After studying systematically petology, mineralogy, perochmistry. REE geocheminstry and strontium, sulphur, lead isotope of the alkali-rich granite prophyry distributed extensively in the Yangtze platfrom western mar...After studying systematically petology, mineralogy, perochmistry. REE geocheminstry and strontium, sulphur, lead isotope of the alkali-rich granite prophyry distributed extensively in the Yangtze platfrom western margin’s alkali-rich granite porphyry, we point out that the alkallurich granite porphyry have the properties of new intrusive era. Range of the isotope age is from 36 Ma to 51 Ma. They belong to the Himalaya date. Main mineral componets of the alkali-rich granite porhyry consist of K-feldspar (35% - 45% ), quartz (36%±), plagloclase (15%±) and biotite (10%±). Accessary minerals of the rock belong to type of xenotime-zircon-monayite. Chemical composition of the alkali-rich granite porphyry are SiO2-poor Al2O3-rich and alkalisirich, sufficeient patassiunl, (K2O+Na2O) range of the alkali-rich granite porphyry is 8. 59%～11. 27%. Average is 9. 85%. The REE total of the alkali-rich granite porphyry is less. Average coefficient is 0. 52. The REE distribution Pattern is a smooth curve steeply sloping to right (87Sr/86Sr)i＝0. 7073. The lead is from the upper mantle. Range of the sulphur isotope δ34S%, is harrow and is close to aerolite--sUlphurcomposition. The petrogenic substances possibly come from the upper mantle. Petrogentictype belongs to "A" type of granite.展开更多
根据岩石成分与磁性,已将个旧花岗岩杂岩体划分为高磁性与低磁性两大系列:第一组高磁性相,很可能属于特殊的Ⅰ型花岗岩,并与氧化型夕卡岩锡矿的形成有关;第二组低磁性相,属于 S 型花岗岩,与还原型锡石硫化物夕卡岩锡矿的形成有关。在矿...根据岩石成分与磁性,已将个旧花岗岩杂岩体划分为高磁性与低磁性两大系列:第一组高磁性相,很可能属于特殊的Ⅰ型花岗岩,并与氧化型夕卡岩锡矿的形成有关;第二组低磁性相,属于 S 型花岗岩,与还原型锡石硫化物夕卡岩锡矿的形成有关。在矿物共生组合分析、相平衡、相图研究的基础上,系统地测定了个旧主要工业类型锡矿床(还原型锡石硫化物夕卡岩锡矿)形成的热力学参数,阐明其成因机理,还原夕卡岩主要造岩硅酸盐矿物钙铁辉石,通过反应(3)进行硫化反应,形成大量的磁黄铁矿。这是一条硫的缓冲平衡反应曲线,因此,所有热力学参数,如温度、硫逸度、氧逸度等均在比较严格和狭窄的范围内变化。通过自然界反应的产物证实了 Gamble 相图的应用范围。展开更多
文摘After studying systematically petology, mineralogy, perochmistry. REE geocheminstry and strontium, sulphur, lead isotope of the alkali-rich granite prophyry distributed extensively in the Yangtze platfrom western margin’s alkali-rich granite porphyry, we point out that the alkallurich granite porphyry have the properties of new intrusive era. Range of the isotope age is from 36 Ma to 51 Ma. They belong to the Himalaya date. Main mineral componets of the alkali-rich granite porhyry consist of K-feldspar (35% - 45% ), quartz (36%±), plagloclase (15%±) and biotite (10%±). Accessary minerals of the rock belong to type of xenotime-zircon-monayite. Chemical composition of the alkali-rich granite porphyry are SiO2-poor Al2O3-rich and alkalisirich, sufficeient patassiunl, (K2O+Na2O) range of the alkali-rich granite porphyry is 8. 59%～11. 27%. Average is 9. 85%. The REE total of the alkali-rich granite porphyry is less. Average coefficient is 0. 52. The REE distribution Pattern is a smooth curve steeply sloping to right (87Sr/86Sr)i＝0. 7073. The lead is from the upper mantle. Range of the sulphur isotope δ34S%, is harrow and is close to aerolite--sUlphurcomposition. The petrogenic substances possibly come from the upper mantle. Petrogentictype belongs to "A" type of granite.
文摘根据岩石成分与磁性,已将个旧花岗岩杂岩体划分为高磁性与低磁性两大系列:第一组高磁性相,很可能属于特殊的Ⅰ型花岗岩,并与氧化型夕卡岩锡矿的形成有关;第二组低磁性相,属于 S 型花岗岩,与还原型锡石硫化物夕卡岩锡矿的形成有关。在矿物共生组合分析、相平衡、相图研究的基础上,系统地测定了个旧主要工业类型锡矿床(还原型锡石硫化物夕卡岩锡矿)形成的热力学参数,阐明其成因机理,还原夕卡岩主要造岩硅酸盐矿物钙铁辉石,通过反应(3)进行硫化反应,形成大量的磁黄铁矿。这是一条硫的缓冲平衡反应曲线,因此,所有热力学参数,如温度、硫逸度、氧逸度等均在比较严格和狭窄的范围内变化。通过自然界反应的产物证实了 Gamble 相图的应用范围。
