Significance of systematic changes in crenulation asymmetries within metasediments across the Ogcheon Supergroup in the Goesan area, southern Korea

Lee, Hyun–Woo

doi:10.1007/bf02910132

Cited by 12 publications

(6 citation statements)

References 34 publications

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“…Examples of consistency in the orientation of porphyroblast Si foliations across large areas were noted from many regions (Otago schists in New Zealand: Johnson 1990; Lys-Caillaouas Massif, Pyrenees: Aerden 1994; Cordillera Betica in Spain, Bell et al 1995; Quinlin orogen in China, Bell and Chen 2002). Furthermore, the classical irotationall spiral or snowball inclusion trail geometries in porphyroblasts can also be modeled by non-rotation (Bell et al 1992a, b, c;Aerden 1994;Lee 2000), or both rotation and non rotation (Ilg and Karlstrom 2000) of porphyroblasts relative to geographical co-ordinance with multiple truncations. With the development of FIA technique, numerous FIA data had been collected along the Appalachians Hickey and Bell 1999;Kim 2000;Newman 2001;Stallard 1999;Yeh 2002), Alps (Bell et al 1995), and Goesan belts, South Korea (Lee 2000 Regions within the northern Appalachians (Vermont, Massachusetts and Connecticut) indicated the FIA succession that resulted from the Acadian orogeny.…”

Section: Rotation Vs Non-rotation Of Porphyroblastsmentioning

confidence: 96%

“…Furthermore, the classical irotationall spiral or snowball inclusion trail geometries in porphyroblasts can also be modeled by non-rotation (Bell et al 1992a, b, c;Aerden 1994;Lee 2000), or both rotation and non rotation (Ilg and Karlstrom 2000) of porphyroblasts relative to geographical co-ordinance with multiple truncations. With the development of FIA technique, numerous FIA data had been collected along the Appalachians Hickey and Bell 1999;Kim 2000;Newman 2001;Stallard 1999;Yeh 2002), Alps (Bell et al 1995), and Goesan belts, South Korea (Lee 2000 Regions within the northern Appalachians (Vermont, Massachusetts and Connecticut) indicated the FIA succession that resulted from the Acadian orogeny. Regions within central and southern Appalachians (Maryland and Georgia) indicated the FIA succession that resulted from the Taconian orogeny with an Acadian overprint.…”

Section: Rotation Vs Non-rotation Of Porphyroblastsmentioning

confidence: 99%

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

Yeh¹

2003

Terr. Atmos. Ocean. Sci.

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An increasing number of structural and metamorphic studies through out the past sixty years have shown the importance of using porphyroblast microstructures to gain further understanding of deformation and meta morphic history and mechanisms. A recent very significant advance has been the development of techniques for the measurement of Foliation In tersection/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 tec tonic history. The FIA technique determines the orientation of or the axis of curvature of a foliation effected by an overprinting event, or the inter section lineation between successive foliations, preserved as inclusion trails within porphyroblasts. Because the axis is determined completely indepen dent 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 defor mation 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 direc tion of relative plate motion within ancient orogens, and (3) the role of rota tion versus non-rotation of porphyroblasts relative to geographical coordi nates during deformation have also been raised.(

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Section: Rotation Vs Non-rotation Of Porphyroblastsmentioning

confidence: 96%

Section: Rotation Vs Non-rotation Of Porphyroblastsmentioning

confidence: 99%

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

Yeh¹

2003

Terr. Atmos. Ocean. Sci.

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“… (a) Structural development of metamorphic rocks and granite emplacement events during the Jurassic to Cretaceous in a cross‐section of the Jeungpyeong–Deokpyeong area, central Okcheon Metamorphic Belt (OMB) (adapted from Lee 2000). A vertical collapse (→) rotates foliations and other fabrics into shallow orientation, pushing rocks laterally towards the orogen edges.…”

Section: Age Determination and Implicationmentioning

confidence: 99%

“…Recently, Lee (2000), using foliation inflexion–intersection axis (FIA) data in garnet porphyroblasts within metasediments, described structural disturbances during regional emplacement of Jurassic granites across the Jeungpyeong–Deokpyeong area in the central OMB (Fig. 7a).…”

Section: Relationship Between Age Structural Development and Jurassimentioning

confidence: 99%

Tectono‐metamorphic evolution of the Okcheon Metamorphic Belt, South Korea: Tectonic implications in East Asia

