Relationship between polarity of extensional fault arrays and presence of detachments

Stewart, Simon; Argent, John

doi:10.1016/s0191-8141(00)00004-3

Cited by 38 publications

(23 citation statements)

References 40 publications

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“…Increased structural depth in this direction is also supported by changes in the style of deformation, with predominantly ductile fabrics in the east through to accommodation by brittle fracturing and dike emplacement in the west Stewart and Argent, 2000).…”

Section: Geology Of the Northern Sacramento Mountainsmentioning

confidence: 95%

Late-stage evolution of the Chemehuevi and Sacramento detachment faults from apatite (U-Th)/He thermochronometry--Evidence for mid-Miocene accelerated slip

Carter

Kohn

Foster

et al. 2006

Geological Society of America Bulletin

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The unique low-temperature sensitivity of the apatite (U-Th)/He (AHe) technique provides valuable new information relating to the late-stage thermal evolution of metamorphic core complexes in the southern Basin and Range Province. In all the ranges studied, the data show greater complexity than previously seen from other thermochronometers. In the Chemehuevi and northern Sacramento Mountains, a trend of decreasing ages toward the northeast applies only for the structurally shallowest parts of the footwall. This is followed by essentially age-invariant segments of 15 ± 1 Ma, refl ecting an increase in the rate of detachment fault movement. The timing of the change suggested by the data agrees with recently published AHe results from the nearby Harcuvar Mountains, located ~125 km to the southeast, suggesting that an underlying regional mechanism triggered this change. Plate reconstructions indicate that the Pioneer-Mendocino fracture zone migrated northward through the area at this time, leaving a slab window in its wake. We suggest that the additional heat applied to the base of the lithosphere from the slab window resulted in mechanical weakening of the area and that this, combined with the extensional strain regime present, resulted in an increased rate of slip within the actively extending metamorphic core complexes. This agrees well with timing constraints for extension onset in the central Basin and Range Province of southern Nevada, and suggests that weakening of the southern Basin and Range Province at 15 ± 1 Ma was partially responsible for the onset of extension in the central Basin and Range. These fi ndings demonstrate that improved constraints on changes in extension rate within the Basin and Range Province should be possible through the application of the AHe technique to other metamorphic core complex footwalls.Keywords: metamorphic core complexes, Basin and Range Province, low-angle normal faults, (U-Th)/He, low-temperature thermochronology.

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Section: Geology Of the Northern Sacramento Mountainsmentioning

confidence: 95%

Late-stage evolution of the Chemehuevi and Sacramento detachment faults from apatite (U-Th)/He thermochronometry--Evidence for mid-Miocene accelerated slip

Carter

Kohn

Foster

et al. 2006

Geological Society of America Bulletin

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“…This information provides fundamental reconstruction constraints to the progressive evolution of the extensional fault populations. By analyzing the polarity of fault arrays in relation to regional detachment faults, Stewart and Argent (2000) concluded that the presence of an underlying detachment clearly favors fault systems, which are synthetic to the underlying detachment. If these conclusions are applied here, the geometry of the early stages of rifting in Calabria was controlled by regional, ductile-to-brittle, top-tothe-W simple shear extension, which has been previously recognized as responsible for attenuation of the orogenic crustal section (Rossetti et al, 2001.…”

Section: Structural Architecture Of the Crati Basinmentioning

confidence: 98%

“…The depositional architecture at the hanging walls of these low-angle extensional fault systems was infl uenced by synthetic (sensu Stewart and Argent, 2000) extensional domino faulting. This information provides fundamental reconstruction constraints to the progressive evolution of the extensional fault populations.…”

Section: Structural Architecture Of the Crati Basinmentioning

confidence: 99%

“…Shallow-crustal-level studies on the growth and propagation of extensional fault systems, utilizing synrift stratigraphy, have demonstrated that normal fault segmentation and linkage occur during normal fault population evolution in the brittle crust (Gawthorpe et al, 2003;Young et al, 2001). Synrift sedimentation is also strongly sensitive to the style (full or half graben geometries) and internal kinematics of the boundary fault systems, especially when high-and low-angle fault systems contribute to crustal extension (Morley, 1989;Stewart and Argent, 2000). In such a scenario, the integration of structural and paleomagnetic investigations would provide insight into the directions controlling stretching in the upper crust and to constrain the early stages of deformation accompanying sediment deposition.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The architecture of brittle postorogenic extension: Results from an integrated structural and paleomagnetic study in north Calabria (southern Italy)

Cifelli

Rossetti

Mattei

2007

Geological Society of America Bulletin

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An integrated structural and paleomagnetic study was carried out on NeogeneQuaternary clastic sedimentary sequences exposed in north Calabria to defi ne the brittle postorogenic evolution of the inner sector of the Calabrian arc. The structural, mineralogical, and magnetic fabric data presented in this paper suggest that the postorogenic basins of north Calabria originated and developed under an extensional tectonic regime that has been active since the middle Miocene. Results were used to defi ne the spatial and temporal evolution of the extensional fault systems in the framework of extensional processes active in the backarc region of the southeastward-migrating Apennine subduction system. Our data indicate that regional backarc extension operated in the brittle crust, and the data trace a continuous evolution from low-to high-angle extensional faulting. Paleomagnetic data show that this continuous extensional process was accompanied by complex interactions among faultbounded crustal blocks. In fact, the extensional domain is subdivided into different structural compartments, separated by the adjustment in the fault strike imposed by the regional rotation pattern.

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“…If the proposed faults beneath Indian and Piseco Lakes have a component of sinistral displacement and merge with a dextral Prospect fault, then perhaps the Piseco graben formed in the extension region of a strike-slip domino structure (e.g. Kelly et al, 1999;Steward and Argent, 2000). Rigid clock-wise rotation of the blocks would produce small sinistral displacement between blocks, and the intersection region would experience extension.…”

Section: Discussionmentioning

confidence: 98%

Applications of water-based magnetic gradiometry to assess the geometry and displacement for concealed faults in the southern Adirondack Mountains, New York, U.S.A

Valentino

Chiarenzelli

Hewitt³

et al. 2012

Journal of Applied Geophysics

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Relationship between polarity of extensional fault arrays and presence of detachments

Cited by 38 publications

References 40 publications

Late-stage evolution of the Chemehuevi and Sacramento detachment faults from apatite (U-Th)/He thermochronometry--Evidence for mid-Miocene accelerated slip

Late-stage evolution of the Chemehuevi and Sacramento detachment faults from apatite (U-Th)/He thermochronometry--Evidence for mid-Miocene accelerated slip

The architecture of brittle postorogenic extension: Results from an integrated structural and paleomagnetic study in north Calabria (southern Italy)

Applications of water-based magnetic gradiometry to assess the geometry and displacement for concealed faults in the southern Adirondack Mountains, New York, U.S.A

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