海南师范大学学报：自然科学版2012，Vol.25Issue(2)：221-226,236,7.
福州盆地马堡红土地球化学元素特征及其气候环境意义
Characteristic of Geochemistry Element of Laterite at Mabao in Fuzhou and Its Climatic Evironment Significance
摘要
Abstract
This paper researches the ratio of the elements and its characteristics of the changes at Maobao profile in Fuzhou on the basis of ESR dating. The results show that： The primary oxides of major elements are mainly SiO2, Al2O3 and Fe2O3, whereas the MgO, Na20, CaO and K20 contents are low. SiO2/Al2O3 ratio ranges from 1.81 to 2.42 （average of 2.00）, SiO2/（AhO3＋Fe2O3） ratio ranges from 1.30 to 1.87 （average of 1.49）, CIA values range from 88.63 to 95.98 （average of 93.71）, Ba values range from 0.07 to 0.16 （average of 0.10）, Therefore, the red earth underwent wet-hot weathering and desilicification-allitization process. Meanwhile, there is a high enrichment degree of the trace elements, the upper continental crust-normalized value for trace elements displays enrichment of V, Cu, Zn, Rb and Co and eluviation of Sr, Ba, Ni and Zr. The red earth of Mabao profile forms in the middle of late Pleistocene. For the relationship between trace elements and climate change, the elements with more stable chemical properties, such as Cu, Zn, Co, Sr etc, their high value in general corresponds to the strength of chemical weathering, as well as the development degree of the red earth, moreover, it means a warm and wet climate, on the contrary, the low value corresponds to the weaken chemical weathering, it means a cold and dry climate. Along with the increase of the weathering intensity, Rb/Sr ratio increased. The spin- ning back change indicated by the contain and the ratio of the elements shows that the major change of regional climate is converting from the weather which is warm and dry to the weather which is warm and wet, with the small scale of the spinning back change since the Middle-late of late pleistocene. The fluctuation of the climate change is obvious totally. The climate changes recorded by the content and their ratio of the geochemical element at Mabao profile is the specific response to the global climatic changes, and meanwhile it displays special zonality at the subtropical monsoon region.关键词
福州马堡/晚更新世/地球化学元素/变化规律/气候变化Key words
Mabao in Fuzhou/late Pleistocene/geochemical element/rule of change/climate change分类
地质学引用本文复制引用
祝淑雅,陈斐然,叶桂萍,胡凡根,张辉,赵倩,靳建辉..福州盆地马堡红土地球化学元素特征及其气候环境意义[J].海南师范大学学报：自然科学版,2012,25(2):221-226,236,7.基金项目
福建省自然科学基金项目 （）
福建省大学生创新性实验计划项目 （）
福建师范大学本科生课外科技项目 （）
