Deciphering Color Reflectance Data of a 520-kyr Sediment Core From the Southern Ocean: Method Application and Paleoenvironmental Implications

doi:10.1029/2019GC008212

	Deciphering Color Reflectance Data of a 520-kyr Sediment Core From the Southern Ocean: Method Application and Paleoenvironmental Implications
	Wu, Li 1; Wang, Rujian 1; Krijgsman, Wout 2; Chen, Zhihua 3; Xiao, Wenshen 1; Ge, Shulan 3; Wu, Jiawang 1,2
刊名	GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
	2019-06
卷号	20 期号:6 页码:2808-2826
关键词	marine sediment color reflectance factor analysis Mn peaks Southern Ocean Fe minerals
ISSN号	1525-2027
DOI	10.1029/2019GC008212
英文摘要	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.
资助项目	China Postdoctoral Science Foundation[41806223] ; China Postdoctoral Science Foundation[2018 M632158] ; China Postdoctoral Science Foundation[41776191] ; China Postdoctoral Science Foundation[41676191]
WOS关键词	CLAY-MINERAL ASSEMBLAGES ; PRYDZ BAY-REGION ; CHINA SEA ; DETERMINING HEMATITE ; HOLOCENE SEDIMENTS ; CONTINENTAL-SLOPE ; MARINE-SEDIMENTS ; ATLANTIC-OCEAN ; ORGANIC-CARBON ; ODP SITE-1166
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000477582400015
内容类型	期刊论文
源URL	[http://ir.fio.com.cn:8080/handle/2SI8HI0U/24607]
专题	自然资源部第一海洋研究所
通讯作者	Wu, Li; Wang, Rujian
作者单位	1.Tongji Univ, State Key Lab Marine Geol, Shanghai, Peoples R China 2.Univ Utrecht, Dept Earth Sci, Utrecht, Netherlands 3.State Ocean Adm, Inst Oceanog 1, Qingdao, Shandong, Peoples R China
推荐引用方式 GB/T 7714	Wu, Li,Wang, Rujian,Krijgsman, Wout,et al. Deciphering Color Reflectance Data of a 520-kyr Sediment Core From the Southern Ocean: Method Application and Paleoenvironmental Implications[J]. GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,2019,20(6):2808-2826.
APA	Wu, Li.,Wang, Rujian.,Krijgsman, Wout.,Chen, Zhihua.,Xiao, Wenshen.,...&Wu, Jiawang.(2019).Deciphering Color Reflectance Data of a 520-kyr Sediment Core From the Southern Ocean: Method Application and Paleoenvironmental Implications.GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,20(6),2808-2826.
MLA	Wu, Li,et al."Deciphering Color Reflectance Data of a 520-kyr Sediment Core From the Southern Ocean: Method Application and Paleoenvironmental Implications".GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 20.6(2019):2808-2826.