Auflistung Geologie nach Titel
Anzeige der Dokumente 631-650 von 931
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Paired 10Be sampling of polished bedrock and erratic boulders to improve dating of glacial landforms: an example from the Western Alps
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Cosmogenic nuclide dating of glacial landforms may lead to ambiguous results for ice retreat histories. The persistence of significant cosmogenic concentrations inherited from previous exposure may increase the apparent ... -
Palaeoenvironmental evolution of the Tunisian carbonate platform margin - response to global oceanographic and climatic changes (Barremian-Aptian)
(Univ. Bremen, 2008)The Late BarremianLate Aptian interval was characterised by several major changes in the ocean/climate system related to the onset of the Mid-Cretaceous greenhouse world. North Africansedimentary deposits offer excellent ... -
Paleopedological record along the loess-paleosol sequence in Oberlaab, Austria
(E&G – Quaternary Science Journal; Vol.62)A detailed study of a loess-paleosol sequence in Oberlaab, Upper Austria, is presented with emphasis on macro- and micromorphological features, grain size distribution, rock magnetism properties, and weathering degree that ... -
Paleo‐denudation rates suggest variations in runoff drove aggradation during last glacial cycle, Crete, Greece
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Fluvial aggradation and incision are often linked to Quaternary climate cycles, but it usually remains unclear whether variations in runoff or sediment supply or both drive channel response to climate variability. Here we ... -
Paleo‐Hydrogeological Modeling to Understand Present‐Day Groundwater Salinities in a Low‐Lying Coastal Groundwater System (Northwestern Germany)
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Groundwater abstraction and drainage are considered to be the main drivers for the salinization of low‐lying coastal groundwater systems, while the role of past boundary conditions is less clear. In this study, 3‐D ... -
Particulate organic carbon (POC) in relation to other pore water carbon fractions in drained and rewetted fens in Southern Germany
; Höll, B. S.; Freibauer, A.; Stahr, K.; Drösler, M.; Schloter, M.; Jungkunst, H. F. (Biogeosciences, 2008)
Numerous studies have dealt with carbon (C) contents in Histosols, but there are no studies quantifying the relative importance of the individual C components in pore waters. For this study, measurements were taken of ... -
Partitioning the Uncertainty of Ensemble Projections of Global Glacier Mass Change
; ; Anderson, Brian; ; Champollion, Nicolas; ; ; ; Kraaijenbrink, Philip; Malles, Jan-Hendrik; ; Radi?, Valentina; ; ; Shannon, Sarah; van de Wal, Roderik; (Earth's Future, 2020)
Glacier mass loss is recognized as a major contributor to current sea level rise. However, large uncertainties remain in projections of glacier mass loss on global and regional scales. We present an ensemble of 288 glacier ... -
Paudorf locus typicus (Lower Austria) revisited
; Terhorst, Birgit; Peticzka, Robert; Thiel, Christine (E&G – Quaternary Science Journal; Vol.62)
The more than 12 m thick loess-paleosol sequence in Paudorf, Lower Austria, has been known for decades as locus typicus of the “Paudorfer Bodenbildung” (Paudorf paleosol). The upper section of the outcrop contains an up ... -
Pedotransfer Function for the Brunswick Soil Hydraulic Property Model and Comparison to the van Genuchten‐Mualem Model
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Modeling soil hydraulic properties requires an effective representation of capillary and noncapillary storage and conductivity. This is made possible by using physically comprehensive yet flexible soil hydraulic property ... -
Permeability Evolution During Shear Zone Initiation in Low-Porosity Rocks
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Using an innovative experimental set-up (Punch-Through Shear test), we initiated a shear zone (microfault) in Flechtingen sandstone and Odenwald granite under in situ reservoir conditions while monitoring permeability and ... -
