湘西南地区成岩型铀矿成矿机制研究
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摘要
成岩型铀矿床,在国外被称为"页岩铀",是一种被认为有可能改变当今世界铀矿格局的铀矿类型,是由沉积作用在沉积成岩过程中直接形成的矿床。湘西南地区是我国成岩型铀矿唯一的集中分布区。通过对成岩、成矿的研究,初步认为湘西南地区成岩型铀矿是在伸展构造环境条件下,中基性岩浆活动产生的多期的、间歇性海底喷流将地壳深部的铀等成矿物质带到沉积海盆,在粘土吸附作用下形成的矿床,海底热水喷流成矿作用是主要成因。
The diagenetic uranium deposit, known as "shale uranium" abroad, is a type of uranium mine considered to be possible to change the current pattern of uranium deposits in the world,formed directly by deposition in the process of sedimentary diagenesis. The southwestern Hunan is the only concentrated distribution area in China's diagenetic uranium deposits. Study on diagenesis and metallogenesis shows that the frequent and spasmodic submarine cascade that were produced by the intermediate and basic magmatic activity took uranium and orther minerals to the depositional marine basin from deep earth crust and formed mine bed under the adsorption action of clay in the situation of extend structural environment. The diagenetic uranium deposit is of submarine exhalative origin.
The diagenetic uranium deposit, known as "shale uranium" abroad, is a type of uranium mine considered to be possible to change the current pattern of uranium deposits in the world,formed directly by deposition in the process of sedimentary diagenesis. The southwestern Hunan is the only concentrated distribution area in China's diagenetic uranium deposits. Study on diagenesis and metallogenesis shows that the frequent and spasmodic submarine cascade that were produced by the intermediate and basic magmatic activity took uranium and orther minerals to the depositional marine basin from deep earth crust and formed mine bed under the adsorption action of clay in the situation of extend structural environment. The diagenetic uranium deposit is of submarine exhalative origin.
引文
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[2]Taylor,S.R.,Mc Lennan,S.M.,1985.The continental crust:its composition and evolution Blachehwell,Oxford,312.
[3]胡瑞忠.火成岩成矿物质来源及其对形成含铀热液的制约[A].全国矿床地质矿床地球化学理论与方法学术讨论会文集[C].。兰州:兰州大学出版社.1990.
[4]张待时.中国碳硅泥岩型铀矿床成矿规律探讨[J].铀矿地质,1994,10(4):207-212.
[5]刘建明,叶杰,刘家军,等.论我国微细浸染型金矿床与盆地演化的关系—以右江盆地为例[J].矿床地质,2001,20(4):367-377.
[6]刘兴忠,冯明月,罗长本,等.中国铀矿找矿指南[M].中国核工业地质局.1997.
[7]张成江,陈友良.510-1铀矿床垂直分带规律的发现及其成因意义[J].地质与勘探,2010,46(3):434-441.