Lake Qarun (Faiyum Oasis), cores F1-08 and F4-08
Faiyum, about 80 km south of Cairo, Égypte
Sediments
- Type
- Sediment
Lake connected to the Nile through the Bahr Yussef for about 10,000 years; cores from 0 to 7700 years BP, plus one pre-lake sediment (F4-08, 25 m). Vilela et al. (2025): the Nile already carries heavy delta49Ti (+0.149 ± 0.019 ‰, 2SE) before the delta, through about 45 % of felsic rocks (Ethiopian Traps and basement).
δ49Ti in ‰ (per mil) Values of the same system
Standard : OL-Ti
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 0.15 ± 0.03 ‰ | 0.11 / 0.2 ‰ | 9 | lake sediment (bulk) Mean and standard deviation recalculated from 9 analyses, +0.11 to +0.20 (F4-08 1-2 m D:20 cm (400 ans BP, sable <5 %) +0.11; F4-08 11-12 m D:40 cm (6400 ans BP, sable 55-65 %) +0.18; F4-08 13-14 m D:63 cm (7700 ans BP, sable <5 %) +0.20; F4-08 25-26 m D:20 cm (antérieur au lac, sable 80 %) +0.15; F1-08 0,5-1,15 m D:40 cm (100 ans BP, sable <5 %) +0.12; F1-08 5,2-6 m D:48 cm (1700 ans BP, sable <5 %) +0.15; F1-08 5,2-6 m D:68 cm (1850 ans BP, sable <5 %) +0.15; F1-08 8,3-9,1 m D:17 cm (3200 ans BP, sable <5 %) +0.14; F1-08 13,1-13,9 m D:20 cm (5800 ans BP, sable 30 %) +0.14). Heavier values in the 7700 to 6400 years BP levels of core F4-08 (period with a larger White Nile contribution), trend uncertain at ± 0.03 ‰. | Vilela et al. (2025), Titanium, strontium and neodymium isotopic compositions of Lake Qar… |
87Sr/86Sr isotope ratio, no unit Values of the same system
Standard : NIST SRM 987
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 0.70754 ± 0.00052 | 0.70668 / 0.70837 | 9 | lake sediment (bulk) Mean and standard deviation recalculated from 9 analyses, 0.70668 to 0.70837 (F4-08 1-2 m D:20 cm 0.70694; F4-08 11-12 m D:40 cm 0.70668; F4-08 13-14 m D:63 cm 0.70728; F4-08 25-26 m D:20 cm 0.70755; F1-08 0,5-1,15 m D:40 cm 0.70772; F1-08 5,2-6 m D:48 cm 0.70776; F1-08 5,2-6 m D:68 cm 0.70802; F1-08 8,3-9,1 m D:17 cm 0.70837; F1-08 13,1-13,9 m D:20 cm 0.70755). Between Nile sediments in Sudan and those of the delta. | Vilela et al. (2025), Titanium, strontium and neodymium isotopic compositions of Lake Qar… |
εNd(t) in ε units (parts per 10,000) Values of the same system
Standard : CHUR
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −2.5 ± 1 ε | −3.9 / −1.2 ε | 9 | lake sediment (bulk) Mean and standard deviation recalculated from 9 analyses, -3.9 to -1.2 (F4-08 1-2 m D:20 cm -1.7; F4-08 11-12 m D:40 cm -1.4; F4-08 13-14 m D:63 cm -2.4; F4-08 25-26 m D:20 cm -1.2; F1-08 0,5-1,15 m D:40 cm -3.9; F1-08 5,2-6 m D:48 cm -3.6; F1-08 5,2-6 m D:68 cm -3.0; F1-08 8,3-9,1 m D:17 cm -2.9; F1-08 13,1-13,9 m D:20 cm -2.1). Published mean -2.5 ± 0.6 (2SE), higher than Nile deep-sea fan sediments (-3.9, Blanchet et al., 2014). | Vilela et al. (2025), Titanium, strontium and neodymium isotopic compositions of Lake Qar… |
Deposits of the same type
- Pebble iron oxide precipitates United States
- Laohugou No. 12 Glacier cryoconite China
- Yuzhufeng Glacier cryoconite China
- Bayi Glacier cryoconite China
- Qiyi Glacier cryoconite China
- Yulong Snow Mountains glacier cryoconite China
- Hailuogou Glacier (Mount Gongga) cryoconite China
- Dangxiong Glacier cryoconite China
Cite this page
IsoFind Atlas (2026). Lake Qarun (Faiyum Oasis), cores F1-08 and F4-08, isotope signatures. https://www.isofind.tech/isotopes/en/sites/lac-qarun-oasis-du-fayoum-carottes-f1-08-et-f4-08/ (accessed 2026-10-21).
@misc{isofind2026lakeqarunfaiyumoasiscoresf108,
title = {Lake Qarun (Faiyum Oasis), cores F1-08 and F4-08, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/sites/lac-qarun-oasis-du-fayoum-carottes-f1-08-et-f4-08/},
note = {Accessed 2026-10-21}
}Updated : 2026-10-21