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  • 1
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    Exhumation of the Dabie Shan ultrahigh-pressure rocks (1996)
    In:  Geowissenschaften, Amsterdam, Elsevier, vol. 14, no. 7-8, pp. 308-309, pp. 2083, (ISBN 1-86239-117-3)
    Details
    Publication Date: 1996
    Keywords: Tectonics ; metamorphic ; China ; scientific drilling ; Geol. aspects
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Diagenesis and fault seismicity of crustal faults (1997)
    In:  J. Geophys. Res., Warszawa, Eötvös Lorand Geophysical Institute of Hungaria, vol. 102, no. B11, pp. 24,459-24,467, pp. 2342, (ISBN: 0534351875, 2nd edition)
    Details
    Publication Date: 1997
    Keywords: Seismicity ; Fault zone ; Mineralogy ; JGR
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    Differential stress, strain rate, and temperatures of mylonitization in the Ruby Mountains, Nevada: implications for the rate and duration of uplift (1990)
    In:  J. Geophys. Res., Warszawa, Eötvös Lorand Geophysical Institute of Hungaria, vol. 95, no. 1, pp. 8569-8580, pp. 2342, (ISBN: 0534351875, 2nd edition)
    Details
    Publication Date: 1990
    Keywords: Stress ; Geothermics ; Geol. aspects ; Tectonics ; JGR
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    BIBLIOGRAPHY SEISMOLOGY
  • 4
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    Timing of synconvergent extension in NW Himalaya: New geochronological constraints from the Gianbul dome (SE Zanskar). The 19th Himalaya-Karakorum-Tibet Workshop (2004)
    In:  Himalayan Journal of Sciences, Special Issue, pp. 232, vol. 2
    Details
    Publication Date: 2004
    Keywords: CC 1/1 ; Coordinating Committee ; Himalayas
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    BIBLIOGRAPHY ILP
  • 5
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    Thermochronology of the Talkeetna intraoceanic arc of Alaska: Ar/Ar, U-Th/He, Sm-Nd, and Lu-Hf dating (2011)
    Wiley
    In: Tectonics
    Details
    Publication Date: 2011-02-26
    Description: As one of two well-exposed intraoceanic arcs, the Talkeetna arc of Alaska affords an opportunity to understand processes deep within arcs. This study reports new Lu-Hf and Sm-Nd garnet ages, 40Ar/39Ar hornblende, mica and whole-rock ages, and U-Th/He zircon and apatite ages from the Chugach Mountains, Talkeetna Mountains, and Alaska Peninsula, which, in conjunction with existing geochronology, constrain the thermal history of the arc. Zircon U-Pb ages establish the main period of arc magmatism as 202–181 Ma in the Chugach Mountains and 183–153 Ma in the eastern Talkeetna Mountains and Alaska Peninsula. Approximately 184 Ma Lu-Hf and ∼182 Ma Sm-Nd garnet ages indicate that 25–35 km deep sections of the arc remained above ∼700°C for as much as 15 Myr. The 40Ar/39Ar hornblende ages are chiefly 194–170 Ma in the Chugach Mountains and 175–150 Ma in the Talkeetna Mountains and Alaska Peninsula but differ from zircon U-Pb ages in the same samples by as little as 0 Myr and as much as 33 Myr, documenting a spatially variable thermal history. Mica ages have a broader distribution, from ∼180 Ma to 130 Ma, suggesting local cooling and/or reheating. The oldest U-Th/He zircon ages are ∼137 to 129 Ma, indicating no Cenozoic regional heating above ∼180°C. Although the signal is likely complicated by Cretaceous and Oligocene postarc magmatism, the aggregate thermochronology record indicates that the thermal history of the Talkeetna arc was spatially variable. One-dimensional finite difference thermal models show that this kind of spatial variability is inherent to intraoceanic arcs with simple construction histories.
