Dextral strike-slip faulting history of the mid-cretaceous d'abbadie fault zone, Pelly mountains, South-Central Yukon, Canada

AbstractThe Southern Andes are often viewed as a classic example for kinematic partitioning of oblique plate convergence into components of continental margin-parallel strike-slip and transverse shortening. In this regard, the Liquiñe-Ofqui Fault Zone, one of Earth’s most prominent intra-arc deformation zones, is believed to be the most important crustal discontinuity in the Southern Andes taking up margin-parallel dextral strike-slip. Recent structural studies, however, are at odds with this simple concept of kinematic partitioning, due to the presence of margin-oblique and a number of other margin-parallel intra-arc deformation zones. However, knowledge on the extent of such zones in the Southern Andes is still limited. Here, we document traces of prominent structural discontinuities (lineaments) from the Southern Andes between 39° S and 46° S. In combination with compiled low-temperature thermochronology data and interpolation of respective exhumation rates, we revisit the issue of kinematic partitioning in the Southern Andes. Exhumation rates are maximal in the central parts of the orogen and discontinuity traces, trending predominantly N–S, WNW–ESE and NE–SW, are distributed across the entire width of the orogen. Notably, discontinuities coincide spatially with large gradients in Neogene exhumation rates and separate crustal domains characterized by uniform exhumation. Collectively, these relationships point to significant components of vertical displacement on these discontinuities, in addition to horizontal displacements known from published structural studies. Our results agree with previously documented Neogene shortening in the Southern Andes and indicate orogen-scale transpression with maximal vertical extrusion of rocks in the center of the transpression zone. The lineament and thermochronology data call into question the traditional view of kinematic partitioning in the Southern Andes, in which deformation is focused on the Liquiñe-Ofqui Fault Zone.

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Dextral strike-slip of Sanguankou-Niushoushan fault zone and extension of arc tectonic belt in the northeastern margin of the Tibet Plateau

Science China Earth Sciences ◽

10.1007/s11430-016-5272-1 ◽

2016 ◽

Vol 59 (5) ◽

pp. 1025-1040 ◽

Cited By ~ 16

Author(s):

QiYun Lei ◽

PeiZhen Zhang ◽

WenJun Zheng ◽

ChiZhang Chai ◽

WeiTao Wang ◽

...

Keyword(s):

Fault Zone ◽

Strike Slip ◽

Tibet Plateau ◽

Tectonic Belt ◽

Dextral Strike Slip ◽

The Tibet Plateau

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DEXTRAL STRIKE-SLIP OVERPRINT ON THE BYLLESBY-FALLS FAULT ZONE, IRON MOUNTAINS, SOUTHWESTERN VIRGINIA

10.1130/abs/2016am-279919 ◽

2016 ◽

Author(s):

Mitchell R. Scharman ◽

Keyword(s):

Fault Zone ◽

Strike Slip ◽

Dextral Strike Slip

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NEW SURFICIAL GEOLOGIC MAPPING REVEALS CHANGE FROM PLEISTOCENE DEXTRAL STRIKE SLIP TO HOLOCENE TRANSPRESSION ALONG THE SODA-AVAWATZ FAULT ZONE, EASTERN MOJAVE DESERT, CALIFORNIA

10.1130/abs/2016cd-274572 ◽

2016 ◽

Author(s):

Andrew J. Cyr ◽

Keyword(s):

Fault Zone ◽

Mojave Desert ◽

Strike Slip ◽

Geologic Mapping ◽

Dextral Strike Slip

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The Sticklepath-Lustleigh fault zone: Tertiary sinistral reactivation of a Variscan dextral strike-slip fault

Journal of the Geological Society ◽

10.1144/gsjgs.143.3.0447 ◽

1986 ◽

Vol 143 (3) ◽

pp. 447-452 ◽

Cited By ~ 49

Author(s):

S. HOLLOWAY ◽

R. A. CHADWICK

Keyword(s):

Fault Zone ◽

Strike Slip ◽

Strike Slip Fault ◽

Dextral Strike Slip Fault ◽

Dextral Strike Slip

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Tectonics of the Central Part of the Adycha-Taryn Fault Zone (Verkhoyansk-Kolyma Orogenic Belt, NE Asia)

