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  • 1
    Series available for loan
    Series available for loan
    Hannover : Niedersächsische Akademie der Geowissenschaften
    Associated volumes
    Call number: S 00.0063(13)
    In: Schriftenreihe der Deutschen Geologischen Gesellschaft
    Type of Medium: Series available for loan
    Pages: XIII, 171 S.
    ISBN: 3932537114
    Series Statement: Schriftenreihe der Deutschen Geologischen Gesellschaft 13
    Classification: A.3.1.
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 2
    Call number: S 97.0506(593-8)
    In: Tight gas reservoirs - natural gas for the future
    Description / Table of Contents: An integrated study was performed with the objective to improve reservoir quality prediction from 3D seismics, geological data and concepts. Seismic facies classes, derived from Neural Network analysis, correlate with reservoir characteristics. They can be used for predictive exploration purposes. Deformation zones indicate the extent of extensional fractures, which can have positive or negative effects on reservoir characteristics, depending on the diagenetic facies. The diagenetic conceptional model has been substantiated, verified in essential parts, and extended (inversion of reservoir qualities), based on well data, modelling and seismic analysis. Petroleum System Modelling added the time frame for diverse relevant processes and enabled to evaluate their effects on hydrocarbon migration. The importance of pre-oil hydrocarbon migration and spatial distance to Carboniferous source rocks for Rotliegend reservoir characteristics must be stressed.
    Type of Medium: Series available for loan
    Pages: Getr. Zählung
    Edition: Als Ms. gedr.
    ISBN: 3936418314
    Series Statement: DGMK-Forschungsbericht 593-8
    Classification: A.3.7.
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 3
    ISSN: 0016-7835
    Keywords: Key words Chilean Altiplano ; Plio-Pleistocene lake evolution ; Andean uplift and tectonism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  The intramontane Lauca Basin at the western margin of the northern Chilean Altiplano lies to the west of and is topographically isolated from the well-known Plio-Pleistocene lake system of fluvio-lacustrine origin that covers the Bolivian Altiplano from Lake Titicaca to the north for more than 800 km to the Salar de Uyuni in the south. The Lauca Basin is filled by a sequence of some 120 m of mainly upper Miocene to Pliocene clastic and volcaniclastic sediments of lacustrine and alluvial origin. Volcanic rocks, partly pyroclastic, provide useful marker horizons. In the first period (6–4 Ma) of its evolution, the 'Lago Lauca' was a shallow ephemeral lake. Evaporites indicate temporarily closed conditions. After 4 Ma the lake changed to a perennial water body surrounded by alluvial plains. In the late Pleistocene and Holocene (2–0 Ma) there was only marginal deposition of alluvial and glacial sediments. The basin formed as a half-graben or by pull-apart between 10 and 15 Ma (tectonic displacement of the basal ignimbrite sequence during the 'Quechua Phase′) and 6.2 Ma (maximum K/Ar ages of biotites of tuff horizons in the deepest part of the basin). Apart from this early basin formation, there has been surprisingly little displacement during the past 6 Ma close to the Western Cordillera of the Altiplano. Also, climate indicators (pollen, evaporites, sedimentary facies) suggest that an arid climate has existed for the past 6 Ma on the Altiplano. Together, these pieces of evidence indicate the absence of large scale block-faulting, tilt and major uplift during the past 5–6 Ma in this area.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1365-3121
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Maar craters often contain exceptionally preserved fossils and maar sediments may reflect detailed environmental changes. Volcanosedimentary processes in a Middle Eocene maar crater lake are illustrated by the deposits of Eckfeld Maar in the Tertiary Hocheifel Volcanic Field (Rhenish Massif, Germany). The maar origin of the basin is evident from a circular negative gravity anomaly which indicates a low-density funnel-shaped basin filling. From the facies analysis of an Eocene (Eckfeld) and a Pleistocene (Döttingen) maar we develop a lithozone classification for the interpretation of maar sediments: syn-/post-eruptive breccias are followed by a fining-upwards sequence of lacustrine mud with coarse layers and final swamp deposits. From the facies analysis and regional geological data we reconstruct the pre- to post-eruptive history of a maar crater prior to post-Eocene uplift. These observations can be used for the interpretation of Tertiary and Quaternary maar craters that are ideal fossil and sediment traps.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1365-3121
