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3 edition of A study of mylonitic rocks from major fault zones found in the catalog.

A study of mylonitic rocks from major fault zones

A study of mylonitic rocks from major fault zones

[annual technical report]

by

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  • 2 Currently reading

Published by U.S. Geological Survey in [Reston, Va.?] .
Written in English

    Subjects:
  • Cataclastic rocks.,
  • Rocks -- Analysis.

  • Edition Notes

    StatementJames R. Anderson.
    SeriesOpen file report -- 80-1154., Open-file report (Geological Survey (U.S.)) -- 80-1154.
    ContributionsGeological Survey (U.S.), State University of New York. Research Foundation.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL17799695M

    One of the largest of the thick‐skinned shear zones is the crustal‐scale Woodroffe Thrust [Major, ], which is well exposed in the central Musgrave Block over km along strike and ~60 km in the direction of thrusting (Figure 2), making it an ideal candidate for studying thrust geometry. The geometry, evolution, and kinematics of the Cited by: 8. intrusions are observed at the footwall of these major low-angle normal faults. Mylonitic to different types of fault rocks with distinct features and special composition. Detailed mapping of the granitic intrusions of NE Tinos island and the enveloping rocks (Fig 2) and study of the magmatic and deformation structures in all scales. Refereed Journal Articles and Book Chapters. West, D.P., Jr., Bradley, D , , Kinematic vorticity analysis and evolving strength of mylonitic shear zones: new data and numerical , Mapping the deeply eroded roots of a major strike-slip fault system: A summary of recent mapping along the Norumbega fault system in Maine. The lozenges were subsequently incorporated into the mylonitic shear zones by lateral branching of fractures from the bounding shear zones and by synthetic rotation of the existing foliation between the fractures and shear zones. In this way, the mylonitic shear zones widened and the deformation became homogeneous on the scale of initial.

    Additionally, a petrographic and paragenetic study of mappable hydrothermal alteration zones associated with different lithotypes and/or structures is used to constrain the character and number of fluid flow events within the supracrustal rocks and attempts to link .


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A study of mylonitic rocks from major fault zones Download PDF EPUB FB2

Study of mylonitic rocks from major fault zones (OCoLC) Microfiche version: Anderson, James R. (James Richard), Study of mylonitic rocks from major fault zones (OCoLC) Material Type: Document, Government publication, National government publication, Internet resource: Document Type: Internet Resource, Computer File.

Study of mylonitic rocks from major fault zones (OCoLC) Online version: Anderson, James R. (James Richard), Study of mylonitic rocks from major fault zones (OCoLC) Material Type: Government publication, National government publication: Document Type: Book: All Authors / Contributors.

Fig. (A) Conceptual 2D model of a major fault zone; (B) photomicrograph (crossed polars, 40 magnifications) depicting a beautiful example of a mylonite from the “brittle-ductile transition” showing both plastic deformation in quartz forming ribbons and frictional sliding in feldspar forming book-shelf sliding microstructure; (C) and (D) the classic outcrop where Lapworth worked in the.

Mylonitic rocks are a type of clastic rock (a rock formed by the breaking or crushing of rock fragments or mineral grains), and they include protomylonites, mylonites, and blastomylonites (Fig.

1) (Higgins, ).A mylonitic rock is a foliated metamorphic rock in which the grains of the parent rock have been reduced in size without the loss of primary A study of mylonitic rocks from major fault zones book.

This is a richly illustrated reference book that provides a unique, comprehensive, and up-to-date survey of the rocks and structures of fault and shear zones. These zones are fundamental geologic structures in the Earth's crust.

Their rigorous analysis is crucial to understanding the Pages: Rocks within these ductile shear zones include variably mylonitic granitic gneiss, metavolcanic gneiss, eclogite and marble with type-A folds, sheath folds, and two generations of folds.

Microstructures, including asymmetric folds, S-C structures, and asymmetric strain shadows, mostly indicate top-NW shear, but in some areas top-SE shear sense. A study of mylonitic rocks from major fault zones book Microfabrics from the Rocks of MCT Zone in Alakhnanda Valley, Garhwal Himalaya Article (PDF Available) in Journal of the Geological Society of India 75(1) February with.

In structural geology, a suture is a joining together along a major fault zone, of separate terranes, tectonic units that have different plate tectonic, metamorphic and paleogeographic histories. The suture is often represented on the surface by an orogen or mountain range. The term was borrowed from surgery where it describes the A study of mylonitic rocks from major fault zones book together of two pieces of tissue, but the sutures of the.

Biju John, in Integrating Disaster Science and Management, Fault Studies from Crystalline Rocks. Faulting in consolidated sedimentary rocks and crystalline rocks produces a variety of fault rocks ranging from mylonite to fault gouge (Scholz, ).A synoptic view of fault rocks with depth and temperature is shown in Fig.

A study of mylonitic rocks from major fault zones book In crystalline terrains, the study of fault rocks. This study presents the first evidence of eo-Alpine W–NW directed normal kinematics along the Schneeberg Normal Fault Zone, which separates eo-Alpine high-pressure rocks in a footwall position.

