Dr Cédric M. John

Sluijs A, Brinkhuis H, Schouten S, Bohaty SM, John CM, Zachos JC, Reichart G-J, Damste JSS, Crouch EM, Dickens GRet al., 2007, Environmental precursors to rapid light carbon injection at the Palaeocene/Eocene boundary, NATURE, Vol: 450, Pages: 1218-U5, ISSN: 0028-0836

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• Citations: 255

Zachos JC, McCarren H, Bohaty S, John C, Sluijs A, Brinkhuis H, Sloan LC, Damste JS, Schouten Set al., 2007, The magnitude of ocean warming during the PETM: Implications for forcing and climate sensitivity, 17th Annual V M Goldschmidt Conference, Publisher: PERGAMON-ELSEVIER SCIENCE LTD, Pages: A1150-A1150, ISSN: 0016-7037

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• Citations: 1

Zachos JC, Bohaty SM, John CM, McCarren H, Kelly DC, Nielsen Tet al., 2007, The Palaeocene-Eocene carbon isotope excursion: constraints from individual shell planktonic foraminifer records, Publisher: ROYAL SOCIETY, Pages: 1829-1842

The Palaeocene-Eocene thermal maximum (PETM) is characterized by a global negative carbon isotope excursion (CIE) and widespread dissolution of seafloor carbonate sediments. The latter feature supports the hypothesis that the PETM and CIE were caused by the rapid release of a large mass (greater than 2000 Ct C) of 12 C-enriched carbon. The source of this carbon, however, remains a mystery. Possible sources include volcanically driven thermal combustion of organic-rich sediment, dissociation of seafloor methane hydrates and desiccation and oxidation of soil/sediment organics. A key constraint on the source(s) is the rate at which the carbon was released. Fast rates would be consistent with a catastrophic event, e.g. massive methane hydrate dissociation, whereas slower rates might implicate other processes. The PETM carbon flux is currently constrained by high-resolution marine and terrestrial records of the CIE. In pelagic bulk carbonate records, the onset of the CIE is often expressed as a single- or multiple-step excursion extending over 10(4) years. Individual planktonic shell records, in contrast, always show a single-step CIE, with either pre-excursion or excursion isotope values, but no transition values. Benthic foraminifera, records, which are less complete owing to extinction and diminutive assemblages, show a delayed excursion. Here, we compile and evaluate the individual planktonic shell isotope data, from several localities. Ve find that the most expanded records consistently show a bimodal isotope distribution pattern regardless of location, water depth or depositional facies. This suggests one of several possibilities: (i) the isotopic composition of the surface ocean/atmosphere declined in a geologic instant ( < 500 yr), (ii) that during the onset of the CIE, most shells of mixed-layer planktonic foraminifera were dissolved, or (iii) the abundances or shell

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Zachos JC, Bohaty SM, John CM, McCarren H, Kelly DC, Nielsen Tet al., 2007, The Palaeocene-Eocene carbon isotope excursion: Constraints from individual shell planktonic foraminifer records, Pages: 1829-1842, ISSN: 1364-503X

The Palaeocene-Eocene thermal maximum (PETM) is characterized by a global negative carbon isotope excursion (CIE) and widespread dissolution of seafloor carbonate sediments. The latter feature supports the hypothesis that the PETM and CIE were caused by the rapid release of a large mass (greater than 2000 Gt C) of 12C-enriched carbon. The source of this carbon, however, remains a mystery. Possible sources include volcanically driven thermal combustion of organic-rich sediment, dissociation of seafloor methane hydrates and desiccation and oxidation of soil/sediment organics. A key constraint on the source(s) is the rate at which the carbon was released. Fast rates would be consistent with a catastrophic event, e.g. massive methane hydrate dissociation, whereas slower rates might implicate other processes. The PETM carbon flux is currently constrained by high-resolution marine and terrestrial records of the CIE. In pelagic bulk carbonate records, the onset of the CIE is often expressed as a single- or multiple-step excursion extending over 104 years. Individual planktonic shell records, in contrast, always show a single-step CIE, with either pre-excursion or excursion isotope values, but no transition values. Benthic foraminifera records, which are less complete owing to extinction and diminutive assemblages, show a delayed excursion. Here, we compile and evaluate the individual planktonic shell isotope data from several localities. We find that the most expanded records consistently show a bimodal isotope distribution pattern regardless of location, water depth or depositional facies. This suggests one of several possibilities: (i) the isotopic composition of the surface ocean/atmosphere declined in a geologic instant (<500yr), (ii) that during the onset of the CIE, most shells of mixed-layer planktonic foraminifera were dissolved, or (iii) the abundances or shell production of these species temporarily declined, possibly due to initial pH changes. © 2007 The

