Microstructure of Vein Quartz Aggregates as an Indicator of Their Deformation History: An Example of Vein Systems from Western Transbaikalia (Russia)

Dmitry V. Lychagin; Elvira N. Kungulova; Evgeny N. Moskvichev; Anatoly A. Tomilenko; Platon A. Tishin

doi:10.3390/min10100865

Microstructure of Vein Quartz Aggregates as an Indicator of Their Deformation History: An Example of Vein Systems from Western Transbaikalia (Russia)

Minerals ◽

10.3390/min10100865 ◽

2020 ◽

Vol 10 (10) ◽

pp. 865

Author(s):

Dmitry V. Lychagin ◽

Elvira N. Kungulova ◽

Evgeny N. Moskvichev ◽

Anatoly A. Tomilenko ◽

Platon A. Tishin

Keyword(s):

Electron Back Scatter Diffraction ◽

Vein Quartz ◽

Dislocation Glide ◽

Western Transbaikalia ◽

Special Boundaries ◽

Brittle Ductile Transition ◽

Multi Stage ◽

Average Deformation ◽

Stage Development ◽

Quartz Aggregates

We investigated the microstructural and crystallographic features of quartz from complex vein systems associated with the development of thrust and shear deformations in Western Transbaikalia using electron back scatter diffraction (EBSD) and optical microscopy. Vein quartz systems were studied to obtain insights on the mechanisms and localization of strains in quartz, in plastic and semibrittle conditions close to the brittle–ductile transition, and their relationship to the processes of regional deformations. Five types of microstructures of vein quartz were distinguished. We established that the preferred mechanisms of deformation of the studied quartz were dislocation glide and creep at average deformation rates and temperatures of 300–400 °C with subsequent heating and dynamic and static recrystallization. The formation of special boundaries of the Dauphiné twinning type and multiple boundaries with angles of misorientation of 30° and 90° were noted. The distribution of the selected types in the differently oriented veins was analyzed. The presence of three generations of vein quartz was established. Microstructural and crystallographic features of vein quartz aggregates allow us to mark the territory’s multi-stage development (with the formation of syntectonic and post-deformation quartz).

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Son-of-God traditions in the Synoptic Gospels: Ferdinand Hahn's diachronic perspective

HTS Teologiese Studies / Theological Studies ◽

10.4102/hts.v57i1/2.1878 ◽

2001 ◽

Vol 57 (1/2) ◽

Author(s):

Yolanda Dreyer

Keyword(s):

Early Christianity ◽

Synoptic Gospels ◽

Son Of God ◽

Multi Stage ◽

Stage Development ◽

Hellenistic Judaism ◽

Cultural World ◽

Historical Origins

This study makes use of Ferdinand Hahn's insights (with Son of God as case study) to indicate how the naming of Jesus developed in stages. It is shown that the name Son of God was not used by Jesus. It functioned within the context of the cultic activities of early Christianity, was taken over from the surrounding religious, political and cultural world while its referential meaning shifted in the various layers. Hahn focuses on the multi-stage development of the Jesus tradition from an Aramaic "Judaism", through a Hellenistic "Judaism" to a Gaeco-Roman stage. First the possible historical origins of the title Son of God are discussed, after which Hahn's view is taken into consideration.

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Analysis of Intragranular Misorientation Related to Deformation in an Al-Mg-Mn Alloy

Materials Science Forum ◽

10.4028/www.scientific.net/msf.495-497.1049 ◽

2005 ◽

Vol 495-497 ◽

pp. 1049-1054 ◽

Cited By ~ 22

Author(s):

Yoshimasa Takayama ◽

Jerzy A. Szpunar ◽

Hajime Kato

Keyword(s):

Electron Microscope ◽

High Temperature ◽

Room Temperature ◽

Electron Back Scatter Diffraction ◽

High Temperature Deformation ◽

Temperature Deformation ◽

Stored Energy ◽

Kernel Average Misorientation ◽

Dislocation Glide ◽

Scanning Electron

Intragranular misorientation reflects strain generated during deformation with dislocation glide. The SEM/EBSP (scanning electron microscope/ electron back scatter diffraction pattern) technique provides is “kernel average misorientation (KAM)” as the most appropriate quantity to evaluate the strain or the stored energy for a given point. The KAM is defined for a given point as the average misorientation of that point with all of its neighbors. In the present paper two analyses of the intragranular misorientation using the SEM/EBSP technique for a cyclic deformation at room temperature and a high temperature deformation in an Al-Mg-Mn alloy are reviewed.