    Print ISSN: 0278-7407
    Electronic ISSN: 1944-9194
    Topics: Geosciences
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 6
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    Hot and dry deep crustal xenoliths from tibet (2000)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2000-03-31
    Description: Anhydrous metasedimentary and mafic xenoliths entrained in 3-million-year-old shoshonitic lavas of the central Tibetan Plateau record a thermal gradient reaching about 800 degrees to 1000 degrees C at a depth of 30 to 50 kilometers; just before extraction, these same xenoliths were heated as much as 200 degrees C. Although these rocks show that the central Tibetan crust is hot enough to cause even dehydration melting of mica, the absence of hydrous minerals, and the match of our calculated P-wave speeds and Poisson's ratios with seismological observations, argue against the presence of widespread crustal melting.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hacker -- Gnos -- Ratschbacher -- Grove -- McWilliams -- Sobolev -- Wan -- Zhenhan -- New York, N.Y. -- Science. 2000 Mar 31;287(5462):2463-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Geological Sciences, University of California, Santa Barbara, CA 93106, USA. Mineralogisch-Petrographisches Institut, University of Bern, Baltzerstrasse 1, CH-3012 Bern, Switzerland. Institut fur Geologie, Technische Universitat Bergakademie.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10741961" 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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  • 7
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    Observational evidence for a possible new diffusion path (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-01-04
    Description: Transmission electron microscopy of experimentally deformed amphibolite suggests that submicroscopic intracrystalline tubes formed around linear defects may be a previously unrecognized kind of diffusion pathway. Deformed and compositionally altered plagioclase and amphibole crystals include moderate densities of linear defects that morphologically resemble unit dislocations but display unusual contrast. During prolonged electron irradiation, the core regions of the defects expand to well-defined tubes that are approximately 20 nanometers in diameter. Both observations suggest that the regions about the defect cores are glassy and were filled with silicate-water fluid during the experiments. Intracrystalline transport along these tubes would likely be several orders of magnitude faster than traditionally conceived processes of solid-state volume diffusion, grain-boundary solvent transfer, and ordinary pipe diffusion along dislocation cores.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hacker, B R -- Christie, J M -- New York, N.Y. -- Science. 1991 Jan 4;251(4989):67-70.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17778603" 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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  • 8
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    Time and metamorphic petrology: calcite to aragonite experiments (1992)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1992-10-02
    Description: Although the equilibrium phase relations of many mineral systems are generally well established, the rates of transformations, particularly in polycrystalline rocks, are not. The results of experiments on the calcite to aragonite transformation in polycrystalline marble are different from those for earlier experiments on powdered and single-crystal calcite. The transformation in the polycrystalline samples occurs by different mechanisms, with a different temperature dependence, and at a markedly slower rate. This work demonstrates the importance of kinetic studies on fully dense polycrystalline aggregates for understanding mineralogic phase changes in nature. Extrapolation of these results to geological time scales suggests that transformation of calcite to aragonite does not occur in the absence of volatiles at temperatures below 200 degrees C. Kinetic hindrance is likely to extend to higher temperatures in more complex transformations.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hacker, B R -- Kirby, S H -- Bohlen, S R -- New York, N.Y. -- Science. 1992 Oct 2;258(5079):110-2.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17835893" 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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  • 9
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    Rapid emplacement of young oceanic lithosphere: argon geochronology of the oman ophiolite (1994)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1994-09-09
    Description: (40)Ar/(39)Ar dates of emplacement-related metamorphic rocks beneath the Samail ophiolite in Oman show that cooling to 〈525 degrees C occurred within approximately 1 million years of igneous crystallization of the ophiolite. This unexpectedly short time span and rapid cooling means that old, cold continental or oceanic lithosphere must have been adjacent to the ophiolite during spreading and then been thrust beneath the ophiolite almost immediately afterward.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hacker, B R -- New York, N.Y. -- Science. 1994 Sep 9;265(5178):1563-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17801534" 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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  • 10
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    Global prevalence of double Benioff zones (2007)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2007-06-09
    Description: Double Benioff zones provide opportunities for insight into seismogenesis because the underlying mechanism must explain two layers of deep earthquakes and the separation between them. We characterize layer separation inside subducting plates with a coordinate rotation to calculate the slab-normal distribution of earthquakes. Benchmark tests on well-established examples confirm that layer separation is accurately quantified with global seismicity catalogs alone. Global analysis reveals double Benioff zones in 30 segments, including all 16 subduction zones investigated, with varying subducting plate ages and stress orientations, which implies that they are inherent in subducting plates. Layer separation increases with age and is more consistent with dehydration of antigorite than chlorite.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Brudzinski, Michael R -- Thurber, Clifford H -- Hacker, Bradley R -- Engdahl, E Robert -- New York, N.Y. -- Science. 2007 Jun 8;316(5830):1472-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Geology Department, Miami University, Oxford, OH 45056, USA. brudzimr@muohio.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17556583" 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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