Geosciences Journal

  • 제10권4호
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  • Pages.369-389
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  • 2006
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  • 1226-4806(pISSN)
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  • 1598-7477(eISSN)
한국지질과학협의회 (The Association of Korean Geoscience Societies)
권호 표지

Sequence stratigraphy of Pyeongan Supergroup (Carboniferous-Permian), Taebaek area, mideast Korea

Lee, Hyun-Suk;Chough, Sung-Kwun

  • 발행 : 20060000
⟨ 이전 논문 다음 논문 ⟩

초록

This study focuses on the sequence stratigraphy of the Pyeongan Supergroup (Carboniferous-Permian), central-eastern Korea. The supergroup consists of about 1700-m-thick siliciclastic deposits, disconformably overlying the Joseon Supergroup(Cambro-Ordovician). The entire succession is represented by thirteen sedimentary facies which can be organized into seven facies associations (FAs) and, in turn, three sequence units. Sequence 1 constitutes FAs 1, 2, 3, and 4. FA 1 consists of conglomerate, sandstone and shale facies, and is bounded by a sequence boundary (SB 1) at the base. The overlying purple siltstone with interbedded massive sandstone and carbonate grainstone (FA 2) formed on a coastal plain during sea-level rise, which is transitional upward into black shale and patchy bioturbated carbonate packstone (FA 3) of lagoonal environments. The transition from FA 1 to 3 represents relative sea-level rise with small-scale fluctuations, i.e., transgressive systems tract. FA 4 consists of cross-stratified conglomerate and massive sandstone with black shale which prograded over lagoonal area, forming highstand systems tract (HST). Sequence 2 consists of FAs 5 and 6. Sequence boundary (SB 2) occurs at the transition between FAs 4 and 5. FA 5 is characterized by crossstratified coarse sandstone and purple fine sandstone to siltstone of fluvial plain environments. It represents rapid change in depositional environments from shoreface to fluvial system. FA 6 comprises upward-fining units (massive sandstone to dark gray siltstone), suggestive of restricted bay environments during relative sea-level rise. Due to an abrupt fall in sea level, the basin was closed with thick fluvial deposits (FA7). Sequence 3 comprises planar and trough cross-stratified coarse sandstone and partly bioturbated purple fine sandstone to mudstone (FA 7). The entire succession represents deposition of a second order cycle of sea-level rise and fall during the period between the Carboniferous and the Permian. A reconstructed relative sea-level curve is concordant with eustasy in the Carboniferous, but discordant in the Permian, implying that the influence of local tectonic movements was dominant in the Permian.

키워드

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