| 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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| 引用本文： | 陶继雄,钟仁,赵月明,郑宝军.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[J].地球学报,2010,31(3):413-422. |
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| 作者姓名： | 陶继雄 钟仁 赵月明 郑宝军 |
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| 作者单位： | 内蒙古自治区地质调查院;内蒙古自治区地质调查院;内蒙古自治区地质调查院;内蒙古自治区地质调查院 |
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| 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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| 摘 要： | 乌兰德勒钼(铜)矿床是近几年内蒙古国土资源大调查工作中新发现的一个中型钼(铜)矿床。矿床具典型的斑岩型矿床矿化特征, 并呈现较为复杂的上下两种矿化形态。上部矿体呈多层脉状、网脉状, 赋存于早期侵入的石英闪长岩及花岗闪长岩次生裂隙中, 辉钼矿呈大叶片状、细鳞片状集合体充填于围岩裂隙或硅化脉两侧; 下部矿体较厚大, 赋存于成矿母岩即中细粒二长花岗闪长岩、细粒花岗岩与早期石英闪长岩侵入接触带中, 构成矿床中的主要矿体, 辉钼矿呈细脉状、细脉浸染状产出。矿床具有典型的斑岩蚀变类型, 钾化(黑云母化)、黄铁绢英岩化、云英岩化与矿化作用密切相关。化探工作显示, 成矿元素Mo、Cu、W、Bi元素异常分布面积及强度大, 具有明显的浓度分带和浓集中心, 构成同心环状异常。而高精度磁测表明: 与矿化有关的石英闪长岩、黄铁矿化花岗闪长岩具有强磁性, 围岩黑云母花岗岩、蚀变花岗岩则显示无-弱磁性。激电中梯测量显示与成矿有关的闪长岩、蚀变花岗岩具有高极化低电阻率特征, 为本区的重要找矿标志。与成矿作用相关的细粒二长花岗岩中锆石的SHRIMP U-Pb年龄为131.3 ± 1.6 Ma, 而矿床中辉钼矿Re-Os同位素年龄为134.1 ± 3.3 Ma, 显示该斑岩型矿床形成于早白垩世。乌兰德勒钼(铜)矿床的地、物、化找矿标志和成矿时间的确定, 为本地区下一步找矿工作的开展提供了重要借鉴。
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| 关 键 词： | 乌兰德勒 地质特征 找矿标志 斑岩型矿床 中蒙边境 |
Geological Characteristics and Ore-Prospecting Criteria of the Ulandler Porphyry Molybdenum Deposit in Sonid Left Banner, Inner Mongolia |
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| TAO Ji-xiong,ZHONG Ren,ZHAO Yue-ming and ZHENG Bao-jun.Geological Characteristics and Ore-Prospecting Criteria of the Ulandler Porphyry Molybdenum Deposit in Sonid Left Banner, Inner Mongolia[J].Acta Geoscientia Sinica,2010,31(3):413-422. |
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| Authors: | TAO Ji-xiong ZHONG Ren ZHAO Yue-ming and ZHENG Bao-jun |
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| Institution: | Inner Mongolia Geological Survey;Inner Mongolia Geological Survey;Inner Mongolia Geological Survey;Inner Mongolia Geological Survey |
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| Abstract: | 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. |
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| Keywords: | Ulandler geological characteristics porphyry ore deposit ore prospecting criteria Sino-Mongolian border |
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