锆石铀含量与岩体成矿能力相关性研究——以诸广南部花岗岩为例
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摘要
为初步探讨锆石铀含量在花岗岩型铀矿远景区预测方面的应用前景,以勘探研究程度较高的诸广南部花岗岩为样本,经花岗岩类样品概率统计显示产铀岩体锆石平均铀含量略大于贫铀岩体,总体差别不明显;样品分期次、岩性对比分析表明产铀岩体锆石平均铀含量也并非普遍高于贫铀岩体,印支期产铀岩体二云母花岗岩锆石平均铀含量甚至低于贫铀岩体;统计发现产铀岩体花岗岩岩脉中具有超高的锆石铀含量(平均铀含量3 000×10-6以上)。初步分析认为依据花岗岩类锆石铀含量暂不能有效判别诸广山复式岩体成矿能力;岩脉锆石铀含量超高可能是铀矿找矿的重要标志,因而具超高锆石铀含量的花岗岩岩脉是否发育可能是该区域寻找工业铀矿床的关键。
The highly explored and studied southern Zhuguang granitic composite was used as the case for preliminary study on the application prospect of zircon uranium content in the exploration of granite uranium deposit. For this purpose, 21 samples of 3 types lithology from 10 U-deposit hosting pluton, 3 U-barren pluton was collected for the measurement of uranium content in zircons. Statistics of average uranium content in zircons showed that U-deposit bearing plutons have slightly higher zircons uranium content than that in U-barren pluton and there is no obvious difference of zircons uranium content between the deposit bearing and deposit barren pluton. The samples from different period and lithology in the deposit bearing pluton showed no higher average zircon uranium content than that in deposit barren plutons, the deposit bearing two-mica granite pluton of Indo-Chinese period even has less content than that in deposit barren granitic pluton of the same period. Meanwhile, the granite dikes in deposit bearing pluton have ultrahigh zircon uranium content( the average uranium content in zircons was more than 3 000 ×10-6). Therefore, the uranium content in zircons could not be used to evaluate the deposit bearing capacity in Zhuguang granitic composite, the high zircons uranium content in granite dike maybe the result of metallization and can be used as the sign for the indication of uranium deposits in this area.
The highly explored and studied southern Zhuguang granitic composite was used as the case for preliminary study on the application prospect of zircon uranium content in the exploration of granite uranium deposit. For this purpose, 21 samples of 3 types lithology from 10 U-deposit hosting pluton, 3 U-barren pluton was collected for the measurement of uranium content in zircons. Statistics of average uranium content in zircons showed that U-deposit bearing plutons have slightly higher zircons uranium content than that in U-barren pluton and there is no obvious difference of zircons uranium content between the deposit bearing and deposit barren pluton. The samples from different period and lithology in the deposit bearing pluton showed no higher average zircon uranium content than that in deposit barren plutons, the deposit bearing two-mica granite pluton of Indo-Chinese period even has less content than that in deposit barren granitic pluton of the same period. Meanwhile, the granite dikes in deposit bearing pluton have ultrahigh zircon uranium content( the average uranium content in zircons was more than 3 000 ×10-6). Therefore, the uranium content in zircons could not be used to evaluate the deposit bearing capacity in Zhuguang granitic composite, the high zircons uranium content in granite dike maybe the result of metallization and can be used as the sign for the indication of uranium deposits in this area.
引文
[1]郑懋公,朱杰辰.我国中酸性岩浆岩锆石铀含量变化及其地质意义[J].放射性地质,1984,(3):17-23.
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[7]Zhang L,Chen Z Y,Li X F,et al.Zircon U-Pb geochronology and geochemistry of granites in the Zhuguangshan complex,South China:Implications for uranium mineralization[J].Lithos,2018,308-309:19-33.
[8]夏宗强,王丙华,谢小占,等.粤北花岗岩型铀矿成矿地质体的初步厘定及其找矿意义[J].东华理工大学学报,2016,39(2):132-138.
[9]冯明月,何德宝.华南产铀花岗岩和产铀花岗岩特征[J].铀矿地质,2012,28(4):199-207.
[10]Christophe B,Liu X D,Julien M,et al.The genesis of granite-related hydrothermal uranium deposits in the Xiazhuang and Zhuguang ore fields,North Guangdong Province,SE China:Insights from mineralogical,trace elements and U-Pb isotopes signatures of the U mineralization[J].Ore Geology Review,2018,92:588-612.
[11]Zhang L,Chen Z Y,Li S G,et al.Isotope geochronology,geochemistry,and mineral chemistry of the U bearing and barren granites from the Zhuguangshan complex,South China:Implications for petrogenesis and uranium mineralization[J].Ore Geology Review,2017,91:1 040-1 065.
