Searched for: subject:"isotope"
(1 - 10 of 10)
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Eggenkamp, H.G.M. (author), Louvat, P. (author), Agrinier, P. (author), Bonifacie, M. (author), Bekker, A. (author), Krupenik, V. (author), Griffioen, J. (author), Horita, J. (author), Brocks, J.J. (author), Bagheri, R. (author)
We determined the chlorine and bromine isotope compositions of 83 halite samples from nine different geological periods between the Orosirian and the present in order to study the secular Cl and Br isotope variations in the ocean during the last 2 billion years. Relatively large Cl (-0.24 to +0.51%e vs. SMOC) and Br ( —0.24 to +1.08%e vs. SMOB)...
article 2019
document
van de Schootbrugge, B. (author), Houben, A.J.P. (author), Ercan, F.E.Z. (author), Verreussel, R. (author), Kerstholt, S. (author), Janssen, N.M.M. (author), Nikitenko, B. (author), Suan, G. (author)
The Toarcian Oceanic Anoxic Event (T-OAE, c. 182 Ma) represents a major perturbation of the carbon cycle marked by widespread black shale deposition. Consequently, the onset of the T-OAE has been linked to the combined effects of global warming, high productivity, basin restriction and salinity stratification. However, the processes that led to...
article 2019
document
Schout, G. (author), Griffioen, J. (author), Majid Hassanizadeh, S. (author), Cardon de Lichtbuer, G. (author), Hartog, N. (author)
Methane leakage caused by well integrity failure was assessed at 28 abandoned gas wells and 1 oil well in the Netherlands, which have been plugged, cut and buried to below the ground surface (≥3 mbgl). At each location, methane concentrations were thoroughly scanned at the surface. A static chamber setup was used to measure methane flow rates...
article 2019
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Eggenkamp, H.G.M. (author), Louvat, P. (author), Griffioen, J. (author), Agrinier, P. (author)
article 2019
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Bijl, P.K. (author), Houben, A.J.P. (author), Bruls, A. (author), Pross, J. (author), Sangiorgi, F. (author)
There is growing interest in the scientific community in reconstructing the paleoceanography of the Southern Ocean during the Oligocene-Miocene because these time intervals experienced atmospheric CO2 concentrations with relevance to our future. However, it has remained notoriously difficult to put the sedimentary archives used in these efforts...
article 2018
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Goldberg, T. (author), Poulton, S.W. (author), Wagner, T. (author), Kolonic, S.F. (author), Rehkämper, M. (author)
During the Cretaceous greenhouse, episodes of widespread ocean deoxygenation were associated with globally occurring events of black shale deposition. Possibly the most pronounced of these oceanic anoxic events (OAE's) was the Cenomanian-Turonian OAE2 (~94 Ma). However, although certain redox sensitive trace metals tend to be preferentially...
article 2016
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Douglas, P.M.J. (author), Affek, H.P. (author), Ivany, L.C. (author), Houben, A.J.P. (author), Sijp, W.P. (author), Sluijs, A. (author), Schouten, S. (author), Pagani, M. (author)
Paleoclimate studies suggest that increased global warmth during the Eocene epoch was greatly amplified at high latitudes, a state that climate models cannot fully reproduce. However, proxy estimates of Eocene near-Antarctic sea surface temperatures (SSTs) have produced widely divergent results at similar latitudes, with SSTs above 20 °C in the...
article 2014
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Berg, S. (author), Leng, M.J. (author), Kendrick, C.P. (author), Cremer, H. (author), Wagner, B. (author)
Organic carbon occluded in diatom silica is assumed to be protected from degradation in the sediment. δ13C from diatom carbon (δ13C(diatom)) therefore potentially provides a signal of conditions during diatom growth. However, there have been few studies based on δ13C(diatom). Numerous variables can influence δ13C of organic matter in the marine...
article 2013
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Schroot, B.M. (author), Klaver, G.T. (author), Schüttenhelm, R.T.E. (author)
Expressions of gas seepage observable within North Sea seismic and acoustic data include seabed pockmarks, seepage plumes in the water column, acoustic blanking, shallow enhanced reflectors, and shallow seismic chimneys. Three areas were selected for a marine survey in
article 2005
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Jansen, H.S.M. (author), Huizer, J. (author), Dijkmans, J.W.A. (author), van Hinte, J.E. (author), Nederlands Instituut voor Toegepaste Geowetenschappen TNO (author)
87Sr/86Sr (Strontium) ratio analyses of shell material (mainly Arctica islandica) from 24 levels in the Maassluis Formation of boreholes Noordwijk, Zegveld and Terschelling suggest that the age of the formation ranges from 0.82 to 2.34 Ma (± 0.5 Ma), and that the Oosterhout Formation at Noordwijk could be as much as 2.5 Ma older than hitherto...
article 2004
Searched for: subject:"isotope"
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