Harilaos Tsikos | Rhodes University (original) (raw)
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Papers by Harilaos Tsikos
Paleoceanography, 2005
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Proc. 1st Meeting C. …, Jan 1, 2005
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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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Paleoceanography, 2005
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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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Journal of the Geological Society, 2005
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Geological Magazine, 2004
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Journal of the Geological Society, 2005
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Paleoceanography, 2007
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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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International Journal of Earth Sciences, 2006
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2007 GSA Denver Annual Meeting (2831 October 2007). Paper No. 111-31, Presentation Time: 1:30 PM... more 2007 GSA Denver Annual Meeting (2831 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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Paleoceanography, 2005
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Proc. 1st Meeting C. …, Jan 1, 2005
Bookmarks Related papers MentionsView impact
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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Paleoceanography, 2005
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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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Journal of the Geological Society, 2005
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Geological Magazine, 2004
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Journal of the Geological Society, 2005
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Paleoceanography, 2007
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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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International Journal of Earth Sciences, 2006
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2007 GSA Denver Annual Meeting (2831 October 2007). Paper No. 111-31, Presentation Time: 1:30 PM... more 2007 GSA Denver Annual Meeting (2831 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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