Lichtschlag, Anna; Connelly, Douglas P (2017): Geochemistry of sediment cores and hydrochemistry of water bottle samples in the North Sea during James Cook cruise JC077 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.883560, Supplement to: Lichtschlag, Anna; Cevatoglu, Melis; Connelly, Douglas P; James, Rachael H; Bull, Jonathan M (2018): Increased Fluid Flow Activity in Shallow Sediments at the 3 km Long Hugin Fracture in the Central North Sea. Geochemistry, Geophysics, Geosystems, 19(1), 2-20, https://doi.org/10.1002/2017GC007181
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Abstract:
The North Sea hosts a wide variety of seafloor seeps that may be important for transfer of chemical species, such as methane, from the Earth's interior to its exterior. Here we provide geochemical and geophysical evidence for fluid flow within shallow sediments at the recently discovered, 3 -km long Hugin Fracture in the Central North Sea. Although venting of gas bubbles was not observed, concentrations of dissolved methane were significantly elevated (up to six-times background values) in the water column at various locations above the fracture, and microbial mats that form in the presence of methane were observed at the seafloor. Seismic amplitude anomalies revealed a bright spot at a fault bend that may be the source of the water column methane. Sediment porewaters recovered in close proximity to the Hugin Fracture indicate the presence of fluids from two different shallow (<500 m) sources: (i) a reduced fluid characterized by elevated methane concentrations and/or high levels of dissolved sulfide (up to 6 mmol L-1), and (ii) a low-chlorinity fluid (Cl ~305 mmol L-1) that has low levels of dissolved methane and/or sulfide. The area of the seafloor affected by the presence of methane-enriched fluids is similar to the footprint of seepage from other morphological features in the North Sea.
Related to:
Connelly, Douglas P (2012): RSS James Cook (JC077) Cruise to Sleipner: JC077, 2nd - 28th September 2012. National Oceanography Centre, Southampton, U.K., 64 pp, https://doi.org/10.3289/CR_ECO2_20196
Project(s):
Funding:
Seventh Framework Programme (FP7), grant/award no. 265847: Sub-seabed CO2 Storage: Impact on Marine Ecosystems
Coverage:
Median Latitude: 58.507061 * Median Longitude: 2.045423 * South-bound Latitude: 55.988400 * West-bound Longitude: 1.810283 * North-bound Latitude: 58.596433 * East-bound Longitude: 2.322700
Date/Time Start: 2012-09-04T15:46:00 * Date/Time End: 2012-09-25T16:43:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
25 datasets
Download Data
Datasets listed in this publication series
- Lichtschlag, A; Connelly, DP (2015): Hydrochemistry measured on water bottle samples during James Cook cruise JC077. https://doi.org/10.1594/PANGAEA.842819
- Lichtschlag, A (2015): Geochemistry of North Sea sediment core JC077-VC01. https://doi.org/10.1594/PANGAEA.843588
- Lichtschlag, A (2015): Porewater geochemistry of North Sea sediment core JC077-VC01. https://doi.org/10.1594/PANGAEA.843612
- Lichtschlag, A (2015): Geochemistry of North Sea sediment core JC077-VC04. https://doi.org/10.1594/PANGAEA.843589
- Lichtschlag, A (2015): Porewater geochemistry of North Sea sediment core JC077-VC04. https://doi.org/10.1594/PANGAEA.843613
- Lichtschlag, A (2015): Geochemistry of North Sea sediment core JC077-VC08. https://doi.org/10.1594/PANGAEA.843590
- Lichtschlag, A (2015): Porewater geochemistry of North Sea sediment core JC077-VC08. https://doi.org/10.1594/PANGAEA.843614
- Lichtschlag, A (2015): Geochemistry of North Sea sediment core JC077-VC10. https://doi.org/10.1594/PANGAEA.843591
- Lichtschlag, A (2015): Porewater geochemistry of North Sea sediment core JC077-VC10. https://doi.org/10.1594/PANGAEA.843615
- Lichtschlag, A (2015): Geochemistry of North Sea sediment core JC077-VC12. https://doi.org/10.1594/PANGAEA.843592
- Lichtschlag, A (2015): Porewater geochemistry of North Sea sediment core JC077-VC12. https://doi.org/10.1594/PANGAEA.843616
- Lichtschlag, A (2015): Geochemistry of North Sea sediment core JC077-VC14. https://doi.org/10.1594/PANGAEA.843593
- Lichtschlag, A (2015): Porewater geochemistry of North Sea sediment core JC077-VC14. https://doi.org/10.1594/PANGAEA.843617
- Lichtschlag, A (2015): Geochemistry of North Sea sediment core JC077-VC15. https://doi.org/10.1594/PANGAEA.843594
- Lichtschlag, A (2015): Porewater geochemistry of North Sea sediment core JC077-VC15. https://doi.org/10.1594/PANGAEA.843618
- Lichtschlag, A (2015): Geochemistry of North Sea sediment core JC077-VC16. https://doi.org/10.1594/PANGAEA.843595
- Lichtschlag, A (2015): Porewater geochemistry of North Sea sediment core JC077-VC16. https://doi.org/10.1594/PANGAEA.843619
- Lichtschlag, A (2015): Geochemistry of North Sea sediment core JC077-VC20. https://doi.org/10.1594/PANGAEA.843596
- Lichtschlag, A (2015): Porewater geochemistry of North Sea sediment core JC077-VC20. https://doi.org/10.1594/PANGAEA.843620
- Lichtschlag, A (2015): Geochemistry of North Sea sediment core JC077-VC23. https://doi.org/10.1594/PANGAEA.843597
- Lichtschlag, A (2015): Porewater geochemistry of North Sea sediment core JC077-VC23. https://doi.org/10.1594/PANGAEA.843621
- Lichtschlag, A (2015): Geochemistry of North Sea sediment core JC077-VC24. https://doi.org/10.1594/PANGAEA.843598
- Lichtschlag, A (2015): Porewater geochemistry of North Sea sediment core JC077-VC24. https://doi.org/10.1594/PANGAEA.843622
- Lichtschlag, A (2015): Geochemistry of North Sea sediment core JC077-VC28. https://doi.org/10.1594/PANGAEA.843599
- Lichtschlag, A (2015): Porewater geochemistry of North Sea sediment core JC077-VC28. https://doi.org/10.1594/PANGAEA.843623