Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 3 of 3
Full-Text Articles in Entire DC Network
A Review Of Structural Patterns And Melting Processes In The Archean Craton Of West Greenland: Evidence For Crustal Growth At Convergent Plate Margins As Opposed To Non-Uniformitarian Models, Ali Polat
Earth & Environmental Sciences Publications
The Archean craton of West Greenland consists of many fault-bounded Eoarchean to Neoarchean tectonic terranes (crustal blocks). These tectonic terranes are composed mainly of tonalite-trondhjemite-granodiorite (TTG) gneisses, granitic gneisses, metavolcanic-dominated supracrustal belts, layered anorthositic complexes, and late- to post-tectonic granites. Rock assemblages and geochemical signatures in these terranes suggest that they represent fragments of dismembered oceanic island arcs, consisting mainly of TTG plutons, tholeiitic to calc-alkaline basalts, boninites, picrites, and cumulate layers of ultramafic rocks, gabbros, leucogabbros and anorthosites, with minor sedimentary rocks. The structural characteristics of the terrane boundaries are consistent with the assembly of these island arcs through …
Forecasting The Response Of Earth's Surface To Future Climatic And Land Use Changes: A Review Of Methods And Research Needs, J.D. Pelletier, Murray A. Brad, J.L. Pierce, P.R. Bierman, D.D. Breshears
Forecasting The Response Of Earth's Surface To Future Climatic And Land Use Changes: A Review Of Methods And Research Needs, J.D. Pelletier, Murray A. Brad, J.L. Pierce, P.R. Bierman, D.D. Breshears
Earth & Environmental Sciences Publications
In the future, Earth will be warmer, precipitation events will be more extreme, global mean sea level will rise, and many arid and semiarid regions will be drier. Human modifications of landscapes will also occur at an accelerated rate as developed areas increase in size and population density. We now have gridded global forecasts, being continually improved, of the climatic and land use changes (C&LUC) that are likely to occur in the coming decades. However, besides a few exceptions, consensus forecasts do not exist for how these C&LUC will likely impact Earth-surface processes and hazards. In some cases, we have …
Differentiating Tidal And Groundwater Dynamics From Barrier Island Framework Geology: Testing The Utility Of Portable Multifrequency Electromagnetic Induction Profilers, B.A. Weymer, M.E. Everett, Chris Houser, P. Wernette, P. Barrineau
Differentiating Tidal And Groundwater Dynamics From Barrier Island Framework Geology: Testing The Utility Of Portable Multifrequency Electromagnetic Induction Profilers, B.A. Weymer, M.E. Everett, Chris Houser, P. Wernette, P. Barrineau
Earth & Environmental Sciences Publications
Electromagnetic induction (EMI) techniques are becoming increasingly popular for near-surface coastal geophysical applications. However, few studies have explored the capabilities and limitations of portable multifrequency EMI profilers for mapping large-scale (101-102 km) barrier island hydrogeology. The purpose of this study is to investigate the influence of groundwater dynamics on apparent conductivity σa to separate the effects of hydrology and geology from the σa signal. Shorenormal and alongshore surveys were performed within a highly conductive barrier island/wind-tidal flat system at Padre Island National Seashore, Texas, USA. Assessments of instrument calibration and signal drift suggest that σa measurements are stable, but vary …