粤北长江花岗岩型铀矿田沥青铀矿原位U-Pb年代学研究及其地质意义
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摘要
花岗岩型铀矿床是我国重要的工业铀矿床类型,广泛分布于南岭地区。粤北长江铀矿田位于南岭中段诸广山岩体中南部,是我国典型的花岗岩型铀矿田。由于铀矿物在化学组成和成因上的固有属性,前人通过传统的铀矿物U-Pb同位素定年获得的成矿年龄(157～52Ma)变化范围较大且分散,难以有效约束精确的铀成矿时代。本文在精细矿物学研究的基础上,对长江铀矿田棉花坑、书楼坵和长排三个铀矿床的沥青铀矿开展了LA-ICP-MS原位微区U-Pb同位素定年研究。结果表明,棉花坑矿床成矿年龄为60. 8±0. 6Ma和66. 8±1. 6Ma,书楼坵矿床成矿年龄为71. 4±1. 3Ma和74. 4±1. 7Ma,长排矿床成矿年龄为62. 4±2. 5Ma和70. 2±0. 5Ma,总体分为～75Ma、～70Ma和～60Ma三期成矿年龄,代表了华南花岗岩型铀矿的晚期铀矿化。长江铀矿田成矿时代与诸广地区北东向断裂带、断陷盆地的强烈拉张时期(80～60Ma)同步,指示区内铀矿化与南岭地区晚白垩世-古近纪地壳拉张作用有关,区内铀成矿的幔源矿化剂CO_2来自区域性北东向断裂带的拉张作用。综合前人资料,认为诸广地区的铀成矿具同时性和多期性特征,成矿峰期为～140Ma、～125Ma、～105Ma、～90Ma和80～60Ma,成矿统一受制于华南岩石圈伸展的动力学背景,诸广山-南雄盆山体系白垩-古近纪的构造演化可能是促使区域铀矿化形成的主要因素。
Granite-type uranium deposit is an important industrial type of uranium deposit in China,which is widespread in the Nanling region. The Changjiang uranium ore field,which located at central-south of Zhuguangshan complex in Nanling region,is one of representative granite-type uranium ore fields of South China. Because of the nature of mineral chemical composition and origin of uranium minerals,the ore-forming ages( 157 ～ 52 Ma) obtained by conventional U-Pb isotopic dating in previous literature showed a wide range and failed to reveal the ore-forming ages for Changjiang uranium ore field. In this paper,we carry out detailed investigations upon updated mineralogy and in-situ U-Pb geochronology of uraninite. U-Pb ages of uraninite in six typical uranium ore samples stretch across a narrow number range( Mianhuakeng deposit of 60. 8 ± 0. 6 Ma and 66. 8 ± 1. 6 Ma,Shulouqiu deposit of 71. 4 ± 1. 3 Ma and74. 4 ± 1. 7 Ma,Changpai deposit of 62. 4 ± 2. 5 Ma and 70. 2 ± 0. 5 Ma),suggesting the main uranium mineralization likely occurred at three stages of ～ 75 Ma, ～ 70 Ma and ～ 60 Ma. These new in-situ U-Pb ages of uraninite,which represent the late uranium mineralization of granite-type uranium deposit in South China,are synchronous with the extension period( 80 ～ 60 Ma) of NE-trending fault subsidence zones and fault basins in Zhuguang area,suggesting the uranium mineralization has closely genetic relationship with Late Cretaceous-Paleocene crust extension in Nanling region. The mantle-source mineralizer CO_2 for uranium mineralization were possibly derived from the extension of regional NE-trending fault zones. Combined with previous data,the uranium mineralization in Zhuguang area is characterized by simultaneity and multiple stages( ～ 140 Ma, ～ 125 Ma, ～ 105 Ma, ～ 90 Ma and 80 ～ 60 Ma),and occurred at the Cretaceous-Paleogene lithospheric extensional dynamic setting of South China. The Cretaceous-Paleogene tectonic evolution of basin-range,within the Zhuguangshan complex and Nanxiong basin,was possibly responsible for the genesis of uranium mineralization in Zhuguang area.
Granite-type uranium deposit is an important industrial type of uranium deposit in China,which is widespread in the Nanling region. The Changjiang uranium ore field,which located at central-south of Zhuguangshan complex in Nanling region,is one of representative granite-type uranium ore fields of South China. Because of the nature of mineral chemical composition and origin of uranium minerals,the ore-forming ages( 157 ～ 52 Ma) obtained by conventional U-Pb isotopic dating in previous literature showed a wide range and failed to reveal the ore-forming ages for Changjiang uranium ore field. In this paper,we carry out detailed investigations upon updated mineralogy and in-situ U-Pb geochronology of uraninite. U-Pb ages of uraninite in six typical uranium ore samples stretch across a narrow number range( Mianhuakeng deposit of 60. 8 ± 0. 6 Ma and 66. 8 ± 1. 6 Ma,Shulouqiu deposit of 71. 4 ± 1. 3 Ma and74. 4 ± 1. 7 Ma,Changpai deposit of 62. 4 ± 2. 5 Ma and 70. 2 ± 0. 5 Ma),suggesting the main uranium mineralization likely occurred at three stages of ～ 75 Ma, ～ 70 Ma and ～ 60 Ma. These new in-situ U-Pb ages of uraninite,which represent the late uranium mineralization of granite-type uranium deposit in South China,are synchronous with the extension period( 80 ～ 60 Ma) of NE-trending fault subsidence zones and fault basins in Zhuguang area,suggesting the uranium mineralization has closely genetic relationship with Late Cretaceous-Paleocene crust extension in Nanling region. The mantle-source mineralizer CO_2 for uranium mineralization were possibly derived from the extension of regional NE-trending fault zones. Combined with previous data,the uranium mineralization in Zhuguang area is characterized by simultaneity and multiple stages( ～ 140 Ma, ～ 125 Ma, ～ 105 Ma, ～ 90 Ma and 80 ～ 60 Ma),and occurred at the Cretaceous-Paleogene lithospheric extensional dynamic setting of South China. The Cretaceous-Paleogene tectonic evolution of basin-range,within the Zhuguangshan complex and Nanxiong basin,was possibly responsible for the genesis of uranium mineralization in Zhuguang area.
引文
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