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J4 ›› 2010, Vol. 18 ›› Issue (2): 1-5.

• 矿产勘查 •    下一篇

陕西龙头沟金矿床的地质地球化学特征及成因探讨

 胡西顺, 原莲肖, 朱红周, 刘新伟, 薛杉   

  1. 西北有色地质研究院
  • 出版日期:2010-04-30 发布日期:2013-11-19

Geological and Geochemical Characteristics and Genesis of Longtougou Gold Deposit in Shaanxi Province

  1. Northwestern Nonferrous Geological Research Institute
  • Online:2010-04-30 Published:2013-11-19

摘要:

    龙头沟金矿赋存于砂岩地层中,受背斜翼部剪切断裂控制,呈脉状成群分布,主要蚀变有硅化、(铁)碳酸盐化、重晶石化和黄铁矿化。矿石的稀土元素总量为56.1×10-6~291.0×10-6,ΣCe/ΣY变化范围为0.362~1.304,平均为0.941,稀土分布以平坦型为主;δEu变化系数范围为3.35~8.58,平均为5.12;δCe变化范围为0.73~0.74,为Ce负异常;Sm/Nd矿体变化范围为0.313~0.447,大于0.3,反映其物质来源有幔源特征。δ34S变化范围为0.39‰~3.74‰,表现为深源或幔源硫。δ30Si值为0.2‰,反映成矿与花岗岩岩浆热液活动有关。氢、氧同位素特征表明本区水的来源主要是大气降水。成矿温度为260~280 ℃,矿床成因类型为受构造控制的中温岩浆热液型金矿床。

关键词: 地质特征, 地球化学特征, 矿床成因, 龙头沟金矿床, 陕西省

Abstract:

The Longtougou gold deposit lies in the sedimental formation,confined by the shear fracture on the wing of anticline and distributed in vein groups.The major alterations consist of silicification,ferrocarbonation,barition, pyritization.The total amount of rare elements in ores is 56.1 × 10-6 ~ 291 × 10-6,ΣCe / ΣY changes in the range of 0.362 to 1.304,with an average of 0.941,and rare earth distribution patterns belong to the flat-oriented;δEu changes in the range of 3.35 to 8.58,With an average of 5.118;δCe changes in the range of 0.73 to 0.74 with the negative Ce anomaly;Sm/Nd changes in 0.313 ~ 0.447, greater than 0.3,reflecting its source material characteristics of the mantle.δ34S changes in the range of 0.39 ‰ ~ 3.74 ‰,which is the performance of the deep mantle source or sources of sulfur.δ30Si value is 0.2 ‰,which reflects the mineralization was bound up with granite magma-hydrothermal activity.Hydrogen and oxygen isotopes show that the characteristics of the mining water source is mainly precipitation.The forming temperature focused mainly on 260~ 280 ℃.The type of ore deposits is defined into the magmatic temperature hydrothermal gold deposit.

Key words: Geological characteristics, Geochemical characteristics, Genesis of deposit, Longtougou gold deposit, Shaanxi Province

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