Geochemistry, lithology and maceral analysis at DSDP Hole 71-511, supplement to: von der Dick, Hans; Rullkötter, Jürgen; Welte, Dietrich Hugo (1983): Content, type, and thermal evolution of organic matter in sediments from the eastern Falkland Plateau, Deep Sea Drilling Project, Leg 71. In: Ludwig, WF; Krasheninnikov, VA; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Government Print Office), 71, 1015-1032
The quantity, type, and maturity of the organic matter in Recent through Upper Jurassic sediments from the Falkland Plateau, DSDP Site 511, have been determined. Sediments were investigated for their hydrocarbon potential by organic carbon and Rock-Eval pyrolysis. Kerogen concentrates were prepared...
Main Authors: | , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
PANGAEA - Data Publisher for Earth & Environmental Science
1983
|
Subjects: | |
Online Access: | https://dx.doi.org/10.1594/pangaea.815180 https://doi.pangaea.de/10.1594/PANGAEA.815180 |
id |
ftdatacite:10.1594/pangaea.815180 |
---|---|
record_format |
openpolar |
spelling |
ftdatacite:10.1594/pangaea.815180 2023-05-15T18:21:23+02:00 Geochemistry, lithology and maceral analysis at DSDP Hole 71-511, supplement to: von der Dick, Hans; Rullkötter, Jürgen; Welte, Dietrich Hugo (1983): Content, type, and thermal evolution of organic matter in sediments from the eastern Falkland Plateau, Deep Sea Drilling Project, Leg 71. In: Ludwig, WF; Krasheninnikov, VA; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Government Print Office), 71, 1015-1032 von der Dick, Hans Rullkötter, Jürgen Welte, Dietrich Hugo 1983 application/zip https://dx.doi.org/10.1594/pangaea.815180 https://doi.pangaea.de/10.1594/PANGAEA.815180 en eng PANGAEA - Data Publisher for Earth & Environmental Science https://dx.doi.org/10.2973/dsdp.proc.71.138.1983 Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 CC-BY Drilling/drill rig Leg71 Glomar Challenger Deep Sea Drilling Project DSDP Collection article Supplementary Collection of Datasets 1983 ftdatacite https://doi.org/10.1594/pangaea.815180 https://doi.org/10.2973/dsdp.proc.71.138.1983 2021-11-05T12:55:41Z The quantity, type, and maturity of the organic matter in Recent through Upper Jurassic sediments from the Falkland Plateau, DSDP Site 511, have been determined. Sediments were investigated for their hydrocarbon potential by organic carbon and Rock-Eval pyrolysis. Kerogen concentrates were prepared and analyzed in reflected and transmitted light to determine vitrinite reflectance and maceral content. Total extractable organic compounds were analyzed for their elemental composition, and the fraction of the nonaromatic hydrocarbons was determined by capillary column gas chromatography and combined gas chromatography/mass spectrometry. Three main classes of organic matter can be determined at DSDP Site 511 by a qualitative and quantitative evaluation of microscopic and geochemical results. The Upper Jurassic to lower Albian black shales contain high amounts of organic matter of dominantly marine origin. The content of terrigenous organic matter increases at the base of the black shales, whereas the shallowest black shales near the Aptian/Albian boundary are transitional in composition, with increasing amounts of inert, partly oxidized organic matter which is the dominant component in all Albian through Tertiary sediments investigated. The organic matter in the black shales has a low level of maturity and has not yet reached the onset of thermal hydrocarbon generation. This is demonstrated by the low amounts of total extractable organic compounds, low percentages of hydrocarbons, and the pattern and composition of nonaromatic hydrocarbons. The observed reflectance of huminite and vitrinite particles (between 0.4% and 0.5% Ro at bottom-hole depth of 632 m) is consistent with this interpretation. Several geochemical parameters indicate, however, a rapid increase in the maturation of organic matter with depth of burial. This appears to result from the relatively high heat flow observed at Site 511. If we relate the level of maturation of the black shales at the bottom of Hole 511 to their present shallow depth of burial, they appear rather mature. On the basis of comparisons with other sedimentary basins of a known geothermal history, a somewhat higher paleotemperature gradient and/or additional overburden are required to give the observed maturity at shallow depth. A comparison with contemporaneous sediments of DSDP Site 361, Cape Basin, which was the basin adjacent and to the north of the Falkland Plateau during the early stages of the South Atlantic Ocean, demonstrates differences in sedimentological features and in the nature of sedimentary organic matter. We interpret these differences to be the result of the different geological settings for Sites 361 and 511. Article in Journal/Newspaper South Atlantic Ocean DataCite Metadata Store (German National Library of Science and Technology) Falkland Plateau ENVELOPE(-50.000,-50.000,-51.000,-51.000) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
Drilling/drill rig Leg71 Glomar Challenger Deep Sea Drilling Project DSDP |
spellingShingle |
Drilling/drill rig Leg71 Glomar Challenger Deep Sea Drilling Project DSDP von der Dick, Hans Rullkötter, Jürgen Welte, Dietrich Hugo Geochemistry, lithology and maceral analysis at DSDP Hole 71-511, supplement to: von der Dick, Hans; Rullkötter, Jürgen; Welte, Dietrich Hugo (1983): Content, type, and thermal evolution of organic matter in sediments from the eastern Falkland Plateau, Deep Sea Drilling Project, Leg 71. In: Ludwig, WF; Krasheninnikov, VA; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Government Print Office), 71, 1015-1032 |
topic_facet |
Drilling/drill rig Leg71 Glomar Challenger Deep Sea Drilling Project DSDP |
description |
