Comparison of sediment composition by smear slides to quantitative shipboard data: a case study on the utility of smear slide percent estimates, IODP Expedition 353, northern Indian Ocean
dc.contributor.author | Phillips, SC | |
dc.contributor.author | Littler, K | |
dc.date.accessioned | 2022-03-02T14:20:32Z | |
dc.date.issued | 2022-02-25 | |
dc.date.updated | 2022-03-02T14:01:23Z | |
dc.description.abstract | Abstract. Smear slide petrography has been a standard technique during scientific ocean drilling expeditions to characterize sediment composition and classify sediment types, but presentation of these percent estimates to track downcore trends in sediment composition has become less frequent over the past 2 decades. We compare semi-quantitative smear slide composition estimates to physical property (natural gamma radiation, NGR) and solid-phase geochemical (calcium carbonate, CaCO3 %) measurements from a range of marine depositional environments in the northern Indian Ocean (Bay of Bengal, Andaman Sea, Ninetyeast Ridge) collected during International Ocean Discovery Program (IODP) Expedition 353. We show that presenting smear slide estimates as percentages, rather than abundance categories, reveals similar downcore variation in composition to the more quantitative core analyses. Overall downcore trends in total calcareous components from smear slides (foraminifers + nannofossils + shell fragments + authigenic carbonate) follow similar downcore trends to samples measured by CaCO3 coulometry. Total lithogenic components (clay + mica + quartz + feldspars + lithic grains + vitric grains + glauconite + heavy minerals + iron oxides) and clay from smear slides track reasonably well with NGR measurements. Comparison of site averages of absolute percentages of total calcium carbonate from coulometry and total calcareous components from smear slide observations reveals an overestimation in carbonate percentages in smear slides (likely due in part to underestimation of the clay fraction), especially in sediments rich in smectite clays. Differences in sediment color between sites and settling of clay particles during slide preparation may contribute to this discrepancy. Although smear slide estimates range in accuracy depending on the training of the operator, we suggest that sedimentologists describing cores obtained during scientific drilling can use the percent estimates of sedimentary components in smear slides to identify trends and cyclicity in marine sediment records. | en_GB |
dc.identifier.citation | Vol. 30, pp. 59-74 | en_GB |
dc.identifier.uri | http://hdl.handle.net/10871/128921 | |
dc.identifier | ORCID: 0000-0002-4604-3634 (Littler, Kate) | |
dc.identifier | ScopusID: 36126559200 (Littler, Kate) | |
dc.language.iso | en | en_GB |
dc.publisher | Copernicus Publications / German Research Centre for Geosciences / International Continental Scientific Drilling Program / International Ocean Discovery Program | en_GB |
dc.relation.url | https://web.iodp.tamu.edu/LORE/ | en_GB |
dc.relation.url | https://doi.org/10.1594/IEDA/100668 | en_GB |
dc.relation.url | http://www.kochi-core.jp/en/ iodp-curation/index.html | en_GB |
dc.rights | © Author(s) 2021. Open access. This work is distributed under the Creative Commons Attribution 4.0 License | en_GB |
dc.title | Comparison of sediment composition by smear slides to quantitative shipboard data: a case study on the utility of smear slide percent estimates, IODP Expedition 353, northern Indian Ocean | en_GB |
dc.type | Article | en_GB |
dc.date.available | 2022-03-02T14:20:32Z | |
dc.description | This is the final version. Available on open access from Copernicus Publications via the DOI in this record. | en_GB |
dc.description | Data availability. All primary data in this paper (smear slide estimates, coulometer CaCO3, NGR, and photomicrographs) generated during shipboard operations of IODP Expedition 353 are available online as part of the IODP LIMS Online Report Portal: https://web.iodp.tamu.edu/LORE/ (International Ocean Discovery Program JOIDES Resolution Science Operator, 2021). K, U, and Th contents quantified from NGR spectra are available in the EarthChem data library (https://doi.org/10.1594/IEDA/100668, DeVleeschouwer, 2017) | en_GB |
dc.description | Sample availability. All IODP Expedition 353 cores, including sites U1443, U1446, and U1448, are archived at the IODP repository at the Kochi Core Center (http://www.kochi-core.jp/en/ iodp-curation/index.html, last access: 6 December 2021). | en_GB |
dc.identifier.eissn | 1816-3459 | |
dc.identifier.journal | Scientific Drilling | en_GB |
dc.rights.uri | https://creativecommons.org/licenses/by/4.0/ | en_GB |
dcterms.dateAccepted | 2021-11-07 | |
rioxxterms.version | VoR | en_GB |
rioxxterms.licenseref.startdate | 2022-02-25 | |
rioxxterms.type | Journal Article/Review | en_GB |
refterms.dateFCD | 2022-03-02T14:15:22Z | |
refterms.versionFCD | VoR | |
refterms.dateFOA | 2022-03-02T14:20:38Z | |
refterms.panel | B | en_GB |
refterms.dateFirstOnline | 2022-02-25 |
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Except where otherwise noted, this item's licence is described as © Author(s) 2021. Open access. This work is distributed under the Creative Commons Attribution 4.0 License