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江西相山铀矿田基性岩特征及意义研究
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摘要
相山铀矿田地处江西乐安、崇仁两县交界处的,是我国业已发现的最大火山岩型铀矿田,为我国主要铀矿资源基地之一。相山铀矿田的地质工作前人开展较为全面,但对于基性岩的研究基本为空白。本文通过对相山地区基性岩的野外地质调研和室内进行岩相学和地球化学特征等的详细研究,取得了以下认识和成果。
     (1)通过对基性岩岩石学和矿物学等的研究,发现相山地区基性岩有两种类型:矿田内部为煌斑岩,外围基底为辉绿岩。
     (2)煌斑岩的SiO2含量为42.20%~54.20%,里特曼指数(σ)为1.38~8.21,属于钙碱性~碱性岩系;微量元素和稀土元素总体上显示出较为一致的配分模式,为轻稀土富集右倾型的配分模式。辉绿岩的SiO2含量为50.20%~55.41%,里特曼指数(σ)为2.99~4.28,表明辉绿岩样品属于钙碱性系列;微量元素和稀土元素总体上显示出较为一致的配分模式,均显示为轻稀土富集右倾型的配分模式。
     (3)煌斑岩和辉绿岩~(87)Sr/~(86)Sr、~(143)Nd/~(144)Nd比值在下部地壳和中国东部地幔之间,表明相山地区煌斑岩和辉绿岩岩浆来自地幔,并受到地壳物质的混染。在铅构造模式图上,煌斑岩和辉绿岩~(207)Pb/~(204)Pb和~(206)Pb/~(204)Pb比值数据点均在地幔和造山带演化线之间,同样也表明基性岩的岩浆源一致,均来自于地幔,并受到地壳物质的混染。
     (4)通过K-Ar同位素年龄测定,相山矿田内煌斑岩有三期侵入作用,分别是第一期134Ma、第二期120~125Ma、第三期为84.5Ma;相山外围基底变质岩中辉绿岩有两期侵入作用,其中北部为149Ma,南部为193Ma。
     (5)认为古太平洋板块俯冲产生的拉张作用以及拉张作用造成的构造带重新活化对相山地区基性岩脉的形成有重要影响。
     (6)相山地区基性岩岩浆作用与铀成矿作用明显,相山铀成矿作用具深源成矿特征。
Xiangshan uranium ore-field deposit is located at Le’an county and Chongren countyintersection of Jiangxi Province, which is the largest volcanic type uranium deposit in thatfield of our country, and as one of the main base of uranium resources. Xiangshan uraniumore-field geological work of our predecessors to carry out a more comprehensive,The basicblank but for the study of mafic rocks. In this paper, Through the geological research onXiangshan mafic rocks in the field and Detailogy, etc. Found that the mafi-c at Xiangshanarea had two types: the internal of the ore field is the lamprophyre, the external substrate isthe diabase. ed study of the petrographic and geochemical characteristics indoor. Made thefollowing knowledge and results.
     (1)Through Research on the Mafic petrology and Mineral
     (2) The lamprophyre of the SiO2content are42.20%to54.20%,Rittmann index (σ)from1.38to8.21, Belong to the calc-alkaline to alkaline rock series; Trace elements andrare earths in general show a more consistent distribution patterns, are LREE enrichmentrightist-distribution patterns. The diabases of the SiO2content from50.20%to55.41%,Rittmann index (σ) are2.99~4.28, shows that the diabase samples belong to the calcal-kaline series; Trace elements and rare earths in general show a more consistent distrib utio-n patterns, Have shown that right wing type distribution patterns of LREE enrichment.
     (3) The87Sr/86Sr ratios and143Nd/144Nd ratios of the lamprophyre and diabasebetween the lower crust in the mantle to the mantle of eastern China mantle. Showed thatthe Xiangshan region of the lamprophyre and diabase magma source from the mantle,andcontaminated by crustal material. At the diagram of leadoftectonic model, the(207Pb/204Pband206Pb/204Pb)ratios of the data points of the lamprophyre and diabase all locatedbetween the lines of mantle and orogenic evolution, Also show that Mafic rocks andMagma source Consistent From the mantle, and contaminated by crustal material.
     (4)Through the K-Ar isotopic age determinations,There are three the role oflamprophyre invasive in Xiangshan ore field, Respectively: The first phase of134Ma, thesecond phase of120~125Ma, and the third of84.5Ma; There are two invasive role ofdiabase effect in the basement metamorphic rocks of the Xiangshan Periphery, Which thenorthern is149Ma, and the Southern is193Ma.
     (5)Consider that the tensional role of Pacific plate subduction and pull effect causedby constructed with re-activation is important influence on the formation at the Xiangshanmafic dikes.
     (6) It’s clear that Xiangshan mafic magmatism and uranium mineralizationobviously, and Xiangshan Uranium Mineralization has the characteristics of deepmineralization.
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