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作 者:张苏恒 徐争启[1,2,3] 尹明辉 徐伟[4] 田建民 李涛 Zhang Suheng;Xu Zhengqi;Yin Minghui;Xu Wei;Tian Jianmin;Li Tao(College of Earth Sciences,Chengdu University of Technology,Chengdu Sichuan 610059,China;Key Laboratory of Geosciences and Nuclear Technology of Sichuan Province,Chengdu,Sichuan 610059,China;Key Laboratory of Earth Exploration and Information Technology,Ministry of Education,Chengdu,Sichuan 610059,China;280 Institute of Nuclear Industry,Guanghan,Sichuan 618300,China)
机构地区:[1]成都理工大学地球科学学院,四川成都610059 [2]地学核技术四川省重点实验室,四川成都610059 [3]地球勘探与信息技术教育部重点实验室,四川成都610059 [4]核工业280研究所,四川广汉618300
出 处:《矿物岩石》2021年第3期49-60,共12页Mineralogy and Petrology
基 金:四川省应用基础研究项目“四川冕宁—攀枝花地区新元古代铀成矿作用及成矿机理研究”(2020YJ0361);国家自然科学基金项目“康滇地轴粗粒晶质铀矿标型特征及形成机理”(41872079);中国核工业地质局科研项目“康滇地轴新元古代铀成矿关键控矿因素研究”(201807)。
摘 要:菁角地处于兴义市雄武背斜核部南东翼南西段,大地构造位置位于扬子板块与华南板块的结合部。前人主要对该地区的金矿进行了矿点地质特征、构造特征、矿体形态等方面的研究,但对岩石学特征、铀的赋存形式以及地球化学特征研究较少。本次研究利用TIMA扫面、显微镜下观察、地球化学分析等方法对矿石、围岩的岩石学特征、地球化学特征、风化作用和分选、源区岩石类型、铀的赋存形式等方面进行探究。TIMA扫面以及显微镜下观察的结果表明铀的赋存形式是以弥散状充填进黏土化(高岭石)裂隙中。菁脚地区地球化学分析显示,龙潭组砂岩中w(SiO_(2))为51.30%-91.55%,围岩主要类型为亚岩屑砂岩,矿石以及矿化岩石为岩屑砂屑岩,CIA(73.83-82.53)以及ICV指数表明矿石及矿化岩石较围岩成熟度高、风化程度强。测试样品均有较强的U正异常,含量为4.78-772.00×10^(-6),且U与ΣREE,Sb元素呈现明显正相关,Zr与ΣREE呈强的正相关(R=1)。菁角地区铀的来源是热液在上升过程中萃取围岩中的铀,沿着层间构造破碎带充填进成熟度较高的黑色砂岩中富集而成,结合菁角地区岩石学特征、地球化学特征以及铀的赋存形式,推测菁脚金(铀)矿床为低温热液矿床。Located at the junction of Yangtze plate and South China plate,the Jingjiao Au(U)deposit occurs in the southeast limb of the Xiongwu anticline in Xingyi City.Previous studies have mainly focused on the geological features,structural features and ore-body morphology of the gold deposits in the area,but few on the petrological features,occurrence forms and geochemical characteristics of uranium.In this paper,TIMA scanning,microscopic observation,geochemical analysis and other methods are used to explore such characteristics as the petrology,geochemistry,weathering and separation of ores and surrounding rocks,rock types in the source area,occurrence forms of uranium and other aspects.TIMA scanning analysis and microscopic observations indicate that uranium occurs in the form of dispersive filling in clay(kaolinite)fractures.The main type of surrounding rock is lithic sandstone,and the ore-bearing and mineralized rocks are litharenite.CIA(73.83-82.53)and ICV index shows that the ore and mineralized rocks are more mature and weathered than the surrounding rocks.Geochemical analysis shows that the content of SiO_(2) in the Longtan Formation sandstone is 51.30%-91.55%.There is a strong positive anomaly of U in all samples,with the content of 4.78-772×10^(-6).The U is positively correlated withΣREE and Sb,and Zr has a positive correlattion withΣREE(R=1).It is proposed that the source of uranium in Jingjiao area is extracted from the surrounding rock during the rising process of hydrothermal solution and it is enriched in the high mature black sandstone along the interlayer fracture zones.Based on the petrological and geochemical characteristics and the occurrence form of uranium in Jingjiao area,it is speculated that the Jingjiao Au(U)deposit is a low temperature hydrothermal deposit.
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