Umber as a lithified REY-rich mud in Japanese accretionary complexes and its implications for the osmium isotopic composition of Middle Cretaceous seawater

Koichiro Fujinaga,Kentaro Nakamura,Junichiro Ohta,Moei Yano,Yusuke Kuwahara,Kazutaka Yasukawa,Yutaro Takaya, Ken Nakayama,Tatsuo Nozaki,Yasuhiro Kato

Ore Geology Reviews（2022）

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摘要

•The Aki umber was formed by hydrothermal activity at a mid-ocean ridge.•The Aki umber is a lithified REY-rich mud accreted during the Late Cretaceous.•The 187Os/188Os ratios of Late Cretaceous seawater ranged between 0.4 and 0.6.

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关键词

Marine Os isotope record,Umber deposit,REY-rich mud,Hydrothermal iron oxyhydroxide-type,Accretionary complex,Middle Cretaceous

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