Numerical Method for Dynamic Analysis of Calcite Twin Lamellae

Spang, John H.

doi:10.1130/0016-7606(1972)83[467:nmfdao]2.0.co;2

Cited by 135 publications

(91 citation statements)

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“…D253b biotite, from the faulted western edge of the Dawu dome (Figure 13), yielded a disturbed spectrum for which we adopt the total fusion age of 84 Ma. The two thermal events are best recorded by potassium feldspar, which indicates initial cooling prior to 90 Ma and reheating and cooling at -75 Ma; these thermal events are accompanied by the two stages of deformation (dextral shear and sinistral faulting; see also Table 3 and Webbet al we obtained stress axes by the "pressure-tension (P-B-T) axes" method [Turner, 1953] and calculated stress tensors by the "numerical dynamic analysis" of Spang [1972] and the "grid search" technique of Hardcastle [1989]. In addition to stress orientation the computation of the reduced stress tensor determines the ratio R, which expresses the relationship between the magnitudes of the principal stresses.…”

Section: Southern and Eastern Dabie Forelandmentioning

confidence: 99%

Exhumation of the ultrahigh‐pressure continental crust in east central China: Cretaceous and Cenozoic unroofing and the Tan‐Lu fault

Ratschbacher¹,

Hacker²,

Webb³

et al. 2000

J. Geophys. Res.

364

275

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Section: Southern and Eastern Dabie Forelandmentioning

confidence: 99%

Exhumation of the ultrahigh‐pressure continental crust in east central China: Cretaceous and Cenozoic unroofing and the Tan‐Lu fault

Ratschbacher¹,

Hacker²,

Webb³

et al. 2000

J. Geophys. Res.

364

275

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“…Sorting of the datasets was done manually to have good control on the selection of faults. For calculations of the stress-tensors we used the P-T-method (Turner 1953) and checked and compared the results with both the NDA (Spang 1972) and right-dihedra (Angelier and Mechler 1977) methods. For every shear plane a contraction (P-axis) and an extension axis (T-axis) is constructed on an auxiliary plane perpendicular to the shear plane and parallel to the slip direction (Online Resource 1).…”

Section: Fault-slip Analysis On Fracturesmentioning

confidence: 99%

The structural history of the Mont Blanc massif with regard to models for its recent exhumation

Egli

Mancktelow

2013

Swiss J Geosci

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The tectonic evolution of the Mont Blanc range with regard to its cooling and exhumation history has been discussed and debated over many years and is still controversial. Recently, several low-temperature thermochronology studies have determined the cooling history of the massif in considerable detail and various tectonic models proposed to explain the young and fast exhumation signal established from these studies. Here we present detailed field data from the wider Mont Blanc area and assess possible exhumation processes in terms of these field constraints. Our observations indicate that none of the major faults or shear zones around the Mont Blanc massif (i.e. Mont Blanc shear zone, Mont Blanc back-thrust, Penninic thrust) was active in Late Neogene times and that young exhumation is therefore not controlled by movements along these structures. We demonstrate that the position of Mont Blanc in the bend of the western Alps plays an important role in its tectonic history and that simple 2D models are insufficient to explain its evolution. Interference between NW-SE compression and orogenparallel extension along the Rhône-Simplon fault system resulted in a complex regional structural pattern, with strike-slip movements on both sides of the Mont Blanc massif. Young brittle faults are predominantly strike slip without significant vertical offset. The young (\2 Ma) rapid exhumation of Mont Blanc is more broadly distributed and cannot be directly linked to discrete faults bounding the massif. The mechanisms driving this recent accelerated exhumation must similarly be of broader scale.

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“…Fibrous crystals observed on fault planes in the study area are dominantly quartz in granitic rocks and calcite in andesitic rocks, occasionally chlorite and iron-oxides/-hydroxides occur. For all kind of fault kinematic data visualization, processing, and analysis, the computer program TectonicsFP by F. Reiter and P. Acs (TectonicsFP: A computer program for structural geology, 2000, available at http:// www.tectonicsfp.com) applying the numeric dynamic analysis method of Spang [1972] has been used (Figures 3e -3i). …”

Section: B5 Fault Kinematic Analysismentioning

confidence: 99%

Kinematic constraints on intra‐arc shear and strain partitioning in the southern Andes between 38°S and 42°S latitude

2006

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[1] On the basis of structural field work, fault kinematic analysis, and the analysis of digital imagery, we describe the northern part of the southern Andean intra-arc Liquiñe-Ofqui Fault Zone (LOFZ) as an SC-like fault zone system accommodating part of the Nazca-South American plate convergence obliquity. Kinematic modeling suggests that the LOFZ accommodated 124 (+24/À21) km of dextral displacement between 40°S and 42°S and 67 (+13/À11) km between 38°S and 40°S since the Pliocene. Associated vertical axis rotations are 31 ± 4°c lockwise and 9 ± 1°counterclockwise along synthetic and antithetic faults, respectively. Mean Pliocene to recent shear rates along the LOFZ decrease northward from 32 ± 6 mm/yr to 13 ± 3 mm/yr compatible with partitioning of half of the convergence obliquity into the intra-arc zone north of 40°S and complete partitioning to the south. The displacement gradient along the intra-arc zone results in margin-parallel shortening of the fore arc.

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Numerical Method for Dynamic Analysis of Calcite Twin Lamellae

Cited by 135 publications

References 0 publications

Exhumation of the ultrahigh‐pressure continental crust in east central China: Cretaceous and Cenozoic unroofing and the Tan‐Lu fault

Exhumation of the ultrahigh‐pressure continental crust in east central China: Cretaceous and Cenozoic unroofing and the Tan‐Lu fault

The structural history of the Mont Blanc massif with regard to models for its recent exhumation

Kinematic constraints on intra‐arc shear and strain partitioning in the southern Andes between 38°S and 42°S latitude

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