摘要
采用电感耦合等离子质谱(ICP-MS)法,对南海南部86GC柱状沉积物样品的稀土元素(REE)含量进行测量,并对其地球化学特征进行系统分析。结果表明,自大约31kaBP以来,该海域的沉积物具有基本相同的物质来源,物源区的气候环境变化可能是影响沉积物中REE指标纵向变化的主要因素。各指标的综合分析显示,末次冰期南海南部海域的沉积物源区具有较强的化学风化作用,冰后期则相对减弱,这就意味着南海南部及周边地区末次冰期期间依然盛行热带气候,冰后期的气候环境则可能较为多变。另外,在柱状样深度分别为17cm和100cm处均记录了指标的突变,前者可能是8k事件在南海南部的记录,后者代表的事件还有待进一步研究。
Rare earth elements （REEs） in 86GC core sediments from the southem South China Sea （SCS） were measured on an inductively coupled plasma mass spectrometry （ICP-MS）. Results from this systematic investigation of the REES chemical characteristics show that the sediments around our studied area had the same main provenience during the Last 31 ka, and the climatic environment variations should be the main factor causing the vertical variations of REE indexes. Synthetically analysis potentially denote stronger chemical weathering intensity during the last glacial period than that during the post-glacial on the source areas of the southern SCS, which implys that the tropical climate had probably still prevailed in the adjacent land and islands of the southern SCS even during the last glacial, while, the climate during the post-glacial seems to be changeful. Furthermore, abrupt changes in the proxies at the depth of 17cm and 100cm occurred, respectively. The former may be the imprints of 8k event in the southern South China Sea, and the later need further study.
出处
《热带地理》
北大核心
2010年第1期24-29,共6页
Tropical Geography
基金
中科院边缘海地质重点实验室开放基金(MSGL08-07)
国家自然科学基金(40901013
40272077)
广东省科学院青年基金(qnjj200912)
关键词
南海南部
稀土元素
古环境
晚第四纪
Southern South China Sea： earth element： paleoenvironment： Late Quaternary
