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| Titel |
Middle Devonian hornblende granite of the Imjingang Belt in South Korea: SHRIMP U-Pb zircon age and its implication on the depositional age of the Imjingang Belt |
| VerfasserIn |
Hyeoncheol Kim, Kenji Horie, Yoonsup Kim, Weon-Seo Kee, Ian S. Williams, Hiroshi Hidaka |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250074036
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| Zusammenfassung |
| The Yeoncheon Group, comprising the major part of the Imjingang belt in central Korean
peninsula, is composed mainly of stratigraphically the lower Misan Formation, consisting of
calc-silicates rocks alternating with pelitic schists, quartzite, marble and amphibolite, and the
upper Daegwangri Formation, consisting of metapelites with rare intercalation of
hornblende-bearing siliceous layers. The hornblende granite locally intrudes the lower part of
the calc-silicate rocks. Pegmatite veins intrude both calc-silicate rocks and hornblende
granite. All these rocks are strongly deformed during the Triassic collision orogeny to have
the same geometry of structural elements. The granite is highly strained mylonite with
isoclinal and sheath folds, and mineral stretching lineation parallel to the fold axis. On the
other hand, competent pegmatite veins are deformed to have lens-shaped boudin structure.
Shear criteria in mylonitized granite indicate the top-to-the-east sense of movement.
Alkali-feldspar porphyroclasts ( |
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