Subdivision of the Upper Paleozoic Taean Formation in the Anmyeondo-Boryeong area, west Korea: a preliminary approach to the sedimentary organization and structural features

SHRIMP U-Pb ages of detrital zircons in metasandstones of the Taean Formation, western Gyeonggi massif, Korea: Tectonic implications

“…1; Choi et al, 2008). Primary goals of this study are: (1) to determine the SHRIMP U-Pb zircon ages and their distribution in the Taean Formation; and (2) to compare our result with geochronologic data available from other (meta-)sedimentary units in Korea.…”

“…The Taean Formation occurring in western Gyeonggi massif, Korea, consists primarily of low-grade sandstone-mudstone units largely represented by turbiditic sequences (Choi et al, 2008). This formation has been traditionally thought to occur only in the Taean Peninsula and belong to the Precambrian cover-rock sequence (Fig.…”

“…The latter inference was partly based upon the prevalence of the greenschistfacies metasedimentary rocks in marked contrast with the abundance of higher-grade gneisses in the basement (see the review of Na et al, 1982). However, Choi et al (2008) recently documented that the Taean Formation extensively occur to the south of the Taean Peninsula, primarily in Anmyeon Island. In addition, based on sensitive high-resolution ion microprobe (SHRIMP) U-Pb ages of zircon in a metasandstone sample from the Taean Peninsula, Cho (2007) suggested that the Taean Formation is an Upper Paleozoic sequence deposited between ca.…”

“…402 Ma and 229 Ma. This result led Choi et al (2008) to propose that the Taean Formation could be correlative with Upper Paleozoic strata such as the Imjin and Pyeongan groups in the Imjingang and Ogcheon belts, respectively. This proposition has a profound implication for establishing the stratigraphy and tectonics of the Korean Peninsula.…”

Lithology and Geology of Deokjeok Island, Western Gyeonggi Massif, Central Korea

“…이는 그동안 경기육괴의 기반암이 고원생대암으로 주 로 구성되었으리라는 기존의 연구결과와는 차이가 있 다(cf., Lee et al, 2000). 또한, 최근까지 선캠브리아 변성퇴적암으로 알려져 왔던 소위 태안층의 암석들이 사실은 데본기 지층일 가능성이 큰 것으로 보고되었 다 (Choi et al, 2008;Cho et al, 2010;Na et al, 2012;So et al, 2013).…”