Lebeaupin, Karim: Grain-size distributions and bulk mineralogical composition of marine sediment core MD07-3119 from the Southeastern Pacific Ocean [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.996205 (dataset in review)
Abstract:
This dataset details grain size and bulk mineralogy from marine sediment core MD07-3119, collected in the Southeastern Pacific (-46.083167°N, -76.099833°E) at 2523 m water depth during cruise MD159 (IMAGES XV - Pachiderme). The combined dataset spans depth intervals from 541 cm to 3245 cm, corresponding to 16 to 42 ka cal BP (calculated using the age-depth model from Andrzejewski et al. (2026), submitted, and Lebeaupin et al. (in prep.), submitted). A total of 161 samples (every 10-20 cm) were analysed.
Grain-size data were obtained using a Malvern Mastersizer 3000 laser-diffraction particle-size analyser equipped with a Hydro LV dispersion unit. To isolate terrigenous material, samples underwent sequential chemical treatments to remove organic matter using 35% hydrogen peroxide (10 mL), carbonates with 10% hydrochloric acid (5 mL), and biogenic silica with 2 N sodium hydroxide (5 mL). After these treatments, 2% sodium hexametaphosphate (5 mL) was added to achieve complete particle disaggregation. During analysis, a stirrer set to 1000 rpm was used to maintain sample suspension, and continuous ultrasounds were applied. Grain-size distributions were determined from three consecutive 20-second runs, and modal values were calculated using Mastersizer v3.88. The mean grain size was calculated using the Gradistat v9.1 software (Blott and Pye, 2001). The mean grain size was calculated on the <150 um fraction only (Mean w/o IRD).
Semi-quantitative relative abundances (%) of Quartz, Plagioclase, Illite, Kaolinite, Calcite, K-feldspar, Amphibole, Olivine, and Pyroxene were analysed using a Bruker D8 Advance X-ray Diffractometer (XRD). Powdered samples were prepared by grinding to a fine, homogeneous size to ensure accurate phase identification and quantification. The powders were mounted as unoriented mounts to minimise diffraction bias and subsequently scanned by XRD over the 2θ range of 5° to 70°. Mineral identification and semi-quantitative analysis were performed using the DIFFRAC.EVA software. Semi-quantitative abundances were estimated (±5 wt. %) using the Reference Intensity Ratio (RIR) method, following Cook et al. (1975).
References:
Blott, Simon J; Pye, Kenneth (2001): GRADISTAT: a grain size distribution and statistics package for the analysis of unconsolidated sediments. Earth Surface Processes and Landforms, 26(11), 1237-1248, https://doi.org/10.1002/esp.261
Funding:
Agence Nationale de la Recherche (ANR), grant/award no. 17-EURE-0006: Institut Pierre-Simon Laplace (IPSL) Climate Graduate School,
Agence Nationale de la Recherche (ANR), grant/award no. ANR-11-IDEX-0004: Institut Pierre-Simon Laplace (IPSL) Climate Graduate School
Coverage:
Latitude: -46.083167 * Longitude: -76.099833
Date/Time Start: 2007-02-21T11:29:00 * Date/Time End: 2007-02-21T11:29:00
Minimum DEPTH, sediment/rock: 5.41 m * Maximum DEPTH, sediment/rock: 32.45 m
Event(s):
MD07-3119 * Latitude: -46.083167 * Longitude: -76.099833 * Date/Time: 2007-02-21T11:29:00 * Elevation: -2523.0 m * Recovery: 32.54 m * Campaign: MD159 (IMAGES XV - Pachiderme) * Basis: Marion Dufresne (1995) * Method/Device: Calypso Corer II (CALYPSO2)
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DEPTH, sediment/rock | Depth sed | m | Lebeaupin, Karim | Geocode | |
| 2 | AGE | Age | ka BP | Lebeaupin, Karim | Age, calibrated | Geocode |
| 3 | Size fraction < 0.150 mm | <150 µm | % | Lebeaupin, Karim | Grain size, Mastersizer 3000, Malvern Instrument Inc.; Statistical analysis with GRADISTAT package (Blott and Pye, 2001) | Mean grain size of the terrigenous fraction (excluding ice-rafted debris) |
| 4 | Quartz | Qz | % | Lebeaupin, Karim | X-Ray Diffractometer, Bruker Corporation, D8 ADVANCE; followed by data processing software DIFFRAC.EVA | |
| 5 | Plagioclase | Pl | % | Lebeaupin, Karim | X-Ray Diffractometer, Bruker Corporation, D8 ADVANCE; followed by data processing software DIFFRAC.EVA | |
| 6 | Illite | Ill | % | Lebeaupin, Karim | X-Ray Diffractometer, Bruker Corporation, D8 ADVANCE; followed by data processing software DIFFRAC.EVA | |
| 7 | Kaolinite | Kln | % | Lebeaupin, Karim | X-Ray Diffractometer, Bruker Corporation, D8 ADVANCE; followed by data processing software DIFFRAC.EVA | |
| 8 | Calcite | Cal | % | Lebeaupin, Karim | X-Ray Diffractometer, Bruker Corporation, D8 ADVANCE; followed by data processing software DIFFRAC.EVA | |
| 9 | Kalifeldspar | Kfs | % | Lebeaupin, Karim | X-Ray Diffractometer, Bruker Corporation, D8 ADVANCE; followed by data processing software DIFFRAC.EVA | |
| 10 | Amphibole | Amp | % | Lebeaupin, Karim | X-Ray Diffractometer, Bruker Corporation, D8 ADVANCE; followed by data processing software DIFFRAC.EVA | |
| 11 | Olivine | Ol | % | Lebeaupin, Karim | X-Ray Diffractometer, Bruker Corporation, D8 ADVANCE; followed by data processing software DIFFRAC.EVA | |
| 12 | Pyroxene | Pyrox | % | Lebeaupin, Karim | X-Ray Diffractometer, Bruker Corporation, D8 ADVANCE; followed by data processing software DIFFRAC.EVA |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0) (License comes into effect after moratorium ends)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
1610 data points