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Topography, sedimentology, and biochronology of carbonate deposits on seamounts in the JA area, northwestern Pacific Ocean by Yasufumi Iryu; Hikari Hino; Hideko Takayanagi; Tokiyuki Sato; Nobuyuki Okamoto; Akiko Suzuki; Yuho Fujimaki; Akira Usui is a Earth and Planetary Sciences article available to read on EtoBox.
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## Abstract Sedimentological and biochronological analyses were undertaken on carbonate deposits from 20 seamounts belonging to the Marcus–Wake Seamount Group, the Magellan Seamounts, and the Marshall Islands Seamounts in the JA area, northwestern Pacific Ocean. Deposition of carbonates on the JA seamounts varied markedly with age. The oldest carbonate deposits are Lower to middle Cretaceous shallow‐water limestones containing mollusks (including rudists), scleractinian corals, and calcareous sponges. Upper Cretaceous and Paleocene carbonates are rare, and no Oligocene carbonates may exist. In contrast, Eocene foraminiferal packstones are widespread, and Miocene–Pleistocene foraminiferal ooze covers the JA seamounts. The limited occurrence of Paleogene carbonate deposits on the JA seamounts is consistent with global observations (i.e., a paucity of Paleogene carbonates). The Cretaceous–Eocene carbonates have been phosphatized, whereas Miocene and later limestones have not. This fact, along with the results of previous studies, suggests that carbonate rocks on seamounts were phosphatized globally during the Oligocene. Upwelling of nutrient‐rich bottom waters during this time is like
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- Author
- Yasufumi Iryu; Hikari Hino; Hideko Takayanagi; Tokiyuki Sato; Nobuyuki Okamoto; Akiko Suzuki; Yuho Fujimaki; Akira Usui
- Publisher
- Wiley
- Published
- 2023
- Language
- EN
- Field
- Earth and Planetary Sciences (Physical Sciences)