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DESCRIPTION
GeoBase is a multidisciplinary, international database supplying coverage for earth sciences, ecology, geomechanics, human geography and oceanography. It provides bibliographic information and abstracts of over 3,000 journals and archive coverage of several thousand additional titles. The material contained in the database includes references to scientific papers, trade journal and magazine articles, product reviews, directories and other material. Subject coverage includes: - Geology – mineralogy; geochemistry; sedimentary, igneous and metamorphic geology; stratigraphy; palaeontolgy; geophysics; environmental geology; economic geology and energy sources
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Source: | Elsevier Science | Print Equivalent: | Physical Geography; Human Geography; Geological Abstracts; Ecological Abstracts; International Development Abstracts; Oceanographic Literature Review; Geomechanics Abstracts | Years of Coverage: | 1980 - present | Frequency of Update: | monthly | Number & Type of Materials Covered: | 3,000+ scientific and technical journals; plus 2,000 additional sources that include refereed scientific papers, trade journals, magazine articles, product reviews, directories, books, conference proceedings and reports. | List of Journals Indexed: | http://www2.oclc.org/oclc/fs/fstitle | Languages Covered: | The database has significant coverage of non-English language sources, however 99.5% of entries include an English abstract. | Number of Records: | Over 950,000 | Records Added Annually: | Approximately 74,000 | | Other Features: | GeoBase is a multidisciplinary database supplying information for development studies, the Earth sciences, ecology, geomechanics, human geography, and oceanography. Its currentness and broad scope make it an ideal source for interdisciplinary research in the social, physical and environmental sciences. |
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Sample Record: Database: GEOBASE Ownership: FirstSearch indicates your institution subscribes to this publication. Libraries that Own Item: 368 Connect to the catalog at Johns Hopkins University Libraries Copyright: Copyright 2000 Elsevier Science Ltd. All rights reserved. Author(s): Langford R.P. ; Jackson M.L.W. ; Whitelaw M.J. Affiliation: R.P. Langford, Department of Geological Sciences, University of Texas at El Paso, El Paso, TX 79968 Country: United States E-mail: langford@geo.utep.edu
Title: The Miocene to Pleistocene filling of a mature extensional basin in Trans-Pecos Texas: Geomorphic and hydrologic controls on deposition
Source: Sedimentary Geology 128, no.1-2 (01 OCT 1999) p. 131-153 Additional Info: Netherlands
Standard No: ISSN: 0037-0738 Language: English Abstract: Northwest Eagle Flat Basin in Trans-Pecos (West) Texas, is a Late Tertiary-Quaternary extensional basin in the Basin and Range Province. The basin has largely filled with sediment, so that bedrock uplands only crop out around its rim. Movement on normal faults has effectively ceased, and the geomorphology and deposition differ from active extensional basins, where tectonism is the primary control on basin evolution. Eagle Flat differs from typical extensional basins because progressive changes in basin morphology caused by the aggrading basin-fill were the principal controls on sedimentation. A low-gradient alluvial basin floor expanded to cover the former, fault-defined basin margins. The playa lies on what was upland through the Miocene and Early Pliocene. Only the upper few meters of basin-fill crop out; however, a suite of 88 cores was drilled in the southern part of the basin. Nine of the cores and one trench were sampled for paleomagnetic reversal dating. Correlating the dated cores with interspersed cores allowed us to piece together the basin filling-history and explain how the mature features developed. The cores record the gradual burial of the southern half of the basin. The oldest basin-fill strata were cored in the deepest part of the basin, 219 m below the surface, at ˜12 Ma, in the Miocene. After deposition of 50 m of alluvial-fan gravel along the trend of an inferred normal fault, the basin floor aggraded and expanded. By the 780-ka Brunhes-Matuyama reversal, basin-floor drainage had reversed and was from the north. Sediment accumulation ended during the mid-Pleistocene. A fine-grained sediment supply that did not decrease, and outpaced subsidence was the primary control on basin deposition. This caused a progressive loss of relief and drainage-basin area as uplands were buried under the aggrading basin sediments. After the basin-margin faults were buried, the shape of the basin and its filling-history were little controlled by the original tectonically formed geomorphic elements. Descriptor: Sediments and sedimentary processes - transport -- 72.5.3 Geographic: United States -- 1-2 (131-153) Identifier: Miocene Document Type: Journal Article Type: Article Accession No: 2220913
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