紫金山金铜矿明矾石的拉曼光谱特征

紫金山金铜矿是我国大陆首例高硫化型浅成低温热液型矿床。矿床上金下铜,金矿主要赋存在潜水面以上,与强硅化有关;铜矿主要赋存于潜水面之下,与明矾石化有关。明矾石有四种产出状态,分别为蚀变岩型、与铜硫化物共生型、后期脉状、粉末状。不同产出状态的明矾石具有不同的拉曼光谱特征和荧光散射背景。明矾石流体包裹体激光拉曼谱图显示：(1)从蚀变岩型、与铜硫矿化物共生型到后期脉状明矾石均具有明矾石特征性的谱带,只是受荧光散射影响逐渐减弱;粉末状明矾石具有与前三者不同的谱带特性,各谱带强度均较弱,荧光散射较强烈。(2)100～700 cm-1区间谱带可作为明矾石分子结构中阳离子类质同象置换的“指纹谱带”。蚀变岩型明矾石,161和234 cm-1峰变化明显,具有较广泛的Na对K的类质同象置换;与铜硫化物共生的明矾石,381和484 cm-1峰变化明显,指示Cu和Ga等阳离子对Al离子的类质同象置换;后期脉状明矾石,161, 234,484,508 cm-1峰值均比较稳定,Na对K和Si对Al的类质同象置换较少;潜水面附近的粉末状明矾石因荧光散射强烈,各个谱带强度均较弱。(3)明矾石的激光拉曼光谱和红外光谱配合使用,可为明矾石矿物研究提供完整的分子振动光谱特征,为明矾石的成因提供结构信息。在岩相学、矿相学、矿床地质、矿床地球化学、区域地质特征研究的基础上,通过明矾石的激光拉曼光谱(结合荧光散射背景)可进一步为紫金山金铜矿这个典型的高硫化型浅成低温热液矿床的形成机制提供演化进程信息。     

云南香格里拉春都斑岩型铜矿物探工作方法有效性试验分析

在斑岩型铜矿区开展物探工作问题较多,长期以来效果不理想。针对云南香格里拉春都斑岩型铜矿区,通过分析区内各岩(矿)石的物性特征,在已知主矿体勘探剖面上开展磁法、激电、自然电位方法有效性试验研究工作,总结出本区物探工作开展的思路;并将研究成果应用于周围成矿靶区,效果较好。     

山西刁泉银铜矿矿床特征及成因初探

刁泉银铜矿床位于山西灵丘县刁泉村西南,是一个由银铜矿的地质特征、矿物组成,并伴有钼、铁、铅等多金属矿床。通过对山西刁泉银铜矿区成矿特征的分析研究,探讨了该矿的地质特征和成矿机理．为矿山开采提供可靠理论依据,对同类型矿床的勘察有间接的借鉴作用。     

冬瓜山铜矿深井开采岩爆危险区分析与预测

根据冬瓜山矿床典型岩石的抗拉试验、全应力应变试验和峰值强度变形状态下的松弛试验结果以及矿床构造、岩性分布,研究了该矿床岩层的岩爆倾向性分布特征,分析了已发生的井巷岩爆特征;采用数值模拟方法,以硐室周边最大切向应力与岩石的抗压强度之比为判别指标,对采场围岩岩爆危险区进行了预测.研究结果表明矿体和矿体上盘岩石具有中等岩爆倾向,矿体下盘岩石具有弱岩爆倾向,它们都属于诱导性的岩爆;岩爆发生于具有岩爆倾向、应力大且能够产生能量突然释放的区域,主要集中于工程的交叉处附近、不同岩层的接触带附近的较坚硬岩体以及采场顶板、矿柱和采场四角的局部区域.     

汞黝铜矿的研究

汞黝铜矿产于贵州省504铀汞钼多金属矿床中的含铀—硒方解石脉中,经电子探针分析结果（％）为:S 20.12—23.46平均21.76,Cu 35.02—38.15平均36.59,Hg 13.06—16.38平均15.17,Sb 24.53—26.47平均25.61,Se 0—1.56平均0.53,As 0—0.71平均 0.24,Fe 0—0.15平均0.03.根据平均化学成分计算,其分子式为Cu_(10)(Hg_(1.43)Cu_(0.91)Fe_(0.01))_(2.35)(Sb_(3.99)As_(0.06))_4.05（S_(12.87)Se_(0.13)）_13,简化式为Cu_(10)(Hg,Cu)_2Sb_4S_(13)。     

柱芯电极光谱法测定西藏斑岩铜矿中的铜,钼,银,铅,锌,砷,钨和铋

本文研究了柱芯电极测定西藏斑岩铜矿中8个主次要元素,并与用其他电极测定的结果进行了对比实验。本文还讨论了组分影响及消除方法。对铜矿区样品测定,其RSD(n=15)为Cu±3.3%,Mo±4.1%,Ag±3.7%,Pb±6.5%。Zn±6.5%,As±7.3%,W±6.9%以及Bi±6.9%。用化学分析,外检和标样验证了方法的可靠性。     

铜矿峪矿自然崩落法放矿管理的探讨

介绍了自然崩落法的放矿过程及各阶段的特点,阐述了自然崩落法放矿管理流程,探讨了在特殊条件下应采取的特殊措施,以减少废石的混入。     

Geochronolosic constraints on masmatic intrusions and mineralization of the Zhunuo porphyry copper deposit in Gansdese, Tibet

In situ zircon U-Pb ages for the recently discovered Zhunuo porphyry copper deposit in the western part of the Gangdese metallogenic belt in Tibet were determined by sensitive high-resolution ion microprobe （SHRIMP）. The ages can be divided into two separate groups, reflecting more than four major tectono-magmatic events in the area. The 62.5±2.5 Ma age of inherited zircons may be related to the volcanic eruption of the Linzizong Group formed shortly after the India-Asia continental collision. The 50.1±3.6 Ma age most likely corresponds to the time of underplating of mantle-derived mafic magma in Gangdese. The 15.6±0.6 Ma age obtained from magmatic zircons is interpreted as the age of crystallization of the Zhunuo ore-forming porphyry. Finally, a molybdenite Re-Os isochron age of 13.72±0.62 Ma is consistent with another zircon U-Pb age of 13.3±0.2 Ma, representing the time of copper mineralization. These ages, in combination with available literature data, indicate that magmatic crystallization and copper mineralization in the Gangdese metallogenic belt became gradually younger westward, and further suggest that the Zhunuo porphyry copper deposit was formed in the same tectonic stage as other porphyry copper deposits in the eastern and central Gangdese belt. This conclusion provides critical information for future exploration of porphyry copper deposits in western Gangdese.     

Ages and tectonic significance of the collision-related granite porphyries in the Lhunzhub Basin, Tibet, China

The Paleocene collision-related granite porphyries are identified for the first time along the western margin of the Lhunzhub Basin, Tibet. SHRIMP U-Pb zircon analysis indicates that the granite porphyries were emplaced at 58.7±1.1 Ma (MSWD = 0.79) during the Indo-Asian continental collision. The granite porphyries are peraluminous and high in K, belonging to the calc-alkaline to high-K calc-alkaline series. They are relatively enriched in LILE, Th and LREE and depletion in Ba, Nb, P and Ti, characterized by LREE-enriched patterns with slightly to moderately negative Eu anomalies. These Paleocene granite porphyries are interpreted as the products generated by partial melting of the pre-existing arc crustal rocks caused by the increase of pressures and temperatures during the crustal shortening at the early stages of the Indo-Asian continental collision since 65 Ma. Despite inherited geochemical features and tectonic settings of the arc protoliths, they are significantly different from the volcanic rocks of the Dianzhong Formation within the Linzizong Group and the Miocene granite por- phyries in the Gangdise belt.