de.pangaea.dataset973164 und de.pangaea.dataset973162 dataset PANGAEA

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https://www.pangaea.de/ information pointOfContact 2025-11-08T05:32:49Z https://doi.pangaea.de/10.1594/PANGAEA.973164 2024-11-11T07:07:57 publication https://doi.org/10.1594/PANGAEA.973164 Wu, Xinying

12332224@mail.sustech.edu.cn

https://orcid.org/0009-0009-2826-3156 information author Hu, Yue

huy6@sustech.edu.cn

author Nan, Jingbo

Jnan@nigpas.ac.cn

author Yao, Weiqi

yaowq@sustech.edu.cn

author PANGAEA

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https://www.pangaea.de/ information publisher tableDigital The multi-proxies (BAR, bio-SiO2 MAR, and CaCO3 MAR) of productivity in Ocean Drilling Program (ODP) Leg 121 Site 758 Hole A (5°23.05'N, 90°21.67'E) during the late Miocene. Based on the biostratigraphic zones, we convert sediment depths to absolute ages on the Geologic Time Scale 2020 timescale (Gradstein et al., 2020; doi:10.1016/C2020-1-02369-3). We extract barite from marine sediments using the modified sequential leaching method (Eagle et al., 2003; doi:10.1029/2002PA000793; Paytan et al., 1993, doi:10.1038/366445a0) and examine the size and morphology of barite crystals by a scanning electron microscopy coupled with energy dispersive X-ray spectroscopy (SEM-EDX). We use the modified method after Mortlock et al. (1989, doi:10.1016/0198-0149(89)90092-7) and Lyle et al. (2019, doi:10.5194/cp-15-1715-2019) to extract biogenic opal from marine sediments. For the carbonate extraction, we digest sediments with 1.5 ml hydrofluoric acid and 0.5 ml concentrated nitric acid in a 50-ml Teflon tube at 180°C for 12 hours. After digestion, we evaporate all the acids on a 150°C electric heating plate. The sample reacts with 1 ml concentrated nitric acid and 1 ml Milli-Q water at 150°C for 12 hours. The supernatants are diluted to 40 g and are further prepared for Inductively Coupled Plasma Optical Emission Spectrometry analysis. We calculate mass accumulation rate (MAR) as a function of linear sedimentation rate (cm/ka) and dry bulk density (g/cm³). Sedimentation rates are obtained from the known reference points from the chronostratigraphic framework. The ODP reports obtain dry bulk density data (Peirce & Weissel, 1989; doi:10.2973/odp.proc.ir.121.115.1989). The accumulation rates of biogenic components (i.e., BAR, CaCO3 MAR, and bio-SiO2 MAR) are calculated as the product of MAR and the weight percent of biogenic components (wt%) in sediments. In the meantime, we analyze Baexcess to estimate export productivity (Pnew) following the algorithm equation after Dymond et al., 1992; doi:10.1029/92PA00181. completed Wu, Xinying

12332224@mail.sustech.edu.cn

https://orcid.org/0009-0009-2826-3156 information principalInvestigator Biogenic bloom Late Miocene Marine barite productivity proxies Upwelling theme 1995-01-01 creation PANGAEA

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https://www.pangaea.de/ information pointOfContact copyright copyright CC-BY-4.0: Creative Commons Attribution 4.0 International textTable und geoscientificInformation 90.3612 90.3612 5.3842 5.3842 1988-06-15T23:50:00 1988-06-24T13:30:00 63.38 124.04 Sample code/label thematicClassification DSDP/ODP/IODP sample designation DEPTH, sediment/rock physicalMeasurement Meters below sea floor [mbsf] m m Age physicalMeasurement Age model, Gradstein et al. (2020) GTS2020 Ma Ma Accumulation rate, mass physicalMeasurement Calculated g/cm**2/ka g/cm**2/ka Barite physicalMeasurement Sequential leaching method according to Eagle et al. (2003) and Paytan et al. (1993); [wt%] % % Accumulation rate, barite physicalMeasurement Calculated mg/cm**2/ka mg/cm**2/ka Opal, biogenic silica physicalMeasurement Opal extraction according to Mortlock et al. (1989) and Lyle et al. (2019); [wt%] % % Accumulation rate, biogenic silica physicalMeasurement Calculated g/cm**2/ka g/cm**2/ka Calcium carbonate physicalMeasurement Inductively Coupled Plasma - Optical Emission Spectrometry (ICP-OES); [wt%] % % Accumulation rate, calcium carbonate mass physicalMeasurement Calculated g/cm**2/ka g/cm**2/ka Barium physicalMeasurement Inductively Coupled Plasma Mass Spectrometer (ICP-MS), Varian, Varian 820 ES mg/kg mg/kg Aluminium physicalMeasurement Inductively Coupled Plasma - Optical Emission Spectrometry (ICP-OES) mg/kg mg/kg Barium excess physicalMeasurement Inductively Coupled Plasma - Optical Emission Spectrometry (ICP-OES) mg/kg mg/kg Productivity of carbon physicalMeasurement According to Dymond et al. (1992) g/m**2/a g/m**2/a text/tab-separated-values unknown https://doi.pangaea.de/10.1594/PANGAEA.973164?format=textfile download dataset The data set was checked for completeness, correctness, and consistency of metainformation. Validity of used methods was checked and - if applicable - precision and range of data. EVENT LABEL: 121-758A * LATITUDE: 5.384200 * LONGITUDE: 90.361200 * DATE/TIME START: 1988-06-15T23:50:00 * DATE/TIME END: 1988-06-24T13:30:00 * ELEVATION: -2935.0 m * Penetration: 676.8 m * Recovery: 453.83 m * LOCATION: Indian Ocean * CAMPAIGN: Leg121 * BASIS: Joides Resolution * METHOD/DEVICE: Drilling/drill rig 73 cores; 676.8 m cored; 0 m drilled; 67.1 % recovery 1988-06-15T23:50:00