Exhumation Processes: Normal Faulting, Ductile Flow and Erosion (Geological Society Special Publication) - ISBN The Internal Structure of Fault Zones: Implications for Mechanical & Fluid-Flow Properties - Special Publication no - ISBN The Geological Society of.

Vein Development in Reverse Fault Zones Cox, S. Pages Get Access to Full Text. Progressive mylonitization of arkose along a major thrust fault Gilotti, Jane A.

Pages Get Access to Full Text. Microstructural Development of Mylonitic Rocks of Specific Composition.

Microstructures in Low- and High-Temperature. Examples include the Boulder-Lefroy fault in Western Australia, the Porcupine-Destor and Larder Lake-Cadillac fault zones in the Abitibi belt (Figs.

1 and 2), the Wanipigow and Manigotogan fault zones in the Rice Lake district, Manitoba (Fig. 3), and the McLennan tectonic zone in the La Ronge district, Saskatchewan (Fig. These major high. A study of mylonitic rocks from major fault zones book a study of the Mt. Evans batholith and environs, adjacent to the Idaho Springs-Ralston shear zone on the south (fig.1), the batholith was dated at Ga by the U-Pb zircon method (Aleinikoff and others, ), and mapping showed that it was transected by mylonitic structures of the shear zone.

@article{osti_, title = {Movement sense determination in sheared rocks}, author = {Simpson, C.}, abstractNote = {Deformation within fault zones produces sheared rocks that range from cataclasites at high structural level, to mylonites and mylonitic gneiss at deeper levels.

These rocks are easily recognized and mapped in the field and the strike and dip of the fault zone established. Rocks in major shear zones commonly show evidence of several overprinting stages of activity at different metamorphic conditions since shear zones are eas-ily reactivated.

Fig. 1: Distribution of the main types of fault rocks with depth in the crust. From [6] A special terminology is used for rocks that have been deformed in shear zones, partly.

Abstract. Review of geochronological studies of mylonites and cataclasites indicates that results have been equivocal. For example, mylonites from the Brevard fault zone in the southern Appalachians have been sampled at different locations and dates have been obtained using several techniques: Ma, U-Pb zircon;,Ma, Rb-Sr whole-rock by: 2.

While any fault-related cataclasic/mylonitic fabrics that may have been associated with the Hillabee thrust were erased by Mississippian (ca.

Ma) greenschist-facies metamorphism, map relationships between metasedimentary units in the Talladega Group and internal layering in the Hillabee Greenstone (e.g. metadacites, massive sulfide zones. @article{osti_, title = {Mesozoic contractile and extensional structures in the Boyer Gap area, northern Dome Rock Mountains, Arizona}, author = {Boettcher, S.S.}, abstractNote = {Mesozoic polyphase contractile and superposed ductile extensional structures affect Proterozoic augen gneiss, Paleozoic metasedimentary rocks, and Jurassic granitoids in the Boyer Gap area of the northern.

Summary. Current models of the structure of an active fault zone recognize two important subdivisions — an upper zone, extending to mid-crustal depths, in which processes associated with brittle fracture and friction dominate the fault behaviour, and a lower zone, extending into the mantle, within which stresses may be relieved by ductile by: The Atacama Fault Zone (AFZ) is an extensive system of faults cutting across the Chilean Coastal Cordillera in Northern Chile between the Andean Mountain range and the Pacific Ocean.

The fault system is North-South striking and runs for more than km North and up to 50 km in width through the Andean forearc region. The zone is a direct result of the ongoing subduction of the Eastward.

DYNAMIC METAMORPHISM: Metamorphism associated with fault zones. Low T, P: Incohesive rocks; very complex (gouge, breccia). High T, P: Very cohesive w/strong foliations (cataclasite, mylonite).

Textural Classification of Fault Rocks: INCOHESIVE Fault Rocks • Fault breccias (visible fragments >30% of rock) • Gouge (visible fragments File Size: 45KB. Rocks in California (Figure 1) record a long history of subduction during the Mesozoic and early Cenozoic, followed by strike-slip offsets along the San Andreas fault system during the late Cenozoic.

This Andean-type continental margin (Figure 2) produced an arc-trench system with corresponding arc volcanism, forearc deposition, and subduction.

Mylonites can be found in places call mylonite zones. These zones are located along major fault zones, and can range in lengths of hundreds of kilometers, and can also be several kilometers thick.

MYLONITE, HYALO-A mylonitic rock which has unergone recrystallization and some melting as well with melt cooling down to glassy partices at many places. rocks where vein fill is different from composition of the wall rock.

grain sized reduced rock in shear zones with crystal plastic deformation mechanisms. Gives it a platy appearance and it may contain some porphyroclasts. Structural Geology Part 1 Terms. johnwallx. Structural Geology Terms. raiparfait.

Structural Geology 26 Terms. Figure 1 - Tectonic map of the northeastern Mediterranean showing the major sutures and continental blocks. Sutures are shown by heavy lines with the polarity of the former subduction zones indicated by filled triangles.

