| 胡建民,刘光智,刘新会,徐述平.西秦岭寨上金矿地质-地球化学特征及成因探讨[J].地质找矿论丛,2008,(4):298-304 |
| 西秦岭寨上金矿地质-地球化学特征及成因探讨 |
| GEOLOGICAL-GEOCHEMICAL CHARACTERISTICS AND GENETIC DISCUSSION OF ZHAISHANG GOLD DEPOSIT IN THE WEST QINLING AREA |
| 投稿时间：2008-08-19 |
| DOI：10.6053/j.issn.1001-1412.2008.4. 006 |
| 中文关键词: 西秦岭 寨上金矿 成矿流体 稳定同位素 微量元素 稀土元素 |
| 英文关键词:the west Qinling Zhaishang gold deposit ore fluid stable isotope micro-element rare earth element |
| 基金项目:武警黄金指挥部黄金专项项目(2000~2008)资助 |
| 作者 | 单位 | | 胡建民 | 武警黄金第二总队, 河北, 廊坊, 065000 | | 刘光智 | 武警黄金第二总队, 河北, 廊坊, 065000 | | 刘新会 | 武警黄金第二总队, 河北, 廊坊, 065000 | | 徐述平 | 武警黄金第二总队, 河北, 廊坊, 065000 |
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| 中文摘要: |
| 西秦岭寨上金矿床分为南北两个矿带,受控于背斜构造的两翼,矿体呈板状,透镜状;主要的金属矿物有黄铁矿、毒砂、黝铜矿、辉锑矿、方铅矿.成矿期分沉积-成岩期、构造作用-热液叠加成矿期和表生氧化期;成矿流体属于中-低温、低盐度、低密度流体,压力集中在40~70MPa,成矿平均深度为5.73 km.流体包裹体气相成分以H2O和CO2为主,含N2,CH4,C2H2,C2H6,CO等;流体液相成分中,阳离子以Na+和Ca2+为主,阴离子以Cl-,SO42-为主,NO3-和F-次之.流体体系属Ca2+-Na+-Cl--SO42-型.印支-燕山期花岗岩岩浆上升侵位,深部流体沿深大断裂上移,与围岩发生物质交换,萃取了泥盆系、二叠系中的成矿元素,形成含矿流体,并在构造动力和热动力的驱动下,运移到构造有利部位,由于物理化学条件的变化使流体沸腾,金矿物沉淀成矿. |
| 英文摘要: |
| Zhaishang gold deposit in the west Qinling area is divided into the south and north ore zones and controlled by the limbs of an anticline.Ore occurs in tabular and lens bodies.Pyrite,arsenopyrite,tetrahydrite,stibnite and galena are the main metal minerals.The mineralization includes sedimentary-diagenesis,tectonic-hydrothermal fluid overprint and supergene ore-forming epochs.The ore fluid is in low temperature,low salinity and density with the ore-forming pressure concentrated in the range of 40-70 MPa and average ore-forming depth to 5.73 km.The gas phase of fluid inclusion is dominated by H2O and CO2,then by N2,CH4,C2H2,C2H6,CO etc.In the fluid phase Na+ and Ca2+ are the dominant cations and Cl-,SO2-4 the dominant negative ions then NO3-and F-thus the fluid belongs to Ca2+-Na+-Cl——SO42-system.Indo-Chinese-Yanshanian magma emplaced to upper level with deep fluid moving up along the deep-seated fracture and materials exchange between the fluid and wall-rocks taking place and extracting ore elements from Devonian and Permian strata and the ore fluid formed.The ore-fluid is motivated by tectonic and thermal dynamics to favorable tectonic position and boiled due to change of physiochemical condition with gold minerals precipitated to form gold ore. |
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