末次冰期以来巽他陆架东北部陆坡区正构烷烃分布特征及其古植被意义

崔子恒; 贺娟; 贾国东

doi:10.3799/dqkx.2019.246

Volume 46 Issue 1

Jan. 2021

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Article Navigation > Earth Science > 2021 > 46(1): 331-340

Cui Ziheng, He Juan, Jia Guodong, 2021. Composition Distribution of n-Alkanes in Slope Sediments of the Northeast Sunda Shelf since the Last Glacial Period and Its Palaeo-Vegetation Significance. Earth Science, 46(1): 331-340. doi: 10.3799/dqkx.2019.246

Citation:

Cui Ziheng, He Juan, Jia Guodong, 2021. Composition Distribution of n-Alkanes in Slope Sediments of the Northeast Sunda Shelf since the Last Glacial Period and Its Palaeo-Vegetation Significance. Earth Science, 46(1): 331-340. doi: 10.3799/dqkx.2019.246

Citation:

Cui Ziheng, He Juan, Jia Guodong, 2021. Composition Distribution of n-Alkanes in Slope Sediments of the Northeast Sunda Shelf since the Last Glacial Period and Its Palaeo-Vegetation Significance. Earth Science, 46(1): 331-340. doi: 10.3799/dqkx.2019.246

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Composition Distribution of n-Alkanes in Slope Sediments of the Northeast Sunda Shelf since the Last Glacial Period and Its Palaeo-Vegetation Significance

doi: 10.3799/dqkx.2019.246

State Key Laboratory of Marine Geology Tongji University, Shanghai 200092, China

Received Date: 2019-09-29
Publish Date: 2021-01-15

Abstract

Abstract

To better understand vegetation change in the northeastern Sunda shelf since the last glacial period and its significance for carbon cycle,we analyzed long-chain n-alkanes in a sediment core (18252-3) on the southwest slope of the South China Sea covering the last 40 000 years. Our data show that carbon preference index (CPI_27-33) was correlated well with sea level changes since the last glacial period. During the glacial time,greater odd-to-even predominance and higher concentration of long-chain n-alkanes (C₂₇-C₃₃) than thereafter reflect higher freshness of these leaf wax n-alkanes,indicating a main vegetation source from the nearby exposed shelf. This could be also the cause for the higher contents of total leaf wax n-alkanes (∑oddC₂₇-C₃₃) during the glacial low sea-level time. The average chain length (ACL_27-33) increased since 40 ka B.P.,reflecting more herbaceous contribution and/or slight drying of climate. Our data also show that the relative content of n-C₂₉ and n-C₃₁ alkanes was not significantly different and much higher than that of n-C₃₃ on the exposed Sunda shelf during the glacial period. However,the relative content decreased for n-C₂₉ significantly,but increased for n-C₃₃ in Holocene. Along with previous studies in the southeastern Sunda shelf,the data indicate that the exposed shelf was dominated by tropical rainforest during the glacial period. Because the tropical rainforests may reserve substantial organic carbon,the Sunda shelf was likely to be a huge carbon sink during the glacial period.
- Sunda Shelf,
- n-alkane,
- vegetation type,
- last glacial time,
- geochemistry

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References(40)

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