Harilaos Tsikos | Rhodes University (original) (raw)

Harilaos Tsikos

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Research paper thumbnail of Black shale deposition on the northwest African Shelf during the Cenomanian/Turonian oceanic anoxic event: Climate coupling and global organic carbon burial

Paleoceanography, 2005

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Research paper thumbnail of The use of carbon and oxygen stable isotopes in the study of global palaeoceanographic changes: examples from the Cretaceous sediment rocks of Western …

Proc. 1st Meeting C. …, Jan 1, 2005

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Research paper thumbnail of Fluctuations in Miocene climate and sea levels along the southwestern South African coast: inferences from biogeochemistry, palynology and sedimentology

The largest deposit of excellently preserved Mio-Pliocene vertebrate faunas in SouthAfrica is loc... more The largest deposit of excellently preserved Mio-Pliocene vertebrate faunas in SouthAfrica is located at the well known Langebaanweg (LBW) site along South Africa’s west coast in the southwestern Cape. This research deals with a core (BH2) drilled at Langebaanweg ‘E’ Quarry, which captures Miocene fluvial deposits that unconformably underlie the Mio-Pliocene deposits. The aim of the study is to constrain fluctuations in climate and ecosystems in the region during the Miocene, using a combination of sedimentology, palynology, and biogeochemistry. The latter is a novel application and includes bulk C and N isotope measurements as well as branched GDGT (glycerol dialkyl glycerol tetraether) membrane lipid compositions of the organic fraction of the core. The mean annual temperature (MAT) at time of deposition and ambient pH values were calculated using the Methylation index of Branched Tetraethers (MBT) and Cyclization ratio of Branched Tetraethers (CBT) proxies. The core samples analy...

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Research paper thumbnail of Tokyoite and As-rich tokyoite: new occurrence in the manganese ore of the Postmasburg Manganese Field, South Africa

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Research paper thumbnail of Black shale deposition on the northwest African Shelf during the Cenomanian/Turonian oceanic anoxic event: Climate coupling and global organic carbon burial

Paleoceanography, 2005

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Research paper thumbnail of Miocene climate and vegetation changes in the Cape Peninsula, South Africa: Evidence from biogeochemistry and palynology

Organic material from the Noordhoek area on the western margin of the Cape Peninsula, South Afric... more Organic material from the Noordhoek area on the western margin of the Cape Peninsula, South Africa, was obtained from a ~ 50 m-long drill-core dominated by fluvio-lacustrine siliciclastic sediments. The aim of this study is to constrain fluctuations in climate and the decline of tropical vegetation elements along the southwestern coast and the Cape Peninsula of South Africa, during the Late Cenozoic phase, when the Benguela upwelling system was established. The approach was to combine palynological, biogeochemical (tetraether lipids) and stable isotope (C, N) studies of the organic-bearing record from the Noordhoek area on the western margin of the Cape Peninsula. Bulk C and N isotope data of sediment organic matter, point to a predominantly C 3 higher plant source vegetation. Mean annual air temperature (MAT) from the analyses of tetraether lipids (MBT′–CBT index) was compared with palynomorphs from partly unpublished data of a previously drilled core adjacent to the study site. The palynomorphs are of subtropical affinities, and suggest that an open riparian forest would have existed in the early to middle Miocene of the southwestern coast of South Africa. Together these data sources allow vegetation and climate reconstructions of subtropical conditions during the early to middle Miocene, which comprised fluctuating open riparian forest and swamp vegetation. Temperatures rose in the middle Miocene and were higher than those of the present day.

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Research paper thumbnail of Carbon-isotope stratigraphy recorded by the Cenomanian-Turonian Oceanic Anoxic Event: correlation and implications based on three key localities

Journal of the Geological Society, 2005

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Research paper thumbnail of Organic-carbon deposition in the Cretaceous of the Ionian Basin, NW Greece: the Paquier Event (OAE 1b) revisited

Geological Magazine, 2004

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Research paper thumbnail of Carbon-isotope stratigraphy recorded by the Cenomanian-Turonian Oceanic Anoxic Event: correlation and implications based on three key localities

Journal of the Geological Society, 2005

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Research paper thumbnail of Nitrate reduction, sulfate reduction, and sedimentary iron isotope evolution during the Cenomanian-Turonian oceanic anoxic event

Paleoceanography, 2007

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Research paper thumbnail of Carbon-isotope stratigraphy of the Cenomanian-Turonian Oceanic Anoxic Event: correlation and implications based on three key-localities

