Carbon chemistry of ODP Leg 105 sites
The quantity and quality of organic carbon of Eocene to Holocene sediments from ODP Sites 645, 646, and 647 were investigated to reconstruct depositional environments. Results were based on organic-carbon and nitrogen determinations, Rock-Eval pyrolysis, and kerogen microscopy. The sediments at Site...
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1989
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Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.744883 https://doi.org/10.1594/PANGAEA.744883 |
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.744883 2024-09-15T17:56:57+00:00 Carbon chemistry of ODP Leg 105 sites Stein, Ruediger Littke, Ralf Stax, Rainer Welte, Dietrich Hugo MEDIAN LATITUDE: 62.707419 * MEDIAN LONGITUDE: -55.476296 * SOUTH-BOUND LATITUDE: 53.331300 * WEST-BOUND LONGITUDE: -64.656200 * NORTH-BOUND LATITUDE: 70.458000 * EAST-BOUND LONGITUDE: -45.262000 * DATE/TIME START: 1985-09-05T13:25:00 * DATE/TIME END: 1985-10-23T18:15:00 1989 application/zip, 6 datasets https://doi.pangaea.de/10.1594/PANGAEA.744883 https://doi.org/10.1594/PANGAEA.744883 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.744883 https://doi.org/10.1594/PANGAEA.744883 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Stein, Ruediger; Littke, Ralf; Stax, Rainer; Welte, Dietrich Hugo (1989): Quantity, provenance, and maturity of organic matter at ODP Sites 645, 646, and 647: implications for reconstruction of paleoenvironments in Baffin Bay and Labrador Sea during Tertiary and Quaternary time. In: Srivastava, SP; Arthur, M; Clement, B; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 105, 185-208, https://doi.org/10.2973/odp.proc.sr.105.154.1989 105-645B 105-645D 105-645E 105-646 105-647A Baffin Bay COMPCORE Composite Core DRILL Drilling/drill rig Joides Resolution Labrador Sea Leg105 North Atlantic Ocean Ocean Drilling Program ODP dataset publication series 1989 ftpangaea https://doi.org/10.1594/PANGAEA.74488310.2973/odp.proc.sr.105.154.1989 2024-08-21T00:02:25Z The quantity and quality of organic carbon of Eocene to Holocene sediments from ODP Sites 645, 646, and 647 were investigated to reconstruct depositional environments. Results were based on organic-carbon and nitrogen determinations, Rock-Eval pyrolysis, and kerogen microscopy. The sediments at Site 645 in Baffin Bay are characterized by relatively high organic-carbon values, most of which range from 0.5% to almost 3%, with maximum values in the middle Miocene. Distinct maxima of organic-carbon accumulation rates occur between 18 and 12.5 Ma and between 3.4 and 0 Ma. At Sites 646 and 647 in the Labrador Sea, organic-carbon contents vary between 0.1% and 0.75%. Cyclic 'Milankovitch-type' changes in organic-carbon deposition imply climate-controlled mechanisms that cause these fluctuations. The composition of organic matter at Site 645 is dominated by terrigenous components throughout the entire sediment sequence. An increased content of marine organic carbon was recorded only in the late-middle Miocene. At Sites 646 and 647, the origin of the organic matter most probably is marine. Oceanic paleoproductivity values were estimated, based on the amount of marine organic carbon. During most of the Neogene time interval at Site 645, productivity was low, i.e., similar or less than that measured in Baffin Bay today. Higher values of up to 150 (200) gC/m**2/y may have occurred only in the Miocene. At Sites 646 and 647, mean paleoproductivity values vary between 90 and 170 gC/m**2/y; i.e., these are also similar to those measured in the Labrador Sea today. Lower values of 40 to 70 gC/m**2/y were estimated for the early Eocene and (middle) Miocene. Other/Unknown Material Baffin Bay Baffin Bay Baffin Labrador Sea North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-64.656200,-45.262000,70.458000,53.331300) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
105-645B 105-645D 105-645E 105-646 105-647A Baffin Bay COMPCORE Composite Core DRILL Drilling/drill rig Joides Resolution Labrador Sea Leg105 North Atlantic Ocean Ocean Drilling Program ODP |
