(Table 1) Hydrocarbon geochemistry and biological markers in DSDP Holes 96-618, 96-618A and 96-619
The C15+ hydrocarbon geochemistry of sediments from Sites 618 and 619 (Orca and Pigmy basins) has been examined as part of a biogeochemical study of microbial activity and biological markers in Leg 96 sediments. Total hydrocarbon concentrations (13-78 µg/g dry weight) are elevated in comparison to t...
Main Authors: | , , |
---|---|
Format: | Dataset |
Language: | English |
Published: |
PANGAEA
1986
|
Subjects: | |
Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.788230 https://doi.org/10.1594/PANGAEA.788230 |
id |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.788230 |
---|---|
record_format |
openpolar |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.788230 2023-05-15T17:54:03+02:00 (Table 1) Hydrocarbon geochemistry and biological markers in DSDP Holes 96-618, 96-618A and 96-619 Requejo, A G Whelan, Jean K Boehm, Paul D MEDIAN LATITUDE: 27.072033 * MEDIAN LONGITUDE: -91.311133 * SOUTH-BOUND LATITUDE: 27.011300 * WEST-BOUND LONGITUDE: -91.409000 * NORTH-BOUND LATITUDE: 27.193500 * EAST-BOUND LONGITUDE: -91.262200 * DATE/TIME START: 1983-10-19T00:00:00 * DATE/TIME END: 1983-10-21T00:00:00 * MINIMUM DEPTH, sediment/rock: 4 m * MAXIMUM DEPTH, sediment/rock: 167 m 1986-09-05 text/tab-separated-values, 181 data points https://doi.pangaea.de/10.1594/PANGAEA.788230 https://doi.org/10.1594/PANGAEA.788230 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.788230 https://doi.org/10.1594/PANGAEA.788230 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Requejo, A G; Whelan, Jean K; Boehm, Paul D (1986): Hydrocarbon geochemistry and biological markers in Orca and Pigmy Basin sediments (Sites 618 and 619). In: Bouma, AH; Coleman, JM; Meyer, AW; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 96, 785-793, https://doi.org/10.2973/dsdp.proc.96.150.1986 96-618 96-618A 96-619 Carbon organic total Deep Sea Drilling Project DEPTH sediment/rock DOC/DON high temperature catalytic combustion DRILL Drilling/drill rig DSDP DSDP/ODP/IODP sample designation Elevation of event Event label Gas chromatography Glomar Challenger Gulf of Mexico Gulf of Mexico/BASIN Hydrocarbons Index Latitude of event Leg96 Longitude of event n-C17/n-C29 ratio Odd-even predominance index Organic matter extractable Perylene Pristane/Phytane ratio Sample code/label Dataset 1986 ftpangaea https://doi.org/10.1594/PANGAEA.788230 https://doi.org/10.2973/dsdp.proc.96.150.1986 2023-01-20T08:55:13Z The C15+ hydrocarbon geochemistry of sediments from Sites 618 and 619 (Orca and Pigmy basins) has been examined as part of a biogeochemical study of microbial activity and biological markers in Leg 96 sediments. Total hydrocarbon concentrations (13-78 µg/g dry weight) are elevated in comparison to those reported for Recent sediments from the Gulf of Mexico continental shelf, but there is little evidence that these sediments contain petroleum hydrocarbons originating from seepage. The presence of weathered fossil hydrocarbons is suggested, however, by the unresolved envelope feature observed in gas chromatograms of most sediments and also by the distribution of C27-C29 steranes and triterpanes. Normal alkane distributions are consistent with a predominant input or preservation of terrestrial organic matter in these offshore basins. At Site 619 an enhanced terrestrial contribution below 113 m sub-bottom is indicated by an increase in the ratio of odd to even n-alkanes over the range C26 to C30. Pristane/phytane ratios at both sites range between 0.97 and 1.74 which, in conjunction with the occurrence of significant concentrations of perylene (10-500 ng/g dry weight), suggest the prevalence of reducing depositional conditions over the time period covered by the cores. A hydrocarbon tentatively identified as a C25 multibranched compound similar to those found in Recent sediments was detected in most samples. Dataset Orca PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-91.409000,-91.262200,27.193500,27.011300) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
96-618 96-618A 96-619 Carbon organic total Deep Sea Drilling Project DEPTH sediment/rock DOC/DON high temperature catalytic combustion DRILL Drilling/drill rig DSDP DSDP/ODP/IODP sample designation Elevation of event Event label Gas chromatography Glomar Challenger Gulf of Mexico Gulf of Mexico/BASIN Hydrocarbons Index Latitude of event Leg96 Longitude of event n-C17/n-C29 ratio Odd-even predominance index Organic matter extractable Perylene Pristane/Phytane ratio Sample code/label |
spellingShingle |
