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
刊名JOURNAL OF ASIAN EARTH SCIENCES
2019-08
卷号179页码:127-137
关键词Detrital fraction Sea level Air temperature and rainfall Sediment remobilization Rapid change
ISSN号1367-9120
DOI10.1016/j.jseaes.2019.04.021
英文摘要tTo 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.
资助项目China Scholarship Council[[2017] 3059]
WOS关键词SOUTH CHINA SEA ; ATMOSPHERIC CO2 ; MONSOON ; GEOCHEMISTRY ; RECORD ; INTENSITY ; BEHAVIOR ; EROSION ; RANGE ; DELTA
WOS研究方向Geology
语种英语
出版者PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号WOS:000472686600010
内容类型期刊论文
源URL[http://ir.fio.com.cn:8080/handle/2SI8HI0U/24598]  
专题自然资源部第一海洋研究所
通讯作者Li, Tiegang
作者单位1.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
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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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