云南哀牢山和新疆可可托海伟晶岩矿物中熔融包裹体电子探针研究

云南哀牢山和新疆可可托海伟晶岩矿物中熔融包裹体电子探针研究

李兆麟1，张文兰2，李文1 2，翟伟1，石贵勇1，

1. 中山大学地球科学系，广州，510275；2. 南京大学金属成矿作用国家重点实验室，江苏南京， 210093

收稿日期:2000-12-20 修回日期:2000-12-20 出版日期:2000-12-20 发布日期:2000-12-20

Electronic Microprobe Study on the Melt Inclusions in Pegmatite Minerals from Ailaoshan and Keketuohai Pegmatite Deposits

LI Zhao-Lin1;2, ZHANG Wen-1an2, LI Wen1;2, ZHAI Wei1, SHI Gui-yong1

1. Department of Earth Sciences, Zhongshan University, Guangzhou 510275; 2. State Key Laboratory for Mineral Deposits Research, Nanjing University, Nanjing 210093

Received:2000-12-20 Revised:2000-12-20 Online:2000-12-20 Published:2000-12-20

摘要/Abstract

摘要： 运用电子探针测定了云南哀牢山伟晶岩和新疆可可托海伟晶岩矿物中熔融包裹体及流体-熔融包裹体子矿物成分。据73个包裹体中120个测点分析结果，鉴定出锌尖晶石、刚玉、磷灰石、磁铁矿、白云母、黑云母、钾长石、钠长石、绿柱石和石英等10种子矿物，并确定矿物组合27个。其中锌尖晶石、刚玉在两地区伟晶岩熔融包裹体中属首次发现，磷灰石成分属首次测定。两地伟晶岩矿物的熔融及流体-熔融包裹体中子矿物成分及矿物组合各异，包裹体中子矿物与主矿物的化学成分存在一定演化规律，可作为了解伟晶岩浆结晶分异作用、元素演化规律的依据。研究表明，伟晶岩存在局部岩浆分异作用，岩浆具不混溶性及非均匀性。此成果对了解伟晶岩物质成分、形成机制及成因研究具重要意义。对岩浆岩、地幔岩及陨石研究也有一定启迪。

Abstract: The compositions of daughter minerals in melt an d fluid-melt inclusions in minerals from Ailaoshan pegmatite, Yunnan Provinc e and Keketuohai pegmatite, Xinjiang Autonomous Region were analyzed by electron ic microprobe. 120 analytical points from 73 inclusions we re analyzed. 10 daughter minerals (including zinc-spinel, corundum, apatite, ma gnetite, muscovite, biotite, microcline, albite, quartz and alumo silicate glass) and 27 minera l assemblages were identified. Zinc-spinel and corundum were identified for the first time in these regions. The analytical results indicate that the daughter mineral compositions and mineral assemblages in melt and fluid-melt incl usions vary with different types of pegmatites. The evolution patterns in compositions of daughter minerals and host minerals could be used as a basis to search for the evolution patterns of chemical elements during pegmatite cr ystallization. The existence of local magmatic differentiation, immiscibility an d heterogeneity was proved for the pegmatite magmas. The results of this study are significant in understanding the compositions, forming mechanism s and origins of pegmatites. It would a lso inspire further studies on magmatites, pyrolites and meteorites.

李兆麟，张文兰，李文，翟伟，石贵勇， . 云南哀牢山和新疆可可托海伟晶岩矿物中熔融包裹体电子探针研究 [J]. J4.

LI Zhao-Lin1;2, ZHANG Wen-1an2, LI Wen1;2, ZHAI Wei1, SHI Gui-yong1. Electronic Microprobe Study on the Melt Inclusions in Pegmatite Minerals from Ailaoshan and Keketuohai Pegmatite Deposits[J]. J4.