席志轩,王辰,卞驾华,冀翔,冯伟.山东省塔埠头地区花岗伟晶岩稀土矿成矿时代特征及地球化学特征[J].西北地质,2020,53(3):10-40 XI Zhixuan,WANG Chen,BIAN Jiahua,JI Xiang,FENG Wei.Metallogenic Epoch Characteristics and Geochemical Features of Granitic Pegmatite Rare Earth Ore in Tabutou Area, Shandong Province[J].Northwestern Geology,2020,53(3):10-40
山东省塔埠头地区花岗伟晶岩稀土矿成矿时代特征及地球化学特征
Metallogenic Epoch Characteristics and Geochemical Features of Granitic Pegmatite Rare Earth Ore in Tabutou Area, Shandong Province
投稿时间:2019-09-30  修订日期:2020-06-02
DOI:10.19751/j.cnki.61-1149/p.2020.03.002
中文关键词:  塔埠头;Th-Pb测年;花岗岩;花岗伟晶岩
英文关键词:Tabutou;Th-Pb dating;granite;granitic pegmatite
基金项目:山东省地质四院“山东省三稀矿产资源研究项目”(213027160439)
作者单位
席志轩 西北有色勘测工程公司, 陕西 西安 710054 
王辰 陕西省自然资源厅, 陕西 西安 710082 
卞驾华 河南省航空物探遥感中心, 河南 郑州 450000 
冀翔 焦作市地震台, 河南 焦作 454000 
冯伟 西北公路研究院, 陕西 西安 710025 
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中文摘要:
      笔者在野外调查和花岗伟晶岩带划分的基础上,通过对塔埠头稀土矿床岩相学、同位素年代学及地球化学的分析研究,确定了成岩、成矿年龄,探讨了成矿物质来源及花岗伟晶岩与稀土成矿的联系,建立了该矿床成因模式。元素地球化学特征显示,含稀土的花岗伟晶岩具有低硅、低碱、富铁过铝质特征,钾长-斜长花岗伟晶岩、钾长花岗伟晶岩和钾长花岗岩3类花岗伟晶岩均具有高硅高碱低铁过铝质的特征,轻重稀土元素分异较明显,亏损Ta、Ti、Nb、P等高场强元素,富集K、Rb等大离子亲石元素。LA ICP-MS同位素测年结果表明,含稀土花岗伟晶岩氟碳铈矿Th-Pb测年结果为(128.5±2.0)Ma、(134.4±1.2)Ma,指示稀土成矿发生在中生代白垩纪。
英文摘要:
      Based on the field investigation and the division of pegmatite belts, through the analysis of petrography, isotope chronology, and geochemistry, the authors determined the diagenetic and metallogenic age and discussed the source of ore-forming material and the relationship between pegmatite and rare earth ore to establish a metallogenetic model of the deposit.The geochemical characteristics show that the rare earth-bearing pegmatite is low silicon, low alkali and iron peraluminous-rich. potassium chang-plagioclase granite pegmatite, potash feldspathic granite pegmatite and potash feldspar granite all have the characteristics of high silicon and alkali and low iron peraluminous. There is a clear differentiation of light and heavy rare earth element, a loss of high field-strength elements such as Ta, Ti, Nb and P, and an enrichment of large ion lithophiles elements as K and Rb. The LA ICP-MS isotope dating shows that the Th-Pb dating of the bastnasite was(128.5±2.0) Ma and (134.4±1.2) Ma, indicating that the mineralization of rare earth occurred in Mesozoic Cretaceous.
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