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• Citations: 88

Palike H, Lyle MW, Ahagon N, Raffi I, Gamage K, John CMet al., 2007, Pacific equatorial age transect, Scientific Prospectus, College Station, TX, Publisher: Integrated Ocean Drilling Program

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John CM, Adatte T, Mutti M, 2006, Regional trends in clay mineral fluxes to the Queensland margin and ties to middle Miocene global cooling, PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY, Vol: 233, Pages: 204-224, ISSN: 0031-0182

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• Citations: 9

Behrmann JH, Flemings PB, John CM, Behrmann JH, John CM, Iturrino GJ, Aizawa Y, Binh NTT, De Silva N, Dugan B, Edeskär TM, Franke C, Gay A, Gilhooly WP, Gutierrez-Pastor J, Jiang SY, Long H, Moore JC, Nonoura T, Pirmez C, Reichow M, Sawyer DE, Schneider J, Shumnyk AV, Suzuki T, Takano Y, Urgeles R, Yamamoto Y, Zampetti Vet al., 2006, Rapid sedimentation, overpressure, and focused fluid flow, gulf of mexico continental margin, Scientific Drilling, Vol: 1, Pages: 12-17, ISSN: 1816-8957

Expedition 308 of the Integrated Ocean Drilling Program (IODP) was the first phase of a two-component project dedicated to studying overpressure and fluid flow on the continental slope of the Gulf of Mexico. We examined how sedimentation, overpressure, fluid flow, and deformation are coupled in a passive margin setting and investigated how extremely rapid deposition of fine-grained mud might lead to a rapid build-up of pore pressure in excess of hydrostatic (overpressure), underconsolidation, and sedimentary mass wasting. Our tests within the Ursa region, where sediment accumulated rapidly in the late Pleistocene, included the first-ever in situ measurements of how physical properties, pressure, temperature, and pore fluid compositions vary within low-permeability mudstones that overlie a permeable, overpressured aquifer, and we documented severe overpressure in the mudstones overlying the aquifer. We also drilled and logged three references sites in the Brazos-Trinity Basin IV and documented hydrostatic pressure conditions and normal consolidation. Post-expedition studies will address how the generation and timing of overpressure control slope stability, seafloor seeps, and large-scale crustal fluid flow. The operations of Expedition 308 provide a foundation for future long-term in situ monitoring experiments in the aquifer and bounding mudstones.

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• Citations: 25

Mutti M, John CM, Knoerich A, 2006, Chemostratigraphy in Miocene heterozoan carbonate settings: applications, limitations and perspectives, Cool-Water Carbonates: Depositional Systems and paleoenvironmental controls, Editors: Pedley, Carannante, London, Publisher: Geological Society special publications, Pages: 307-322

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Flemings PB, Behrmann JH, John CM, Expedition 308 scientistset al., 2006, Overpressure and fluid flow processes in the deepwater Gulf of Mexico: slope stability, seeps, and shallow-water flow, College Station, TX, Publisher: Integrated Ocean Drilling Program

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Föllmi KB, Badertscher C, de Kaenel E, Stille P, John CM, Adatte T, Steinmann Pet al., 2005, Phosphogenesis and organic-carbon preservation in the miocene monterey formation at Naples beach, California -: The monterey hypothesis revisited, GEOLOGICAL SOCIETY OF AMERICA BULLETIN, Vol: 117, Pages: 589-619, ISSN: 0016-7606

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• Citations: 74

John CM, Mutti M, 2005, Relative control of paleoceanography, climate, and eustasy over heterozoan carbonates: A perspective from slope sediments of the Marion Plateau (ODP LEG 194), JOURNAL OF SEDIMENTARY RESEARCH, Vol: 75, Pages: 216-230, ISSN: 1527-1404

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• Citations: 18

John CM, Karner GD, Mutti M, 2004, δ<SUP>18</SUP>O and Marion Plateau backstripping:: Combining two approaches to constrain late middle Miocene eustatic amplitude, GEOLOGY, Vol: 32, Pages: 829-832, ISSN: 0091-7613

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• Citations: 74

John CM, 2004, Plotting and analyzing data trends in ternary diagrams made easy, EOS, Vol: 85, Pages: 158-158

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John CM, 2003, Miocene climate as recorded on slope carbonates: examples from Malta (Central Mediterranean) and Northeastern Australia (Marion Plateau, ODP Leg 194), Germany, Publisher: PhD thesis, University of Potsdam

