Auflistung Geologie nach Titel
Anzeige der Dokumente 853-872 von 931
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The Phanerozoic thermo-tectonic evolution of northern Mozambique constrained by 40Ar/39Ar, fission track and (U-Th)/He analyses
(Univ. Bremen, 2007)Thermochronology, Fission track, (U-Th)/He, 40Ar/39Ar,Mozambique, Gondwana, supercontinent dispersal. - Results of thermochronometric investigations comprising 40Ar/39Ar hornblende and biotite, titanite and apatite fission ... -
The replacement of plagioclase feldspars by albite: observations from hydrothermal experiments
(Contributions to Mineralogy and Petrology, 2009)Oligoclase and labradorite crystals have been experimentally replaced by albite in an aqueous sodium silicate solution at 600°C and 2 kbars. The replacement is pseudomorphic and is characterised by a sharp chemical interface ... -
The Ries impact and its distal effects in sediments of Central Europe—A review
(Meteoritics & Planetary Science, 2023-03-23)The Ries impact is the most important cosmic event in the younger geological history of Europe. Its effects reach far beyond the area considered so far and are documented in manifold evidence. In this paper, the widely ... -
The Río de la Plata Craton: a review of units, boundaries, ages and isotopic signature
(International Journal of Earth Sciences, 2010)A review of the lithostratigraphic units in the Río de la Plata Craton and of new and previously published geochronological, isotopic and geophysical data is presented. Sm–Nd TDM model ages between 2.6 and 2.2 Ga characterize ... -
The Role of Fluid Seepage in the Erosion of Mesozoic Carbonate Escarpments
(Journal of Geophysical Research: Earth Surface, 2021-11-12)Mesozoic submarine carbonate escarpments are erosional features that host box canyons, the formation of which had been attributed to seepage erosion in view of their similarity to subaerial box canyons. The latter had been ... -
The Role of Rock Matrix Permeability in Controlling Hydraulic Fracturing in Sandstones
(Rock Mechanics and Rock Engineering, 2021-07-30)A concomitant effect of a hydraulic fracturing experimenting is frequently fluid permeation into the rock matrix, with the injected fluid permeating through the porous rock matrix (leak-off) rather than contributing to the ... -
The sediment record of Lake Ohrid (Albania/Macedonia) - new methodological approaches, tephrostratigraphy, chronology, and inferences of past climatic and environmental changes
(Univ. Köln, 2009)This thesis had two primary objectives: One objective was to explore and develop applications of Fourier transform infrared spectroscopy (FTIRS) for the quantification of biogeochemical properties in lake sediment; the ... -
The Sensitivity of Thermohaline Groundwater Circulation to Flow and Transport Parameters: A Numerical Study Based on Double-Diffusive Convection above a Salt Dome
(Transport in Porous Media, 2009)This article explores double-diffusive convective fluid motion in an aquifer above a salt dome. Aside from the ambient regional flow regime, the hydraulic conditions in an aquifer connected with a salt formation are ... -
The Sierra Ballena Shear Zone in the southernmost Dom Feliciano Belt (Uruguay): evolution, kinematics, and deformation conditions
(International Journal of Earth Sciences, 2009)The Sierra Ballena Shear Zone (SBSZ) is part of a high-strain transcurrent system that divides the Neoproterozoic Dom Feliciano Belt of South America into two different domains. The basement on both sides of the SBSZ shows ... -
The suitability of metallic iron for environmental remediation
(Environmental Progress & Sustainable Energy, 2009)Aqueous contaminant removal in the presence of metallic iron is often regarded as a reductive transformation mediated by the Fe0 surface. However, successful removal of theoretically non-reducible contaminants has been ... -
The Suitability of Pozzolan as Admixing Aggregate for Fe0-Based Filters
(Water, 2018)Continuous gravity-fed column experiments using the methylene blue (MB) discoloration method were performed to characterize the suitability of a pozzolan (PZ) specimen as alternative admixing aggregate for metallic iron ... -
The supercritical question for pyroclastic dune bedforms: An overview
(Sedimentology, 2021-05-07)Sedimentary structures deposited from dilute pyroclastic currents are largely dominated by the products of metre‐scale dune bedforms containing backset lamination. Since the first seminal works in the 1970s, the vast ... -
The tectonic significance of K/Ar illite fine-fraction ages from the San Luis Formation (Eastern Sierras Pampeanas, Argentina)
(International Journal of Earth Sciences, 2011)The Sierra de San Luis forms the southern tip of the Eastern Sierras Pampeanas in central Argentina. Two narrow belts of low-grade phyllites and quartz arenites, i.e. the San Luis Formation, have accommodated part of the ... -
The terrestrial impact crater record: A statistical analysis of morphologies, structures, ages, lithologies, and more
(Meteoritics & Planetary Science, 2021-06-30)Abstract The number of newly discovered and confirmed impact structures on earth is growing continuously. In this review paper, the main attributes of 198 confirmed impact structures and 10 further structures, for which ... -
The transpressional connection between Dom Feliciano and Kaoko Belts at 580–550 Ma
(International Journal of Earth Sciences, 2010)A new U–Pb SHRIMP age of 551 ± 4 Ma on a mylonitic porphyry that intruded into the Sierra Ballena Shear Zone (Southernmost Dom Feliciano Belt, Uruguay) and a review of relevant published data make possible a more refined ... -
The Upper Jurassic Garedu Red Bed Formation of the northern Tabas Block: elucidating Late Cimmerian tectonics in east-Central Iran
(International Journal of Earth Sciences, 2021-02-17)The Garedu Red Bed Formation (GRBF) of the northern Tabas Block (Central-East Iranian Microcontinent, CEIM) is a lithologically variable, up to 500-m-thick, predominantly continental unit. It rests gradually or unconformably ... -
Thermo‐erosional valleys in Siberian ice‐rich permafrost
(Permafrost and Periglacial Processes, 2020-10-28)Thermal erosion is a major mechanism of permafrost degradation, resulting in characteristic landforms. We inventory thermo‐erosional valleys in ice‐rich coastal lowlands adjacent to the Siberian Laptev Sea based on remote ... -
Thermo‐Kinematic Evolution of the Eastern European Alps Along the TRANSALP Transect
(Tectonics, 2023-04-12)The eastern European Alps are shaped by the indentation of Adria into Europe. Recent tomography, depicting detached slab fragments, has been interpreted as evidence of continuous southward subduction of European lithosphere, ... -
Thickness of Fluvial Deposits Records Climate Oscillations
(Journal of Geophysical Research: Solid Earth, 2022-04-08)Fluvial deposits offer Earth’s best‐preserved geomorphic record of past climate change over geological timescales. However, quantitatively extracting this information remains challenging in part due to the complexity of ... -
Three-Dimensional Flow Above River Bedforms: Insights From Numerical Modeling of a Natural Dune Field (Río Paraná, Argentina)
(Journal of Geophysical Research: Earth Surface, 2019)Bedforms are ubiquitous features in rivers and shallow seas, as mobile sediment is transported by flowing water. The mutual interaction of hydrodynamics and bedform has been widely studied in the laboratory over two-dimensional ...