Deciphering Color Reflectance Data of a 520-kyr Sediment Core From the Southern Ocean: Method Application and Paleoenvironmental Implications
Sediment color reflectance contains important information on paleoenvironmental changes. Such data are routinely measured on sediment cores from the Southern Ocean. Their usefulness, however, is undervalued. Here for the first time, color reflectance of an ~520-kyr sediment core retrieved off Prydz...
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ftunivutrecht:oai:dspace.library.uu.nl:1874/384411 2023-11-12T04:07:13+01:00 Deciphering Color Reflectance Data of a 520-kyr Sediment Core From the Southern Ocean: Method Application and Paleoenvironmental Implications Wu, Li Wang, Rujian Krijgsman, Wout Chen, Zhihua Xiao, Wenshen Ge, Shulan Wu, Jiawang Paleomagnetism Geochemistry 2019-06 image/pdf https://dspace.library.uu.nl/handle/1874/384411 en eng 1525-2027 https://dspace.library.uu.nl/handle/1874/384411 info:eu-repo/semantics/OpenAccess color reflectance factor analysis Fe minerals marine sediment Mn peaks Southern Ocean Geophysics Geochemistry and Petrology Article 2019 ftunivutrecht 2023-11-01T23:21:07Z Sediment color reflectance contains important information on paleoenvironmental changes. Such data are routinely measured on sediment cores from the Southern Ocean. Their usefulness, however, is undervalued. Here for the first time, color reflectance of an ~520-kyr sediment core retrieved off Prydz Bay (East Antarctica) was intensively investigated to correlate sediment color changes to changes in sediment compositions. Total carbon, total organic carbon, X-ray fluorescence-derived Fe/Ti and Br/Ti ratios, water content and mineral composition of sediment from this core, and color reflectance of another two sediment cores retrieved nearby were analyzed in this study. The raw reflectance data were transformed into their first-order derivatives and subjected to factor analysis algorithms. A four-factor model was selected to unmix the data set, explaining >80% of the total data variance. Its robustness is supported by similar factor analysis results from the other two cores. The four factors represent (from Factors 1–4) pulses of sedimentary Mn enrichment and Fe3+/Fe2+ changes in clay minerals, relative content changes of colorless components, hematite and goethite, and water, respectively. Scores of Factor 1 show high spikes at glacial terminations, recording enhanced deglacial ventilation in the abyssal Southern Ocean. Scores of Factor 2 mainly reflect biogenic components and chlorite but are further complicated by refractory terrigenous organic carbon and Mn-oxides/-hydroxides. Higher Scores of Factor 3 occur mainly at peak interglacial intervals, associated with enhanced transport of sediment of Antarctic origin by oceanic currents. Water content (Factor 4) in the core sediment was significantly influenced by opal content and sediment grain size compositions. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Prydz Bay Southern Ocean Utrecht University Repository Antarctic East Antarctica Prydz Bay Southern Ocean |
institution |
Open Polar |
collection |
Utrecht University Repository |
op_collection_id |
ftunivutrecht |
language |
English |
topic |
color reflectance factor analysis Fe minerals marine sediment Mn peaks Southern Ocean Geophysics Geochemistry and Petrology |
spellingShingle |
color reflectance factor analysis Fe minerals marine sediment Mn peaks Southern Ocean Geophysics Geochemistry and Petrology Wu, Li Wang, Rujian Krijgsman, Wout Chen, Zhihua Xiao, Wenshen Ge, Shulan Wu, Jiawang Deciphering Color Reflectance Data of a 520-kyr Sediment Core From the Southern Ocean: Method Application and Paleoenvironmental Implications |
topic_facet |
color reflectance factor analysis Fe minerals marine sediment Mn peaks Southern Ocean Geophysics Geochemistry and Petrology |
description |
Sediment color reflectance contains important information on paleoenvironmental changes. Such data are routinely measured on sediment cores from the Southern Ocean. Their usefulness, however, is undervalued. Here for the first time, color reflectance of an ~520-kyr sediment core retrieved off Prydz Bay (East Antarctica) was intensively investigated to correlate sediment color changes to changes in sediment compositions. Total carbon, total organic carbon, X-ray fluorescence-derived Fe/Ti and Br/Ti ratios, water content and mineral composition of sediment from this core, and color reflectance of another two sediment cores retrieved nearby were analyzed in this study. The raw reflectance data were transformed into their first-order derivatives and subjected to factor analysis algorithms. A four-factor model was selected to unmix the data set, explaining >80% of the total data variance. Its robustness is supported by similar factor analysis results from the other two cores. The four factors represent (from Factors 1–4) pulses of sedimentary Mn enrichment and Fe3+/Fe2+ changes in clay minerals, relative content changes of colorless components, hematite and goethite, and water, respectively. Scores of Factor 1 show high spikes at glacial terminations, recording enhanced deglacial ventilation in the abyssal Southern Ocean. Scores of Factor 2 mainly reflect biogenic components and chlorite but are further complicated by refractory terrigenous organic carbon and Mn-oxides/-hydroxides. Higher Scores of Factor 3 occur mainly at peak interglacial intervals, associated with enhanced transport of sediment of Antarctic origin by oceanic currents. Water content (Factor 4) in the core sediment was significantly influenced by opal content and sediment grain size compositions. |
author2 |
Paleomagnetism Geochemistry |
format |
Article in Journal/Newspaper |
author |
Wu, Li Wang, Rujian Krijgsman, Wout Chen, Zhihua Xiao, Wenshen Ge, Shulan Wu, Jiawang |
author_facet |
Wu, Li Wang, Rujian Krijgsman, Wout Chen, Zhihua Xiao, Wenshen Ge, Shulan Wu, Jiawang |
author_sort |
Wu, Li |
title |
Deciphering Color Reflectance Data of a 520-kyr Sediment Core From the Southern Ocean: Method Application and Paleoenvironmental Implications |
title_short |
Deciphering Color Reflectance Data of a 520-kyr Sediment Core From the Southern Ocean: Method Application and Paleoenvironmental Implications |
title_full |
Deciphering Color Reflectance Data of a 520-kyr Sediment Core From the Southern Ocean: Method Application and Paleoenvironmental Implications |
title_fullStr |
Deciphering Color Reflectance Data of a 520-kyr Sediment Core From the Southern Ocean: Method Application and Paleoenvironmental Implications |
title_full_unstemmed |
Deciphering Color Reflectance Data of a 520-kyr Sediment Core From the Southern Ocean: Method Application and Paleoenvironmental Implications |
title_sort |
deciphering color reflectance data of a 520-kyr sediment core from the southern ocean: method application and paleoenvironmental implications |
publishDate |
2019 |
url |
https://dspace.library.uu.nl/handle/1874/384411 |
geographic |
Antarctic East Antarctica Prydz Bay Southern Ocean |
geographic_facet |
Antarctic East Antarctica Prydz Bay Southern Ocean |
genre |
Antarc* Antarctic Antarctica East Antarctica Prydz Bay Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Prydz Bay Southern Ocean |
op_relation |
1525-2027 https://dspace.library.uu.nl/handle/1874/384411 |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782327986790334464 |