This study investigated the slope carbonates of two Miocene carbonate systems: the Maltese Islands (in the Central Mediterranean) and the Marion Plateau (Northeastern Australia, drilled during ODP Leg 194). The aim of the study was to trace the impact of the Miocene cooling steps (events Mi1-Mi6) in these carbonate systems, especially the Mi3 event, which took place around 13.6 Ma and deeply impacted the marine oxygen isotope record. Thisevent also profoundly impacted oceanographic and climatic patterns, eventually leading to the establishment of the modern ice-house world. In particular, East Antarctica became ice covered at that period. The rational behind the present study was to investigate the impact that this event had on shallow water systems in order to complement the deep-sea record and hence acquire a more global perspective on Miocene climate change.The Maltese Islands were investigated for trends in bulk-rock carbon and oxygen isotopes, as well as bulk-rock mineralogy, clay minerals analysisand organic geochemisty. Results showed that the mid Miocene cooling event deeply impacted sedimentation at that location by changing sedimentation from carbonate to clay-rich sediments. Moreover, it was discovered that each phase of Antarctic glaciation, not just the major mid Miocene event, resulted in higher terrigenous input on Malta. Mass accumulation rates revealed that thiswas linked to increased runoff during periods when Antarctica was glaciated, and thus that the carbonate sediments were “diluted” by clay-rich sediments.The model subsequently developed to explain this implies feedback from Antarctic glaciations creating cold, dense air masses that push the ITCZ Northward, thus increasing precipitation on the North African subcontinent.Increased precipitation (or stronger African monsoon) accelerated continental weathering and runoff, thus bringing more terrigenous sediment to the paleolocation of the slope sediments of Malta. Spectral analysis of

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John CM, Mutti M, Adatte T, 2003, Mixed carbonate-siliciclastic record on the North African margin (Malta) - coupling of weathering processes and mid Miocene climate, GEOLOGICAL SOCIETY OF AMERICA BULLETIN, Vol: 115, Pages: 217-229, ISSN: 0016-7606

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• Citations: 92

John CM, Föllmi KB, De Kaenel E, Adatte T, Steinmann P, Badertscher Cet al., 2002, Carbonaceous and phosphate-rich sediments of the Miocene Monterey Formation at El Capitan State Beach, California, USA, JOURNAL OF SEDIMENTARY RESEARCH, Vol: 72, Pages: 252-267, ISSN: 1527-1404

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• Citations: 30

John CM, Odom RW, 1997, Static secondary ion mass spectrometry (SSIMS) of biological compounds in tissue and tissue-like matrices, INTERNATIONAL JOURNAL OF MASS SPECTROMETRY, Vol: 161, Pages: 47-67, ISSN: 1387-3806

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• Citations: 22

JOHN CM, ODOM RW, SALVATI L, ANNAPRAGADA A, LU MYFet al., 1995, XPS AND TOF SIMS MICROANALYSIS OF A PEPTIDE POLYMER DRUG-DELIVERY DEVICE, ANALYTICAL CHEMISTRY, Vol: 67, Pages: 3871-3878, ISSN: 0003-2700

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• Citations: 17

OFFORD DA, JOHN CM, LINFORD MR, GRIFFIN JHet al., 1994, CONTACT-ANGLE GONIOMETRY, ELLIPSOMETRY, AND TIME-OF-FLIGHT SECONDARY-ION MASS-SPECTROMETRY OF GOLD SUPPORTED, MIXED SELF-ASSEMBLED MONOLAYERS FORMED FROM ALKYL MERCAPTANS, LANGMUIR, Vol: 10, Pages: 883-889, ISSN: 0743-7463

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• Citations: 73

RIEKE PC, TARASEVICH BJ, WOOD LL, ENGELHARD MH, BAER DR, FRYXELL GE, JOHN CM, LAKEN DA, JAEHNIG MCet al., 1994, SPATIALLY-RESOLVED MINERAL DEPOSITION ON PATTERNED SELF-ASSEMBLED MONOLAYERS, LANGMUIR, Vol: 10, Pages: 619-622, ISSN: 0743-7463

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• Citations: 101

OFFORD DA, JOHN CM, GRIFFIN JH, 1994, CONTACT-ANGLE GONIOMETRY, ELLIPSOMETRY, XPS, AND TOF-SIMS ANALYSIS OF GOLD-SUPPORTED, MIXED SELF-ASSEMBLED MONOLAYERS FORMED FROM MIXED DIALKYL DISULFIDES, LANGMUIR, Vol: 10, Pages: 761-766, ISSN: 0743-7463

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• Citations: 71