中文摘要：

西藏班公湖带多不杂铜矿床是新近发现的具有超大型远景的典型富金斑岩铜矿床。金红石是富金斑岩铜矿中最特征的副矿物之一，对其结构和成分的研究可以反演成矿流体演化过程并确定斑岩铜矿的主矿体。在详细的野外地质考察基础上，对钾化带、强粘土化叠加钾化带样品中的金红石研究表明，金红石主要发育在黑云母斑晶中及其附近，呈不规则状、颗粒状（粒径约5～20μm）、长条状（一般长10-50μm，宽3-5μm）等。电子探针分析数据显示，多不杂富金斑岩铜矿中的金红石相对富集SiO2、V2O3、FeO，SiO2含量（质量分数，不同）在0．04％～4．40％范围之内；V2O3介于0．39％～1．13％，FeO为0．51％～3．01％；而其他成分相对较少，CaO 0．02％～2．71％，MnO最高可达0．2％，SnO 0．1％，A12O3最高达1．97％，MgO 0．96％，Cr2O3 0．63％，KzO 一般0．11％～0．49％，Na2O一般0．1％～0．23％，CuO最高可达0．56％，不含NiO。Fe、A1、V、Sn、Cr、Si、Cu原子数与Ti表现出很好的负相关性，表明这些原子替代金红石的Ti而占据晶格；而金红石中K、Na、Ca较高则可能是由于补偿电荷平衡而进入金红石的晶格。金红石较高含量的CuO、K2O、Na2O，表明成矿热液富含Cu、K和Na，同时也暗示金红石在钾化带中形成。金红石与黑云母密切的关系表明，大多数金红石形成于黑云母蚀变或者重结晶的过程中。另外，多不杂富金斑岩型铜矿床矿体中的金红石w（V2O3）〉0．4％，表明金红石中的V含量有助于确定斑岩铜矿中主矿体的范围，从而具有重要的找矿意义。

英文摘要：

The Duobuza copper deposit discovered recently in Tibet is a typical gold-rich porphyry copper deposit with superlarge prospect. The rutile formed during hydrothermal alteration is one of the most characteristic accessory minerals in this deposit, and the texture and composition of rutiles may reflect the evolutionary process of the ore-forming fluid and hence can be used as a guide to locate the principal ore body. On the basis of detailed field work, the authors studied rutiles from the potassic alteration zone and the intense argillic alteration superimposed potassic alteration zone, and the results indicate that ruffles occur in biotite phenocrysts and nearby places, and show irregular, grained （with the length and width being approximately 5- 20μm） and striped （with the length being approximately 10--50 μm and width 3--5μm） forms. Electron microprobe analyses show that rutiles are relatively enriched in SiO2, V2O3 and FeO, with SiO2 ranging from 0.04% to 4.40%, V2O3 from 0.39% to 1.13%, and FeO from 0.51% to 3.01%. However, the concentrations of CaO, MnO, SnO, Al2O3, MgO, Cr2O3, K2O, Na2O and CuO are relatively poor, with CaO from 0.02% to 2.71%, and MnO, SnO, Al2O3, MgO and Cr2O3 as high as 0.2 %, 0.1%, 1.97 %, 0.96 % and 0.63 %, respectively. In general, K2O and Na2O values vary in the ranges of 0.11% --0.49% and 0.1% --0.23% respectively, CuO can be as high as 0.56 %, and NiO is absent. Moreover, Fe, Al, V, Sn, Cr, Si and Cu show evident negative correlations with Ti, suggesting that these atoms have replaced Ti in rutile and possessed the crystal lattice. However, the relatively high concentrations of K, Ca and Na in rutile might have resulted from the compensating charge e- quilibrium. Rutiles mostly occur in the potassic alteration zone and have relatively high concentrations of CuO, K20 and Na20, suggesting that the ore-forming magmatic-hydrothermal solution was enriched in Cu, K, Na, and that ruffles were formed in the potassic alteration zone. The intimate relationship between biotite and