摘要
本文讨论了加拿大帕莉莱(Prairie Flats)矿床现代表生铀成矿作用特点,认为表生环境下,砂、砾沉积体中基本不存在铀的富集,而富集于细碎屑沉积物中的铀是不稳定的,在压实成岩过程中,解吸铀及部分吸附铀会逐渐迁移到附近的砂岩(体)内,对砂岩铀成矿起着重要的控制作用。根据帕莉莱矿床现代表生铀成矿作用特点,提出半干旱或干湿型古气候环境下形成的杂色建造可发生铀的沉积成岩预富集,并是砂岩铀矿的重要含矿建造之一。
Characteristics of recent surficial uranium metallogeny of Prairie Flats deposit in Canada are discussed in the paper. Under supergene condition, uranium enrichment mainly occurs in sediments composed of fine-grained elastics instead of sand and pebble. However, the uranium in fine-grained clastic sediments is unstable, most of the uranium in adsorption state in fine elastics will be desorbed and migrated to the nearby sandstone bodies during the process of sediment compaction. According to the characteristics of recent surficial uranium metallogeny of Prairie Flats deposit, it is proposed that uranium pre-enrichment during depositional-diagenetic stage can be developed in the variegated formation formed under semi-arid or arid-humid climatic conditions, and can become an important ore-hosting formation for sandstone-type uranium deposits.
出处
《世界核地质科学》
CAS
2004年第1期9-14,共6页
World Nuclear Geoscience
基金
由核工业地质局"中国北西部铀成矿区划"专项地质调查研究项目资助。
关键词
铀矿
成矿作用
找矿
古气候
表生作用
成岩作用
supergenesis
diagenesis
paleoclimate
sandstone-type uranium deposit
