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- W2748838690 abstract "Abstract Detrital zircon multi‐chronology combined with provenance and low‐grade metamorphism analyses enables the reinterpretation of the tectonic evolution of the C retaceous S himanto accretionary complex in S outhwest J apan. Detrital zircon U – P b ages and provenance analysis defines the depositional age of trench‐fill turbidites associated with igneous activity in provenance. Periods of low igneous activity are recorded by youngest single grain zircon U – P b ages ( YSG ) that approximate or are older than the depositional ages obtained from radiolarian fossil‐bearing mudstone. Periods of intensive igneous activity recorded by youngest cluster U – P b ages ( YC 1σ) that correspond to the younger limits of radiolarian ages. The YC 1σ U – P b ages obtained from sandstones within mélange units provide more accurate younger depositional ages than radiolarian ages derived from mudstone. Determining true depositional ages requires a combination of fossil data, detrital zircon ages, and provenance information. Fission‐track ages using zircons estimated YC 1σ U – P b ages are useful for assessing depositional and annealing ages for the low‐grade metamorphosed accretionary complex. These new dating presented here indicates the following tectonic history of the accretionary wedge. Evolution of the S himanto accretionary complex from the A lbian to the T uronian was caused by the subduction of the I zanagi plate, a process that supplied sediments via the erosion of P ermian and T riassic to E arly J urassic g ranitic rocks and the eruption of minor amounts of E arly C retaceous intermediate volcanic rocks. The complex subsequently underwent intensive igneous activity from the C oniacian to the early P aleocene as a result of the subduction of a hot and young oceanic slab, such as the K ula– P acific plate. Finally, the major out‐of‐sequence thrusts of the F ukase F ault and the A ki T ectonic L ine formed after the middle E ocene, and this reactivation of the S himanto accretionary complex as a result of the subduction of the P acific plate." @default.
- W2748838690 created "2017-08-31" @default.
- W2748838690 creator A5000130543 @default.
- W2748838690 creator A5007702499 @default.
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- W2748838690 creator A5072109729 @default.
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- W2748838690 date "2017-08-14" @default.
- W2748838690 modified "2023-10-16" @default.
- W2748838690 title "Detrital zircon multi-chronology, provenance, and low-grade metamorphism of the Cretaceous Shimanto accretionary complex, eastern Shikoku, Southwest Japan: Tectonic evolution in response to igneous activity within a subduction zone" @default.
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