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743 ± 17 Ma Granite Clast From Jurassic Conglomerate, Kamiaso, Mino Terrane, Japan: The Case For South China Craton Provenance (Korean Gyeonggi Block?), Allen Phillip Nutman, Y Sano, K Terada, H Hidaka

Faculty of Science - Papers (Archive)

The polymict Kamiaso Conglomerate (Mino Terrane, Japan) contains Jurassic to Palaeoproterozoic clasts—probably derived from Korean basement that lay nearby to the northwest at time of deposition. Clast K2 broke cleanly into two halves during sampling (but the halves were recombined for zircon separation). A third of the K2 zircons are colourless euhedral prisms with oscillatory zoning, with no inheritance and yielded a SHRIMP U/Pb date of 743±17 Ma. Two thirds of K2 zircons are brown oscillatory-zoned corroded prisms with a date of 1860±8 Ma, with inherited cores up to ∼2460 Ma. A likely explanation for this could be that clast …