摘要
利用U-Pb同位素组成演化对海拉尔盆地西部西胡里吐盆地蚀源区火山岩类和克鲁伦凹陷蚀源区花岗岩类岩石的研究表明:蚀源区岩石原始铀含量(U0)较高,火山岩类平均U0为10.061×106,铀变化系数(ΔU)平均为49.57%;花岗岩类平均U0为18.381×106,ΔU平均为80%。这些结果显示了蚀源区岩石能为沉积砂体提供预富集的物质基础,也能提供成矿铀源。岩石的U-Ra平衡系数研究表明,火山岩类存在明显的U-Ra不平衡现象,而花岗岩提供成矿铀源应发生在16000a以前。
Using U-Pb isotope composition evolution, this paper expounds the initial uranium content m volcanic rocks of provenance area of Xihulitu basin and in granites of provenance area of Kelulun sag, western Hailaer basin. The initial uranium content （U0） in volcanic rocks of provenance area is higher, the average initial uranium content of volcanic rocks is 10. 061 X 10-~ , the average uranium variation coefficient （AU） is 49.57~ ~ the average initial uranium content of granites is 18. 381 X 10-6 , the average uranium variation coefficient （/＇,U） is -80~. The results indicate that rocks in provenance area could provide the pre enrichment of uranium in deposited sandstone. U-Ra equilibrium coefficients of rocks indicate that there is obvious U-Ra disequilibrium phenomenon in volcanic rocks, and the time when granites provided uranium source occurred 16000 a ago.
出处
《铀矿地质》
CAS
CSCD
2006年第2期99-103,共5页
Uranium Geology
关键词
海拉尔盆地
蚀源区岩石
U-PB同位素
成矿铀源
Hailaer basin
rocks of provenance area
U-Pb isotopes
uranium source for ore-formation
