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Professor Darren Grocke's Outputs (152)

On the nature of methane gas-hydrate dissociation during the Toarcian and Aptian oceanic anoxic events (2002)
Journal Article
Beerling, D., Lomas, M., & Gröcke, D. (2002). On the nature of methane gas-hydrate dissociation during the Toarcian and Aptian oceanic anoxic events. American journal of science (1880), 302(1), 28-49. https://doi.org/10.2475/ajs.302.1.28

The magnitude and timing of a major rapid negative carbon-isotope excursion recorded in marine and terrestrial matter through the Early Toarcian (Early Jurassic) and Early Aptian (Early Cretaceous) oceanic anoxic events (OAEs) have been proposed to b... Read More about On the nature of methane gas-hydrate dissociation during the Toarcian and Aptian oceanic anoxic events.

Nitrogen isotope evidence for water mass denitrification during the early Toarcian (Jurassic) oceanic anoxic event (2001)
Journal Article
Jenkyns, H., Gröcke, D., & Hesselbo, S. (2001). Nitrogen isotope evidence for water mass denitrification during the early Toarcian (Jurassic) oceanic anoxic event. Paleoceanography, 16(6), 593-603. https://doi.org/10.1029/2000pa000558

Bulk sedimentary nitrogen isotope (δ15Ntot) data have been generated from Lower Jurassic black, carbon-rich shales in the British Isles and northern Italy deposited during the early Toarcian oceanic anoxic event. A pronounced positive δ15Ntot excursi... Read More about Nitrogen isotope evidence for water mass denitrification during the early Toarcian (Jurassic) oceanic anoxic event.

A potential global stratotype for the Sinemurian_Pliensbachian boundary (Lower Jurassic), Robin Hood's Bay, UK: ammonite faunas and isotope stratigraphy. (2000)
Journal Article
Hesselbo, S., Meister, C., & Gröcke, D. (2000). A potential global stratotype for the Sinemurian_Pliensbachian boundary (Lower Jurassic), Robin Hood's Bay, UK: ammonite faunas and isotope stratigraphy. Geological Magazine, 137(6), 601-607. https://doi.org/10.1017/s0016756800004672

A coastal exposure at Wine Haven, Robin Hood's Bay (North Yorkshire, UK) fulfils the criteria for definition as the Global Stratotype Section and Point (GSSP) for the base of the Pliensbachian Stage (Lower Jurassic). This marine sequence was deposite... Read More about A potential global stratotype for the Sinemurian_Pliensbachian boundary (Lower Jurassic), Robin Hood's Bay, UK: ammonite faunas and isotope stratigraphy..

Integrated stratigraphy across the Aptian-Albian boundary in the Marnes Bleues, at the Col de Pré-Guittard, Arnayon (Drôme), and at Tartonne (Alpes-de-Haute-Provence), France: a candidate Global Boundary Stratotype Section and Boundary Point for the base of the Albian Stage. (2000)
Journal Article
Kennedy, W., Gale, A., Bown, P., Caron, M., Davey, R., Gröcke, D., & Wray, D. (2000). Integrated stratigraphy across the Aptian-Albian boundary in the Marnes Bleues, at the Col de Pré-Guittard, Arnayon (Drôme), and at Tartonne (Alpes-de-Haute-Provence), France: a candidate Global Boundary Stratotype Section and Boundary Point for the base of the Albian Stage. Cretaceous Research, 21(5), 591-720. https://doi.org/10.1006/cres.2000.0223

The history of definition of the Aptian-Albian boundary is reviewed with particular reference to the ammonite schemes of Brinkmann (1937), Breistroffer (1947), Casey (1961a, 1996, 1999), Kemper (1982), Owen (1996, 1999), and Ruffell & Owen (1995). Th... Read More about Integrated stratigraphy across the Aptian-Albian boundary in the Marnes Bleues, at the Col de Pré-Guittard, Arnayon (Drôme), and at Tartonne (Alpes-de-Haute-Provence), France: a candidate Global Boundary Stratotype Section and Boundary Point for the base of the Albian Stage..

