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白云鄂博铁-稀土矿床是世界上著名的超大型稀土矿,其独特的矿物组合、复杂的成因和稀土元素的大规模富集引起国内外学者的广泛兴趣,并进行了多方面的深入研究。至今对矿床成因、成矿时代和物质来源等问题,还有分歧。如何准确测定它的形成年龄仍是地质年代学家们尚未彻底解决的问题。本文报道从白云鄂博主矿矿石中分选出的锆石和磷灰石,采用径迹退火温度截然不同的锆石>600℃和磷灰石<200℃的矿物对,进行裂变径迹年龄研究,分析同一矿石中两种不同单矿物产生的裂变径迹与记录的条件,由此研究测定所得值应是可信的。
The Bayan Obo-Rare Earth Deposit is a world-renowned ultra-large rare earth mine. Its unique mineral assemblage, complex causes and large-scale enrichment of rare earth elements have aroused widespread interest of scholars at home and abroad and conducted in-depth research in many aspects. Up till now, there are still differences on the genesis of the deposit, the time of mineralization and the source of the material. How to accurately determine its age of formation is still a problem that geochronologists have not yet completely solved. In this paper, zircon and apatite were isolated from the main ore of Bayan Obo. The fission track age was studied by using mineral pairs with zircons> 600 ℃ and apatite <200 ℃ with different track annealing temperatures. Analysis of fission tracks and recording conditions produced by two different single minerals in the same ore, from which the value obtained from the study, should be credible.