中国东南部新生代岩石圈地幔研究

利用中国东南部新生代玄武岩中约２００个深源捕虏体，试图认识该区岩石圈地幔的成分特征，了解其经历的地幔作用过程，通过电子探针（ＥＭＰ）和激光探针（ＬＡＭ－ＩＣＰＭＳ）微束技术，对具代表性的深源捕虏体中的矿物进行了主量元素和微量元素地球化学分析，结合全岩主量元素地球化学特征，提出中国东南部元古代地壳之下主要为新的饱满型地幔，而这种新生代岩石圈地幔的形成与该区晚中生代以来软流圈上涌、岩石圈减薄和伸展作用密切相关。

STUDIES OF THE CENOZOIC LITHOSPHERIC MANTLE BENEATH SOUTHEAST CHINA

Mantle derived xenoliths can provide direct information on mantle processes. This study uses a large number of xenoliths from Cenozoic basaltic rocks in Southeast China, to understand the composition of the subcontinental mantle over a wide area, and to evaluate the processes of the lithospheric mantle. In situ analysis of trace elements in minerals by laser ablation ICPMS microprobe (LAM ICPMS), and major element analysis by electron microprobe have been used to explore the trace element geochemistry of minerals in the xenoliths and to fingerprint the processes of the lithospheric mantle. It is recognised that the genesis of Cenozoic lithospheric mantle beneath SE China is closely related to the upwelling of the asthenospheric mantle, the thinning and extension of the lithospheric mantle.