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  • 1
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    A new perspective on paleopiezometry: Dynamically recrystallized grain size distributions indicate mechanism changes (2010)
    GSA (Geological Society of America)
    In:  Geology, 38 (8). pp. 759-762.
    Details
    Publication Date: 2019-10-24
    Description: The dynamically recrystallized grain size is a material parameter associated with dislocation creep of crystalline solids that is especially important as a flow stress indicator via piezometer calibrations. Grain sizes have been measured in many studies of deformed rocks as well as metals and ceramics, but global analyses of the frequency distribution of dynamically recrystallized grain sizes are lacking. Here we present the first systematic investigation of the recrystallized grain size distribution, for quartz. The grain diameters, compiled from 555 samples of 31 studies of quartz mylonites deformed over a wide range of conditions, extend from ∼3 μm to 3 mm, with distinct maxima at 10–20 μm and 70–80 μm, and minima at 35–40 μm and ∼120 μm. The frequency maxima correlate with distinct microstructures and the minima with the transitions between these microstructures, which we interpret to result from the dominance of the recrystallization mechanisms of bulging, subgrain rotation, and grain boundary migration recrystallization. These results demonstrate the necessity of distinct piezometer calibrations for different recrystallization mechanisms and highlight the importance of the recrystallized grain size for theoretical models of dynamic recrystallization.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1130/G31162.1
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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    Splitting a continent : insights from submarine high resolution mapping of the Moresby Seamount detachment, offshore Papua New Guinea (2011)
    GSA (Geological Society of America)
    In:  Geology, 39 (7). pp. 651-654.
    Details
    Publication Date: 2020-10-21
    Description: The Moresby Seamount detachment in the Woodlark Basin (east of Papua New Guinea) is arguably the best exposed active detachment fault in the world. We present the results of a high-resolution autonomous underwater vehicle survey of bathymetry, bottom water temperature, and turbidity. In combination with dredging and existing drillhole data, a synthesis of the tectonic geomorphology, kinematics, and mechanics of the detachment is provided. The detachment surface, which has a 30° northward dip and ∼8 km post-Pliocene displacement, is well preserved. Two major smooth areas are tectonically created, and megascopic (kilometer scale) slickensides indicate downdip direction of movement. The detachment is transected by a major sinistral strike-slip fault, suggesting deformation partitioning in the detachment zone in response to the 500 k.y. change in plate kinematics. The mainly gabbroic protoliths and cataclasites from the fault show pervasive syntectonic alteration, leading to large increases in abundance of quartz and, more important, calcite. Resulting quartz-rich and calcite-rich mylonites play a crucial role, as weak fault rocks and ductile microstructures point to detachment operation at low differential stress. A kilometer-sized anomaly in bottom water temperature and turbidity is found at the downdip end of the detachment zone, indicating that it hosts an active hydrothermal system, probably fed by overpressured fluids from a deep crustal source.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1130/G31931.1
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    Neutron time-of-flight texture measurements in Dubna: Status and developments (2010)
    Universitätsverlag Göttingen
    Details
    Publication Date: 2021-03-29
    Description: The multidetector texture diffractometer SKAT (from Russian: Spektrometer Kolitshestvennovo Analiza Tekstury) at the pulsed reactor IBR-2 in Dubna, Russia, started operation in March 1997 and is open for users from all countries. Application of time-of-flight (TOF) diffraction to texture measurements offers the opportunity to record complete diffraction patterns, i.e., to measure several pole figures simultaneously. To allow high spectral resolution for measurements on polyphase geological samples with many diffraction patterns, the instrument was placed at the end of an over 100m long flight path. In this paper, we will summarize advantages and disadvantages of the SKAT, as well as intended improvements.