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Manganoan fayalite and products of its alteration from the Strzegom pegmatites, Poland

Mineralogical Magazine ◽

10.1180/minmag.1989.053.371.07 ◽

1989 ◽

Vol 53 (371) ◽

pp. 315-325 ◽

Cited By ~ 4

Author(s):

J. Janeczek

Keyword(s):

Hydrothermal Alteration ◽

Fluid Inclusions ◽

Iron Hydroxide ◽

Silicate Phase ◽

Second Stage ◽

Multi Stage ◽

Composite Mixture ◽

Quartz Aggregates ◽

Lower Silesia

AbstractNodules of manganoan fayalite occur in schlieren pegmatities in the vicinity of Strzegom, Lower Silesia. The fayalite, Na0.02(Fe1.812+Mn0.16Mg 0.03)Si0.99O4, is unzoned and non pleochroic. 2Va = 42° a 4.826(3), b 10.500(2), c 6.102(2) A, d130obs. = 2.83 Å, d130calc. = 2.833 Å, D = 4.35 g cm-3, Dcalc. = 4.353 g cm-3. The role of Na+ ions in the fayalite chemistry is discussed. The fayalite underwent multi-stage hydrothermal alteration beginning at the highest temperature (440°C) of homogenization of gaseous-fluid inclusions in quartz adjacent to the fayalite grains. Increase in fO2 and then in PH2O resulted in the formation of magnetite-quartz and Mn-grunerite-magnetite-quartz aggregates within the fayalite grains. The fayalite is mantled by a Mn-greenalite-magnetite rim, Mn-grunerite-magnetite-Mn-minnesotaite zone in a stilpnomelane or greenalite-rich groundmass. The minnesotaite is believed to have formed at the expense of grunerite. Stilpnomelane, the most abundant silicate phase in the rim, is the product of biotite and presumably greenalite alteration at the second stage of increasing Na activity (the crystallization of cleavelandite) in the pegmatites. The fayalite is also heavily altered to iddingsite—a composite mixture of amorphous FeOOH and silica. The iron-hydroxide recrystallized partially to poorly-crystalline goethite.

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How low can you go? - Extending downwards the limits of plastic deformation in pyrite

Mineralogical Magazine ◽

10.1180/minmag.2009.073.6.895 ◽

2009 ◽

Vol 73 (6) ◽

pp. 895-913 ◽

Cited By ~ 5

Author(s):

C. D. Barrie ◽

A. P. Boyle ◽

M. Salter

Keyword(s):

Plastic Deformation ◽

Electron Backscatter Diffraction ◽

Ore Deposits ◽

Deformation Mechanisms ◽

Dislocation Glide ◽

Orientation Contrast ◽

Brittle Ductile Transition ◽

History Of ◽

Diffusive Processes ◽

Backscatter Diffraction

AbstractUnderstanding the deformation mechanisms that may operate in pyrite (FeS2) across a range ofP-Tconditions is important in deciphering the history of deformed ore deposits. Pyrite has frequently been considered a hard mineral, which deforms by cataclastic flow or diffusive processes, if at all, at temperatures <425°C. However, utilizing SEM-based orientation-contrast (OC) imaging and electron-backscatter diffraction (EBSD) techniques, plastic deformation can now be readily identified within pyrite grains. In this study, a series of pyrite-rich polymetallic ore deposits, deformed at low temperature metamorphic conditions (∼200—420°C), have been investigated. Results indicate that pyrite grains in all the ore deposits preserve internal lattice ‘distortion’ or ‘bending’ and therefore plastic deformation mechanisms have operated. Many pyrite grains in the ore deposits also contain low-angle (∼2°) sub-grain boundaries or ‘dislocation walls', indicating that both dislocation glide and creep have been the dominant deformation mechanisms at peak metamorphic conditions within the pyrite grains. These results suggest that the brittle-ductile transition in pyrite occurs at temperatures potentially as low as ∼200°C, far lower than implied from previous studies or the current pyrite deformation-mechanism map.

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Multi-stage development of the southern Tibet detachment system near Khula Kangri. New data from Gonto La

Tectonophysics ◽

10.1016/0040-1951(96)00073-x ◽

1996 ◽

Vol 260 (1-3) ◽

pp. 1-19 ◽

Cited By ~ 70

Author(s):

Michael A. Edwards ◽

William S.F. Kidd ◽

Jixiang Li ◽

Yongjun Yue ◽

Marin Clark

Keyword(s):

Southern Tibet ◽

Multi Stage ◽

Stage Development

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Service Consumption in Higher Institution Management: Scale Development

Journal of Educational and Social Research ◽

10.2478/jesr-2019-0051 ◽

2019 ◽

Vol 9 (4) ◽

pp. 27-34

Author(s):

Ogheneovie Michael Ezebor ◽

Olaleke Oluseye Ogunnaike ◽

Ugonna Joshua Ikpeazu ◽

Oluwatosin Folaranmi ◽

Ogechi Gloria Obidinma ◽

...

