海洋科学Issue(9)：86-93,8.DOI:10.11759/hykx20140314001
近2 Ma帕里西-维拉海盆沉积物中碎屑组分粒度特征及其物源和古气候意义
Grain-size distribution of detrital sediment in the Parece Vela Basin and its implication of provenance and palaeoclimate over the last 2 Ma
摘要
Abstract
Grain-size analysis on the detrital fraction of deep-sea sediments from the Parece Vela Basin shows that the grain size ranges from 0.5 to 32μm (mean grain size=3.2μm), and the grain size distribution appears to be bi-modal characteristics and negative skewness. Weibull distribution function is used to fit the grain-size distributions of each sample, and two different end-member components are separated from each sample. The fine-grained frac-tion shows a distinct size mode at about 2μm in the range of narrow distribution (mainly 0.5~16μm), which coin-cident with the eolian dust of the North Pacific. We argue that this fraction is mainly derived from Asian dust and is the major component (60%~90%) of the detrital sediment. The coarse fraction is characterized by a wider size range (about 1.6~32μm), a flatter size distribution, and a size mode at about 10μm. The coarse fractions are mainly de-rived from the ridges and islands in and around the Parece Vela Basin. The different size fraction of core PV090102 responses well to the enhanced aridity in the Asian continent and the intensified atmospheric circulation over the last 2 Ma, as well as the strengthened volcanic activity of the Western Pacific since the last 0.5 Ma. This study shows that the grain size composition of the detrital sediment in the Western Pacific is helpful to reconstruct the history of Asian aridity and atmospheric circulation since Quaternary.关键词
帕里西-维拉海盆/粒度特征/亚洲风尘Key words
theParece Vela Basin/grain size characteristics/Asian dust分类
天文与地球科学引用本文复制引用
周宇,蒋富清,徐兆凯,方海超,张晋,李安春..近2 Ma帕里西-维拉海盆沉积物中碎屑组分粒度特征及其物源和古气候意义[J].海洋科学,2015,(9):86-93,8.基金项目
国家自然科学基金项目(40976026,41376064) （40976026,41376064）
全球变化与海气相互作用专项(GASI-04-01-02) （GASI-04-01-02）
中国科学院战略性先导科技专项(A)类(XDA11030302) （A）
