中文摘要：

新疆阿尔泰可可托海3号脉不同结构带及其蚀变围岩中电气石化学组成电子探针（EMPA）分析结果显示,蚀变围岩、外接触带和内接触带中电气石为是富钙-铁的镁电气石,电气石化伟晶岩中电气石为富镁-铁的锂电气石,伟晶岩早期结构带（Ⅰ-Ⅳ带）中电气石为黑电气石-锂电气石系列,而伟晶岩晚期结构带（Ⅴ-Ⅶ带）中电气石为锂电气石。蚀变围岩、外接触带和内接触带中电气石以Y位中低Al,高Mg、Ca以及显著低的Al/（Al＋Fe）、Fe/（Fe＋Mg）比值为特征,主要存在R3＋＋O2-=R2＋＋OH-的置换;伟晶岩内部结构带（Ⅰ-Ⅶ带）中电气石以Y位上极低Mg、Ca,高Fe、Al、Li以及显著高的Al/（Al＋Fe）、Fe/（Fe＋Mg）比值为特征,主要存在＋Al3＋=Na＋＋Fe（Mg）2＋和Li＋＋Al3＋=Fe（Mn）2＋＋Mg2＋的置换。蚀变围岩、外接触带和内接触带中电气石化学组成特征指示存在围岩-流体、围岩-熔体相之间的相互作用。伟晶岩早期结构带（Ⅰ-Ⅳ带）中电气石无明显组成分带,为岩浆成因;晚期结构带（Ⅴ-Ⅶ带）中电气石显示振荡环带,形成于岩浆-热液过渡阶段体系。随着伟晶岩由外向里固结,温度逐渐降低,伟晶岩内部结构带中电气石显示Y位上Al、Li、Mn及Fe/（Fe＋Mg）比值逐渐增大的演化趋势;内部结构带中电气石几乎不含Mg,指示3号伟晶岩脉岩浆-热液演化是在相对封闭体系中进行的。

英文摘要：

Chemical compositions of tourmalines, determined by electron microprobe, show that tourmalines from the altered country-rock, exo- and internal-contact zones are Ca- and Fe-rich dravite, from the tourmalized pegmatite are Mg- and Fe-rich elbaite, from the early formed textural zones（Ⅰ-Ⅳ） are schorl-elbaite solid solution series, and from the late formed textural zones（Ⅴ-Ⅶ） are elbaite. Tourmalines from the altered country-rock, exo- and internal- contact zones are characterized by low Al, high Mg and Ca in Y site, and very low ratios of Al/（Al＋Fe） and Fe/（Fe＋Mg）, represented by substitution of R3＋＋O2-=R2＋＋OH-, indicating that the origin of tourmalines were associated with interactions between country-rock and exsolved magmatic fluid, and/or between country-rock and pegmatite-forming melt. Tourmalines from the internal textural zones（Ⅰ-Ⅶ） of pegmatite are featured by very low Mg and Ca, high Fe, Al and Li in Y site, and very high ratios of Al/（Al＋Fe） and Fe/（Fe＋Mg）, represented by substitution of ＋Al3＋=Na＋＋Fe（Mg）2＋ and Li＋＋Al3＋=Fe（Mn）2＋＋Mg2＋, respectively. Touramlines from the early formed textural zones（Ⅰ-Ⅳ） of pegmatite are magmatic in origin, showing no zonation in chemical compositions, but tourmalines from the late formed textural zones（Ⅴ-Ⅶ） of pegmatite were magmatic-hydrothermal in origin, featured by oscillatory zonation. As solidification of pegmatite from the outer to the inner, it shows that Al, Li and Mn in Y site and Fe/（Fe＋Mg） ratio of tourmalines increase with decreasing temperature gradually. As no Mg in Y site of tourmalines from the internal textural zones, it indicates that the magmatic-hydrothermal evolution of Koktokay No.3 pegmatite proceeded in a relatively closed system.