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本文研究了2个富钙长石-橄榄石型包体和2个富黄长石-尖晶石型和富尖晶石-辉石型包体(分别来自宁强和南极格罗夫山碳质球粒陨石)的矿物岩石学特征,并对它们进行了对比。富钙长石-橄榄石型包体的矿物模式组成具有富橄榄石和缺失黄长石的特征,其可能是球粒和典型难熔包体之间的中间产物,是认识它们之间相互关系的钥匙。矿物岩石学特征表明富黄长石-尖晶石型和富尖晶石-辉石型包体可能是星云直接凝聚的产物,而富钙长石-橄榄石型包体经历过熔融结晶过程。富钙长石-橄榄石型包体的初始物质可能是富Al的球粒或含难熔组分的蠕虫状橄榄石集合体。矿物化学组成对比研究发现,GRV 022459-RI6中的尖晶石具有最富FeO的特征,表明包体的蚀变可能发生在高氧逸度的星云环境。
In this paper, two calc-rich feldspar-olivine inclusions and two feldspar-spinel-rich and spinel-rich spheroidal inclusions (respectively from Ningqiang and Antarctic Grove Hills carbonaceous spheres Meteorite) mineralogy and petrology characteristics, and compared them. The mineral model of the calc-rich feldspar-olivine inclusions is characterized by olivine-rich and missing-feldspar, which may be intermediate between pellets and typical refractory inclusions and is the key to understanding their interrelationships. The mineralogy and petrological characteristics indicate that the feldspar-spinel-type and spinel-pyroxene-rich inclusions may be the products of the direct condensation of nebula, while the calc-rich feldspar-olivine inclusions undergo melt crystallization. The starting material of the calcium-rich feldspar-olivine inclusions may be Al-rich spherulites or worm-like olivine assemblages containing refractory components. The comparison of mineral chemistry shows that the spinel in GRV 022459-RI6 is the most FeO-rich one, indicating that the alteration of inclusions may occur in the high-oxygen fugacity nebula environment.