The quantity, type, and maturity of the organic matter in Recent through Upper Jurassic sediments from the Falkland Plateau, DSDP Site 511, have been determined. Sediments were investigated for their hydrocarbon potential by organic carbon and Rock-Eval pyrolysis. Kerogen concentrates were prepared and analyzed in reflected and transmitted light to determine vitrinite reflectance and maceral content. Total extractable organic compounds were analyzed for their elemental composition, and the fraction of the nonaromatic hydrocarbons was determined by capillary column gas chromatography and combined gas chromatography/mass spectrometry. Three main classes of organic matter can be determined at DSDP Site 511 by a qualitative and quantitative evaluation of microscopic and geochemical results. The Upper Jurassic to lower Albian black shales contain high amounts of organic matter of dominantly marine origin. The content of terrigenous organic matter increases at the base of the black shales, whereas the shallowest black shales near the Aptian/Albian boundary are transitional in composition, with increasing amounts of inert, partly oxidized organic matter which is the dominant component in all Albian through Tertiary sediments investigated. The organic matter in the black shales has a low level of maturity and has not yet reached the onset of thermal hydrocarbon generation. This is demonstrated by the low amounts of total extractable organic compounds, low percentages of hydrocarbons, and the pattern and composition of nonaromatic hydrocarbons. The observed reflectance of huminite and vitrinite particles (between 0.4% and 0.5% Ro at bottom-hole depth of 632 m) is consistent with this interpretation. Several geochemical parameters indicate, however, a rapid increase in the maturation of organic matter with depth of burial. This appears to result from the relatively high heat flow observed at Site 511. If we relate the level of maturation of the black shales at the bottom of Hole 511 to their present shallow depth of burial, they appear rather mature. On the basis of comparisons with other sedimentary basins of a known geothermal history, a somewhat higher paleotemperature gradient and/or additional overburden are required to give the observed maturity at shallow depth. A comparison with contemporaneous sediments of DSDP Site 361, Cape Basin, which was the basin adjacent and to the north of the Falkland Plateau during the early stages of the South Atlantic Ocean, demonstrates differences in sedimentological features and in the nature of sedimentary organic matter. We interpret these differences to be the result of the different geological settings for Sites 361 and 511. |
format |
Article in Journal/Newspaper |
author |
von der Dick, Hans Rullkötter, Jürgen Welte, Dietrich Hugo |
author_facet |
von der Dick, Hans Rullkötter, Jürgen Welte, Dietrich Hugo |
author_sort |
von der Dick, Hans |
title |
Geochemistry, lithology and maceral analysis at DSDP Hole 71-511, supplement to: von der Dick, Hans; Rullkötter, Jürgen; Welte, Dietrich Hugo (1983): Content, type, and thermal evolution of organic matter in sediments from the eastern Falkland Plateau, Deep Sea Drilling Project, Leg 71. In: Ludwig, WF; Krasheninnikov, VA; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Government Print Office), 71, 1015-1032 |
title_short |
Geochemistry, lithology and maceral analysis at DSDP Hole 71-511, supplement to: von der Dick, Hans; Rullkötter, Jürgen; Welte, Dietrich Hugo (1983): Content, type, and thermal evolution of organic matter in sediments from the eastern Falkland Plateau, Deep Sea Drilling Project, Leg 71. In: Ludwig, WF; Krasheninnikov, VA; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Government Print Office), 71, 1015-1032 |
title_full |
Geochemistry, lithology and maceral analysis at DSDP Hole 71-511, supplement to: von der Dick, Hans; Rullkötter, Jürgen; Welte, Dietrich Hugo (1983): Content, type, and thermal evolution of organic matter in sediments from the eastern Falkland Plateau, Deep Sea Drilling Project, Leg 71. In: Ludwig, WF; Krasheninnikov, VA; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Government Print Office), 71, 1015-1032 |
title_fullStr |
Geochemistry, lithology and maceral analysis at DSDP Hole 71-511, supplement to: von der Dick, Hans; Rullkötter, Jürgen; Welte, Dietrich Hugo (1983): Content, type, and thermal evolution of organic matter in sediments from the eastern Falkland Plateau, Deep Sea Drilling Project, Leg 71. In: Ludwig, WF; Krasheninnikov, VA; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Government Print Office), 71, 1015-1032 |
title_full_unstemmed |
Geochemistry, lithology and maceral analysis at DSDP Hole 71-511, supplement to: von der Dick, Hans; Rullkötter, Jürgen; Welte, Dietrich Hugo (1983): Content, type, and thermal evolution of organic matter in sediments from the eastern Falkland Plateau, Deep Sea Drilling Project, Leg 71. In: Ludwig, WF; Krasheninnikov, VA; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Government Print Office), 71, 1015-1032 |
title_sort |
geochemistry, lithology and maceral analysis at dsdp hole 71-511, supplement to: von der dick, hans; rullkötter, jürgen; welte, dietrich hugo (1983): content, type, and thermal evolution of organic matter in sediments from the eastern falkland plateau, deep sea drilling project, leg 71. in: ludwig, wf; krasheninnikov, va; et al. (eds.), initial reports of the deep sea drilling project, washington (u.s. government print office), 71, 1015-1032 |
publisher |
PANGAEA - Data Publisher for Earth & Environmental Science |
publishDate |
1983 |
url |
https://dx.doi.org/10.1594/pangaea.815180 https://doi.pangaea.de/10.1594/PANGAEA.815180 |
long_lat |
ENVELOPE(-50.000,-50.000,-51.000,-51.000) |
geographic |
Falkland Plateau |
geographic_facet |
Falkland Plateau |
genre |
South Atlantic Ocean |
genre_facet |
South Atlantic Ocean |
op_relation |
https://dx.doi.org/10.2973/dsdp.proc.71.138.1983 |
op_rights |
Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/pangaea.815180 https://doi.org/10.2973/dsdp.proc.71.138.1983 |
_version_ |
1766200612983144448 |