Provenance diversification within an arc‐trench system induced by batholith development: the Cretaceous Japan case |
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| Authors: | Kazumasa Aoki Yukio Isozaki Daisuke Kofukuda Tomohiko Sato Atsushi Yamamoto Kenshi Maki Shuhei Sakata Takafumi Hirata |
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| Institution: | 1. Department of Earth Science and Astronomy, The University of Tokyo, , Meguro, Tokyo, 153‐8902 Japan;2. Department of Life Science, Kinki University, , Osaka, 577‐8502 Japan;3. Department of Geology and Mineralogy, Kyoto University, , Kyoto, 606‐8502 Japan |
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| Abstract: | By comparing detrital zircon U–Pb age spectra of coeval fore‐arc and back‐/intra‐arc basin sandstones, we identified the overall distributary pattern of terrigenous clastic material within the Cretaceous arc system of SW Japan. Abundant Proterozoic (c. 1500–2500 Ma) detrital grains from the interior of East Asia are present in the Cretaceous intra‐arc basin. However, after a barrier mountain range formed during batholith emplacement, Proterozoic clastics were rarely transported into the fore‐arc domain. Episodic batholith formation in Pacific‐type orogens likely played a major role in controlling terrigenous supply routes between coeval back‐arc and fore‐arc domains. The Cretaceous orogen in Japan thus provides a good template for analysing the tectono‐sedimentary development of other arc‐related basins. |
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