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30ka以来南海东北部陆坡坡底沉积有机质的长链正构烷烃特征及其古植被意义
THE n-ALKANE RECORDS FROM SEDIMENTS IN THE BASE OF SLOPE (NEAR ABYSSAL PLAIN) OF THE NORTH-EASTERN SOUTH CHINA SEA (SCS) OVER THE LAST 30ka: IMPLICATIONS FOR PALEOVEGETATION

查看参考文献35篇

杨楚鹏 1   刘芳 2   常晓红 3   廖泽文 2   胡建芳 2   李顺 3   李学杰 3   姚永坚 3  
文摘 为探寻南海深海平原区的有机质组成特征、来源及其所反映的古气候/环境演化信息,对南海东北部深水区的ZSQD289沉积柱状样品进行了正构烷烃组成及其单体稳定碳同位素的相关分析,结合孢粉鉴定结果,重点探讨该沉积区末次冰期以来陆源输入变化、源区的古植被演化及其气候响应因素。结果表明:30ka以来,南海东北部深海陆坡坡底的沉积有机质以洋/陆混源为特征,且以海洋自生生产力贡献为主,其生源贡献存在明显的冰期/间冰期旋回变化特征,冰期时陆源有机质输入明显高于全新世间冰期;其陆源有机质应该主要由台湾南部河流输入,在低海平面时通过海底峡谷搬运至此,其过程中可能受到西太平洋底流和黑潮的影响。该沉积源区植被演化经历了 C_3/C_4植物互为消长的变化过程,但30ka以来主要还是以C_3植物占优势,由此推测末次冰期以来源区(台湾岛南部)不存在明显的干旱化,冰期虽然温度较低但气候比较湿润。
其他语种文摘 To investigate organic sources and paleo-environmental response on geological time scales in the Abyssal Plain of the South China Sea (SCS) , we selected the sediment core ZSDQ289 (20°52'N, 119°52.3'E) with length 847cm, collected from the base of slop in the northeastern SCS in 2011. The core has relatively uniform lithology and steady deposition which is composed of gray and dark gray siliceous and calcareous clay with thin sandsilt interbed. Its data frame was established by linear interpolation method according to the oxygen isotope curve of Globigerinoides ruber shells and the AMS ~(14)C data of G. ruber shells and organic matters. The top age of the core is about lka and its bottom age is about 30ka. The content of n-alkanes and their compound-specific stable carbon isotopes were analyzed at a relatively low resolution to trace the glacial-interglacial variations,with 46 samples covering a total of 30ka,which has been investigated concerning their organic matter composition,terrigenous sources contribution and paleo-climatic/environmental change since 30ka. Alkane proxies of L_(22)_/H_(23+) and C_(31)/C_(17) ratios indicated that the sediment organics were contributed from mixed marine and terrestrial sources and dominated by the marine contribution over the past 30ka. The L_(22)_/H_(23+) ratios decreased while C_(31)/C_(17) increased obviously during glacial period. The average total content of long-chain n-alkane ( nC_(25) ~nC_(33) ),representing terrestrial high plants contribution, were higher by around 0.17μg/g in glacial period than those in interglacial period. In addition, the past C_3/C_4 plants composition of terrestrial contribution was reconstructed using compound-specific stable carbon isotopes of long-chain n-alkanes combined with some other appraisal proxies (eg. C_(31)/C_(27),ACL, and pollen data). The calculated results from a binary end-member model showed that the C_4% contribution ranges from 29.78% to 52.58%,and the average C_4% in glacial and interglacial period is 42.59% ±3.73% and 36.66% ±4.22%,respectively. Obviously the vegetation composition of the provenance (the southern Taiwan Island) of core ZSQD289 was dominated by C_3 plants throughout the past 30ka,which indicated that the provenance was not dry even during the last glacial period as the temperature was low.
来源 第四纪研究 ,2015,35(4):881-889 【核心库】
DOI 10.11928/j.issn.1001-7410.2015.04.10
关键词 南海 ; 正构烷烃参数 ; 单体碳同位素 ; 源区植被
地址

1. 广州海洋地质调查局, 国土资源部海底矿产资源重点实验室;;有机地球化学国家重点实验室, 广州, 510760  

2. 中国科学院广州地球化学研究所, 有机地球化学国家重点实验室, 广州, 510640  

3. 广州海洋地质调查局, 国土资源部海底矿产资源重点实验室, 广州, 510760

语种 中文
文献类型 研究性论文
ISSN 1001-7410
学科 地质学;海洋学
基金 国家自然科学基金青年科学基金 ;  国土资源部科技专项
文献收藏号 CSCD:5467630

参考文献 共 35 共2页

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引证文献 9 篇

1 叶翔 海南岛东南部陆架晚全新世以来海洋沉积物来源与环境变化特征 第四纪研究,2016,36(1):18-30
CSCD被引 5 次

2 刘志杰 海洋沉积物~(14)C测年数据整合与校正问题探讨 第四纪研究,2016,36(2):492-502
CSCD被引 5 次

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