| 内蒙古曹四夭钼矿花岗斑岩地质地球化学特征及U-Pb同位素测年 |
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| 引用本文： | 李香资,权知心,付恒一,安婧雯,杨位坤. 内蒙古曹四夭钼矿花岗斑岩地质地球化学特征及U-Pb同位素测年[J]. 地质找矿论丛, 2016, 31(3): 325-333. DOI: 10.6053/j.issn.1001-1412.2016.03.002 |
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| 作者姓名： | 李香资 权知心 付恒一 安婧雯 杨位坤 |
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| 作者单位： | 河南省地质矿产勘查开发局第二地质勘查院,郑州,450000 |
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| 摘 要： | 内蒙古兴和县曹四夭超大型钼矿床的成矿岩体花岗斑岩为微型岩株,岩石为强酸性花岗岩,富含Rb,Li,Be,Nb,Zr和Mo,其中Mo的含量为克拉克值的20倍,岩石稀土总量较低,为轻稀土富集型,Eu严重亏损;U-Pb同位素测年结果显示,加权平均年龄为(133.5±7.4)Ma,时代为中生代白垩纪早期,花岗斑岩的形成年龄基本上代表了钼矿床的成矿年龄;岩体侵入的构造背景为燕山晚期的板内造山环境;花岗斑岩的成因为S型与I型的过渡类型,岩浆物质原始来源于上地幔以浅,岩浆沿深大断裂上侵形成花岗斑岩,揭示出上地壳基底物质与岩浆的同熔过程。
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| 关 键 词： | 曹四夭钼矿 成矿岩体 花岗斑岩 岩石地球化学 U-Pb 同位素测年 成矿时代 内蒙古 |
| 收稿时间： | 2015-11-12 |
Geological-geochemical characteristics and U-Pb isotopic dating of Caosiyao Mo-granitic porphyry body in Xinghe County, Ulanqab Banner of Inner Mongolia |
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| LI Xiangzi,QUAN Zhixin,FU Hengyi,AN Jingwen and YANG Weikun. Geological-geochemical characteristics and U-Pb isotopic dating of Caosiyao Mo-granitic porphyry body in Xinghe County, Ulanqab Banner of Inner Mongolia[J]. Contributions to Geology and Mineral Resources Research, 2016, 31(3): 325-333. DOI: 10.6053/j.issn.1001-1412.2016.03.002 |
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| Authors: | LI Xiangzi QUAN Zhixin FU Hengyi AN Jingwen YANG Weikun |
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| Affiliation: | No.2 Geo-exploration Institute, Henan Provincial Bureau of Geo-exploration and Mineral Development, Zhengzhou 461000, China;No.2 Geo-exploration Institute, Henan Provincial Bureau of Geo-exploration and Mineral Development, Zhengzhou 461000, China;No.2 Geo-exploration Institute, Henan Provincial Bureau of Geo-exploration and Mineral Development, Zhengzhou 461000, China;No.2 Geo-exploration Institute, Henan Provincial Bureau of Geo-exploration and Mineral Development, Zhengzhou 461000, China;No.2 Geo-exploration Institute, Henan Provincial Bureau of Geo-exploration and Mineral Development, Zhengzhou 461000, China |
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| Abstract: | The super-large Mo deposit-hosted granitic porphyry body is the stronger acidic granite occur-ring in mini stock with less porphyritic crystals.It is rich in Rb,Li,Be,Nb,Zr and Mo.Its Mo content is as 20 times as clarke value.∑REE is low (122.388×10 -6 )belonging to LREE enrichment type with Eu depletion.The weighted U-Pb isotopic average age is 133.5 ±7.4 Ma corresponding to Early Cretaceous epoch.Rock-forming age of the granitic porphyry represents the ore-forming age.The intrusion occurred under intra-plate orogenic background during Late Yanshanian Period.It is a transitional type of S and I-type granite.The material source of magma is derived above the upper mantle and intrudes up along huge fault as syntactic granitic porphyry. |
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| Keywords: | Caosiyao Mo deposit the ore-hosted rock body granitic porphyry petrogeochemistry U-Pb isotopic dating the ore-forming age Inner Mongolia |
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