陕西省华阳川铀多金属矿床铀-铌-稀土矿化特征研究
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摘要
陕西省华阳川铀多金属矿床位于华北板块南缘小秦岭地区,受控于小夫峪─华阳川─黄龙铺NW向深断裂带。矿床主要地质体由老到新分别为太华群变质岩、石英正长岩、花岗伟晶岩、碳酸岩,均为U-Nb-REE矿化的围岩。成矿期典型的矿物组合为闪石、磷灰石、独居石、铌钛铀矿及褐帘石,不同围岩中有不同的产出特征,具有明显的阶段性。详细的野外和室内镜下研究表明, UNb-REE成矿期矿物形成可分为5个阶段:碱性硅酸盐阶段、磷酸盐阶段、富含Ti矿物阶段、富含U-Nb-Ti氧化物阶段、富含LREE-Al-Ca矿物阶段。成矿期矿物形成过程的建立有助于探讨矿床成因。
Huayangchuan polymetallic deposit is located in Xiao Qinling rang of southern margin of the North China block, controlled by Xiaofuyu-Huayangchuan-Huanglongpu northwest-trending deep fault. The main geological bodies of this deposit are Taihua Group metamorphic rocks, quartz syentite,granite pegmatite, carbonatite, which are the main country rocks of REE-U-Nb mineralization. The typical mineral occurrence of mineralization stage is pyroxene, amphibole, monazite, apatite,betafite and allanite, different country rocks have different occurrence characteristics, the mineralization is with obvious stages. Based on geological field survey and microscopic study, U-NbREE mineralization can be divided into five stages: alkaline silicate stage, phosphate stage, Ti-rich minerals forming stage, U-Nb-Ti-rich oxide stage, LREE-Al-Ca-rich stage. The establishment of U-Nb-REE minerals stages can help us understand the deposit genesis.
Huayangchuan polymetallic deposit is located in Xiao Qinling rang of southern margin of the North China block, controlled by Xiaofuyu-Huayangchuan-Huanglongpu northwest-trending deep fault. The main geological bodies of this deposit are Taihua Group metamorphic rocks, quartz syentite,granite pegmatite, carbonatite, which are the main country rocks of REE-U-Nb mineralization. The typical mineral occurrence of mineralization stage is pyroxene, amphibole, monazite, apatite,betafite and allanite, different country rocks have different occurrence characteristics, the mineralization is with obvious stages. Based on geological field survey and microscopic study, U-NbREE mineralization can be divided into five stages: alkaline silicate stage, phosphate stage, Ti-rich minerals forming stage, U-Nb-Ti-rich oxide stage, LREE-Al-Ca-rich stage. The establishment of U-Nb-REE minerals stages can help us understand the deposit genesis.
引文
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[2]惠小朝.陕西省华阳川铀多金属成矿作用地球化学研究[D].北京:核工业北京地质研究院,2014.
[3]何升,李子颖,惠小朝,等.陕西华阳川铀多金属矿床黑云母40Ar-39Ar年龄及其地质意义[J].铀矿地质,2016,32(3):159-164.
[4]惠小朝,何升.华阳川铀多金属矿床碳酸岩脉矿化特征[J].铀矿地质,2016,32(2):93-98.
[5]惠小朝,李子颖,冯张生,等.陕西华阳川铀多金属矿床铀赋存状态研究[J].矿物学报,2014,34(4):573-580.
[6]惠小朝,李子颖,黄志章,等.陕西省华阳川铀多金属矿床成矿特征[J].矿床地质,2012(S1):201-202.
[7]喻学惠.陕西华阳川碳酸岩地质学和岩石学特征及其成因初探[J].地球科学,1992,17(2):151-158,244.
[8]XU C,CAMPBELLI H,ALLENC M,et al.Flat rare earth element patterns as an indicator of cumulate processes in the Lesser Qinling carbonatites,China[J].Lithos,2007,95(3-4):267-278.
[9]XU C,TAYLOR R N,KYNICKY J,et al.The origin of enriched mantle beneath North China block:Evidence from young carbonatites[J].Lithos,2011,127(1-2):1-9.
[10]Reguir E P,Chakhmouradian A R,Halden N M,et al.Early magmatic and reaction-induced trends in magnetite from the carbonatites of Kerimasi,Tanzania[J].Canadian Mineralogist,2008,46(4):879-900.