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: 40Ar/39Ar single-grain laserprobe dating of detrital white micas from early Oligocene to middle Miocene (31–14 Ma) sedimentary rocks of the central Swiss Molasse basin reveals three distinct clusters of cooling ages for the hinterland. Two Palaeozoic age clusters reflect cooling after the Variscan orogeny with only limited reheating during the Alpine orogeny. The third Tertiary age cluster reflecting late Alpine cooling is restricted to sediments younger than 20 Myr old. Micas with cooling ages 〈 30 Myr are interpreted to originate from the footwall of the Simplon detachment fault, thus representing formerly exposed upper levels of the present-day Lepontine metamorphic dome. Erosion of these levels is reflected by an increase of low-grade metamorphic lithic grains in the sandstones. This interpretation puts constraints on the timing of exhumation as well as on the evolution of the drainage pattern of the Central Alps.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1437-3262
    Keywords: Chilean Altiplano ; Plio-Pleistocene lake evolution ; Andean uplift and tectonism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The intramontane Lauca Basin at the western margin of the northern Chilean Altiplano lies to the west of and is topographically isolated from the well-known Plio-Pleistocene lake system of fluvio-lacustrine origin that covers the Bolivian Altiplano from Lake Titicaca to the north for more than 800 km to the Salar de Uyuni in the south. The Lauca Basin is filled by a sequence of some 120 m of mainly upper Miocene to Pliocene elastic and volcaniclastic sediments of lacustrine and alluvial origin. Volcanic rocks, partly pyroelastic, provide useful marker horizons. In the first period (6–4 Ma) of its evolution, the ‘Lago Lauca’ was a shallow ephemeral lake. Evaporites indicate temporarily closed conditions. After 4 Ma the lake changed to a perennial water body surrounded by alluvial plains. In the late Pleistocene and Holocene (2-0 Ma) there was only marginal deposition of alluvial and glacial sediments. The basin formed as a half-graben or by pull-apart between 10 and 15 Ma (tectonic displacement of the basal ignimbrite sequence during the ‘Quechua Phase’) and 6.2 Ma (maximum K/Ar ages of biotites of tuff horizons in the deepest part of the basin). Apart from this early basin formation, there has been surprisingly little displacement during the past 6 Ma close to the Western Cordillera of the Altiplano. Also, climate indicators (pollen, evaporites, sedimentary facies) suggest that an arid climate has existed for the past 6 Ma on the Altiplano. Together, these pieces of evidence indicate the absence of large scale block-faulting, tilt and major uplift during the past 5–6 Ma in this area.
    Type of Medium: Electronic Resource
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  • 7
    Publication Date: 1995-12-01
    Description: The intramontane Lauca Basin at the western margin of the northern Chilean Altiplano lies to the west of and is topographically isolated from the well-known Plio-Pleistocene lake system of fluvio-lacustrine origin that covers the Bolivian Altiplano from Lake Titicaca to the north for more than 800 km to the Salar de Uyuni in the south. The Lauca Basin is filled by a sequence of some 120 m of mainly upper Miocene to Pliocene elastic and volcaniclastic sediments of lacustrine and alluvial origin. Volcanic rocks, partly pyroelastic, provide useful marker horizons. In the first period (6–4 Ma) of its evolution, the ‘Lago Lauca’ was a shallow ephemeral lake. Evaporites indicate temporarily closed conditions. After 4 Ma the lake changed to a perennial water body surrounded by alluvial plains. In the late Pleistocene and Holocene (2-0 Ma) there was only marginal deposition of alluvial and glacial sediments. The basin formed as a half-graben or by pull-apart between 10 and 15 Ma (tectonic displacement of the basal ignimbrite sequence during the ‘Quechua Phase’) and 6.2 Ma (maximum K/Ar ages of biotites of tuff horizons in the deepest part of the basin). Apart from this early basin formation, there has been surprisingly little displacement during the past 6 Ma close to the Western Cordillera of the Altiplano. Also, climate indicators (pollen, evaporites, sedimentary facies) suggest that an arid climate has existed for the past 6 Ma on the Altiplano. Together, these pieces of evidence indicate the absence of large scale block-faulting, tilt and major uplift during the past 5–6 Ma in this area. ©1995 Springer-Verlag
