Recent crustal movements in the Central Sierra Nevada—Walker lane region of California—Nevada: Part ii, The pyramid lake right-slip fault zone segment of the Walker lane

Bell, E.J.; Slemmons, David B.

doi:10.1016/0040-1951(79)90272-5

Cited by 13 publications

(6 citation statements)

References 10 publications

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“…Here, the primary master fault of the basin-and-range system extends along the coastline and separates smaller islets and peninsulas of Upper Coralline Limestone from Gozo, composed mainly of Lower Coralline Limestone. These features might be interpreted as conjugate Riedel elements (Bell and Slemmons, 1979), a specific attribute of low-rate shear zones. 7).…”

Section: The C O M I N O C H a N N E L S : T R A N S F O R M F A U L mentioning

confidence: 99%

Graben Formation — the Maltese Islands — a Case History

Illies

1981

Mechanism of Graben Formation

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A B S T R A C T lilies, J.H., 1981. Graben formation -the Maltese Islands -a case history. In: J.H. Ulies (Editor), Mechanism of Graben Formation. Tectonophysics, 73:151-168.The structural setting of the Maltese Islands is governed by two rift systems of different ages and trends and the interference of both. Accompanying faults are exposed at many places along cliffs and belong to the most spectacular phenomena of rift faulting of the world.Malta is part of a wide shelf bridge that connects the Ragusa platform of southern Sicily and the Tripolitanian platform of northern Libya. The archipelago is underlain by a continental crust of African provenance. The older rift generation traversing the islands strikes about 50° to 70° to create a basin-and-range structure on western Malta, Comino and eastern Gozo. This micro-province is framed by two master faults at an average distance of 14 km. Crustal extension started during the Early Miocene, as observed by growth faulting and sedimentary dikes parallel to the future rift. A syndepositional uparching of about 200 m has preceded the physiographical rifting in post-Middle Miocene times. Discrete dip-slip faulting created an external wedge block, split by internal tilt blocks of antithetic character, both compensating an average 15% crustal spreading normal to the rift axis. Shoulder upwarping of approximately 120 m has evolved synchronously with the rifting.Structures of the first generation are crosscut by still active, second-generation rift faults, which on Malta strike about 120°, but on Gozo between 80° and 90°. These faults are associated with the Pantelleria rift, whose deep trough sets immediately south of the islands. Rifting was mainly originated during Late Miocene/Early Pliocene time to continue in parts up to the Present. A set of transform faults runs through the straits on both sides of Comino to form a complicated en echelon or Riedel shear structure on easternmost Gozo and westernmost Malta. Shoulder upwarping related to the Pantelleria rift has considerably tilted the block of Malta NNE-ward and caused the inundated river valleys of the natural harbour of Valletta.The superimposition of two rift structures of different trends has been caused principally by a rotation of the controlling stress regime about 10 m.y. ago. The active A f r o -Eurasian collision front is located about 200 km north and northwest of the islands. A contemporary change of plate tectonic stresses is discussed to explain the intraplate rift pattern on Malta as foreland-specific reactions to plate tectonic processes.

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Section: The C O M I N O C H a N N E L S : T R A N S F O R M F A U L mentioning

confidence: 99%

Graben Formation — the Maltese Islands — a Case History

Illies

1981

Mechanism of Graben Formation

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“…The Walker Lane belt (Figure 1) is bounded on the northeast by the Walker Lane itself (a narrow linear zone passing near Fallon and Gabbs) and on the southwest by the Sierra Nevada front (roughly defined by a line trending N30°W through Lake Tahoe). Deformation in the Walker Lane belt between 39° and 40°N has been described in consecutive papers by Slemmons et al [1979], Bell and Slemmons [1979], and Sanders and Slemmons [1979]. The CNSZ [ Caskey et al , 1996] is defined by the ruptures associated with the 1915 Pleasant Valley, 1954 Rainbow Mountain‐Fairview Peak‐Dixie Valley, and the 1932 Cedar Mountain earthquakes, all magnitude ∼7 events [ Goter et al , 1994].…”

Section: Introductionmentioning

confidence: 99%

Strain accumulation and rotation in western Nevada, 1993–2000

Svarc

2002

J. Geophys. Res.

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[1] The positions of 44 GPS monuments in an array extending from the Sierra Nevada at the latitude of Reno to near Austin, Nevada, have been measured several times in the 1993 -2000 interval. The western half of the array spans the Walker Lane belt, whereas the eastern half spans the central Nevada seismic zone (CNSZ). The principal strain rates in the Walker Lane belt are 29.6 ± 5.3 nstrain yr À1 N88.4°E ± 5.4°and À12.8 ± 6.0 nanostrain yr À1 N01.6°W ± 5.4°, extension reckoned positive, and the clockwise (as seen from above the Earth) rotation rate about a vertical axis is 13.6 ± 4.0 nrad yr À1 . The quoted uncertainties are standard deviations. The motion in the Walker Lane belt can then be represented by a zone striking N35°W subject to 16.8 ± 4.9 nstrain yr À1 extension perpendicular to it and 19.5 ± 4.0 nstrain yr À1 right-lateral, simple shear across it. The N35°W strike of the zone is the same as the direction of the local tangent to the small circle drawn about the Pacific-North America pole of rotation. The principal strain rates for the CNSZ are 46.2 ± 11.0 nstrain yr À1 N49.9°W ± 6.0°and À13.6 ± 6.1 nstrain yr À1 N40.1°E ± 6.0°, and the clockwise rotation rate about a vertical axis is 20.3 ± 6.3 nrad yr À1 . The motion across the CNSZ can then be represented by a zone striking N12°E subject to 32.6 ± 11.0 nstrain yr À1 extension perpendicular to it and 25.1 ± 6.3 nstrain yr À1 right-lateral, simple shear across it. The N12°E strike of the zone is similar to the strikes of the faults (Rainbow Mountain, Fairview Peak, and Dixie Valley) within it.

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“…The Pyramid Lake domain, at the northern end of the Walker Lane belt, displays five major northwest-striking dextral faults, with normal faults present in the western part of the domain (e.g., Bell and Slemmons, 1979;Bell, 1984;Faulds et al, 2005). The timing of initiation of dextral faulting is more recent in the Pyramid Lake domain than in the Walker Lake domain (e.g., Stewart, 1993), suggesting northward growth of the dextral system with time (e.g., Faulds et al, 2005).…”

Section: Structural Domains Of the Central And Northern Walker Lanementioning

confidence: 99%

Modern strain localization in the central Walker Lane, western United States: Implications for the evolution of intraplate deformation in transtensional settings

Surpless

2008

Tectonophysics

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Recent crustal movements in the Central Sierra Nevada—Walker lane region of California—Nevada: Part ii, The pyramid lake right-slip fault zone segment of the Walker lane

Cited by 13 publications

References 10 publications

Graben Formation — the Maltese Islands — a Case History

Graben Formation — the Maltese Islands — a Case History

Strain accumulation and rotation in western Nevada, 1993–2000

Modern strain localization in the central Walker Lane, western United States: Implications for the evolution of intraplate deformation in transtensional settings

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