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Timothy Byrne – One of the best experts on this subject based on the ideXlab platform.

  • tectonic evolution of an active tectonostratigraphic boundary in accretionary wedge an example from the tulungwan chaochou fault system southern taiwan
    Journal of Structural Geology, 2014
    Co-Authors: C Huang, Timothy Byrne

    Abstract:

    Abstract The Tulungwan-Chaochou Fault system in southern Taiwan represents the boundary between a slate belt of moderate metamorphic grade and a relatively unmetamorphosed fold-and-thrust belt. The offset between hanging wall and footwall of this fault ranges from 7 to 11 km and is considered one of the major tectonostratigraphic faults in Taiwan. This 75-km-long fault system is also one of the most conspicuous topographic features in Taiwan. The geometry, kinematic history and associated subsidiary structures have not been resolved. Field mapping of fabrics and brittle faults show that a 45-km-long west-northwest-vergent Antiform defined by folded slaty cleavage exists in the hanging wall of the fault. This Antiform has not been previously described and apparently formed in a brittle environment. The flat crest and tight forelimb of the Antiform suggests a two-stage deformation model composed of a fault-bend fold followed by a trishear fold. We infer that regional scale fold is associated with a thrust that splays upward from the main detachment.

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C Huang – One of the best experts on this subject based on the ideXlab platform.

  • tectonic evolution of an active tectonostratigraphic boundary in accretionary wedge an example from the tulungwan chaochou fault system southern taiwan
    Journal of Structural Geology, 2014
    Co-Authors: C Huang, Timothy Byrne

    Abstract:

    Abstract The Tulungwan-Chaochou Fault system in southern Taiwan represents the boundary between a slate belt of moderate metamorphic grade and a relatively unmetamorphosed fold-and-thrust belt. The offset between hanging wall and footwall of this fault ranges from 7 to 11 km and is considered one of the major tectonostratigraphic faults in Taiwan. This 75-km-long fault system is also one of the most conspicuous topographic features in Taiwan. The geometry, kinematic history and associated subsidiary structures have not been resolved. Field mapping of fabrics and brittle faults show that a 45-km-long west-northwest-vergent Antiform defined by folded slaty cleavage exists in the hanging wall of the fault. This Antiform has not been previously described and apparently formed in a brittle environment. The flat crest and tight forelimb of the Antiform suggests a two-stage deformation model composed of a fault-bend fold followed by a trishear fold. We infer that regional scale fold is associated with a thrust that splays upward from the main detachment.

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K L Daughtry – One of the best experts on this subject based on the ideXlab platform.

  • U–Pb constraints on the thermotectonic evolution of the Vernon Antiform and the age of the Aberdeen gneiss complex, southeastern Canadian Cordillera
    Canadian Journal of Earth Sciences, 2006
    Co-Authors: P Glombick, R I Thompson, Philippe Erdmer, Larry M. Heaman, Richard M. Friedman, M. Villeneuve, K L Daughtry

    Abstract:

    The Aberdeen gneiss complex is composed of complexly deformed migmatitic orthogneiss and paragneiss situated within the core of the Vernon Antiform, a structure defined by a series of subparallel reflectors visible at upper to middle crustal depths (6–18 km) in seismic reflection data from the Vernon area of the Shuswap metamorphic complex. The Vernon Antiform and the Aberdeen gneiss complex lie within the footwall of the gently west dipping (top to the west) Kalamalka Lake shear zone. Migmatitic gneiss exposed within the Antiform records evidence (recorded as age domains in complexly zoned zircon grains) of three metamorphic events, occurring at 155–150, 90, and 66–51 Ma. The timing of magmatic events within the Antiform includes emplacement of diorite at ∼232 Ma, tonalite at ∼151 Ma, granodiorite at 102 Ma, and monzonite at 52 Ma. Middle to Late Jurassic metamorphism resulted in widespread migmatization. Early Tertiary metamorphism (66–51 Ma) was coeval with the emplacement of granitic rocks and exhumation typical of other areas of the Shuswap metamorphic complex. Highly deformed orthogneiss situated within the hanging wall of the Kalamalka Lake shear zone, comprising the superstructure, was emplaced at ∼171 Ma. Ductile deformation had ceased by 162 Ma. The complex metamorphic and magmatic evolution of the Vernon Antiform, which is similar to other areas of the southern Canadian Cordillera including the Nicola horst, Mount Lytton – Eagle plutonic complex, Cariboo Mountains, and Mica Creek area, may reflect episodic tectonic activity at the plate margin.

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  • u pb constraints on the thermotectonic evolution of the vernon Antiform and the age of the aberdeen gneiss complex southeastern canadian cordillera
    Canadian Journal of Earth Sciences, 2006
    Co-Authors: P Glombick, R I Thompson, Philippe Erdmer, Larry M. Heaman, Richard M. Friedman, M. Villeneuve, K L Daughtry

    Abstract:

    The Aberdeen gneiss complex is composed of complexly deformed migmatitic orthogneiss and paragneiss situated within the core of the Vernon Antiform, a structure defined by a series of subparallel reflectors visible at upper to middle crustal depths (6–18 km) in seismic reflection data from the Vernon area of the Shuswap metamorphic complex. The Vernon Antiform and the Aberdeen gneiss complex lie within the footwall of the gently west dipping (top to the west) Kalamalka Lake shear zone. Migmatitic gneiss exposed within the Antiform records evidence (recorded as age domains in complexly zoned zircon grains) of three metamorphic events, occurring at 155–150, 90, and 66–51 Ma. The timing of magmatic events within the Antiform includes emplacement of diorite at ∼232 Ma, tonalite at ∼151 Ma, granodiorite at 102 Ma, and monzonite at 52 Ma. Middle to Late Jurassic metamorphism resulted in widespread migmatization. Early Tertiary metamorphism (66–51 Ma) was coeval with the emplacement of granitic rocks and exhumation typical of other areas of the Shuswap metamorphic complex. Highly deformed orthogneiss situated within the hanging wall of the Kalamalka Lake shear zone, comprising the superstructure, was emplaced at ∼171 Ma. Ductile deformation had ceased by 162 Ma. The complex metamorphic and magmatic evolution of the Vernon Antiform, which is similar to other areas of the southern Canadian Cordillera including the Nicola horst, Mount Lytton – Eagle plutonic complex, Cariboo Mountains, and Mica Creek area, may reflect episodic tectonic activity at the plate margin.

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