Persistent Link Between Caribbean Precipitation and Atlantic Ocean Circulation During the Last Glacial Revealed by a Speleothem Record From Puerto Rico
; ; Winter, Amos; ; ; ; ; Mangini, Augusto; (Paleoceanography and Paleoclimatology, 2020-11-20)
The sensitivity of tropical Atlantic precipitation patterns to the mean position of the Intertropical Convergence Zone (ITCZ) at different time scales is well‐known. However, recent research suggests a more complex behavior ... -
Persistent Provenance of South Asian Monsoon‐Induced Silicate Weathering Over the Past 27 Million Years
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The development of the South Asian monsoon (SAM) and Himalaya‐Tibetan Plateau uplift were closely intertwined with some studies suggesting that uplift initiated the monsoon whereas others link tectonics with monsoon‐controlled ... -
Petrographical and petrophysical properties of sandstones: statistical analysis as an approach to predict material behaviour and construction suitability
(Environmental Earth Sciences, 2012)Most studies dealing with material properties of sandstones are based on a small data set. The present study utilizes petrographical and petrophysical data from 22 selected sandstones and ~300 sandstones from the literature ... -
Petrology, Geochemistry, and Geodynamic Implications of Basaltic Dyke Swarms from the Southern Continental Part of the Cameroon Volcanic Line, Central Africa
; ; Dongmo, Armand Kagou; (The Open Geology Journal, 2012)
Basaltic dyke swarms in the southern continental part of the Cameroon Volcanic Line (Bangangte, Dschang, Manjo areas) are tholeiitic in composition with 46 to 50 wt.% SiO 2 and have moderate Mg-numbers (53–59), ... -
Petrology, magnetostratigraphy and geochronology of the Miocene volcaniclastic Tepoztlán Formation: implications for the initiation of the Transmexican Volcanic Belt (Central Mexico)
Lenhardt, Nils; Böhnel, Harald;; Torres-Alvarado, Ignacio; ; Hinderer, Matthias (Bulletin of Volcanology, 2010)
The volcaniclastic Tepoztlán Formation (TF) represents an important rock record to unravel the early evolution of the Transmexican Volcanic Belt (TMVB). Here, a depositional model together with a chronostratigraphy of this ... -
Phase‐Field Simulations of Epitaxial Crystal Growth in Open Fractures With Reactive Lateral Flow
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Abstract Fluid flow in fracture porosity in the Earth's crust is in general accompanied by ...
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Physical analysis of an Antarctic ice core—towards an integration of micro- and macrodynamics of polar ice
Weikusat, Ilka;; ; Eichler, Jan; Faria, Sérgio H.; ; Kipfstuhl, Sepp; Sheldon, Simon; ; Dahl-Jensen, Dorthe; Kleiner, Thomas (Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2016)
Microstructures from deep ice cores reflect the dynamic conditions of the drill location as well as the thermodynamic history of the drill site and catchment area in great detail. Ice core parameters (crystal lattice-preferred ... -
Physical weathering of building stones induced by freeze–thaw action: a laboratory long-term study
(Environmental Earth Sciences, 2010)Damages to natural building stones induced by the action of frost are considered to be of great importance. Commonly, the frost resistance of building stones is checked by standardised freeze–thaw tests before using. ... -
Pinning down the solid-state polymorphism of the ionic liquid [bmim][PF6]
(Chemical Science, 2012)The solid-state polymorphism of the ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate, [bmim][PF6], has been investigated via low-temperature and high-pressure crystallisation experiments. The samples have ... -
Pinpointing Deep Geothermal Upflow in Zones of Complex Tectono-Volcanic Degassing: New Insights from Aluto Volcano, Main Ethiopian Rift
; Hutchison, W.; Driba, D.L.; ; Gizaw, B. (Geochemistry, Geophysics, Geosystems, 2019)
Active rifts release large amounts of gases from deep sources to the atmosphere by advection and diffusion processes along permeable fracture zones. The objective of this study is to develop geothermal exploration concepts ...
