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Relevant bibliographies by topics / Seismogenic pseudotachylytes

Academic literature on the topic 'Seismogenic pseudotachylytes'

Author: Grafiati

Published: 10 December 2022

Last updated: 28 January 2023

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Journal articles on the topic "Seismogenic pseudotachylytes"

1

Hawemann, Friedrich, Neil S. Mancktelow, Sebastian Wex, Alfredo Camacho, and Giorgio Pennacchioni. "Pseudotachylyte as field evidence for lower-crustal earthquakes during the intracontinental Petermann Orogeny (Musgrave Block, Central Australia)." Solid Earth 9, no. 3 (May 9, 2018): 629–48. http://dx.doi.org/10.5194/se-9-629-2018.

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Abstract. Geophysical evidence for lower continental crustal earthquakes in almost all collisional orogens is in conflict with the widely accepted notion that rocks, under high grade conditions, should flow rather than fracture. Pseudotachylytes are remnants of frictional melts generated during seismic slip and can therefore be used as an indicator of former seismogenic fault zones. The Fregon Subdomain in Central Australia was deformed under dry sub-eclogitic conditions of 600–700 °C and 1.0–1.2 GPa during the intracontinental Petermann Orogeny (ca. 550 Ma) and contains abundant pseudotachylyte. These pseudotachylytes are commonly foliated, recrystallized, and cross-cut by other pseudotachylytes, reflecting repeated generation during ongoing ductile deformation. This interplay is interpreted as evidence for repeated seismic brittle failure and post- to inter-seismic creep under dry lower-crustal conditions. Thermodynamic modelling of the pseudotachylyte bulk composition gives the same PT conditions of shearing as in surrounding mylonites. We conclude that pseudotachylytes in the Fregon Subdomain are a direct analogue of current seismicity in dry lower continental crust.

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2

Young, Erik M., Christie D. Rowe, and James D. Kirkpatrick. "Shear zone evolution and the path of earthquake rupture." Solid Earth 13, no. 10 (October 26, 2022): 1607–29. http://dx.doi.org/10.5194/se-13-1607-2022.

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Abstract. Crustal shear zones generate earthquakes, which are at present unpredictable, but advances in mechanistic understanding of the earthquake cycle offer hope for future advances in earthquake forecasting. Studies of fault zone architecture have the potential to reveal the controls on fault rupture, locking, and reloading that control the temporal and spatial patterns of earthquakes. The Pofadder Shear Zone exposed in the Orange River in South Africa is an ancient, exhumed, paleoseismogenic continental transform which preserves the architecture of the earthquake source near the base of the seismogenic zone. To investigate the controls on earthquake rupture geometries in the seismogenic crust, we produced a high-resolution geologic map of the shear zone core mylonite zone. The core consists of ∼ 1–200 cm, pinch-and-swell layers of mylonites of variable mineralogic composition, reflecting the diversity of regional rock types which were dragged into the shear zone. Our map displays centimetric layers of a unique black ultramylonite along some mylonite interfaces, locally adding to thick composite layers suggesting reactivation or bifurcation. We present a set of criteria for identifying recrystallised pseudotachylytes (preserved earthquake frictional melts) and show that the black ultramylonite is a recrystallised pseudotachylyte, with its distribution representing a map of ancient earthquake rupture surfaces. Pseudotachylytes are most abundant on interfaces between the strongest wall rocks. We find that the geometry of lithologic interfaces which hosted earthquakes differs from interfaces lacking pseudotachylyte at wavelengths of ≳ 10 m. We argue that the pinch-and-swell structure of the mylonitic layering, enhanced by viscosity contrasts between layers of different mineralogy, is expected to generate spatially heterogeneous stress during viscous creep in the shear zone, which dictated the path of earthquake ruptures. The condition of rheologically layered materials causing heterogeneous stresses should be reasonably expected in any major shear zone, is enhanced by creep, and represents the pre-seismic background conditions through which earthquakes nucleate and propagate. This has implications for patterns of earthquake recurrence and explains why some potential geologic surfaces are favored for earthquake rupture over others.

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3

Ferré, Eric C., Joseph L. Allen, and Aiming Lin. "Pseudotachylytes and seismogenic friction: an introduction to current research." Tectonophysics 402, no. 1-4 (June 2005): 1–2. http://dx.doi.org/10.1016/j.tecto.2005.03.013.

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4

O’Hara, Kieran D., and Frank E. Huggins. "A Mössbauer study of pseudotachylytes: redox conditions during seismogenic faulting." Contributions to Mineralogy and Petrology 148, no. 5 (October 28, 2004): 602–14. http://dx.doi.org/10.1007/s00410-004-0622-y.

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5

Morozov, Yu A., M. A. Matveev, A. I. Smulskaya, and A. L. Kulakovskiy. "Two genetic types of pseudotachylytes." Доклады Академии наук 484, no. 5 (May 16, 2019): 589–94. http://dx.doi.org/10.31857/s0869-56524845589-594.

