林锐华,杨秀峰,刘行,王亚飞,朱斌,韩建栢,孙志明,王继远.北秦岭东段柳树湾花岗伟晶岩型铀矿床铅同位素特征与成矿作用探讨[J].地质找矿论丛,2021,36(1):48-55
北秦岭东段柳树湾花岗伟晶岩型铀矿床铅同位素特征与成矿作用探讨
Pb isotope characteristics of Liushuwan granitic pegmatite type U deposit in the eastern part of The North Qinling orogenic belt and its implications for metallogenesis
投稿时间:2020-08-18  
DOI:10.6053/j.issn.1001-1412.2021.01.006
中文关键词:  柳树湾  花岗伟晶岩  铅同位素特征  成矿作用  北秦岭  豫西南地区
英文关键词:Liushuwan  granite pegmatite  Pb isotopic characteristics  metallogenesis  North Qinling orogenic belt  western part of Henan province
基金项目:中国地质调查局地质矿产调查项目(编号:DD20160129-2、1212011120771)资助。
作者单位E-mail
林锐华 中钢集团天津地质研究院有限公司, 天津 300181  
杨秀峰 中钢集团天津地质研究院有限公司, 天津 300181  
刘行 中国地质调查局天津地质调查中心, 天津 300170 liuxing_tcgs@163.com 
王亚飞 中钢集团天津地质研究院有限公司, 天津 300181  
朱斌 中钢集团天津地质研究院有限公司, 天津 300181  
韩建栢 中钢集团天津地质研究院有限公司, 天津 300181  
孙志明 中钢集团天津地质研究院有限公司, 天津 300181  
王继远 中钢集团天津地质研究院有限公司, 天津 300181  
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中文摘要:
      柳树湾花岗伟晶岩型铀矿床地处华北克拉通南缘,南接南秦岭构造带,位于北秦岭东段的灰池子岩体东段北侧。本文对柳树湾花岗伟晶岩型铀矿床中含铀花岗伟晶岩脉、接触带附近黑云斜长片麻岩和黑云母二长花岗岩所含黄铁矿开展了铅同位素对比研究。结果表明,黑云母二长花岗岩黄铁矿铅μ值为9.50~9.58,区别于正常铅μ值,而介于地幔μ值与造山带μ值之间,应是下地壳铅与造山带铅(即峡河岩群地层铅)的混源。花岗伟晶岩脉的数量和产铀能力与距离岩体的远近有直接关系,当距离岩体较近时,则具有数量增多、产铀能力增强的特点,铀工业矿体(或含铀矿化体)主要赋存在岩体与黑云斜长片麻岩地层的内外接触带有限距离范围内的花岗岩伟晶岩脉中。柳树湾地区黑云母二长花岗岩黄铁矿铅同位素组成具有混源铅特征,是对区内钾长石化、黑云母化和石英硅化等成矿蚀变的响应。
英文摘要:
      The Liushuwan granitic pegmatite type U deposit is located in the north side of the eastern Huichizi granite body neighbouring the south margin of the North China Craton to the north of and the South Qinling tectonic belt to the south of the east section of the North Qinling orogenic belt. In this paper, Pb isotopic studies have been carried out on pyrites in the biotite adamellites and biotite-plagioclase gneisses. The results showed that the μ values of pyrites in biotite adamellites are 9.50~9.58, different from the normal Pb value and between those of the mantle and the orogenic belt thus should be the mixed source value of Pb from the lower crust and the orogenic belt (the Xiaheyan Group). The closer to the Huichizi granite body the more granitic pegmatitic dykes occur and the stronger the U mineralization of the veins is. The U ore bodies (or the U mineralization bodies) mainly occur in the granitic pegmatite dykes at limited distance to the outer and inner contact zones of the rock body and the biotite plagioclase gneisses. The Pb isotopic composition of pyrites in the biotite adamellites is characteristic of mixed source Pb.
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