The Significance and Application of Foliation Intersection/ Inflection Axes (FIA) within Porphyroblasts: A review

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Abstract

An increasing number of structural and metamorphic studies throughout the past sixty years have shown the importance of using porphyroblast microstructures to gain further understanding of deformation and metamorphic history and mechanisms. A recent very significant advance has been the development of techniques for the measurement of Foliation Intersection/ Inflection Axes (FIAs) preserved within porphyroblasts. FIAs provide a quantitative method of microstructural analysis that enables the direct linkage and integration of the deformation, metamorphic and tectonic history. The FIA technique determines the orientation of or the axis of curvature of a foliation effected by an overprinting event, or the intersection lineation between successive foliations, preserved as inclusion trails within porphyroblasts. Because the axis is determined completely independent of the model of formation of these included foliations, it allows such models to be thoroughly tested. The method involves three-dimensional examination of microstructures within porphyroblasts in several vertically orientated thin sections that fan around the compass and which have been cut from spatially orientated samples. FIA measurements allow reconstruction, correlation and dating of regional and large-scale deformation and metamorphic histories. Such reconstructions of the tectonic evolution had been conducted in several orogenies around the world. New insights include (1) the intimate control of deformation partitioning on metamorphic reactions, (2) a possible technique for determining the direction of relative plate motion within ancient orogens, and (3) the role of rotation versus non-rotation of porphyroblasts relative to geographical coordinates during deformation have also been raised.
Original languageEnglish
Pages (from-to)401-419
Number of pages19
JournalTerrestrial, Atmospheric and Oceanic Sciences
Volume14
Issue number4
Publication statusPublished - 2003

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porphyroblast
foliation
microstructure
history
overprinting
plate motion
lineation
thin section
tectonic evolution
curvature
partitioning
tectonics

Keywords

  • FIA
  • Microstructure
  • Foliation
  • Porphyroblast

Cite this

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title = "The Significance and Application of Foliation Intersection/ Inflection Axes (FIA) within Porphyroblasts: A review",
abstract = "An increasing number of structural and metamorphic studies throughout the past sixty years have shown the importance of using porphyroblast microstructures to gain further understanding of deformation and metamorphic history and mechanisms. A recent very significant advance has been the development of techniques for the measurement of Foliation Intersection/ Inflection Axes (FIAs) preserved within porphyroblasts. FIAs provide a quantitative method of microstructural analysis that enables the direct linkage and integration of the deformation, metamorphic and tectonic history. The FIA technique determines the orientation of or the axis of curvature of a foliation effected by an overprinting event, or the intersection lineation between successive foliations, preserved as inclusion trails within porphyroblasts. Because the axis is determined completely independent of the model of formation of these included foliations, it allows such models to be thoroughly tested. The method involves three-dimensional examination of microstructures within porphyroblasts in several vertically orientated thin sections that fan around the compass and which have been cut from spatially orientated samples. FIA measurements allow reconstruction, correlation and dating of regional and large-scale deformation and metamorphic histories. Such reconstructions of the tectonic evolution had been conducted in several orogenies around the world. New insights include (1) the intimate control of deformation partitioning on metamorphic reactions, (2) a possible technique for determining the direction of relative plate motion within ancient orogens, and (3) the role of rotation versus non-rotation of porphyroblasts relative to geographical coordinates during deformation have also been raised.",
keywords = "FIA, Microstructure, Foliation, Porphyroblast",
author = "葉, {孟宛(Meng-Wan Yeh)}",
year = "2003",
language = "English",
volume = "14",
pages = "401--419",
journal = "Terrestrial, Atmospheric and Oceanic Sciences",
issn = "1017-0839",
publisher = "中華民國地球科學學會",
number = "4",

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TY - JOUR

T1 - The Significance and Application of Foliation Intersection/ Inflection Axes (FIA) within Porphyroblasts: A review

AU - 葉, 孟宛(Meng-Wan Yeh)

PY - 2003

Y1 - 2003

N2 - An increasing number of structural and metamorphic studies throughout the past sixty years have shown the importance of using porphyroblast microstructures to gain further understanding of deformation and metamorphic history and mechanisms. A recent very significant advance has been the development of techniques for the measurement of Foliation Intersection/ Inflection Axes (FIAs) preserved within porphyroblasts. FIAs provide a quantitative method of microstructural analysis that enables the direct linkage and integration of the deformation, metamorphic and tectonic history. The FIA technique determines the orientation of or the axis of curvature of a foliation effected by an overprinting event, or the intersection lineation between successive foliations, preserved as inclusion trails within porphyroblasts. Because the axis is determined completely independent of the model of formation of these included foliations, it allows such models to be thoroughly tested. The method involves three-dimensional examination of microstructures within porphyroblasts in several vertically orientated thin sections that fan around the compass and which have been cut from spatially orientated samples. FIA measurements allow reconstruction, correlation and dating of regional and large-scale deformation and metamorphic histories. Such reconstructions of the tectonic evolution had been conducted in several orogenies around the world. New insights include (1) the intimate control of deformation partitioning on metamorphic reactions, (2) a possible technique for determining the direction of relative plate motion within ancient orogens, and (3) the role of rotation versus non-rotation of porphyroblasts relative to geographical coordinates during deformation have also been raised.

AB - An increasing number of structural and metamorphic studies throughout the past sixty years have shown the importance of using porphyroblast microstructures to gain further understanding of deformation and metamorphic history and mechanisms. A recent very significant advance has been the development of techniques for the measurement of Foliation Intersection/ Inflection Axes (FIAs) preserved within porphyroblasts. FIAs provide a quantitative method of microstructural analysis that enables the direct linkage and integration of the deformation, metamorphic and tectonic history. The FIA technique determines the orientation of or the axis of curvature of a foliation effected by an overprinting event, or the intersection lineation between successive foliations, preserved as inclusion trails within porphyroblasts. Because the axis is determined completely independent of the model of formation of these included foliations, it allows such models to be thoroughly tested. The method involves three-dimensional examination of microstructures within porphyroblasts in several vertically orientated thin sections that fan around the compass and which have been cut from spatially orientated samples. FIA measurements allow reconstruction, correlation and dating of regional and large-scale deformation and metamorphic histories. Such reconstructions of the tectonic evolution had been conducted in several orogenies around the world. New insights include (1) the intimate control of deformation partitioning on metamorphic reactions, (2) a possible technique for determining the direction of relative plate motion within ancient orogens, and (3) the role of rotation versus non-rotation of porphyroblasts relative to geographical coordinates during deformation have also been raised.

KW - FIA

KW - Microstructure

KW - Foliation

KW - Porphyroblast

M3 - Article

VL - 14

SP - 401

EP - 419

JO - Terrestrial, Atmospheric and Oceanic Sciences

JF - Terrestrial, Atmospheric and Oceanic Sciences

SN - 1017-0839

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