新疆尉犁县兴地Ⅲ号岩体铜镍含矿性评价及找矿远景
Cu-Ni Ore-bearing Potential Evaluation and Prospecting Potential of No.3 Xingdi Complex in Yuli County, Xinjiang
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摘要: 兴地Ⅲ号岩体位于兴地大断裂南侧, 受其次级断裂控制, 属于兴地河基性-超基性杂岩带;岩体岩相分带较丰富, 可分为辉长岩相和橄辉岩相2个岩相带, 矿化蚀变多位于橄辉岩相带。岩石类型属于拉斑玄武质岩浆系列;稀土总含量较低, 轻重稀土分异明显, 稀土元素配分模式为轻稀土富集型, 无明显的Eu异常;m/f值大于2, 有利于形成铜镍矿;在岩体中部取新鲜辉长岩岩石样品, 利用LA-ICP MS 方法获得其U-Pb同位素年龄为(716.7±2.4)Ma, 形成于陆内裂谷环境, 可能与Rodinia超大陆裂解事件有关。通过与已发现铜镍矿的Ⅱ号岩体进行对比, 发现Ⅲ号岩体也具有相似的岩相学、岩石学、稀土元素配分模式、物化探特征及矿化蚀变特征, 并且两者均形成于新元古代。因此, Ⅲ号岩体具有较好铜镍矿找矿前景。Abstract: The No.3 intrusion in Xingdi area belongs to the Xingdi River basic-ultrabasic complex belt on the south of Xingdi fault zone, of which secondary faults control the No.3 intrusion. It has abundant lithofacies zonation(gabbro facies and olivine-pyroxenite facies), and the alternations are in the olivine-pyroxenite facies. The rocks belong to tholeiite basalt with features of low total rare earth, obvious fractionation of REE and weak Eu anomaly. The m/f ratio is greater than 2, which is conducive to the formation of Cu-Ni deposit. With the U-Pb isotope age of 716.7±2.4 Ma, the gabbro selected from the No.3 intrusion is formed in an intracontinental rift, which is something to do with Rodina supercontinent breakup event. Through comparison with No.2 intrusion, where a small copper nickel ore was explored, similar features of petrography, petrology, REE distribution pattern, physic-chemical characteristics and alternation features were identified, in addition, the two intrusions were both formed in Neoproterozoic Era. So, the No.3 intrusion has fairly good prospecting potential.
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