96-618 96-618A 96-619 Carbon organic total Deep Sea Drilling Project DEPTH sediment/rock DOC/DON high temperature catalytic combustion DRILL Drilling/drill rig DSDP DSDP/ODP/IODP sample designation Elevation of event Event label Gas chromatography Glomar Challenger Gulf of Mexico Gulf of Mexico/BASIN Hydrocarbons Index Latitude of event Leg96 Longitude of event n-C17/n-C29 ratio Odd-even predominance index Organic matter extractable Perylene Pristane/Phytane ratio Sample code/label Requejo, A G Whelan, Jean K Boehm, Paul D (Table 1) Hydrocarbon geochemistry and biological markers in DSDP Holes 96-618, 96-618A and 96-619 |
topic_facet |
96-618 96-618A 96-619 Carbon organic total Deep Sea Drilling Project DEPTH sediment/rock DOC/DON high temperature catalytic combustion DRILL Drilling/drill rig DSDP DSDP/ODP/IODP sample designation Elevation of event Event label Gas chromatography Glomar Challenger Gulf of Mexico Gulf of Mexico/BASIN Hydrocarbons Index Latitude of event Leg96 Longitude of event n-C17/n-C29 ratio Odd-even predominance index Organic matter extractable Perylene Pristane/Phytane ratio Sample code/label |
description |
The C15+ hydrocarbon geochemistry of sediments from Sites 618 and 619 (Orca and Pigmy basins) has been examined as part of a biogeochemical study of microbial activity and biological markers in Leg 96 sediments. Total hydrocarbon concentrations (13-78 µg/g dry weight) are elevated in comparison to those reported for Recent sediments from the Gulf of Mexico continental shelf, but there is little evidence that these sediments contain petroleum hydrocarbons originating from seepage. The presence of weathered fossil hydrocarbons is suggested, however, by the unresolved envelope feature observed in gas chromatograms of most sediments and also by the distribution of C27-C29 steranes and triterpanes. Normal alkane distributions are consistent with a predominant input or preservation of terrestrial organic matter in these offshore basins. At Site 619 an enhanced terrestrial contribution below 113 m sub-bottom is indicated by an increase in the ratio of odd to even n-alkanes over the range C26 to C30. Pristane/phytane ratios at both sites range between 0.97 and 1.74 which, in conjunction with the occurrence of significant concentrations of perylene (10-500 ng/g dry weight), suggest the prevalence of reducing depositional conditions over the time period covered by the cores. A hydrocarbon tentatively identified as a C25 multibranched compound similar to those found in Recent sediments was detected in most samples. |
format |
Dataset |
author |
Requejo, A G Whelan, Jean K Boehm, Paul D |
author_facet |
Requejo, A G Whelan, Jean K Boehm, Paul D |
author_sort |
Requejo, A G |
title |
(Table 1) Hydrocarbon geochemistry and biological markers in DSDP Holes 96-618, 96-618A and 96-619 |
title_short |
(Table 1) Hydrocarbon geochemistry and biological markers in DSDP Holes 96-618, 96-618A and 96-619 |
title_full |
(Table 1) Hydrocarbon geochemistry and biological markers in DSDP Holes 96-618, 96-618A and 96-619 |
title_fullStr |
(Table 1) Hydrocarbon geochemistry and biological markers in DSDP Holes 96-618, 96-618A and 96-619 |
title_full_unstemmed |
(Table 1) Hydrocarbon geochemistry and biological markers in DSDP Holes 96-618, 96-618A and 96-619 |
title_sort |
(table 1) hydrocarbon geochemistry and biological markers in dsdp holes 96-618, 96-618a and 96-619 |
publisher |
PANGAEA |
publishDate |
1986 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.788230 https://doi.org/10.1594/PANGAEA.788230 |
op_coverage |
MEDIAN LATITUDE: 27.072033 * MEDIAN LONGITUDE: -91.311133 * SOUTH-BOUND LATITUDE: 27.011300 * WEST-BOUND LONGITUDE: -91.409000 * NORTH-BOUND LATITUDE: 27.193500 * EAST-BOUND LONGITUDE: -91.262200 * DATE/TIME START: 1983-10-19T00:00:00 * DATE/TIME END: 1983-10-21T00:00:00 * MINIMUM DEPTH, sediment/rock: 4 m * MAXIMUM DEPTH, sediment/rock: 167 m |
long_lat |
ENVELOPE(-91.409000,-91.262200,27.193500,27.011300) |
genre |
Orca |
genre_facet |
Orca |
op_source |
Supplement to: Requejo, A G; Whelan, Jean K; Boehm, Paul D (1986): Hydrocarbon geochemistry and biological markers in Orca and Pigmy Basin sediments (Sites 618 and 619). In: Bouma, AH; Coleman, JM; Meyer, AW; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 96, 785-793, https://doi.org/10.2973/dsdp.proc.96.150.1986 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.788230 https://doi.org/10.1594/PANGAEA.788230 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.788230 https://doi.org/10.2973/dsdp.proc.96.150.1986 |
_version_ |
1766161756584935424 |