摘要
颗石藻元素地球化学研究在古海洋学研究中有着重要意义。目前开始研究的主要有Sr/Ca和Mg/Ca比值。研究发现,颗石的Sr/Ca比值主要受颗石藻生长和钙化速度控制,其次受温度影响;而Mg/Ca比值主要与温度有关,属种间受影响程度有差别。样品清洗和单种分离是颗石藻元素地球化学分析的重点和难点。倒置显微镜挑出单种颗石是目前最为方便且准确的分析方法。颗石Sr/Ca比值可以用来反映古生产力,Mg/Ca比值可以用来重建古温度。
Element geochemistry of coccoliths is very meaningful in paleoceanographic study,e.g.,Sr/Ca and Mg/Ca ratios.This paper summarizes previous studiesof coccolith Sr/Ca and Mg/Ca.According to previous studies,coccolith Sr/Ca ratio is mainly controlled by growth rates and calcification rates,secondly by temperature.While coccolith Mg/Ca ratio is influenced by temperature,but temperature relation differs among species.It is criticalto clean samples and separate monospecific coccoliths.Ion probe method is the most convenient and accurate analytical method.Coccolith Sr/Ca ratio can be used to indicatepaleoproductivity,and Mg/Ca to reconstruct paleotemperature.Element geochemistry has a great potential in paleoceanography and paleoclimatology.This paper also introduces the principle and analytical method of coccolith Sr/Ca and Mg/Ca in detail.
出处
《地球科学进展》
CAS
CSCD
北大核心
2012年第2期217-223,共7页
Advances in Earth Science
基金
国家自然科学基金项目"南海现代颗石藻及其环境响应"(编号:40876023)资助
