Hydrogen isotope composition of mantle-derived mica megacryst from ion micro probe analysis  

作　　者：夏群科 陈道公 支霞臣 

出　　处：《Science China Earth Sciences》1999年第4期392-398,共7页中国科学（地球科学英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant Nos. 803002 and 49773181).

摘　　要：The hydrogen isotope composition of a mantle-derived mica megacryst from Cenozoic basanite from NUshan, Anhui Province has been determined by ion micro probe. The results demonstrate that δD and water content of the megacryst were heterogeneous on the micro scale, which resulted from reaction with meteoric water after being brought to the surface. The primary δD of mica megacrysts was about-23‰, suggesting the recycled crustal materials in its source. By combining these values with those of other researchers, it is believed that the hydrogen isotope composition of the mantle is heterogeneous at least on the large scale.The hydrogen isotope composition of a mantle-derived mica megacryst from Cenozoic basanite from Nushan, Anhui Province has been determined by ion micro probe. The results demonstrate that δD and water content of the megacryst were heterogeneous on the micro scale, which resulted from reaction with meteoric water after being brought to the surface. The primary δD of mica megacrysts was about - 23‰, suggesting the recycled crustal materials in its source. By combining these values with those of other researchers, it is believed that the hydrogen isotope composition of the mantle is heterogeneous at least on the large scale.

关 键 词：MICA MEGACRYST hydrogen isotope ION MICRO probe. 

分 类 号：P575[天文地球—矿物学]