Heavy lines with open triangles represent active subduction zones. The book's practical emphasis, hugely popular in the first edition, features applications in the upper crust, including petroleum and groundwater geology, highlighting the importance of structural geology in exploration and exploitation of petroleum and water resources.

(a) Major paleogeographic units of the Western and central Alps, modified after Froitzheim et al. The white box shows the location of the study area.

(b) Geological setting of the study area indicating the major tectonic units and main tectonic lines, as well as the sample by: 9. In response to orogenic cycles, the ductile shear zone records a complex crustal deformation history. In this study, we conducted a microstructural analysis of two NW–SE trending ductile shear zones (Deokjeok Shear Zone (DSZ) and Soya Shear Zone (SSZ)) in the Late Triassic post-collisional granites along the western Gyeonggi Massif in the Korean Peninsula.

Present-day ranges in the region, therefore, represent (1) single huge tilt blocks or series of tilt blocks above the regional detachment fault, (2) uplifted domes of deep-level rocks beneath the warped fault, or (3) untilted fault blocks outside the belt of major extension (Davis et al.,; Howard et al., ; Howard and John, Dear friends of the On-The-Rocks Field Trip Series - Below, for educational interest, we provide an annotated On-The-Rocks field trip listing of all of the localities visited during the decade-long On-The-Rocks Field Trip Series conducted by Drs.

Charles Merguerian and John E. OTR series consisted of forty-two all-day (and some two-day) geological field trips conducted to Speleology. Seismic wave attenuation, Physical properties of rocks, Wave-Induced-Phenomena, Genesis of caves and speleothems, Reservoir characterization, Nuclear waste management.

Estibalitz Ukar Fracture analysis and structural diagenesis Brittle structural petrology Fractured carbonate rocks Tectonics and metamorphism of subduction zones. 3D geological modeling of lithogeochemical and geological data provides insight into the role of the sulfide ore horizon and associated footwall hydrothermal alteration in localizing shear strain in the Flin Flon volcanogenic massive sulfide deposits, Canada, as deformation evolved from brittle-ductile to ductile regimes during collisional stages of the – Ga Trans-Hudson orogeny.

3D Cited by: 2. Orogen-parallel strike-slip faults that develop in the hanging walls of subduction zones (e.g. the Sumatra fault, Fitch ), and in internal part of orogenic zones (e.g. the Insubric fault in the Alps, Lacassin ) result from slip partitioning between thrusting and strike-slip faulting.

Together with shear heating, subduction and/or Cited by: The late brittle fault dislocation produced an en echelon, overlapping complex of at least three broad (up to 30 km wide) zones of intensely mylonitised rocks, represented in Vietnam by the Day Nui Con Voi, Middle Belt and Ailao Shan zones (Burchfiel et al., ).

The Day Nui Con Voi is bounded to the northeast and southwest respectively by. These volcanic rocks are, in turn, unconformably overlain by the Late Cambrian to Early Ordovician molassic Owen Conglomerate.

Two major faults, the NNW-SSE Great Lyell Fault and the NNE trending Henty Fault intersect near the deposit which occurs between the two, south of their confluence. The Great Lyell Fault continues for >30 km south to. the Brevard fault in Georgia, were localized along thrust sheets of the Georgiabama thrust stack.

These granitic rocks show evidence of decompressional melt­ ing and localization along structural discontinuities. Grantandothers()concluded thattheStoneMoun­ tain granitic magma formed as a. Widespread layering and foliation within rocks of the group are cut by Crow ell-Walker: Anorthosite and Related Bocks mylonitic and cataclastic zones in which the rocks have recrystallized.

These zones are distinct from late shears, minor faults, and joints containing incoherent pul- verized rock and gouge, which presumably formed during.

Merguerian, Charles; and Sanders, J. E., a, T Cameron's Line and The Bronx parks, 08 May (revision of T 24 November ): New York Academy of Sciences Section of Geological Sciences Trips on the Rocks Guidebook, p. Michael Cosca is a research geologist with the U.S.

Geological Survey, who combines 40 Ar/ 39 Ar geochronology with mineralogy, petrology, and field geology to understand igneous, metamorphic, and tectonic processes at the regional, local, and sub-grain scale.

Mike received his undergraduate degree in geology from the University of California, Berkeley () and () and Ph.D. The analyses of individual fault zones at terrane boundaries in areas where differ- ential pdf has created structural relief of, say, 10 km or more, should be considered extremely important in establishing probable changes in structural behavior or major faults as they descend into the crust.Petrology, the study of rocks, may sound absurd to some, but it's more practical than it hold the only available record of the history of our one and only planet.

They also hold the key to two of the great pillars of human economy—mineral wealth and agricultural vigor.Variably dipping high-strain thrust zones evolved in the hinge zone of a ebook ESE-WNW trending ebook (Figure 16c), while steep high-strain mylonitic shear zones truncate the limbs of the macro-fold (Figure 17c, d).

Strain partitioning is observed at all scales, and low strain lenses are typically overprinted and transposed into high strain by: