西藏龙马拉Pb-Zn-Fe-Cu多金属矿床 S、Pb 同位素组成及其地质意义*

龙马拉矿床是冈底斯北缘Pb-Zn-Ag-Cu-Fe成矿带东侧的矽卡岩型多金属矿床。对该矿床矿石矿物进行S、Pb同位素分析表明,其金属硫化物的S同位素组成均一,δ34S为1.6‰～3.6 ‰,显示出岩浆硫的特征。矿石矿物206Pb/204Pb、207Pb/204Pb、208Pb/204Pb范围分别为18.6488～18.6572、15.7112～15.7166、39.1599～39.1763。Pb同位素组成变化范围较小,显示Pb同位素来源于同一岩浆源区。在Pb构造模式图上靠近上地壳演化线。龙马拉矿床的S、Pb同位素数据暗示,成矿物质主要来自上地壳,可能存在地幔源区物质的混入。     

四氧化三钴@碳化蝶翅的制备及催化高氯酸铵分解的性能

采用水热法制备了四氧化三钴@碳化蝶翅(Co_3O_4@CW)纳米复合材料。利用X射线衍射仪(XRD)、场发射扫描电子显微镜(FESEM)、透射电子显微镜(TEM)、比表面及孔径分析仪表征了其结构和成分。采用同步热分析仪(DSC-TG)研究了该复合材料对高氯酸铵(AP)热分解的催化性能。结果表明,Co_3O_4@CW具有微孔-介孔-大孔的多级孔结构,Co_3O_4纳米粒子均匀紧密地负载于碳化蝶翅的骨架上,其中Co_3O_4的负载量约为72.0%。Co_3O_4@CW可显著降低AP的高温分解峰温度,当Co_3O_4@CW的添加量为3%时,AP的高温分解峰提前147℃,AP的热分解放热量从173.4 k J·mol~(-1)增加到369.3 k J·mol~(-1),表现出了良好的催化性能。     

Characteristics of soure region and tectonic implications of Early Indosinian Weiya gabbroic rock, eastern Tianshan mountains

Based on the detailed petrographic study, the characteristics of source region of the Weiya gabbro and tectonic implications were studied. The results show that the gabbroic rock consists mainly of gabbro, with less amount of ultra-mafic rocks. The ultra-mafic rocks show cumulate texture and are gradually transitional contact with gabbro, indicating that they are cumulate products of parental magma. The ultra-mafic rocks consist mainly of spinel periodite and spinel clinopyroxenite. The former is mainly composed of olivine （65%-70%）, spinel （10%-15%）, hornblende （5%-10%） and phlogopite （5%-10%）; the latter consists mainly of clinopyroxene （70%-80%）, spinel （15% 20%） and phlogopite （0-10%）, with minor amounts of carbonate （0-2%）. No olivine or orthopyroxene is found. The gabbro is composed mainly of clinopyroxene （35%-40%）, plagioclase （An 55-65, 40%-45%）, hornblende （5%-15%）, with variable amounts of carbonate （0-5%）. Petrographic observations show that the source region of the Weiya gabbroic rock is water-rich due to intensive intra-continental A-type subduction occurring in this region during late Permian to early Triassic.     

西藏龙马拉多金属矿床硫、铅同位素组成及其地质意义

龙马拉矿床是冈底斯北缘Pb-Zn-Ag-Cu-Fe成矿带东侧的矽卡岩型多金属矿床。对该矿床矿石矿物进行S、Pb同位素分析表明,其金属硫化物的S同位素组成均一,δ34S为1.6‰～3.6‰,显示出岩浆硫的特征。矿石矿物206 Pb/204 Pb、207 Pb/204 Pb、208 Pb/204 Pb范围分别为18.648 8～18.657 2、15.711 2～15.716 6、39.159 9～39.176 3。Pb同位素组成变化范围较小,显示Pb同位素来源于同一岩浆源区。在Pb构造模式图上靠近上地壳演化线。龙马拉矿床的S、Pb同位素数据暗示,成矿物质主要来自上地壳,可能存在地幔源区物质的混入。