| Composition characteristics and significance of spinel in the kinibcrlite from No. 30 Pipe in the wafangdian area. China北大核心CSCD |
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| 作者单位： | 1.State Key Laboratory for Mineral Deposit Research, School of Earth Science and Engineering, Nanjing University, Nanjing210023;2.Sixth Geological Brigade in Liaoning Province, Dalian116200; |
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| 摘 要： | The spinel coexisting with diamonds is often used as indicator mineral to evaluate the diamond-bearing potentiality of the kimberlite. In order to figure out the characteristics of spinels in the No. 30 kimberlite pipe, this paper has carried out detailed morphological observation and electron probe analysis on the spinels. The results show that spinels are elliptical and sub-Angular grains, with large particle diameter( 5(H)-1000 μm). A small amount of spinels shows erosional embay men t shape. With high contents of Cr2O3( up to 66. 56% ) and MgO ( 8. 88% - 16. 68% ) , and low TiO2, contents (mostly
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