Parnell, John: Isotopic composition of sulphur in pyrite from sediment core CRP-2A [dataset]. Geology & Petroleum Geology, University of Aberdeen, PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.761426 (unpublished dataset)
Project(s):
Cape Roberts Project (CRP)
Coverage:
Latitude: -77.005980 * Longitude: 163.719450
Date/Time Start: 1998-10-16T07:30:00 * Date/Time End: 1998-11-25T14:20:00
Minimum DEPTH, sediment/rock: 447.10 m * Maximum DEPTH, sediment/rock: 447.10 m
Event(s):
CRP-2A (14.2 km at 096° true from Cape Roberts) * Latitude: -77.005980 * Longitude: 163.719450 * Date/Time Start: 1998-10-16T07:30:00 * Date/Time End: 1998-11-25T14:20:00 * Elevation: -177.9 m * Recovery: 624 m * Location: off Cape Roberts, Ross Sea, Antarctica * Campaign: CRP-2 * Basis: Sampling/drilling from ice * Method/Device: Core wireline system (CWS) * Comment: 921 m at 284° from CRP-1. Sea-ice thickness: 2.0 m (1 Oct) to 2.2 m (23 Nov). Sea riser embedded to 13.03 mbsf. Lateral ice movement: 9.87 m to east from 17 Oct to 23 Nov. HQ core to 199.31 mbsf. NQ core to 624.15 mbsf. 13.03 to 45.97 mbsf, 11.29 m (34%) partially following CRP-2. 45.07 to 624.15 mbsf, 548.67 m (95%) new hole. Deepest core-lithology: hard sandy siltstone. Deepest core-age: earliest Oligocene (ca. 33 Ma on diatoms, nannofossils and dinoflagellates)
Comment:
Sample: pyrite, largely oxidized to gypsum. The pyrite is cementing sandstone, interpreted to be an injected sandstone.
Objective: as part of a larger survey of pyrite in injected sandstones, the pyrite was analysed for sulphur isotopic composition, to determine if microbial activity was involved in its precipitation. The analysis was done using standard methods at the Scottish Universities Environmental Research Centre, East Kilbride, Glasgow.
Interpretation: the very light composition, compared to Oligocene seawater (~+20 per mil), is strong evidence for precipitation by microbial sulphate reduction. The fractionation between the two of over 30 per mil exceeds the 20 per mil maximum likely from non-biological processes.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 2 | δ34S | δ34S | ‰ CDT | Parnell, John | ||
| 3 | Sample type | Samp type | Parnell, John |
Size:
2 data points