Eastern equatorial Pacific, ODP Site 677: siliceous and calcareous oozes
North Pacific, Océan Pacifique (eaux internationales)
Sediments
- Type
- Sediment
Surface marine sediment analysed by Ishikawa and Nakamura (1993); δ11B of modern sediments controlled by mixing of continental detritus (illite), marine smectite, biogenic carbonates and silica. Equatorial high-productivity zone; late Miocene siliceous nannofossil chalk (677A, 274 m) and Quaternary diatom-nannofossil ooze (677B, 61 m, 36 % carbonate).
δ11B in ‰ (per mil) Values of the same system
Standard : NIST SRM 951
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 4.8 ‰ | 1 | late Miocene siliceous nannofossil chalk Single analysis (ODP 677A 30-3). 13.4 µg/g B; highest value of the modern sediments. | Ishikawa & Nakamura (1993), Boron isotope systematics of marine sediments, Earth and Plan… | |
| 0.9 ‰ | 1 | diatom-nannofossil ooze (bulk) Single analysis (ODP 677B 7-4). 60.2 µg/g B. | Ishikawa & Nakamura (1993), Boron isotope systematics of marine sediments, Earth and Plan… | |
| 16.5 ‰ | 1 | biogenic carbonate (HCl-soluble fraction) Single analysis (ODP 677B 7-4). 25.6 µg/g B. | Ishikawa & Nakamura (1993), Boron isotope systematics of marine sediments, Earth and Plan… | |
| −1.1 ‰ | 1 | diatom ooze (HCl-insoluble residue) Single analysis (ODP 677B 7-4). 77.1 µg/g B. | Ishikawa & Nakamura (1993), Boron isotope systematics of marine sediments, Earth and Plan… |
Deposits of the same type
- Cariaco Basin, core-top sediment PL07-111Bx Venezuela
- Cariaco Basin, core-top sediment PL07-105Bx Venezuela
- Cariaco Basin, core-top sediment PL07-22Bx Venezuela
- Cariaco Basin, core-top sediment PL07-82Bx Venezuela
- Cariaco Basin, core-top sediment PL07-89Bx Venezuela
- Cariaco Basin, core-top sediment PL07-69Bx Venezuela
- Paraíba do Sul and Guandu rivers Brazil
- Natural Qaamarujuk fjord sediments (pre-mining) Greenland
Cite this page
IsoFind Atlas (2026). Eastern equatorial Pacific, ODP Site 677: siliceous and calcareous oozes, isotope signatures. https://www.isofind.tech/isotopes/en/sites/pacifique-equatorial-est-site-odp-677-boues-siliceuses-et-calcaires/ (accessed 2026-10-19).
@misc{isofind2026easternequatorialpacificodpsi,
title = {Eastern equatorial Pacific, ODP Site 677: siliceous and calcareous oozes, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/sites/pacifique-equatorial-est-site-odp-677-boues-siliceuses-et-calcaires/},
note = {Accessed 2026-10-19}
}Updated : 2026-10-19