Keyword(s):

Factor Analysis ◽

Scale Development ◽

Positive Response ◽

Service Encounter ◽

Validity And Reliability ◽

Multi Stage ◽

Higher Institution ◽

Stage Process ◽

Stage Development ◽

Survey Questionnaires

Abstract This research provides a reconceptualization of service consumption in higher institution. It made use of a multi-stage development scale process, where survey questionnaires were issued out to 50 respondents which include students of Covenant University (B.Sc., M.Sc./MBA). The result of the exploratory and factor analysis shows the multi-stage process. The study showed an evidence of validity and reliability of the scales used. Findings showed that the institution had a positive response to the pre-purchase and service encounter stages while most respondents frowned at the post encounter stage, the institution should put more effort in post encounter stage so as to get a positive response in the nearest future.

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Bayesian reliability assessment of repairable systems during multi-stage development programs

IIE Transactions ◽

10.1080/07408170500232602 ◽

2005 ◽

Vol 37 (11) ◽

pp. 1071-1081 ◽

Cited By ~ 8

Author(s):

Maurizio Guida ◽

Gianpaolo Pulcini

Keyword(s):

Reliability Assessment ◽

Development Programs ◽

Repairable Systems ◽

Multi Stage ◽

Stage Development

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The Microstructure and Mechanical Properties of Directionally Solidified NiAl-15Cr Alloy at Various Temperatures

Materials Science Forum ◽

10.4028/www.scientific.net/msf.475-479.2623 ◽

2005 ◽

Vol 475-479 ◽

pp. 2623-2626

Author(s):

Guang Ye Zhang ◽

Jian Ting Guo ◽

Lan Zhang Zhou ◽

Gu Song Li ◽

Heng Qiang Ye

Keyword(s):

Mechanical Properties ◽

Strain Rate ◽

Strain Softening ◽

Tensile Elongation ◽

Initial Strain Rate ◽

Initial Strain ◽

Directionally Solidified ◽

Dislocation Glide ◽

Brittle Ductile Transition ◽

Nial Phase

The microstructure and tensile mechanical properties of directionally Solidified NiAl-15Cr alloy at various temperatures have been investigated in this paper. The results reveal that the microstructure consists of dendritic β-NiAl phase, interdendritic γ/γ’, γ’ phase transient layer and α-Cr precipitation in β-NiAl phase. With the increase of temperature obvious Brittle-Ductile-Transition (BDT) behavior is observed and the BDT temperature (BDTT) is sensitive to initial strain rate. When the initial strain rate increases by two-order magnitude, the BDTT has an approximate 150K increase. In the temperature range of 1123-1373K, the alloy exhibits good tensile plasticity and poor strength comparing with the NiAl/Cr(Mo,Hf) alloy. Superplastic-like deformation behavior with large elongation (exceed 200%) is achieved at 1323K. The balance between strain hardening (by dislocation glide) and strain softening (dynamic recover and recrystallization) is responsible for the large tensile elongation of this alloy.

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Grain Boundary Character Distributions of Strain-Annealed 304 Stainless Steel

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.26-28.1335 ◽

2007 ◽

Vol 26-28 ◽

pp. 1335-1340

Author(s):

Xiao Ying Fang ◽

Xin Zhang ◽

Hong Guo ◽

Wei Guo Wang ◽

Bang Xin Zhou

Keyword(s):

Stainless Steel ◽

Grain Boundary ◽

Electron Back Scatter Diffraction ◽

304 Stainless Steel ◽

Boundary Character ◽

Special Boundaries ◽

Grain Boundary Character ◽

Long Time ◽

High Fraction ◽

Type 304

Grain boundary character distributions (GBCD) of type 304 stainless steel cold rolled and then annealed at 1173K were analyzed by electron back scatter diffraction (EBSD). The results showed that low strain (~6%) followed by long-time annealing (96h) resulted in a GBCD containing a high fraction of Σ9 and Σ27 boundaries. The connectivity of general high angle grain boundary (HAB) network was interrupted significantly by Σ3n(n=1,2,3) boundaries(special boundaries).

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