Kim

Ryu

et al. 2004

Island Arc

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The tectonic history of the Okcheon Metamorphic Belt (OMB) is a key to understanding the tectonic relationship between South Korea, China and Japan. The petrochemistry of 150 psammitic rocks in the OMB indicates that the depositional environment progressively deepened towards the northwest. These data, combined with the distribution pattern of oxide minerals and the abundance of carbonaceous material, support a halfgraben basin model for the OMB. Biotite and muscovite K-Ar dates from metasediments in the central OMB range from 102 to 277 Ma. K-Ar ages of 142-194 Ma are widespread throughout the area, whereas the older ages of 216-277 Ma are restricted to the metasediments of the middle part of the central OMB. The younger (Cretaceous) ages are only found in metasediments that are situated near the Cretaceous granite intrusions. The 216-277 Ma dates from weakly deformed areas represent cooling ages of M1 intermediate pressure/temperature (P/T) metamorphism. The relationship between age distribution and deformation pattern indicates that the Jurassic muscovite and biotite dates can be interpreted as complete resetting ages, caused by thermal and deformational activities associated with Jurassic granite plutonism. Well-defined 40 Ar/ 39 Ar plateau ages of 155-169 Ma for micas from both metasediments and granitic rocks can be correlated with the main Jurassic K-Ar mica ages . U-Pb zircon dates for biotite granite from the southwest OMB are 167-169 Ma. On the basis of the predominantly Jurassic igneous and metamorphic ages and the uniformity of d 002 values for carbonaceous materials in the study area, it is suggested that the OMB has undergone amphibolite facies M2 metamorphism after M1 metamorphism. This low P/T M2 regional thermal metamorphism may have been caused by the regional intrusion of Jurassic granites. The OMB may have undergone tectono-metamorphic evolution as follows: (i) the OMB was initiated as an intraplate rift in the Neoproterozoic during break-up of Rodinia, and may represent the extension of Huanan aulacogen within the South China block; (ii) sedimentation continued from the Neoproterozoic to the Ordovician, perhaps with several unconformities; (iii) M1 intermediate P/T metamorphism occurred during the Late Paleozoic due to compression caused by collision between the North and South China blocks in an area peripheral to the collision zone; and (iv) during the Early to Middle Jurassic, north-westward subduction of the Farallon-Izanagi Plate under the Asian Plate resulted in widespread intrusion of granites, which triggered M2 low P/T regional thermal metamorphism in the OMB. This event also formed the dextral Honam shear zone at the boundary between the OMB and Precambrian Yeongnam massif. Key words: d 002 values for carbonaceous material, intraplate rifting, M1 intermediate pressure/temperature metamorphism, M2 low pressure/temperature regional thermal metamorphism, Okcheon Metamorphic Belt.

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“…Research involving measurement of FIAs, or the pitches of truncational portions of foliations that define the spiral trails, has always revealed that spiral inclusion trail development was directly associated with multiple deformations (e.g. Hayward, 1992;Johnson, 1992;Bell & Mares, 1999;Hickey & Bell, 1999;Lee, 1999Lee, , 2000Stallard, 1999;Kim, 2000Kim, , 2001Newman, 2001;Stallard & Hickey, 2001a,b). The concept that spiral inclusion trails only form in shear zones is not supported by quantitative data from naturally deformed rocks.…”

Section: Formation Of Spiral-shaped Inclusion Trails During Foldingmentioning

confidence: 99%

The development of spiral‐shaped inclusion trails during multiple metamorphism and folding

Bell

Chen

2002

Journal Metamorphic Geology

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Three periods of mineral growth and three generations of spiral‐shaped inclusion trails have been distinguished within folded rocks of the Qinling‐Dabie Orogen, China, using the development of three successive and differently trending sets of foliation intersection axes preserved in porphyroblasts (FIAs). This progression is revealed by the consistent relative sequence of changes in FIA trends from the core to rim of garnet porphyroblasts in samples with multiple FIAs. The first and second formed sets of FIAs trend oblique to the axial planes of macroscopic folds that dominate the outcrop pattern in this region. The porphyroblasts containing these FIAs grew prior to the development of the macroscopic folds, yet the FIAs do not change orientation across the fold hinges. The youngest formed FIAs (set 3) lie subparallel to the axial planes of these folds and the porphyroblasts containing these FIAs formed in part as the folds developed. The deformation associated with all three generations of spiral‐shaped inclusion trails in garnet porphyroblasts involved the formation of subhorizontal and subvertical foliations against porphyroblast rims accompanied by periods of garnet growth; pervasive structures have not necessarily formed in the matrix away from the porphyroblasts. The macroscopic folds are heterogeneously strained from limb to limb, doubly plunging and have moderately dipping axial planes. The consistent orientation of Set 1 FIAs indicates that the development of spiral‐shaped inclusion trails in porphyroblasts with FIAs belonging to Set 2 did not involve rotation of the previously formed porphyroblasts. The consistent orientation of Sets 1 and 2 FIAs indicate that the development of spiral‐shaped inclusion trails in porphyroblasts with FIAs belonging to Set 3 did not involve rotation of the previously formed porphyroblasts during folding. This requires a fold mechanism of progressive bulk inhomogeneous shortening and demonstrates that spiral‐shaped inclusion trails can form outside of shear zones.

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Significance of systematic changes in crenulation asymmetries within metasediments across the Ogcheon Supergroup in the Goesan area, southern Korea

Cited by 12 publications

References 34 publications

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

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

Tectono‐metamorphic evolution of the Okcheon Metamorphic Belt, South Korea: Tectonic implications in East Asia

The development of spiral‐shaped inclusion trails during multiple metamorphism and folding

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