摘要
压力5—47 kbar,温度800—1345℃范围内,对西藏日喀则地区拉斑玄武岩进行熔融实验研究,确定了熔融曲线和高压矿物相关系。低压下(低于13 kbar)斜长石和橄榄石为稳定相。固相线以上,压力高于13 kbar,斜长石、橄榄石相继消失。压力超过25kbar,出现了石榴石。用电子探针法分析熔融样品中的玻璃成分,发现液相成分随着压力升高而变化,Na_2O和K_2O的含量增长。
Melting relationships in an olivine tholeiite from the Xigaze area, Tibet have been studied at 5-47 kb and 800-1345℃. The melting curve for this tholeiite has also been established. At low pressures (<13kb) olivine and plagioclase are present as stable phases. Above 25kb garnet appears on the liquidus. Basaltic glass was analyzed by means of microprobe. It has been revealed that the liquid composition changes with elevating pressure. The contents of Na2O and K2O in the liquid phase increase with pressure.
出处
《地球化学》
CAS
CSCD
北大核心
1989年第1期20-26,共7页
Geochimica
