Trends of variability of garnet megacryst composition from diamond-bearing and diamond-free kimberlite pipes (Yakutia)

被引：0
|
作者：
Kostrovitsky, SI [1 ]
Mitchell, RH [1 ]
Ivanova, RN [1 ]
Suvorova, LF [1 ]
机构：
[1] LAKEHEAD UNIV,THUNDER BAY,ON P7B 5E1,CANADA
来源：
GEOLOGIYA I GEOFIZIKA | 1997年 / 38卷 / 02期
关键词：
kimberlite; megacrysts; garnet; trend of composition;
D O I：
暂无
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
The compositions of garnet megacrysts have been studied in representative collections from diverse kimberlite pipes of the Yakutian province. The megacrysts of garnet from diamond-bearing pipes show close ranes of composition and trends of variability. The megacrysts from diamond-free pipes differ in having relatively hih contents of FeO and low contents TiO2 and Cr2O3. In Mg-Fe-Ca diagram the compositions of megacrysts from diamond-bearing kimberlite form a trend parallel to the Mg-Fe axis with relatively constant Ca, while those from diamond-free kimberlite form a trend parallel to the Mg-Ca axis at relatively constant Fe. The compositions of mineral inclusions in megacryst garnets are reported and the paper considers megacryst genesis.
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页码：420 / 428
页数：9
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