Core GC02, southern Mariana Trench
Northern overriding plate of the southern Mariana Trench, 5455 m water depth, Océan Pacifique (eaux internationales)
Sediments
- Type
- Sediment
Brown clayey muds about 55 km from the Challenger Deep. Lower part (41 to 96 cm) at 15.6 to 17.6 µg/g Ga, derived from basaltic volcanic debris; upper part (0 to 36 cm) diluted by biogenic silica (diatoms, 2.7 to 10.9 µg/g) with uptake of seawater Ga by reverse weathering at the top. Uniform δ71Ga, equal to the basalts: an isotopically light gallium sink for the ocean (Qin et al., 2025). Published coordinates.
δ71Ga in ‰ (per mil) Values of the same system
Standard : IPGP-Ga
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −0.01 ± 0.03 ‰ | −0.05 / 0.05 ‰ | 7 | biogenic-silica-rich siliceous sediment, upper part (0 to 36 cm) Mean and standard deviation recalculated from 7 analyses, samples GC02-1 to GC02-7, 2.7 to 10.9 µg/g Ga; neither biogenic dilution nor reverse weathering changes δ71Ga. | Qin et al. (2025), Gallium behavior and isotopic compositions in marine siliceous sedimen… |
| −0.02 ± 0.02 ‰ | −0.06 / 0.01 ‰ | 10 | volcanic-debris-rich siliceous sediment, lower part (41 to 96 cm) Mean and standard deviation recalculated from 10 analyses, samples GC02-8 to GC02-17, 15.6 to 17.6 µg/g Ga, like basalts (0.00 ± 0.05 ‰); unassigned replicate not included. | Qin et al. (2025), Gallium behavior and isotopic compositions in marine siliceous sedimen… |
Deposits of the same type
- Honda Bay coastal marine sediments (Palawan) Philippines
- Ulsan Bay sediments (Onsan refineries) Corée du Sud
- Yulong Snow Mountains glacier cryoconite China
- Hailuogou Glacier (Mount Gongga) cryoconite China
- Dangxiong Glacier cryoconite China
- Bayi Glacier cryoconite China
- Qiyi Glacier cryoconite China
- Laohugou No. 12 Glacier cryoconite China
Cite this page
IsoFind Atlas (2026). Core GC02, southern Mariana Trench, isotope signatures. https://www.isofind.tech/isotopes/en/sites/carotte-gc02-fosse-des-mariannes-meridionale/ (accessed 2026-10-15).
@misc{isofind2026coregc02southernmarianatrench,
title = {Core GC02, southern Mariana Trench, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/sites/carotte-gc02-fosse-des-mariannes-meridionale/},
note = {Accessed 2026-10-15}
}Updated : 2026-10-15