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Journal Article
Journal: Geosphere
Published: 25 September 2017
Geosphere (2017) 13 (6): 1949-1972.
...Deborah Shulman; Christopher Gerbi; Jeffrey Marsh; Martin Yates; Nicholas Culshaw AbstractObservations of physical and chemical changes across strain gradients can provide information about the processes that lead to localization and therefore provide better tools for prediction of spatial...
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Journal Article
Journal: Lithosphere
Published: 09 August 2017
Lithosphere (2017) 9 (5): 828-850.
... and eastward-striking faults. Fracture sets and previously published calcite-twin strain data show more complex patterns related to evolving stress-strain fields, from pre-Laramide (intraplate) west-northwest–east-southeast compression, to early Laramide west-southwest–east-northeast LPS, to later Laramide...
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Journal Article
Journal: Geosphere
Published: 09 August 2017
Geosphere (2017) 13 (5): 1566-1609.
..., strains from the Laramide orogeny through Rio Grande rifting. Normal faults within Tertiary basin-fill sediments are consistent with more typical WNW-ESE Rio Grande rift extension, perhaps decoupled from bedrock structures due to strength contrasts favoring the formation of new faults in the relatively...
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Journal Article
Journal: Lithosphere
Published: 14 July 2017
Lithosphere (2017) 9 (5): 774-795.
..., finite strain, and shear-sense data from an 11-km-thick structural transect through the Dang Chu region. Raman spectroscopy on carbonaceous material and garnet-biotite thermometry define a gradual, structurally upward decrease from 600–700 °C to 400–500 °C, and structural data indicate pure shear...
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Series: Geological Society, London, Special Publications
Published: 01 January 2016
DOI: 10.1144/SP431.9
EISBN: 9781862399631
... different equilibrium surface heat flows and lower-crustal rheologies are studied. Modelling results indicate that substantial parts of the lower crust at transform margins have the potential to flow at geologically appreciable strain rates, which can lead to uplift/subsidence, as well as lateral variations...
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Series: Geological Society, London, Special Publications
Published: 01 January 2015
DOI: 10.1144/SP421.10
EISBN: 9781862399549
... and stretched continental crust is coincident with the long-lived left-lateral ‘West Shetland Shear Zone’, which partitioned strain during rifting of the margin. 2D/2.5D gravity and magnetic models are shown for two seismic profiles from the PGS FSB MegaSurveyPlus. The models suggest highly thinned crust, which...
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Series: Geological Society, London, Special Publications
Published: 01 January 2015
DOI: 10.1144/SP421.9
EISBN: 9781862399549
... The Chalk is significantly thinner above the diapir than on its flanks. We interpret a component of this thinning to be due to strains associated with the mechanical emplacement of the salt, but given the time-frame outlined by Megson (1992) , it would seem reasonable that some of the thinning...
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Series: GSA Memoirs
Published: 01 January 2015
DOI: 10.1130/2015.1212(19)
Series: GSA Special Papers
Published: 01 January 2015
DOI: 10.1130/2014.2509(07)
... excursion increased with felt intensity, independent of epicentral distance. Coseismic static strain from the earthquake was too small and localized to have contributed significantly to the groundwater-level offsets. The relation with intensity is consistent with ground motion from seismic waves leading...
Series: GSA Special Papers
Published: 01 January 2015
DOI: 10.1130/2014.2509(19)
..., in the epicentral area, and has led to revision of the position and surface trace of the Chopawamsic fault. Both these features are considered to have no connection to the 2011 event. Ductile strain features in a previously unrecognized zone related to the Long Branch fault are considered with a simple analysis...
Series: GSA Field Guide
Published: 01 January 2015
DOI: 10.1130/2015.0040(06)
EISBN: 9780813756400
... quartzites and Catoctin basalt—that forms the high linear backbone of the “Blue Ridge” at these latitudes (Fig. 5 ). Regional Paleozoic faults also cut and duplicate elements of the anticlinorium in the region of this field trip. The Rock-fish Valley high-strain zone (Fig. 5 ) is an ~1- to 6-km-wide...
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Series: GSA Special Papers
Published: 01 August 2014
DOI: 10.1130/2014.2507(01)
Series: GSA Field Guide
Published: 01 January 2014
DOI: 10.1130/2014.0034(04)
EISBN: 9780813756349
... a broadly dextral transpres- sive regime ( Tikoff and Greene, 1997 ; Schweickert and Lahren, 1993 ; Sharp et al., 2000 ; Tobisch et al., 2000 ). Deformation involves a complex interplay between rigid rotation of strati- graphic units, internal ductile strain of these units and the plutons that intruded...
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... of the lower Mount Rogers Formation nonconformably overlie Mesoproterozoic basement in the northeasternmost Razor Ridge volcanic center, but the basal contact in parts of the Mount Rogers and Pond Mountain volcanic centers is strongly tectonized and consistent with a NW-directed, greenschist-facies high-strain...
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Series: GSA Special Papers
Published: 01 October 2013
DOI: 10.1130/2013.2499(01)
... For more than two decades, the paradigm of large-magnitude (~250 km), northwest-directed (~N70°W) Neogene extensional lengthening between the Colorado Plateau and Sierra Nevada at the approximate latitude of Las Vegas has remained largely unchallenged, as has the notion that the strain...
Series: GSA Special Papers
Published: 01 October 2013
DOI: 10.1130/2013.2499(02)
... is field geologic evidence of the contribution of karsting and tilting on multiple fixed axes to the Miocene strain history. Together with newly recognized strike slip on northerly striking faults, associated steep-axis bending, and evidence against fault listricity, the region probably contributes little...
Series: GSA Special Papers
Published: 01 September 2013
DOI: 10.1130/2013.2500(11)
... into continental rifting-to-rupture processes is to quantify the time and length scales of faulting and magmatism that produce the time-averaged rift structures imaged in active, failed rifts and passive margins worldwide. We compare and contrast seismic and geodetic strain patterns during discrete, intense...
Series: GSA Special Papers
Published: 01 April 2013
DOI: 10.1130/2013.2494(07)
... demonstrate that under orthogonal extension and an overall plane-strain deformation, relay zones may evolve in a three-dimensional strain field and along non-coaxial strain paths. The extent of non-plane strain and non-coaxial deformation depends on the fault overlap to spacing ratio, the relative...
Series: GSA Special Papers
Published: 01 April 2013
DOI: 10.1130/2013.2494(08)
... fault during ca. 8–11 Ma, resulting in lower strain rates on the Santa Clara fault. East of the Embudo–Santa Clara–Pajarito fault system, deformation of the southern Barrancos monocline and the Cañada Ancha graben peaked during the early–middle Miocene and effectively ceased by the late Pliocene...
Series: GSA Special Papers
Published: 01 April 2013
DOI: 10.1130/2013.2494(14)
... The structural geometry of transfer and accommodation zones that relay strain between extensional domains in rifted crust has been addressed in many studies over the past 30 years. However, details of the kinematics of deformation and related stress changes within these zones have received...