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李研,聂逢君,严兆彬. 松辽盆地东北部铀矿含矿目的层泉头组物质来源及其构造背景分析-来自岩石学和地球化学的证据[J]. 科学技术与工程, 2020, 20(30): 12324-12331.
李研,Nie Fengjun,Yan Zhaobin.Source and tectonic background analysis of the quantou formation in the northeastern songliao basin - evidence from petrology and geochemistry[J].Science Technology and Engineering,2020,20(30):12324-12331.
松辽盆地东北部铀矿含矿目的层泉头组物质来源及其构造背景分析-来自岩石学和地球化学的证据
Source and tectonic background analysis of the quantou formation in the northeastern songliao basin - evidence from petrology and geochemistry
投稿时间:2020-02-12  修订日期:2020-08-04
DOI:
中文关键词:  泉头组  岩石学 地球化学  松辽盆地东北部
英文关键词:Quantou  formation petrology  geochemistry Northeast  of Songliao  Basin
基金项目:中国核工业地质局“松辽盆地北部砂岩型铀矿资源调查评价”项目编号(201709)
        
作者单位
李研 东华理工大学
聂逢君 东华理工大学
严兆彬 东华理工大学
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中文摘要:
      对于松辽盆地东北部地浸砂岩型铀矿找矿工作而言,赋铀砂体的物源是其关键,泉头组是重要的含矿目的层之一,明确其岩石学和地球化学特征,对于松辽盆地北部找矿具有十分重要的意义,本文通过对松辽盆地东北部10件砂岩样品进行岩石学研究、稀土元素、微量元素的分析测试工作,可知泉头组碎屑岩主要以长石岩屑砂岩为主,其碎屑岩成分成熟度和结构成熟度均较低,具有近物源沉积的特征,岩石稀土总量不高(ΣREE=84.85×10?6~140.12×10?6),轻稀土分馏系数(La/Sm)N=3.57~4.12,重稀土分馏系数(Gd/Yb)N=2.13~2.67,Eu为中等负异常(δEu=0.57~0.96),微量元素以富集LREE、Rb、Th、U、K,强烈亏损Sr、P、Ti为特征,具有壳源特征,且在源区和构造判别图解上分别落入长英质源区及活动大陆边缘区域内,显示泉头组母岩的沉积环境是与活动大陆边缘相关的沉积盆地。
英文摘要:
      Abstract:For the northeast songliao basin sandstone type uranium deposit prospecting work,The provenance of uranium - bearing sand body is its key factor, Quantou formation is one of the important purpose of ore layer, identify the petrological and geochemical characteristics of the prospecting in northern songliao basin is of great significance, Through the petrology studytrace elements and rare earth elements of the Quantou formation in this study area ,its known that quantou formation clastic rocks are mainly composed of feldspathic lithic sandstone, the clastic rock compositional maturity and textural maturity are low, with nearly the sedimentary characteristics of the source,which are characterized by relatived poor total REE contents(ΣREE=103.80×10?6~194.31×10?6), significant fractionation of HREE and REE[(La /Yb)]N =3.57~4.12 and moderate Eu negative anomalies(δEu=0.57~0.96)The rhyolites are enriched Rb,Th, U, K and LREE, and strong loss of Ba, Sr and HFSE (e.g., Nb, Ta, P and Ti), relative loss of Nb, Ta.Moreover, it falls into the source area and the active continental margin area respectively in the source area and the structural discriminant diagram, indicating that the sedimentary environment of the mother rocks of the quantou formation is a sedimentary basin related to the active continental margin.
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