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  • Geological Society of America (GSA)  (3)
  • Nature Publishing Group  (3)
  • American Association for the Advancement of Science (AAAS)  (2)
  • 1
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    High shear strain of olivine aggregates: rheological and seismic consequences (2000)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2000-11-25
    Description: High-pressure and high-temperature torsion experiments on olivine aggregates in dislocation creep show about 15 to 20% strain weakening before steady-state behavior, characterized by subgrain-rotation recrystallization and a strong lattice preferred orientation. Such weakening may provide a way to focus flow in the upper mantle without a change in deformation mechanism. Flow laws derived from low strain data may not be appropriate for use in modeling high strain regions. In such areas, seismic wave propagation will be anisotropic with an axis of approximate rotational symmetry about the shear direction. In contrast to current thinking, the anisotropy will not indicate the orientation of the shear plane in highly strained, recrystallized olivine-rich rocks.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bystricky, M -- Kunze, K -- Burlini, L -- Burg, J -- New York, N.Y. -- Science. 2000 Nov 24;290(5496):1564-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Geologisches Institut, ETH-Zentrum, 8092 Zurich, Switzerland. misha@erdw.ethz.ch〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11090352" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    Accumulation of D-aspartic acid with age in the human brain (1983)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1983-06-24
    Description: An age-related accumulation of D-aspartic acid was detected in the white matter of ten normal brains from individuals aged 30 to 80 years. Gray matter showed no systematic increase in D-aspartic acid. The rate constant for D-aspartate formation in the brain is equal to the predicted value calculated for 37 degrees C. Accumulation of the uncommon D-aspartate isomer in myelinated white matter implies that there is little or no turnover of this tissue, and this may have a bearing on dysfunction of the aging brain or on other diseases of myelin.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Man, E H -- Sandhouse, M E -- Burg, J -- Fisher, G H -- New York, N.Y. -- Science. 1983 Jun 24;220(4604):1407-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6857259" target="_blank"〉PubMed〈/a〉
    Keywords: Adult ; Aged ; *Aging ; Aspartic Acid/*analysis/physiology ; *Brain Chemistry ; Eye Proteins/analysis ; Humans ; Lens Nucleus, Crystalline/analysis ; Middle Aged
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 3
    Electronic Resource
    Electronic Resource
    Structure and evolution of the Himalaya–Tibet orogenic belt (1984)
    [s.l.] : Nature Publishing Group
    Nature 307 (1984), S. 17-22 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The 1981 French–Chinese expedition to Tibet focused on the Lhasa block, extending earlier coverage 400 km north of the Tsangpo suture. The Lhasa block stood between 10 and 15° N latitude over most of the Upper Cretaceous and Eocene and, if Gondwanian in origin, had detached from Gondwana ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/307017a0
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    The Tibetan side of the India–Eurasia collision (1981)
    [s.l.] : Nature Publishing Group
    Nature 294 (1981), S. 405-410 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Results are reported from the 1980 joint French–Chinese field expedition in Tibet. The area covered was from the High Himalaya in the south, to the region of Nagqu ∼250 km north of Yangbajain. Ophiolites in the Zangbo valley represent remnants of the crust of an ocean basin which lay ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/294405a0
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  • 5
    Electronic Resource
    Electronic Resource
    Tectonics and structural zonation of southern Tibet, China (1984)
    [s.l.] : Nature Publishing Group
    Nature 311 (1984), S. 219-223 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The Yarlung Zangbo suture zone is composed of several thrust sheets with distinct stratigraphies, states of deformation and metamorphic grades. Successive deformations have been produced by persistent north–south shortening since obduction of the ophiolites by late Cretaceous–Palaeocene ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/311219a0
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  • 6
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    Detrital zircon and provenance analysis of Late Cretaceous-Miocene onshore Iranian Makran strata: Implications for the tectonic setting (2016)
    Geological Society of America (GSA)
    Details
    Publication Date: 2016-09-01
    Description: A multidisciplinary provenance study, including sandstone framework, heavy mineral analysis, in situ U-Pb dating of detrital zircon, and Hf isotopic ratio analysis of dated zircons, was undertaken on Late Cretaceous–Miocene deep-marine turbiditic and deltaic sandstones of Makran accretionary wedge, SE Iran, to determine their sedimentary provenance and tectonic setting. Sandstone framework modes reveal both magmatic arc rocks as a source of Late Cretaceous–Oligocene detritus and recycling of Miocene sandstones. Heavy mineral assemblages, Cr-spinel, and blue amphibole indicate ophiolite and high-pressure–low-temperature metamorphic rocks (blueschists) as a supplementary provenance. In total, 2931 laser-ablation–inductively coupled plasma–mass spectrometry (ICP-MS) U-Pb detrital zircon ages on 21 sandstone samples yielded three major age peaks at ca. 167 Ma, 88.7 Ma, and 48.9 Ma. Also, 241 in situ Hf isotope analyses of dated zircons provide evidence for dominantly igneous source rocks. Two main detrital zircon ages are identified: (1) abundant Middle Jurassic grains with Hf isotopic compositions of continental crust, suggesting a rifting-related magmatic provenance; and (2) Late Cretaceous–Eocene grains with Hf isotopic compositions of continental crust and nondepleted mantle, suggesting a continental magmatic arc provenance. This change in provenance is attributed to the Late Cretaceous convergence between Arabia and Eurasia.