Journal of The Geological Society, 2004

We present new, detailed carbon-isotope records for bulk carbonate, total organic carbon (TOC) an... more We present new, detailed carbon-isotope records for bulk carbonate, total organic carbon (TOC) and phytane from three key sections spanning the Cenomanian-Turonian boundary interval (Eastbourne, England; Gubbio, Italy; Tarfaya, Morocco), with the purpose of establishing a common chemostratigraphic framework for Oceanic Anoxic Event (OAE) 2. Isotope curves from all localities are characterized by a positive carbon-isotope excursion of c. 4‰

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Research paper thumbnail of First evidence for the Cenomanian–Turonian oceanic anoxic event (OAE2, ‘Bonarelli’ event) from the Ionian Zone, western continental Greece

International Journal of Earth Sciences, 2006

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Research paper thumbnail of No evidence for large-scale thermogenic methane release by the Karoo-Ferrar large igneous province

2007 GSA Denver Annual Meeting (28–31 October 2007). Paper No. 111-31, Presentation Time: 1:30 PM... more 2007 GSA Denver Annual Meeting (28–31 October 2007). Paper No. 111-31, Presentation Time: 1:30 PM-5:30 PM. NO EVIDENCE FOR LARGE-SCALE THERMOGENIC METHANE RELEASE BY THE KAROO-FERRAR LARGE IGNEOUS PROVINCE. ...

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Research paper thumbnail of Mechanisms of black shale deposition at the NW African shelf during the Cenomanian/Turonian oceanic anoxic event: implications for climate coupling and global organic carbon burial

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Research paper thumbnail of Black shale deposition on the northwest African Shelf during the Cenomanian/Turonian oceanic anoxic event: Climate coupling and global organic carbon burial

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Tokyoite and As-rich tokyoite: new occurrence in the manganese ore of the Postmasburg Manganese Field, South Africa

Bookmarks Related papers MentionsView impact

Research paper thumbnail of The Mineralogy and Geochemistry of the Voëlwater Banded Iron-formation, Northern Cape Province

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Research paper thumbnail of A review of fluid-rock interaction processes in the Kalahari manganese field, South Africa, using host-rock stable isotope geochemistry

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Research paper thumbnail of Low δ57Fe values record the onset of Palaeoproterozoic bacterial manganese reduction

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Research paper thumbnail of Hydrothermal aegirine from the Palaeoproterozoic Hotazel iron-formation, Kalahari Manganese Field, South Africa, and its possible implications

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Research paper thumbnail of Black shale deposition on the northwest African Shelf during the Cenomanian/Turonian oceanic anoxic event: Climate coupling and global organic carbon burial

Paleoceanography, 2005

Bookmarks Related papers MentionsView impact

Research paper thumbnail of The use of carbon and oxygen stable isotopes in the study of global palaeoceanographic changes: examples from the Cretaceous sediment rocks of Western …

Proc. 1st Meeting C. …, Jan 1, 2005

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Fluctuations in Miocene climate and sea levels along the southwestern South African coast: inferences from biogeochemistry, palynology and sedimentology

The largest deposit of excellently preserved Mio-Pliocene vertebrate faunas in SouthAfrica is loc... more The largest deposit of excellently preserved Mio-Pliocene vertebrate faunas in SouthAfrica is located at the well known Langebaanweg (LBW) site along South Africa’s west coast in the southwestern Cape. This research deals with a core (BH2) drilled at Langebaanweg ‘E’ Quarry, which captures Miocene fluvial deposits that unconformably underlie the Mio-Pliocene deposits. The aim of the study is to constrain fluctuations in climate and ecosystems in the region during the Miocene, using a combination of sedimentology, palynology, and biogeochemistry. The latter is a novel application and includes bulk C and N isotope measurements as well as branched GDGT (glycerol dialkyl glycerol tetraether) membrane lipid compositions of the organic fraction of the core. The mean annual temperature (MAT) at time of deposition and ambient pH values were calculated using the Methylation index of Branched Tetraethers (MBT) and Cyclization ratio of Branched Tetraethers (CBT) proxies. The core samples analy...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Tokyoite and As-rich tokyoite: new occurrence in the manganese ore of the Postmasburg Manganese Field, South Africa

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Black shale deposition on the northwest African Shelf during the Cenomanian/Turonian oceanic anoxic event: Climate coupling and global organic carbon burial

Paleoceanography, 2005

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Miocene climate and vegetation changes in the Cape Peninsula, South Africa: Evidence from biogeochemistry and palynology

