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粤北茶山岩体岩石成因与铀、钨成矿潜力探讨
投稿时间:2019-02-18  修订日期:2019-11-20  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2020022
摘要点击次数: 36
全文下载次数: 37
作者单位E-mail
兰鸿锋 安徽省地质矿产勘查局327地质队 E-mail: hflan0408@sina.com 
王洪作 核工业北京地质研究院 wanghz1004@163.com 
凌洪飞 南京大学地球科学与工程学院  
陈卫锋 南京大学地球科学与工程学院  
王凯兴 东华理工大学地球科学学院  
王丹 南通大学地理科学学院  
基金项目:国家自然科学基金青年基金(编号41703042)、南京大学内生金属矿床成矿机制研究国家重点实验室开放基金(编号2017-LAMD-K06)和中国核工业地矿事业部十二五高校基础科研项目的联合资助
中文摘要:粤北诸广山地区是我国重要的花岗岩型铀矿床产地之一,该地区部分岩体亦与钨成矿关系密切。茶山岩体位于诸广山南部岩体的中北部,研究程度较低。茶山岩体锆石U-Pb年龄为148.2 ± 1.9 Ma,形成于燕山早期。岩相学上可见原生白云母。岩体富硅、略富碱,贫铁、镁、钙、磷,分异演化程度高(DI = 92.2 ~ 95.6),弱过铝质(ACNK = 1.00 ~ 1.08);稀土含量较低(∑REE = 90.5 × 10-6 ~ 163 × 10-6),Eu强烈亏损(δEu = 0.04 ~ 0.08),富集Rb、U和Ta,亏损Ba、Sr、Ti和P。以上特征表明茶山岩体属于高分异的S型花岗岩。此外,岩体εNd(t)值低(-10.6 ~ -9.4),两阶段Nd模式年龄为1.70 ~ 1.80 Ga,结合其高的Rb/Sr比值(12.6 ~ 77.3)和低的CaO/Na2O比值(0.10 ~ 0.28),这些特征表明茶山岩体可能由古元古代从地幔分离出的地壳岩石演变而成的变质泥岩部分熔融而来,并经历后期高分异作用,成岩构造背景属于燕山早期板内伸展环境。对比研究显示,茶山岩体与华南印支期产铀花岗岩和燕山期产钨花岗岩在主要地球化学指标和源区特征上相似,但其W含量较低(1.60 × 10-6 ~ 3.94 × 10-6),钨成矿潜力较小;而U含量较高(平均19.0 × 10-6),且主要以铀钍石等易淋滤的富铀矿物存在,该区断裂构造发育,岩体中晚期岩脉侵入且热液蚀变强烈。岩体西北部有明显的铀矿化显示,钻孔ZK55-4见有沥青铀矿。综上,茶山岩体具有较强的铀成矿潜力。
中文关键词:锆石U-Pb定年  茶山岩体  S型花岗岩  伸展构造环境  钨、铀成矿潜力
 
Petrogenesis of the Chashan Granite in Northern Guangdong Province and Its Implication for the Metallogenic Potential of Tungsten and Uranium Mineralization
Author NameAffiliationE-mail
LAN Hongfeng No 327 Geological Party, Anhui Bureau of Geology and Mineral Resources E-mail: hflan0408@sina.com 
WANG Hongzuo School of Geographic Science, Nantong University wanghz1004@163.com 
LING Hongfei School of Earth Sciences and Engineering, Nanjing University  
CHEN Weifeng School of Earth Sciences and Engineering, Nanjing University  
WANG Kaixing School of Earth Sciences, East China University of Technology  
WANG Dan School of Geographic Science, Nantong University  
Abstract:The southern Zhuguangshan complex pluton (SZCP) is one of the important uranium mineralization areas hosted in granitoid in China, and a few granites in SZCP show relationship with tungsten mineralization. The Chashan granite with less attention is located in the north central area of the SZCP. The LA-ICP-MS zircon U-Pb dating yields an age of 142.8 ± 1.9 Ma, suggesting that the Chashan granite was formed in the Early Yanshanian. Petrographically the Chashan granite contains commonly muscovite, and is characterized by enrichment of SiO2, mildly high alkalinity, and depletion of Fe2O3, MgO, CaO and P2O5. Geochemically it also shows the highly fractionated (DI = 92.2 ~ 95.6) and peraluminous (ACNK = 1.00 ~ 1.08) characteristics. The most of samples display low total REE contents (∑REE = 90.5 × 10-6 ~ 163 × 10-6), negative Eu anomalies (δEu = 0.04 ~ 0.08), enrichment of Rb, U and Ta, and depletion of Ba, Sr, Ti and P. Petrographical and geochemical features of these samples suggest a highly fractional S-type granite. Isotopically, the Chashan granite has low and constant εNd(t) values (-10.6 ~ -9.4) with two stage model age of 1.70 ~ 1.80 Ga. Integrated with the values of Rb/Sr (12.6 ~ 77.3) and CaO/Na2O (0.10 ~ 0.28), we suggest that the granitic magma of the Chashan granite, formed in the Early Yanshanian intraplate extensional environment, may have been derived from partial melting of metapelite originated form the ancient crust rocks separated from the mantle in the Paleoproterozoic. Based on the comparison and contrast, the Chashan granite show similar geochemical proxies with Indosinian uranium-bearing granites and Yanshanian tungsten-bearing granites in South China, but samples of the Chashan granite have extremely low tungsten concentration (1.60 × 10-6 ~ 3.94 × 10-6), indicating relatively low tungsten metallogenic potential. Those samples exhibit high uranium content (averaging 19 × 10-6) and common presence of uranium in some U-riched accessory minerals (such as uranothorite) which are prone to be leached. In addition, the faults were well and extensively developed in this area, resulting in the granite being intruded by late stage granitic dykes and experiencing significant hydrothermal alteration. Uranium mineralization found in the northwest part of the Chashan granite and pitchblende was discovered by drilling zk55-4. In conclusion, the Chashan granite shows a greater uranium metallogenic potential.
keywords:Chashan granite, Zircon U-Pb dating, S-type granite, extensional environment, metallogenic potential of tungsten and uranium
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