Massive dissociation of gas hydrate during a Jurassic oceanic anoxic event. (2000)
Journal Article
Hesselbo, S., Gröcke, D., Jenkyns, H., Bjerrum, C., Farrimond, P., Morgans Bell, H., & Green, O. (2000). Massive dissociation of gas hydrate during a Jurassic oceanic anoxic event. Nature, 406(6794), 392-395. https://doi.org/10.1038/35019044

In the Jurassic period, the Early Toarcian oceanic anoxic event (about 183 million years ago) is associated with exceptionally high rates of organic-carbon burial, high palaeotemperatures and significant mass extinction1, 2, 3, 4. Heavy carbon-isotop... Read More about Massive dissociation of gas hydrate during a Jurassic oceanic anoxic event..

Carbon-isotope composition of Lower Cretaceous fossil wood: Ocean-atmosphere chemistry and relation to sea-level change (1999)
Journal Article
Gröcke, D., Hesselbo, S., & Jenkyns, H. (1999). Carbon-isotope composition of Lower Cretaceous fossil wood: Ocean-atmosphere chemistry and relation to sea-level change. Geology, 27(2), 155-158. https://doi.org/10.1130/0091-7613%281999%29027%3C0155%3Acicolc%3E2.3.co%3B2

The carbon-isotope composition of fossil wood fragments, collected through a biostratigraphically well-constrained Aptian (Lower Cretaceous) shallow-marine siliciclastic succession on the Isle of Wight, southern Britain, shows distinct variations wit... Read More about Carbon-isotope composition of Lower Cretaceous fossil wood: Ocean-atmosphere chemistry and relation to sea-level change.

Carbon-isotope analyses of fossil plants as a chemostratigraphic and palaeoenvironmental tool. (1998)
Journal Article
Gröcke, D. (1998). Carbon-isotope analyses of fossil plants as a chemostratigraphic and palaeoenvironmental tool. Lethaia: An International Journal of Palaeontology and Stratigraphy, 31(1), 1-13. https://doi.org/10.1111/j.1502-3931.1998.tb00482.x

A review of carbon-isotope analysis (δ13C) of terrestrial organic matter indicates that this has become a valuable tool for stratigraphic correlation between marine and non-marine sequences as well as providing palaeoenvironmental information. Early... Read More about Carbon-isotope analyses of fossil plants as a chemostratigraphic and palaeoenvironmental tool..

Annual rainfall and nitrogen-isotope correlation in macropod collagen: application as a palaeoprecipitation indicator. (1997)
Journal Article
Gröcke, D., Bocherens, H., & Mariotti, A. (1997). Annual rainfall and nitrogen-isotope correlation in macropod collagen: application as a palaeoprecipitation indicator. Earth and Planetary Science Letters, 153(3-4), 279-285. https://doi.org/10.1016/s0012-821x%2897%2900189-1

Collagen has been extracted and analysed for δ15N from modern kangaroos, macropods (Macropus eugenii, M. antilopinus, M. fuliginosus, M. rufus, M. robustus), in Western Australia and South Australia. Comparison of nitrogen-isotope ratios with annual... Read More about Annual rainfall and nitrogen-isotope correlation in macropod collagen: application as a palaeoprecipitation indicator..

Determination of the abundance and carbon isotope composition of elemental carbon in sediments. (1997)
Journal Article
Bird, M., & Gröcke, D. (1997). Determination of the abundance and carbon isotope composition of elemental carbon in sediments. Geochimica et Cosmochimica Acta, 61(16), 3413-3423. https://doi.org/10.1016/s0016-7037%2897%2900157-9

We report measurements of the susceptibility of a variety of elemental and organic carbon samples to oxidative degradation using both acid dichromate and basic peroxide reagents. Organic carbon is rapidly oxidized using either reagent, or both reagen... Read More about Determination of the abundance and carbon isotope composition of elemental carbon in sediments..

Stable-isotope studies on the collagenic and hydroxylapatite components of fossils: Palaeoecological implications (1997)
Journal Article
Gröcke, D. (1997). Stable-isotope studies on the collagenic and hydroxylapatite components of fossils: Palaeoecological implications. Lethaia: An International Journal of Palaeontology and Stratigraphy, 30(1), 65-78. https://doi.org/10.1111/j.1502-3931.1997.tb00445.x

Collagenic material has been extracted and analysed for stable carbon- and nitrogen-isotope ratios from Henschke Cave, a Late Pleistocene fossil locality, South Australia. The carnivore Thylacoleo carnifex most likely consumed omnivores (Parameles sp... Read More about Stable-isotope studies on the collagenic and hydroxylapatite components of fossils: Palaeoecological implications.