IOCAS-IR  > 海洋地质与环境重点实验室
Millennial-scale evolution of elemental ratios in bulk sediments from the western Philippine Sea and implications for chemical weathering in Luzon since the Last Glacial Maximum
Xiong, Zhifang1,2; Li, Tiegang1,2; Jiang, Fuqing2,3; Chang, Fengming2,3; Chen, Shuangxi4
2019-08-01
Source PublicationJOURNAL OF ASIAN EARTH SCIENCES
ISSN1367-9120
Volume179Pages:127-137
Corresponding AuthorLi, Tiegang(tgli@fio.org.cn)
AbstracttTo reconstruct the chemical weathering history in Luzon, Philippines, since the Last Glacial Maximum (LGM), major and trace elements (Ti, Al, Fe, K, Ba, Rb, V, Sc, Cr, and Th) and grain size were determined for core MD06-3054 as well as the bulk and detrital fractions of three core-top samples from the western Philippine Sea (WPS). In combination with previously published Sr-Nd isotopes, our new results indicate that Ti-normalized elemental ratios in the study samples were not controlled by the quantity of biogenic, authigenic, or diagenetic materials, sediment provenance, or grain size. Instead, variations in Ti-normalized elemental ratios mainly reflect changes in chemical weathering intensity, with lower values representing stronger chemical weathering in Luzon. To assess long-term integrated chemical weathering patterns, we defined a stacked chemical weathering index (SCWI) based on all elemental ratios in the study core. Downcore SCWI records indicate that sediments deposited during the LGM underwent a degree of chemical weathering equal to that during the Holocene, and sediments deposited during the last deglaciation exhibit rapid changes in chemical weathering, with higher intensity during the Heinrich event 1 (H1) and Younger Dryas (YD), and lower intensity during the Bolling-Allerod (B/A) in the WPS. These observations are in excellent agreement with chemical weathering proxies, such as the K/Al ratios and chemical index of alteration when applied to the same core. We infer that persistent sea-level lowstand and induced reworking of poorly consolidated sediments on the eastern Luzon continental shelf during the LGM accounted for equal or slightly stronger chemical weathering for the LGM sediments relative to the Holocene sediments. Rainfall, rather than air temperature, in Luzon was responsible for the rapid changes in chemical weathering during the last deglaciation, with higher precipitation generating stronger chemical weathering during the H1 and YD than during the B/A. Our observations, combined with existing data, suggest that strong weathering of marine sediments during colder intervals of the middle late Quaternary is likely to be a general feature of the tropical West Pacific, although the mechanism that underlies this phenomenon remains controversial.
KeywordDetrital fraction Sea level Air temperature and rainfall Sediment remobilization Rapid change
DOI10.1016/j.jseaes.2019.04.021
Indexed BySCI
Language英语
Funding ProjectOpen Fund of Qingdao National Laboratory for Marine Science and Technology[QNLM2016ORP0205] ; Basic Scientific Fund for National Public Research Institutes of China[2017Y07] ; Basic Scientific Fund for National Public Research Institutes of China[2019S04] ; National Natural Science Foundation of China[41106042] ; National Natural Science Foundation of China[41830539] ; National Natural Science Foundation of China[41776065] ; National Natural Science Foundation of China[41576051] ; Scientific and Technological Innovation Project of Qingdao National Laboratory for Marine Science and Technology[2016ASKJ13] ; China Scholarship Council[[2017] 3059]
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000472686600010
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/161793
Collection海洋地质与环境重点实验室
Corresponding AuthorLi, Tiegang
Affiliation1.Minist Nat Resources, Inst Oceanog 1, Key Lab Marine Sedimentol & Environm Geol, Qingdao 266061, Shandong, Peoples R China
2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266237, Shandong, Peoples R China
3.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Shandong, Peoples R China
4.China Geol Survey, Wuhan Ctr, Wuhan 430205, Hubei, Peoples R China
Recommended Citation
GB/T 7714
Xiong, Zhifang,Li, Tiegang,Jiang, Fuqing,et al. Millennial-scale evolution of elemental ratios in bulk sediments from the western Philippine Sea and implications for chemical weathering in Luzon since the Last Glacial Maximum[J]. JOURNAL OF ASIAN EARTH SCIENCES,2019,179:127-137.
APA Xiong, Zhifang,Li, Tiegang,Jiang, Fuqing,Chang, Fengming,&Chen, Shuangxi.(2019).Millennial-scale evolution of elemental ratios in bulk sediments from the western Philippine Sea and implications for chemical weathering in Luzon since the Last Glacial Maximum.JOURNAL OF ASIAN EARTH SCIENCES,179,127-137.
MLA Xiong, Zhifang,et al."Millennial-scale evolution of elemental ratios in bulk sediments from the western Philippine Sea and implications for chemical weathering in Luzon since the Last Glacial Maximum".JOURNAL OF ASIAN EARTH SCIENCES 179(2019):127-137.
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