spellingShingle |
105-645B 105-645D 105-645E 105-646 105-647A Baffin Bay COMPCORE Composite Core DRILL Drilling/drill rig Joides Resolution Labrador Sea Leg105 North Atlantic Ocean Ocean Drilling Program ODP Stein, Ruediger Littke, Ralf Stax, Rainer Welte, Dietrich Hugo Carbon chemistry of ODP Leg 105 sites |
topic_facet |
105-645B 105-645D 105-645E 105-646 105-647A Baffin Bay COMPCORE Composite Core DRILL Drilling/drill rig Joides Resolution Labrador Sea Leg105 North Atlantic Ocean Ocean Drilling Program ODP |
description |
The quantity and quality of organic carbon of Eocene to Holocene sediments from ODP Sites 645, 646, and 647 were investigated to reconstruct depositional environments. Results were based on organic-carbon and nitrogen determinations, Rock-Eval pyrolysis, and kerogen microscopy. The sediments at Site 645 in Baffin Bay are characterized by relatively high organic-carbon values, most of which range from 0.5% to almost 3%, with maximum values in the middle Miocene. Distinct maxima of organic-carbon accumulation rates occur between 18 and 12.5 Ma and between 3.4 and 0 Ma. At Sites 646 and 647 in the Labrador Sea, organic-carbon contents vary between 0.1% and 0.75%. Cyclic 'Milankovitch-type' changes in organic-carbon deposition imply climate-controlled mechanisms that cause these fluctuations. The composition of organic matter at Site 645 is dominated by terrigenous components throughout the entire sediment sequence. An increased content of marine organic carbon was recorded only in the late-middle Miocene. At Sites 646 and 647, the origin of the organic matter most probably is marine. Oceanic paleoproductivity values were estimated, based on the amount of marine organic carbon. During most of the Neogene time interval at Site 645, productivity was low, i.e., similar or less than that measured in Baffin Bay today. Higher values of up to 150 (200) gC/m**2/y may have occurred only in the Miocene. At Sites 646 and 647, mean paleoproductivity values vary between 90 and 170 gC/m**2/y; i.e., these are also similar to those measured in the Labrador Sea today. Lower values of 40 to 70 gC/m**2/y were estimated for the early Eocene and (middle) Miocene. |
format |
Other/Unknown Material |
author |
Stein, Ruediger Littke, Ralf Stax, Rainer Welte, Dietrich Hugo |
author_facet |
Stein, Ruediger Littke, Ralf Stax, Rainer Welte, Dietrich Hugo |
author_sort |
Stein, Ruediger |
title |
Carbon chemistry of ODP Leg 105 sites |
title_short |
Carbon chemistry of ODP Leg 105 sites |
title_full |
Carbon chemistry of ODP Leg 105 sites |
title_fullStr |
Carbon chemistry of ODP Leg 105 sites |
title_full_unstemmed |
Carbon chemistry of ODP Leg 105 sites |
title_sort |
carbon chemistry of odp leg 105 sites |
publisher |
PANGAEA |
publishDate |
1989 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.744883 https://doi.org/10.1594/PANGAEA.744883 |
op_coverage |
MEDIAN LATITUDE: 62.707419 * MEDIAN LONGITUDE: -55.476296 * SOUTH-BOUND LATITUDE: 53.331300 * WEST-BOUND LONGITUDE: -64.656200 * NORTH-BOUND LATITUDE: 70.458000 * EAST-BOUND LONGITUDE: -45.262000 * DATE/TIME START: 1985-09-05T13:25:00 * DATE/TIME END: 1985-10-23T18:15:00 |
long_lat |
ENVELOPE(-64.656200,-45.262000,70.458000,53.331300) |
genre |
Baffin Bay Baffin Bay Baffin Labrador Sea North Atlantic |
genre_facet |
Baffin Bay Baffin Bay Baffin Labrador Sea North Atlantic |
op_source |
Supplement to: Stein, Ruediger; Littke, Ralf; Stax, Rainer; Welte, Dietrich Hugo (1989): Quantity, provenance, and maturity of organic matter at ODP Sites 645, 646, and 647: implications for reconstruction of paleoenvironments in Baffin Bay and Labrador Sea during Tertiary and Quaternary time. In: Srivastava, SP; Arthur, M; Clement, B; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 105, 185-208, https://doi.org/10.2973/odp.proc.sr.105.154.1989 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.744883 https://doi.org/10.1594/PANGAEA.744883 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.74488310.2973/odp.proc.sr.105.154.1989 |
_version_ |
1810433152579010560 |