Rapid paleoenvironmental variations in NE Brazil during the Lateglacial : insights from TpS2, S3CO2 and S3CO Rock Eval parameters
The Rock-Eval pyrolysis technique was first developed as a rapid mean for evaluating the petroleum potential of source rocks, via the measurement of bulk organic parameters such as Total Organic Carbon (TOC), Hydrogen Index (HI), Oxygen Index (OI) and the maximum pyrolysis temperature Tmax (Espitali...
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ftird:oai:ird.fr:fdi:010067892 2024-09-15T18:12:03+00:00 Rapid paleoenvironmental variations in NE Brazil during the Lateglacial : insights from TpS2, S3CO2 and S3CO Rock Eval parameters Jacob, J. Disnar, J.R. Boussafir, M. Kéravis, D. /Sifeddine, Abdelfettah Spadano Albuquerque, A.L. /Turcq, Bruno BRESIL 2005 https://www.documentation.ird.fr/hor/fdi:010067892 EN eng https://www.documentation.ird.fr/hor/fdi:010067892 oai:ird.fr:fdi:010067892 Jacob J., Disnar J.R., Boussafir M., Kéravis D., Sifeddine Abdelfettah, Spadano Albuquerque A.L., Turcq Bruno. Rapid paleoenvironmental variations in NE Brazil during the Lateglacial : insights from TpS2, S3CO2 and S3CO Rock Eval parameters. 2005, 2 p. IMOG meeting, Séville (SPA), 2005 text 2005 ftird 2024-08-15T05:57:43Z The Rock-Eval pyrolysis technique was first developed as a rapid mean for evaluating the petroleum potential of source rocks, via the measurement of bulk organic parameters such as Total Organic Carbon (TOC), Hydrogen Index (HI), Oxygen Index (OI) and the maximum pyrolysis temperature Tmax (Espitalié et al., 1985; Lafargue et al., 1998). This method was then used to rapidly estimate organic matter quality and quantity in sedimentary series for paleoenvironmental studies (Talbot and Livingston, 1989). Recently, it has been proposed that there could be more information gained from the Rock-Eval parameters (Disnar et al., 2003). When considering also the recent analytical developments available from the Turbo6 version of the apparatus, there is a large field of investigation that remains unexplored in paleoenvironmental studies. Here we present results from the sedimentary infill of Lagoa do Caçó (Northern Brazil) that records paleoenvironmental changes since the Last Glacial Maximum (Jacob et al., 2004). The present study focuses on the Lateglacial interval (ca. 17,000 to 11,000 cal yrs BP), a time period where different Rock-Eval parameters such as TpS2 (Tmax equivalent), HI and OI produce controversial information. In order to better understand the meaning of these parameters, we propose an original mean of obtaining more pertinent information. S3CO2/S3CO ratio and TpS2 surprisingly display similar trends over the considered period, in two different cores. Furthermore, the evolution of these parameters is comparable with that of ?18O in the ice core record of Sajama (Bolivia) during the Lateglacial (Figure 1). Although the significance of these parameters and the origin of these variations remain to be cleared, our results confirm a pattern of rapid climate variability over the South American Tropics during the last deglaciation, as seen in the Northern Hemisphere. Text ice core IRD (Institute de recherche pour le développement): Horizon |
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IRD (Institute de recherche pour le développement): Horizon |
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English |
description |
The Rock-Eval pyrolysis technique was first developed as a rapid mean for evaluating the petroleum potential of source rocks, via the measurement of bulk organic parameters such as Total Organic Carbon (TOC), Hydrogen Index (HI), Oxygen Index (OI) and the maximum pyrolysis temperature Tmax (Espitalié et al., 1985; Lafargue et al., 1998). This method was then used to rapidly estimate organic matter quality and quantity in sedimentary series for paleoenvironmental studies (Talbot and Livingston, 1989). Recently, it has been proposed that there could be more information gained from the Rock-Eval parameters (Disnar et al., 2003). When considering also the recent analytical developments available from the Turbo6 version of the apparatus, there is a large field of investigation that remains unexplored in paleoenvironmental studies. Here we present results from the sedimentary infill of Lagoa do Caçó (Northern Brazil) that records paleoenvironmental changes since the Last Glacial Maximum (Jacob et al., 2004). The present study focuses on the Lateglacial interval (ca. 17,000 to 11,000 cal yrs BP), a time period where different Rock-Eval parameters such as TpS2 (Tmax equivalent), HI and OI produce controversial information. In order to better understand the meaning of these parameters, we propose an original mean of obtaining more pertinent information. S3CO2/S3CO ratio and TpS2 surprisingly display similar trends over the considered period, in two different cores. Furthermore, the evolution of these parameters is comparable with that of ?18O in the ice core record of Sajama (Bolivia) during the Lateglacial (Figure 1). Although the significance of these parameters and the origin of these variations remain to be cleared, our results confirm a pattern of rapid climate variability over the South American Tropics during the last deglaciation, as seen in the Northern Hemisphere. |
format |
Text |
author |
Jacob, J. Disnar, J.R. Boussafir, M. Kéravis, D. /Sifeddine, Abdelfettah Spadano Albuquerque, A.L. /Turcq, Bruno |
spellingShingle |
Jacob, J. Disnar, J.R. Boussafir, M. Kéravis, D. /Sifeddine, Abdelfettah Spadano Albuquerque, A.L. /Turcq, Bruno Rapid paleoenvironmental variations in NE Brazil during the Lateglacial : insights from TpS2, S3CO2 and S3CO Rock Eval parameters |
author_facet |
Jacob, J. Disnar, J.R. Boussafir, M. Kéravis, D. /Sifeddine, Abdelfettah Spadano Albuquerque, A.L. /Turcq, Bruno |
author_sort |
Jacob, J. |
title |
Rapid paleoenvironmental variations in NE Brazil during the Lateglacial : insights from TpS2, S3CO2 and S3CO Rock Eval parameters |
title_short |
Rapid paleoenvironmental variations in NE Brazil during the Lateglacial : insights from TpS2, S3CO2 and S3CO Rock Eval parameters |
title_full |
Rapid paleoenvironmental variations in NE Brazil during the Lateglacial : insights from TpS2, S3CO2 and S3CO Rock Eval parameters |
title_fullStr |
Rapid paleoenvironmental variations in NE Brazil during the Lateglacial : insights from TpS2, S3CO2 and S3CO Rock Eval parameters |
title_full_unstemmed |
Rapid paleoenvironmental variations in NE Brazil during the Lateglacial : insights from TpS2, S3CO2 and S3CO Rock Eval parameters |
title_sort |
rapid paleoenvironmental variations in ne brazil during the lateglacial : insights from tps2, s3co2 and s3co rock eval parameters |
publishDate |
2005 |
url |
https://www.documentation.ird.fr/hor/fdi:010067892 |
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BRESIL |
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ice core |
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ice core |
op_relation |
https://www.documentation.ird.fr/hor/fdi:010067892 oai:ird.fr:fdi:010067892 Jacob J., Disnar J.R., Boussafir M., Kéravis D., Sifeddine Abdelfettah, Spadano Albuquerque A.L., Turcq Bruno. Rapid paleoenvironmental variations in NE Brazil during the Lateglacial : insights from TpS2, S3CO2 and S3CO Rock Eval parameters. 2005, 2 p. IMOG meeting, Séville (SPA), 2005 |
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1810449635876012032 |