    Print ISSN: 1437-3254
    Electronic ISSN: 1437-3262
    Topics: Geosciences
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  • 8
    Publication Date: 2014-07-04
    Description: We investigated the molecular composition of dissolved organic matter (DOM) from various rivers, bogs and soil sites to test for their ecosystems unique molecular patterns. This information is prerequisite for searching of new marker compounds that might help tracing the fate of ecosystem-derived organic matter from terrestrial to marine systems. We used electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry (ESI-FT-ICR-MS) to identify the ecosystem-specific molecular DOM characteristics. We investigated 39 samples and explored their patterns through nonmetric multidimensional scaling (NMDS). Based on the intrasystem similarity, we identified unique molecular formulae for each ecosystem and compared their main characteristics. Our data indicate a pH influence on all samples and possibly a vegetation influence on soil water samples. We interpreted the lack of nitrogen-containing compounds in the surface water and the lower molecular size in the soil water with higher microbial activity and reworking in soils and the lack of aromatic compounds in surface waters as the result of photo degradation. Our results demonstrate that this approach is suitable for resolving ecosystem-specific markers; the tannin molecular formulae seemed to be particularly suited markers for forest systems. However, we emphasize that it is necessary to collect a larger number of samples and reasonable environmental parameters to explain the distinctive molecular features and evaluate new markers. Aside from the ecosystem-specific features, we also found a suite of compounds that were present in all samples, indicating the convergent evolution of terrestrial DOM for a wide gradient of physicochemical and biological features. The molecular formulae of these ubiquitous compounds match those of carboxyl-rich alicyclic molecules (CRAM), but distinction from lignin is only possible by applying methods that elucidated the molecular structure.
    Electronic ISSN: 1539-1663
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
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  • 9
    Publication Date: 2015-09-13
    Description: The NE Tajik Basin in Central Asia, compressed between the ranges of the Tien Shan in the north and the Pamir in the south, is a key region for understanding the evolution of these mountain systems. Erosion and deposition history of the NE Tajik Basin and the adjoining orogens since the late Oligocene is reflected in the sedimentary record. The sedimentary rocks of the NE Tajik Basin are composed of thick units of proximal braided river deposits. They reflect large fluvial plains extending from the margins of the Northern Pamir and the Southern Tien Shan mountains, but are not related to the established lithostratigraphic scheme. Almost all Oligocene–Pliocene synorogenic deposits of the NE Tajik Basin were derived from the northern Pamir ranges, except upper Miocene–Recent proximal deposits close to the active margin of the Tien Shan. Initial uplift in some areas of the SW Tien Shan since the Oligocene was followed by a phase of low-energy sedimentation and a predominance of the southern source area. Since the middle Miocene, erosion of the ranges has occurred with the proximal sedimentation of coarse fluvial deposits along the northern margin of the Tajik Basin.
    Print ISSN: 0305-8719
    Electronic ISSN: 2041-4927
    Topics: Geosciences
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  • 10
    Publication Date: 2000-06-01
    Description: Observations of natural minerals and experimental run products show that I-S (illite-smectite mixed-layer minerals) with a high illite content as well as pure mica-illite crystallites can have a lath shape (aspect ratio 〉3). This shape is common to the I-S minerals under a variety of conditions of formation. The experiments presented indicate that the occurrence of lath-shaped mica-illite is due to a slow growth rate from supersaturated solutions. This lath-shaped crystallite is metastable as the ultimate stable shape is hexagonal. A longer period of crystal growth will replace the mica-illite laths with crystallites of a hexagonal form. Thus the presence of lath-shaped mica-illite indicates the existence of a metastable crystal form for this mineral.
    Print ISSN: 0009-8558
    Electronic ISSN: 1471-8030
    Topics: Geosciences
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