宁强碳质球粒陨石基质及暗色边化学成份研究

采用仪器中子活化方法分析了宁强碳质球粒陨石基质及暗色边化学成份。结果表明,宁强陨石的基质比全岩富集轻稀土和亲硫元素,并大致具有与Allende陨石基质相似的稀土特征。暗色边与陨石基质的差别在于:前者富FeO而贫难熔元素。推测陨石基质与暗色边物质来源于太阳星云不同区域。与形成暗色边有关的突发性事件可能曾多次在太阳星云的不同区域中发生。

THE STUDY OF THE CHEMICAL COMPOSITIONS OF THE NINGQIANG CARBONACEOUS CHONDRITE MATRIX AND DARK RIM

The chemical compositions of the Ningqiang carbonaceous chondrite matrix and a dark rim are analysed with instrumental neutron activation method.The results indicate that there are more abundant light REE and chalcophile elements in the matrix of Ningqiang than in the whole rock sample of Ningqiang,and it roughly exhibits a similarity of REE model between the Ningqiang and Allende matrices.The difference between the dark rim and Ningqiang matrix is that the former has richer FeO and poorer refractory elements.It is deduced that the meteorite matrix and the dark rim came from different source material regions of the solar nebula.The event related to the formation of the dark rim might ever have taken place many times in the different regions of the solar nebula.