Organic material from the Noordhoek area on the western margin of the Cape Peninsula, South Afric... more Organic material from the Noordhoek area on the western margin of the Cape Peninsula, South Africa, was obtained from a ~ 50 m-long drill-core dominated by fluvio-lacustrine siliciclastic sediments. The aim of this study is to constrain fluctuations in climate and the decline of tropical vegetation elements along the southwestern coast and the Cape Peninsula of South Africa, during the Late Cenozoic phase, when the Benguela upwelling system was established. The approach was to combine palynological, biogeochemical (tetraether lipids) and stable isotope (C, N) studies of the organic-bearing record from the Noordhoek area on the western margin of the Cape Peninsula. Bulk C and N isotope data of sediment organic matter, point to a predominantly C 3 higher plant source vegetation. Mean annual air temperature (MAT) from the analyses of tetraether lipids (MBT′–CBT index) was compared with palynomorphs from partly unpublished data of a previously drilled core adjacent to the study site. The palynomorphs are of subtropical affinities, and suggest that an open riparian forest would have existed in the early to middle Miocene of the southwestern coast of South Africa. Together these data sources allow vegetation and climate reconstructions of subtropical conditions during the early to middle Miocene, which comprised fluctuating open riparian forest and swamp vegetation. Temperatures rose in the middle Miocene and were higher than those of the present day.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Carbon-isotope stratigraphy recorded by the Cenomanian-Turonian Oceanic Anoxic Event: correlation and implications based on three key localities

Journal of the Geological Society, 2005

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Organic-carbon deposition in the Cretaceous of the Ionian Basin, NW Greece: the Paquier Event (OAE 1b) revisited

Geological Magazine, 2004

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Carbon-isotope stratigraphy recorded by the Cenomanian-Turonian Oceanic Anoxic Event: correlation and implications based on three key localities

Journal of the Geological Society, 2005

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Nitrate reduction, sulfate reduction, and sedimentary iron isotope evolution during the Cenomanian-Turonian oceanic anoxic event

Paleoceanography, 2007

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Carbon-isotope stratigraphy of the Cenomanian-Turonian Oceanic Anoxic Event: correlation and implications based on three key-localities

Journal of The Geological Society, 2004

We present new, detailed carbon-isotope records for bulk carbonate, total organic carbon (TOC) an... more We present new, detailed carbon-isotope records for bulk carbonate, total organic carbon (TOC) and phytane from three key sections spanning the Cenomanian-Turonian boundary interval (Eastbourne, England; Gubbio, Italy; Tarfaya, Morocco), with the purpose of establishing a common chemostratigraphic framework for Oceanic Anoxic Event (OAE) 2. Isotope curves from all localities are characterized by a positive carbon-isotope excursion of c. 4‰

Bookmarks Related papers MentionsView impact

Research paper thumbnail of First evidence for the Cenomanian–Turonian oceanic anoxic event (OAE2, ‘Bonarelli’ event) from the Ionian Zone, western continental Greece

International Journal of Earth Sciences, 2006

Bookmarks Related papers MentionsView impact

Research paper thumbnail of No evidence for large-scale thermogenic methane release by the Karoo-Ferrar large igneous province

2007 GSA Denver Annual Meeting (28–31 October 2007). Paper No. 111-31, Presentation Time: 1:30 PM... more 2007 GSA Denver Annual Meeting (28–31 October 2007). Paper No. 111-31, Presentation Time: 1:30 PM-5:30 PM. NO EVIDENCE FOR LARGE-SCALE THERMOGENIC METHANE RELEASE BY THE KAROO-FERRAR LARGE IGNEOUS PROVINCE. ...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Mechanisms of black shale deposition at the NW African shelf during the Cenomanian/Turonian oceanic anoxic event: implications for climate coupling and global organic carbon burial

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Black shale deposition on the northwest African Shelf during the Cenomanian/Turonian oceanic anoxic event: Climate coupling and global organic carbon burial

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Tokyoite and As-rich tokyoite: new occurrence in the manganese ore of the Postmasburg Manganese Field, South Africa

Bookmarks Related papers MentionsView impact

Research paper thumbnail of The Mineralogy and Geochemistry of the Voëlwater Banded Iron-formation, Northern Cape Province

Bookmarks Related papers MentionsView impact

Research paper thumbnail of A review of fluid-rock interaction processes in the Kalahari manganese field, South Africa, using host-rock stable isotope geochemistry

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Low δ57Fe values record the onset of Palaeoproterozoic bacterial manganese reduction

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Hydrothermal aegirine from the Palaeoproterozoic Hotazel iron-formation, Kalahari Manganese Field, South Africa, and its possible implications

Bookmarks Related papers MentionsView impact

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