Dumitrescu, Mirela; Brassell, Simon C (2005): Biomarkers of early Aptian sediments of the Shatsky Rise [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.763250, Supplement to: Dumitrescu, M; Brassell, SC (2005): Biogeochemical assessment of sources of organic matter and paleoproductivity during the early Aptian Oceanic Anoxic Event at Shatsky Rise, ODP Leg 198. Organic Geochemistry, 36(7), 1002-1022, https://doi.org/10.1016/j.orggeochem.2005.03.001
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Abstract:
This study investigates organic-rich sedimentary sequences deposited during the early Aptian Oceanic Anoxic Event (OAE1a) at Sites 1207 and 1213 on Shatsky Rise (ODP Leg 198) in the west-central Pacific. Biomarker analyses provide evidence of the algal and bacterial origin of organic matter (OM) in these sediments where the abundance of steroidal components, particularly sterenes and sterones, suggests that the OM includes major contributions from eukaryotic sources in an environment characterized by high phytoplankton productivity. The presence of alkenones at Site 1213B is diagnostic of OM derived from representatives of haptophyte algae among the calcareous nannoplankton and their d13C values (average -31.6 per mil) are consistent with those expected during elevated pCO2. The occurrence and prominence of 2b-methylhopanes and 2b-methylhopanones indicates significant contributions to the OM from cyanobacteria, which are also likely contributors of hopanoids based on their d13C compositions. These biomarker data suggest that oceanic conditions, perhaps nitrate- or iron-limited, were conducive to cyanobacteria production during OAE1a, which appears to distinguish this event from other Cretaceous OAE.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 34.496317 * Median Longitude: 159.854578 * South-bound Latitude: 31.577630 * West-bound Longitude: 157.297700 * North-bound Latitude: 37.790610 * East-bound Longitude: 162.750880
Date/Time Start: 2001-09-09T00:15:00 * Date/Time End: 2001-10-15T00:30:00
Event(s):
198-1207B * Latitude: 37.790610 * Longitude: 162.750880 * Date/Time Start: 2001-09-09T00:15:00 * Date/Time End: 2001-09-13T23:30:00 * Elevation: -3100.7 m * Penetration: 622.8 m * Recovery: 60.22 m * Location: North Pacific Ocean * Campaign: Leg198 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 49 cores; 465.8 m cored; 157 m drilled; 12.9 % recovery
198-1213B * Latitude: 31.577630 * Longitude: 157.297700 * Date/Time Start: 2001-10-04T03:00:00 * Date/Time End: 2001-10-09T19:00:00 * Elevation: -3882.6 m * Penetration: 494.4 m * Recovery: 60.46 m * Location: North Pacific Ocean * Campaign: Leg198 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 33 cores; 304.7 m cored; 189.7 m drilled; 19.8 % recovery
198-1214A * Latitude: 31.867080 * Longitude: 157.478610 * Date/Time Start: 2001-10-12T04:15:00 * Date/Time End: 2001-10-15T00:30:00 * Elevation: -3401.6 m * Penetration: 235.9 m * Recovery: 16.49 m * Location: North Pacific Ocean * Campaign: Leg198 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 25 cores; 235.9 m cored; 0 m drilled; 7 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
3 datasets
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Datasets listed in this publication series
- Dumitrescu, M; Brassell, SC (2005): (Table 3) Dominant biomarkers in organic-rich lower Aptian sediments from Shatsky Rise. https://doi.org/10.1594/PANGAEA.763248
- Dumitrescu, M; Brassell, SC (2005): (Table 4) Selected biomarker ratios for organic-rich lower Aptian sediments from Shatsky Rise. https://doi.org/10.1594/PANGAEA.763249
- Dumitrescu, M; Brassell, SC (2005): (Table 1) Elemental and isotopic composition and hydrogen and oxygen indices of ODP Leg 198 holes. https://doi.org/10.1594/PANGAEA.763247