| 内蒙古苏尼特左旗乌兰德勒钼(铜)矿床地质特征及找矿标志 |
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| 关键词:Ulandler geological characteristics porphyry ore deposit ore prospecting criteria Sino-Mongolian border |
| 基金项目:国家资源补偿费项目(矿调[2004]10-1)；内蒙古自治区勘查资金项目(编号: 2006-02-YS01)；地质调查项目(编号: 1212010733803） |
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| Geological Characteristics and Ore-Prospecting Criteria of the Ulandler Porphyry Molybdenum Deposit in Sonid Left Banner, Inner Mongolia |
| The Ulandler ore deposit is a medium-size porphyry molybdenum deposit discovered during the land survey in Inner Mongolia. The ore deposit with typical porphyritic mineralization characteristics shows two mineralization shapes exhibited respectively in the upper part and the lower part. The ore bodies in the upper part exhibit multilayered veinlike and stockwork forms and are hosted in the fractures of early intruded quartz diorite and granodiorite, with molybdenite assuming large foliated lamellae and small-scaly aggregates. The ore bodies in the lower part constitute the main ore bodies, assume thick layers of veinlets and disseminations, and are hosted in the intrusive contact zone between mineralizing parent fine-grained adamellite and early intruded quartz diorite. There exist typical porphyry hydrothermal alterations in the wall rocks such as potassic alteration (biotite), beresitization, greisenization and silicification, which are genetically related to the mineralization. Geochemical exploration re-veals that there are obvious concentration zones and centers of geochemical anomalies, characterized by extensive and high intensities of metallogenic elements Mo, Cu, W and Bi. High precision magnetic survey shows that the mineralization-related quartz diorite and pyritized granodiorite have strong magnetism, whereas the wall rocks biotite granite and altered granite have no or only weak magnetism. The induced electrical medium gradient survey shows that the mineralization-related fine-grained adamellite and altered granite have high excitation rate and low resistance, which can serve as the indicators in ore prospecting. The SHRIMP zircon U-Pb age of the mineraliza-tion-related fine-grained adamellite is 131.3 ± 1.6 Ma, and the Re-Os age of molybdenite in the ore deposit is 134.1 ± 3.3 Ma, suggesting that the ore deposit was formed in Lower Cretaceous. The geological, geochemical and geophysical ore-prospecting criteria and the mineralization age of the Ulandler molybdenum porphyry deposit are important clues to further ore prospecting work in this region. |
| TAO Ji-xiong,ZHONG Ren,ZHAO Yue-ming,ZHENG Bao-jun.2010.Geological Characteristics and Ore-Prospecting Criteria of the Ulandler Porphyry Molybdenum Deposit in Sonid Left Banner, Inner Mongolia[J].Acta Geoscientica Sinica,31(3):413-422. |
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