IODP Site M0004A (Lomonosov Ridge)
Arctic Ocean, Lomonosov Ridge (IODP Expedition 302), Océan Arctique (eaux internationales)
Sediments
- Type
- Sediment
Section of organic-rich mudrocks (up to 18 % organic carbon) from the Paleocene-Eocene Thermal Maximum (55.9 Ma) studied by Dickson et al. (2015) for seawater 187Os/188Os.
187Os/188Os isotope ratio, no unit Values of the same system
Standard : Rapport absolu, sans standard de référence
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 0.449 ± 0.049 | 0.392 / 0.542 | 9 | organic mudrock below the ratio rise (390.66 to 403.95 m), initial ratio Mean and standard deviation recalculated from 9 analyses, 0.392 to 0.542 (32-2 116-117 0.392; 34-1 8-9 0.397; 34-1 88-89 0.410; 34-3 7-8 0.427; 34-3 7-8 (2) 0.439; 34-3 67-68 0.472; 35-1 108-109 0.465; 35-2 8-9 0.493; 35-2 125-126 0.542). Oldest levels, 390.66 to 403.95 m composite depth, initial ratio about 0.39 to 0.54. | Dickson et al. (2015), Evidence for weathering and volcanism during the PETM from Arctic … |
| 0.501 ± 0.054 | 0.417 / 0.562 | 6 | organic mudrock of the rise preceding the PETM (388.63 to 390.34 m), initial ratio Mean and standard deviation recalculated from 6 analyses, 0.417 to 0.562 (32-1 63-64 0.494; 32-1 80-81 0.472; 32-2 23-24 0.506; 32-2 44-45 0.553; 32-2 44-45 (2) 0.562; 32-2 84-85 0.417). Rise from 0.39 (390.66 m) to 0.55-0.56 (389.94 m), 4.5 m below the onset of the carbon isotope excursion; attributed by the authors to isolation of the Arctic basin linked to uplift of the North Atlantic Igneous Province. | Dickson et al. (2015), Evidence for weathering and volcanism during the PETM from Arctic … |
| 0.431 ± 0.064 | 0.271 / 0.52 | 18 | organic mudrock of the PETM and above (378.20 to 386.13 m), initial ratio Mean and standard deviation recalculated from 18 analyses, 0.271 to 0.520 (29-1 40-41 0.346; 29-1 79-80 0.271; 30-1 122-123 0.391; 30-2 22.5-23.5 0.315; 30-2 63-64 0.435; 30-2 102.5-103.5 0.452; 30-2 124-125 0.459; 30-3 1-2 0.442; 30-3 22.5-23.5 0.474; 30-3 37-38 0.520; 30-3 37-38 (2) 0.499; 30-3 62-63 0.443; 30-3 62-63 (2) 0.432; 30-3 82.5-83.5 0.481; 30-3 101-102 0.476; 31-CC 7-8 0.457; 31-CC 25-26 0.428; 31-CC 43-44 0.443). PETM isochron at 0.501 ± 0.085 (52.4 ± 7.6 Ma, MSWD 6), all data at 0.520 ± 0.049 (49.3 ± 4.3 Ma, MSWD 23). Higher than in the Tethys: Arctic basin poorly connected to the world ocean. The lowest values come from 29-1 79-80 (0.271) and 30-2 22.5-23.5 (0.315), two levels with high 187Re/188Os (1269 and 934). | Dickson et al. (2015), Evidence for weathering and volcanism during the PETM from Arctic … |
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). IODP Site M0004A (Lomonosov Ridge), isotope signatures. https://www.isofind.tech/isotopes/en/sites/site-iodp-m0004a-ride-de-lomonossov/ (accessed 2026-10-20).
@misc{isofind2026iodpsitem0004alomonosovridgei,
title = {IODP Site M0004A (Lomonosov Ridge), isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/sites/site-iodp-m0004a-ride-de-lomonossov/},
note = {Accessed 2026-10-20}
}Updated : 2026-10-20