By Robert E. Holdsworth
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Extra resources for Continental transpressional and transtensional tectonics
Although linear, margin-parallel zones of high-pressure mineral assemblages presumably formed in subduction zone settings, they are commonly found in areas of collisional belts. Thus, the uplift of high-pressure rocks, and blueschists in particular, is broadly related to collision dynamics (Hsa 1991). Terrane collision would effectively stop subduction and, if oblique, result in transpressional kinematics. As discussed above, transpression zones are effective at uplifting material because of the wrench-induced vertical conduit and the contraction-induced uplift.
Isotopic U-Pb Ages of Zircon from Granitoids of the Central Sierra Nevada, California. US Geological Survey Professional Paper, 1185. STOWELL, H. H. & HOOFER, R. J. 1990. Structural development of the western metamorphic belt adjacent to the Coast Plutonic Complex, southeastern Alaska: evidence from Holkham Bay. Tectonics, 9, 391-407. C. 1993. Intersecting intracontinental transform fault systems in the North American Cordillera. Canadian Journal of Earth Sciences, 30, 1267-1274. TEVSSIER,C. & TIKOFF,B.
Geologists attempting to analyse complex zones of three-dimensional deformation in the Earth's crust are often faced with a level of structural complexity that makes coherent interpretation extremely challenging. To improve our understanding of such zones, mathematical and analogue models have been utilized in which individual parameters that affect deformation can be isolated and varied, and their effect on resultant strain measured. Although all such models are greatly idealized and simplified in comparison with most naturally occurring shear zones, the models can nevertheless be extremely useful in allowing the interplay of variables in complicated 3D strain zones to be visualized, and thereby more easily understood.