西藏尼木斑岩铜多金属矿区岩浆岩地球化学特征及成因探讨
发布时间：2018-08-20 07:26
【摘要】：西藏尼木斑岩铜多金属矿区位于冈底斯铜钼多金属成矿带中段,具典型斑岩型铜矿床矿化特征。区内岩浆岩从酸性到中酸性均有出露,通过对不同类型岩浆岩主量、微量、稀土元素的分析测试结果显示,其SiO_2变化于57.94%~70.12%,平均为67.63%,K_2O+Na_2O变化于6.68×10~(-6)~8.84×10~(-6),平均约7.97×10~(-6),多属高钾钙碱性岩石;各类岩石中W、Pb、Th,Ba、As、Sb、Bi、Ag、Rb、Te、Cs、Hf明显富集,而Ta、V、Hg、Au、Sc、Cr、Co、Ni、Nb、Mo等明显贫化;稀土总量变化于89×10~(-6)~427×10~(-6),稀土配分曲线呈明显的右倾型,轻稀土相对富集,基本无Eu异常。里特曼指数(δ)-戈蒂尼指数(τ )关系图、(Yb+Ta)-Rb、(Y+Nb)-Rb构造环境判别图均显示其形成于岛弧环境造山带环境;A-C-F图解显示为I-S型过渡型,相对偏向于S型。综合分析认为区内岩浆岩应为青藏高原隆升中地壳部分融熔的产物,可能为同源、同构造环境下岩浆分异的结果。
[Abstract]:Nimu porphyry copper polymetallic deposit in Tibet is located in the middle section of the Gangdis Cu-Mo polymetallic metallogenic belt, which is characterized by mineralization of typical porphyry copper deposits. The magmatic rocks in this area are exposed from acid to intermediate acidity. The main quantity, trace and rare earth elements of different types of magmatic rocks are analyzed and tested. The results show that the SiO_2 of magmatic rocks varies from 57.940.12 to 70.12, with an average of 67.63g / kg K _ 2O Na_2O at 6.68 脳 10 ~ (-6) 8.84 脳 10 ~ (-6) and an average of about 7.97 脳 10 ~ (-6), which are mostly high-potassium calc-alkaline rocks. In all kinds of rocks, WPbPbPbPbPbPbPbSbSbSbSbHf is obviously enriched, while Tahvu HgSG-SCC / NiNiNbHf is obviously depleted, the total amount of rare earth varies from 89 脳 10 ~ (-6) 427 脳 10 ~ (-6), the distribution curve of rare earth is obviously right-tilted, light rare earth is relatively enriched, and there is basically no EU anomaly. The Ritman exponent (未) -Godini exponent (蟿) relation diagram, (Yb Ta) -Rb and (Y Nb) Rb tectonic environment discriminant diagram all show that they are formed in the island arc environment and the A-C-F diagram shows that they are I-S type transition type and relatively inclined to S type. It is considered that the magmatic rocks in the area should be the product of partial melting of the crust in the uplift of the Qinghai-Tibet Plateau, which may be the result of magmatic differentiation in the same tectonic environment.
【作者单位】： 中国有色金属工业昆明勘察设计研究院;
【基金】：云南省科技计划项目资助
【分类号】：P618.2;P588.1
[Abstract]:Nimu porphyry copper polymetallic deposit in Tibet is located in the middle section of the Gangdis Cu-Mo polymetallic metallogenic belt, which is characterized by mineralization of typical porphyry copper deposits. The magmatic rocks in this area are exposed from acid to intermediate acidity. The main quantity, trace and rare earth elements of different types of magmatic rocks are analyzed and tested. The results show that the SiO_2 of magmatic rocks varies from 57.940.12 to 70.12, with an average of 67.63g / kg K _ 2O Na_2O at 6.68 脳 10 ~ (-6) 8.84 脳 10 ~ (-6) and an average of about 7.97 脳 10 ~ (-6), which are mostly high-potassium calc-alkaline rocks. In all kinds of rocks, WPbPbPbPbPbPbPbSbSbSbSbHf is obviously enriched, while Tahvu HgSG-SCC / NiNiNbHf is obviously depleted, the total amount of rare earth varies from 89 脳 10 ~ (-6) 427 脳 10 ~ (-6), the distribution curve of rare earth is obviously right-tilted, light rare earth is relatively enriched, and there is basically no EU anomaly. The Ritman exponent (未) -Godini exponent (蟿) relation diagram, (Yb Ta) -Rb and (Y Nb) Rb tectonic environment discriminant diagram all show that they are formed in the island arc environment and the A-C-F diagram shows that they are I-S type transition type and relatively inclined to S type. It is considered that the magmatic rocks in the area should be the product of partial melting of the crust in the uplift of the Qinghai-Tibet Plateau, which may be the result of magmatic differentiation in the same tectonic environment.
【作者单位】： 中国有色金属工业昆明勘察设计研究院;
【基金】：云南省科技计划项目资助
【分类号】：P618.2;P588.1
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