 50m/m.y., regardless of whether the bed rock is ultramafic, dioritic, or felsic. Weathering fronts advance at progressively slower rates in terranes with less relief. Nickel laterite deposits accumulate on terraces or plateau landforms in karstlike basins or under semiarid peneplains. The topographic controls of in situ nickel laterite deposits can be understood in terms of structural controls and three long-term climatic and topographic scenarios. The scenarios include: (1) permanently wet rain- forest setting in tectonically active terrane with moderate relief, (2) a formerly wet peneplain that has evolved toward aridity, and (3) a formerly arid peneplain setting that has evolved into a permanently wet environment.