IOP Conference Series Earth and Environmental Science ◽

10.1088/1755-1315/906/1/012109 ◽

2021 ◽

Vol 906 (1) ◽

pp. 012109

Author(s):

D.A. Vasiliev ◽

A.V. Prokopiev ◽

N.N. Ermakov

Keyword(s):

Fault Zone ◽

First Generation ◽

Regional Scale ◽

Strike Slip ◽

Orogenic Belt ◽

Tectonic Structures ◽

Late Mesozoic ◽

Deformation Stage ◽

Fold And Thrust Belt ◽

Dextral Strike Slip

Abstract The study area is located in the central part of the regional-scale Adycha-Taryn fault zone separating the Adycha-El’gi and Nera anticlinoria in the hinterland of the Verkhoyansk fold-and-thrust belt (central part of the Verkhoyansk-Kolyma orogenic belt). Detailed structural studies were conducted in large quarries in the lower reaches of the El’gi River (Indigirka R. basin). In the Adycha-El’gi anticlinorium, several generations of folds, faults, and cleavage are recorded. The intensity of deformation here is found to gradually increase in NE direction. The NE wall of the Adycha-Taryn fault is thought to be more strongly deformed. The results of our investigations revealed three structural parageneses. The first paragenesis includes thrusts, reverse faults, and intense NW-striking folds of the first generation. The second paragenesis consists of less intense superposed folds of the second generation, with subvertical axes, as well as sinistral strike-slip faults. The previously made assumption is confirmed about manifestation in the study area of at least two deformation stages. We also presuppose the existence of the third deformation stage in which dextral strike-slip faults were formed. A change in the intensity of tectonic deformations both along and across the Adycha-Taryn fault zone is first established. On the southwestern side of the fault zone, the intensity of deformation structures decreases from NW to SE. On the northeastern side, the deformation intensity first increases in that same direction but then tends to diminish. An assumption is made about a growing importance of reverse faults in NW direction, along the Adycha-Taryn fault zone. Orientation of paleostress axes responsible for the formation of tectonic structures in the study area is first determined. Folds and thrusts of the first deformation stage were formed under subhorizontal compression in NE direction. Sinistral strike slips and associated folds of the second deformation stage resulted from WE-oriented subhorizontal compression. The following dextral strike-slip motions occurred in the conditions of NW-directed subhorizontal compression and NE-oriented subhorizontal extension. The studied tectonic deformations were formed in Late Mesozoic time as a result of collision-accretion events in the central part of the Verkhoyansk-Kolyma orogenic belt.

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Near-surface Palaeocene fluid flow, mineralisation and faulting at Flamborough Head, UK: new field observations and U-Pb calcite dating constraints

10.5194/se-2020-73 ◽

2020 ◽

Author(s):

Nick M. W. Roberts ◽

Jack K. Lee ◽

Robert E. Holdsworth ◽

Christopher Jeans ◽

Andrew R. Farrant ◽

...

Keyword(s):

Fluid Flow ◽

Fault Zone ◽

Strike Slip ◽

Field Observations ◽

Deformation History ◽

Near Surface ◽

History Of ◽

Tensile Fractures ◽

Compressional Deformation ◽

Slip Motion

Abstract. We present new field observations from Selwicks Bay, NE England, an exposure of the Flamborough Head Fault Zone (FHFZ). We combine these with U-Pb geochronology of syn- to post-tectonic calcite mineralisation to provide absolute constraints on the timing of deformation. The extensional Frontal Fault zone was active at ca. 63 Ma, with protracted fluid activity occurring as young as ca. 55 Ma. Other dated tensile fractures overlap this timeframe, and also cross-cut earlier formed fold structures, providing a lower bracket for the timing of folding and compressional deformation. The Frontal Fault zone acted as a conduit for voluminous fluid flow, linking deeper sedimentary units to the shallow sub-surface, and exhibiting a protracted history of several million years. Most structures at Selwicks Bay may have formed in a deformation history that is simpler than previously interpreted, with a protracted phase of extensional and strike-slip motion along the FHFZ. The timing of this deformation overlaps that of the nearby Cleveland Dyke intrusion and of regional uplift in NW Britain, opening the possibility that extensional deformation and hydrothermal mineralisation at Selwicks Bay are linked to these regional and far-field processes.

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