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首页> 外文期刊>Contributions to Mineralogy and Petrology >Apatite-hosted melt inclusions from the Panzhihua gabbroic-layered intrusion associated with a giant Fe-Ti oxide deposit in SW China: insights for magma unmixing within a crystal mush
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Apatite-hosted melt inclusions from the Panzhihua gabbroic-layered intrusion associated with a giant Fe-Ti oxide deposit in SW China: insights for magma unmixing within a crystal mush

机译：普通托管的融化夹杂物，来自攀枝花古桥分层侵入与SW中国的巨型Fe-Ti氧化物矿床相关：在水晶糊状物中的岩浆解混的见解

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The similar to 2-km-thick Panzhihua gabbroic-layered intrusion in SW China is unusual because it hosts a giant Fe-Ti oxide deposit in its lower zone. The deposit consists of laterally extensive net-textured and massive Fe-Ti oxide ore layers, the thickest of which is similar to 60 m. To examine the magmatic processes that resulted in the Fe enrichment of parental high-Ti basaltic magma and the formation of thick, Fe-Ti oxide ore layers, we carried out a detailed study of melt inclusions in apatite from a similar to 500-m-thick profile of apatite-bearing leucogabbro in the middle zone of the intrusion. The apatite-hosted melt inclusions are light to dark brown in color and appear as polygonal, rounded, oval and negative crystal shapes, which range from similar to 5 to similar to 50 A mu m in width and from similar to 5 to similar to 100 A mu m in length. They have highly variable compositions and show a large and continuous range of SiO2 and FeO (t) with contrasting end-members; one end-member being Fe-rich and Si-poor (40.2 wt% FeO (t) and 17.7 wt% SiO2) and the other being Si-rich and Fe-poor (74.0 wt% SiO2 and 1.20 wt% FeO (t) ). This range in composition may be attributed to entrapment of the melt inclusions over a range of temperature and may reflect the presence of A mu m-scale and immiscible Fe-rich and Si-rich components in different proportions. Simulating results for the motion of Si-rich droplets within a crystal mush indicate that Si-rich droplets would be separated from Fe-rich melt and migrate upward due to density differences in the interstitial liquid when the magma unmixed. Migration of the Si-rich, immiscible liquid component from the interstitial liquid caused the remaining Fe-rich melt in the lower part to react with plagioclase primocrysts (An(59-60)), as evidenced by fine-grained lamellar intergrowth of An-rich plagioclase (An(79-84)) + clinopyroxene in the oxide gabbro of the lower zone. Therefore, magma unmixing within a crystal mush, combined with gravitationally driven loss of the Si-rich component, resulted in the formation of Fe-rich, melagabbro and major Fe-Ti oxide ores in the lower part and Si-rich, leucogabbro in the upper part of the intrusion.
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