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The study of two varieties of pseudotachylytes (PST) in granitoids of the Riphean complex on the Barents Sea coast of the Kola Peninsula (Rybachii and Srednii peninsulas) and in metapsammite of the Paleoproterozoic complex in the Northern Ladoga region by a few independent analytical methods has made it possible to establish that they belong to different genetic forms, such as mechanically crushed rocks and melting products, respectively. As for the melting differences, we have given a detailed description of the mineral and material transformations of the original rock into the PST glass matrix and obtained evidence for the initial melting out of the micaceous eutectics with its subsequent shift to the granite type. The conclusion has been made on the most likely formation of molten PST due to frictional rock melting under rapid rise of its blocks from a depth of 12–15 km to the crustal surface (less than 3 km) along the faults of presumably seismogenic nature. It is suggested that crushing and frictional melting can be complementary, rather than mutually exclusive processes, and the formation of molten PST is commonly preceded by the mechanical rock crushing stage.

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6

Ujiie, K. "Dynamics of Earthquake Faulting in Subduction Zones: Inference from Pseudotachylytes and Ultracataclasites in an Ancient Accretionary Complex." Scientific Drilling SpecialIssue (November 1, 2007): 92–93. http://dx.doi.org/10.5194/sd-specialissue-92-2007.

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The fault rocks in ancient accretionary complexes exhumed from seismogenic depths may provide an invaluable opportunity to examine the mechanisms and mechanics of seismic slip in subduction thrusts and splay faults. In order to understand the dynamics of earthquake faulting in subduction zones, we analyzed pseudotachylytes and ultracataclasites from the Shimanto accretionary complex in southwest Japan. <br><br> doi:<a href="http://dx.doi.org/10.2204/iodp.sd.s01.21.2007" target="_blank">10.2204/iodp.sd.s01.21.2007</a>

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7

Allanic, C., C. Sue, M. Burkhard, and M. Cosca. "A paleo-seismogenic Lepontine dome? New insights from pseudotachylytes-generating faults." Geochimica et Cosmochimica Acta 70, no. 18 (August 2006): A9. http://dx.doi.org/10.1016/j.gca.2006.06.031.

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8

Karson, Jeffrey A., C. Kent Brooks, Michael Storey, and Malcolm S. Pringle. "Tertiary faulting and pseudotachylytes in the East Greenland volcanic rifted margin: Seismogenic faulting during magmatic construction." Geology 26, no. 1 (1998): 39. http://dx.doi.org/10.1130/0091-7613(1998)026<0039:tfapit>2.3.co;2.

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9

Piccardo, G. B., G. Ranalli, and L. Guarnieri. "Seismogenic Shear Zones in the Lithospheric Mantle: Ultramafic Pseudotachylytes in the Lanzo Peridotite (Western Alps, NW Italy)." Journal of Petrology 51, no. 1-2 (November 6, 2009): 81–100. http://dx.doi.org/10.1093/petrology/egp067.

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10

Kohút, Milan, and Sarah C. Sherlock. "Tracing the Initiation of the Tribeč Mountain Exhumation by Laser-Probe 40Ar/39Ar Dating of Seismogenic Pseudotachylytes (Western Carpathians, Slovakia)." Journal of Geology 124, no. 2 (March 2016): 255–65. http://dx.doi.org/10.1086/684443.

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Dissertations / Theses on the topic "Seismogenic pseudotachylytes"

1

Ueda, Tadamasa. "Seismogenic deformation structures in the brittle-ductile transition regime: a case study of ultramafic pseudotachylytes and related deformed rocks in the Balmuccia peridotite body, Italy." 京都大学 (Kyoto University), 2016. http://hdl.handle.net/2433/204571.

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2

Leib, Susan E. "THERMOBAROMETRY OF METAMORPHOSED PSEUDOTACHYLYTE AND DETERMINATION OF SEISMIC RUPTURE DEPTH DURING DEVONIAN CALEDONIAN EXTENSION, NORTH NORWAY." UKnowledge, 2013. http://uknowledge.uky.edu/ees_etds/9.

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Crustal faulting has long been known as the source of shallow seismicity, and the seismogenic zone is the depth (3-15 km) within the crust that is capable of co-seismic slip, largely under brittle conditions. However, some continental seismicity occurs at depths >> 15 km. I performed thermobarometry of mylonitic pseudotachylyte to determine the P-T of a seismogenic extensional fault in the Caledonian Norwegian margin. Two shear zones (Eidsfjord and Fiskfjord) located in northern Norway exhibit brittle extension propagating into the ductile regime of the lower crust as evidenced by the presence of pseudotachylyte. Averages from Eidsfjord (653 ± 38°C and 570 ± 115 MPa) and Fiskfjord (680 ± 70°C and 1121 ± 219 MPa) correspond to depths of co-seismic slip of 21 ±4 km and 41 ± 9 km, respectively. These depths are 5-25 km below the depth of the standard seismogenic zone in mature fault systems, and require another mechanism (e.g. dynamic downward rupture, unusually high shear stresses) to account for seismogenic rupture at such depths. Assuming Eidsfjord and Fiskfjord were uplifted at the same time, and considering they are currently at the same crustal level, Fiskfjord was uplifted a greater amount and at a faster rate as it was initially located at a greater crustal depth.

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