[12]黄国龙,刘鑫扬,孙立强,等.粤北长江岩体的锆石U-Pb定年、地球化学特征及其成因研究[J].地质学报,2014,88(5):836-849.
[13]黄国龙,曹豪杰,凌洪飞,等.粤北油洞岩体SHRIMP锆石U-Pb年龄、地球化学特征及其成因研究[J].地质学报,2012,86(4):577-586.
[14]徐文雄,谭忠银,罗春梧,等.棉花坑铀矿床花岗质脉岩地球化学特征及其与铀成矿的关系[J].铀矿地质,2014,30(6):345-355.
[15]虞航,蔡煜琦,李伟林,等.诸广山南部高坪地区细粒花岗岩LA-ICP-MS锆石U-Pb年龄及其地质意[J].地质论评,2017,63(3):781-792.
[16]朱捌,邓平,凌洪飞,等.粤北红山岩体形成时代及成因研究[J].铀矿地质,2009,25(6):321-329.
[17]兰鸿锋,凌洪飞,孙立强,等.诸广山南体桃金洞花岗岩成因和铀成矿潜力探讨[J].高校地质学报,2016,22(1):12-29.
[18]杜乐天.全球热液铀矿地球化学---对当代国际热液铀矿理论的重建[M].北京:地质出版社,2015:1-143.
[2]李耀菘,朱杰辰,夏毓亮.锆石特征及铀含量在铀成矿远景评价中的意义[J].中国核科技报告,1995,(S2):1-14.
[3]陈振宇,王登红.锆石Th、U含量和Th/U比值对产铀、不产铀花岗岩体的判别意义[J].矿床地质,2014,33(增刊):1159-1160.
[4]邓平,任纪舜,凌洪飞,等.诸广山南体燕山期花岗岩的锆石SHRIMP U-Pb年龄及其构造意义[J].地质论评,2011,57(6):881-888.
[5]邓平,任纪舜,凌洪飞,等.诸广山南体印支期花岗岩的SHRIMP锆石U-Pb年龄及其构造意义[J].科学通报,2012,57(14):1231-1241.
[6]吕立娜,代凤红,李莉,等.华南诸广山岩体铀成矿条件及成矿潜力分析[J].中国煤炭地质,2017,29(12):36-40.
[7]Zhang L,Chen Z Y,Li X F,et al.Zircon U-Pb geochronology and geochemistry of granites in the Zhuguangshan complex,South China:Implications for uranium mineralization[J].Lithos,2018,308-309:19-33.
[8]夏宗强,王丙华,谢小占,等.粤北花岗岩型铀矿成矿地质体的初步厘定及其找矿意义[J].东华理工大学学报,2016,39(2):132-138.
[9]冯明月,何德宝.华南产铀花岗岩和产铀花岗岩特征[J].铀矿地质,2012,28(4):199-207.
[10]Christophe B,Liu X D,Julien M,et al.The genesis of granite-related hydrothermal uranium deposits in the Xiazhuang and Zhuguang ore fields,North Guangdong Province,SE China:Insights from mineralogical,trace elements and U-Pb isotopes signatures of the U mineralization[J].Ore Geology Review,2018,92:588-612.
[11]Zhang L,Chen Z Y,Li S G,et al.Isotope geochronology,geochemistry,and mineral chemistry of the U bearing and barren granites from the Zhuguangshan complex,South China:Implications for petrogenesis and uranium mineralization[J].Ore Geology Review,2017,91:1 040-1 065.
[12]黄国龙,刘鑫扬,孙立强,等.粤北长江岩体的锆石U-Pb定年、地球化学特征及其成因研究[J].地质学报,2014,88(5):836-849.
[13]黄国龙,曹豪杰,凌洪飞,等.粤北油洞岩体SHRIMP锆石U-Pb年龄、地球化学特征及其成因研究[J].地质学报,2012,86(4):577-586.
[14]徐文雄,谭忠银,罗春梧,等.棉花坑铀矿床花岗质脉岩地球化学特征及其与铀成矿的关系[J].铀矿地质,2014,30(6):345-355.
[15]虞航,蔡煜琦,李伟林,等.诸广山南部高坪地区细粒花岗岩LA-ICP-MS锆石U-Pb年龄及其地质意[J].地质论评,2017,63(3):781-792.
[16]朱捌,邓平,凌洪飞,等.粤北红山岩体形成时代及成因研究[J].铀矿地质,2009,25(6):321-329.
[17]兰鸿锋,凌洪飞,孙立强,等.诸广山南体桃金洞花岗岩成因和铀成矿潜力探讨[J].高校地质学报,2016,22(1):12-29.
[18]杜乐天.全球热液铀矿地球化学---对当代国际热液铀矿理论的重建[M].北京:地质出版社,2015:1-143.