| 黑龙江霍吉河钼矿成矿地质特征及花岗闪长岩年代学、地球化学特征 |
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| 引用本文： | 陈静,孙丰月,潘彤,王瑾,霍亮.黑龙江霍吉河钼矿成矿地质特征及花岗闪长岩年代学、地球化学特征[J].吉林大学学报(地球科学版),2012(Z1):207-215. |
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| 作者姓名： | 陈静 孙丰月 潘彤 王瑾 霍亮 |
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| 作者单位： | 青海省地质矿产研究所;青海省地质调查院青藏高原北部地质过程与矿产资源重点实验室;吉林大学地球科学学院 |
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| 基金项目： | 国土资源大调查项目(资[2010]矿评01-20-06) |
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| 摘 要： | 霍吉河钼矿床位于小兴安岭—张广才岭成矿带北段,是近年发现的钼矿床。该钼矿含矿岩体主要为黑云母花岗闪长岩,钼矿体大多数呈细脉浸染状在花岗闪长岩中绕角砾岩筒分布。含矿花岗闪长岩锆石U-Pb谐和年龄为(184.0±1.5)Ma,形成于燕山早期;其SiO2质量分数为60.06%～69.34%、K2O和Na2O质量分数分别为3.36%～5.78%和2.60%～3.78%,铝指数A/CNK=0.78～0.98,属于偏铝质高钾钙碱性I型花岗岩;轻重稀土分馏强烈(LaN/YbN=10.96～24.99),Eu负异常不明显(Eu/Eu*=0.72～0.86);富集Rb、Ba、Th、U、K、Pb和Sr等元素,亏损Nb、Ta、Ti、Y和Yb等元素,这或者暗示其岩浆源区相对富水,或者反映岩浆源区可能遭受过俯冲带流体的交代作用,其形成与太平洋板块俯冲作用有关。结合主成矿温度、成矿地质特征及成矿构造背景,认为霍吉河钼矿成因应属于斑岩型钼矿。
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| 关 键 词： | 霍吉河钼矿 锆石U-Pb年龄 地球化学 太平洋板块 |
Geological Features of Huojihe Molybdenum Deposit in Heilongjiang, and Geochronology and Geochemistry of Mineralized Granodiorite |
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| Chen Jing,Sun Feng-yue,Pan Tong,Wang Jin,Huo Liang.Geological Features of Huojihe Molybdenum Deposit in Heilongjiang, and Geochronology and Geochemistry of Mineralized Granodiorite[J].Journal of Jilin Unviersity:Earth Science Edition,2012(Z1):207-215. |
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| Authors: | Chen Jing Sun Feng-yue Pan Tong Wang Jin Huo Liang |
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| Institution: | 1.Geology and Mineral Resources Institute of Qinghai Province,Xining 810012,China 2.The Northern Qinghai-Tibet Plateau Geological Processes and Mineral Resources Laboratory, Qinghai Geological Survey Institute,Xining 810012,China 3.College of Earth Sciences,Jilin University,Changchun 130061,China |
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| Abstract: | Huojihe molybdenum deposit discovered recently is located in the northern section of the Xiao Hinggan Mountain-Zhangguangcai Mountain metallogenic belt.The ore-bearing rocks are mainly biotite granodiorite and molybdenum ores are mostly disseminated around a breccia pipe in the biotite granodiorite intrusion.Using zircon U-Pb dating method,a precise age data of(184.0±1.5) Ma for the ore-bearing granodiorite is obtained.Geochemical results indicate that SiO2 content of the ore-bearing biotite granodiorite is 60.06%~69.34%,K2O and Na2O contents are 3.36%~5.78% and 2.60%~3.78% respectively.Its aluminum Index is 0.78~0.98,implying the intrusion belongs to high K calc-alkaline I-type granite.The ore-bearing biotite granodiorite are also featured by intense REE fractionation(LaN/YbN=10.96~24.99),negative Eu(Eu/Eu*=0.72~0.86)anomalies,Rb,Ba,Th,U,K,Pb,Sr enrichment and Nb,Ta,Ti,Y,Yb depletion,suggesting a relatively water-rich magma source,or the magma may have suffered from metasomatism by subduction zone fluid,a processes propbably controlled by the subduction of the Pacific plate in early Yanshanian period.According to the main mineralization temperature,geological characteristics and ore-forming tectonic setting,it is considered that the Huojihe molybdenum deposit should belong to porphyry type. |
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| Keywords: | Huojihe molybdenum mine zircon U-Pb age geochemistry Pacific plate |
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