    Description: conference
    Keywords: 551 ; VAE 120 ; VGA 440 ; VGB 900 ; VKA 200 ; Methodik {Strukturgeologie} ; Sonstige Methoden {Mineralogie: Kristallographie} ; Sonstige: Luminiszens etc. {Mineralogie} ; Gefügekunde der Gesteine ; Dubna ; SKAT ; Neutronendiffraktrometer ; Neutronendiffraktrometrie ; Texturanalyse
    Language: German
    Type: anthologyArticle , publishedVersion
    Format: application/pdf
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    CITATION GEO-LEO
  • 4
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    Geotechnical characterization of trench- and slope sediments off Southern Chile: preliminary results (2010)
    Universitätsverlag Göttingen
    Details
    Publication Date: 2021-03-29
    Description: To understand seismogenesis in shallow parts of subduction zones, it is vital to know about strength and frictional parameters of subducted sediment. For this purpose, PETROTEC, as part of the TIPTEQ-Project, gathers geotechnical data for sediments deposited on the incoming Nazca Plate, the trench and the slope off the southern Chilean coast during the last 5 Ma, and whose equivalents are now being underthrusted into the seismogenic zone beneath South America. Material comes from gravity cores collected during R/V SONNE Cruises SO181 (Flüh E. & Grevemeyer I (Editors) 2005), SO102 (Hebbeln D, Wefer G, et al. 1995) and SO156 (Hebbeln D, et al. 2001), as well as from ODP Leg 141 (Behrmann JH, et al. 1992) drill cores. Sediment strength and frictional properties are determined by triaxial testing, ring shear testing and direct shear testing...
    Description: conference
    Keywords: 551 ; VAT 210 ; VBP 100 ; VBP 400 ; VAE 130 ; VKB 311 ; Untersuchungsverfahren mariner Sedimente {Geologie} ; Methodik, Untersuchungsverfahren und Instrumente {Ingenieurgeologie} ; Felsmechanik, Gebirgsmechanik, Gebirgsdruck ; Geomechanik ; Untersuchungsmethoden und Probennahme im Gelände {Sedimentologie} ; Chile ; Kontinentalrand ; Konturit ; Gesteinsmechanik
    Language: German
    Type: anthologyArticle , publishedVersion
    Format: application/pdf
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    CITATION GEO-LEO
  • 5
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    Deformation und Kinematik der Lechtal-Decke im nordwestlichen Rätikon, Nördliche Kalkalpen (Vorarlberg,Österreich) (2010)
    Universitätsverlag Göttingen
    Details
    Publication Date: 2021-03-29
    Description: Diese Arbeit beschäftigt sich mit dem strukturellen Bau und der tektonischen Entwicklung der Lechtal-Decke im nordwestlichen Rätikon am Westende der Nördlichen Kalkalpen (NKA). Die Daten und Interpretationen beziehen sich zum Einen auf den gesamten Bereich der NKA im Rätikon westlich des Brandnertals und zum Anderen auf ein detailliert kartiertes Teilgebiet zwischen dem südlichen Brandnertal und dem südlichen Gamperdonatal. In- und außerhalb dieses Kartiergebiets konnten in Aufschlüssen der Arosazone, die das lokale Unterlager der Nördlichen Kalkalpen darstellt, kinematische Daten von Scherbändern erhoben werden. Auf der Basis der eigenen Arbeiten und publizierten Geologischen Karten der Region (Allemann 1985, Heissl 1965) wurde ein NW–SE-Profil durch das westliche Rätikon konstruiert und bilanziert. Die Anlage des Profils erfolgte senkrecht zum Überwiegenden Streichen der Großstrukturen die einen ausgeprägten Schuppen- und Faltenbau zeigen...
    Description: conference
    Keywords: 551 ; VEB 162 ; VAE 811 ; VAE 140 ; VAE 400 ; Nördliche Ostalpen {Geologie} ; Alpidische Orogene {Geologie} ; Gesteinsdeformation {Strukturgeologie} ; Tektogenese {Geologie} ; Lechtal Decke ; Deformation 〈Geologie〉 ; Tektogenese
    Language: German
    Type: anthologyArticle , publishedVersion
    Format: application/pdf
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    CITATION GEO-LEO
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