Abstract
CHIME (chemical Th-U-total Pb isochron method) ages were determined on detrital monazites in Cretaceous sandstones, southeastern part of the Yongdong Basin and in granitic gneiss (?foliated granite) of the Yongnam Massif, northern part of the Kimchon area. Most detrital monazites in the sandstone samples are chronologically unzoned, and yield CHIME ages of about 180 and 250 Ma. Some detrital monazites show age signatures of middle Precambrian (ca. 1200 and 1750 Ma) and possible Silurian (420 Ma). Monazites in the granitic gneiss yield an unequivocal age of 251.2±3.0 Ma. The age spectrum of detrital monazites coupled with paleoflows and petrographic data suggests that clastic materials in the southeastern part of the Yongdong Basin were largely derived from the granitic and metamorphic rocks of the Yongnam Massif in the Sangju—Kimchon—Keochang area.
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Kim, BC., Choi, SJ., Suzuki, K. et al. Provenance of Creataceous sandstones in the southeastern Yongdong Basin, Korea: CHIME geochronology of detrital monazites. Geosci J 1, 37–49 (1997). https://doi.org/10.1007/BF02910449
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DOI: https://doi.org/10.1007/BF02910449