    Print ISSN: 0016-7606
    Electronic ISSN: 1943-2674
    Topics: Geosciences
    Published by Geological Society of America (GSA)
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  • 7
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    Detrital zircon and provenance analysis of Eocene-Oligocene strata in the South Sistan suture zone, southeast Iran: Implications for the tectonic setting (2016)
    Geological Society of America (GSA)
    Details
    Publication Date: 2016-11-29
    Description: The north-south–trending Sistan suture zone in east Iran results from the Paleogene collision of the Central Iran block to the west with the Afghan block to the east. We aim to document the tectonic context of the Sistan sedimentary basin and provide critical constraints on the closure time of this part of the Tethys Ocean. We determine the provenance of Eocene–Oligocene deep-marine turbiditic sandstones, describe the sandstone framework, and report on a geochemical and provenance study including laser ablation–inductively coupled plasma–mass spectrometry U-Pb zircon ages and 415 Hf isotopic analyses of 3015 in situ detrital zircons. Sandstone framework compositions reveal a magmatic arc provenance as the main source of detritus. Heavy mineral assemblages and Cr-spinel indicate ultramafic rocks, likely ophiolites, as a subsidiary source. The two main detrital zircon U-Pb age groups are dominated by (1) Late Cretaceous grains with Hf isotopic compositions typical of oceanic crust and depleted mantle, suggesting an intraoceanic island arc provenance, and (2) Eocene grains with Hf isotopic compositions typical of continental crust and nondepleted mantle, suggesting a transitional continental magmatic arc provenance. This change in provenance is attributed to the Paleocene (65–55 Ma) collision between the Afghan plate and an intraoceanic island arc not considered in previous tectonic reconstructions of the Sistan segment of the Alpine-Himalayan orogenic system.
    Print ISSN: 1941-8264
    Electronic ISSN: 1947-4253
    Topics: Geosciences
    Published by Geological Society of America (GSA)
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  • 8
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    Correlation of fluvial terraces and temporal steady-state incision on the onshore Makran accretionary wedge in southeastern Iran: Insight from channel profiles and 10Be exposure dating of strath terraces (2015)
    Geological Society of America (GSA)
    Details
    Publication Date: 2015-03-07
    Description: We describe and summarize the geomorphology of fluvial terraces along the four major rivers draining the central, onshore Makran accretionary wedge in Iran, and describe uplifted marine terraces on the coast of this region. Thirty-five strath terraces at different sites were dated using in situ–produced cosmogenic 10 Be concentrations from surfaces and depth profiles. These new measurements reveal abandonment ages between ca. 15 and 380 ka. The age distribution allows determining the chronology of terrace levels and establishing regional correlations between two major regional levels. The geographically widespread correspondence suggests that these two levels result from a regional, climatically driven force. Systematic dating also provides evidence for time and spatial variations in incision rate, which enables distinguishing between a regionally uniform incision rate of 0.3–0.4 mm/a and higher local incision and/or uplift (~0.8 mm/a) rates. These spatial changes are consistent with where localized tectonic activity is recognized in the field. We also dated, using 14 C in shells, four uplifted marine terraces on the coast of the study area. Comparing incision rates derived from strath terraces (0.3 mm/a) with published uplift estimates from marine terraces (0.2 mm/a) reveals that fluvial rivers responded to a regional, long-term incision and surface uplift pattern. This rate reflects the tectonically steady state of the wedge on a regional scale. Locally high incision rates delineate active faults and folds, indicating that perfect steady state is unlikely on short length scales.
    Print ISSN: 0016-7606
    Electronic ISSN: 1943-2674
    Topics: Geosciences
    Published by Geological Society of America (GSA)
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