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黄金科学技术 ›› 2023, Vol. 31 ›› Issue (3): 423-432.doi: 10.11872/j.issn.1005-2518.2023.03.128

• 矿产勘查与资源评价 • 上一篇    下一篇

海南富文金矿床矿石、围岩及地层元素地球化学特征及地质意义

崔文玮1(),晁会霞1(),何虎军1,杨兴科1,杨俊杰1,朱昊磊1,吴旭2   

  1. 1.长安大学地球科学与资源学院,陕西 西安 710054
    2.中国地震局地球物理研究所,北京 100081
  • 收稿日期:2022-09-27 修回日期:2023-02-09 出版日期:2023-06-30 发布日期:2023-07-20
  • 通讯作者: 晁会霞 E-mail:869934539@qq.com;chaohuixia1@163.com
  • 作者简介:崔文玮(1997-),女,山西晋城人,硕士研究生,从事矿产勘查研究工作。869934539@qq.com
  • 基金资助:
    新北京垚鑫矿业公司委托项目“海南定安金矿成矿背景、控矿条件和勘查靶区研究”、陕西省自然科学基金项目“地质大数据挖掘与智能预测找矿靶区实验研究”(2023-JC-YB-261);“利用飞秒激光质谱研究钨矿蚀变带的微量元素分异及找矿标志——以南秦岭棋盘沟钨矿为例”(2023-JC-YB-276)

Element Geochemical Characteristics and Significance of Ore,Wall Rock and Stratum in Fuwen Gold Deposit,Hainan

Wenwei CUI1(),Huixia CHAO1(),Hujun HE1,Xingke YANG1,Junjie YANG1,Haolei ZHU1,Xu WU2   

  1. 1.School of Earth Science and Resources, Chang’an University, Xi’an 710054, Shaanxi, China
    2.Institute of Geophysics, China Earthquake Administration, Beijing 100081, China
  • Received:2022-09-27 Revised:2023-02-09 Online:2023-06-30 Published:2023-07-20
  • Contact: Huixia CHAO E-mail:869934539@qq.com;chaohuixia1@163.com

摘要:

海南富文金矿床位于华南褶皱系五指山褶皱带北缘,主要出露早白垩世鹿母湾组(K1l)含砾碎屑沉积岩。金矿体呈脉状和似层状赋存于鹿母湾组砂岩层间破碎带中。为进一步探讨富文金矿的成矿物质来源,对石英脉型矿石、赋矿围岩鹿母湾组碎屑沉积岩及岩浆岩进行主量、微量和稀土元素测试分析。结果显示:矿石与围岩地层、岩浆岩具有相似的微量元素变化趋势以及相似的稀土配分模式,预示着成矿与地层、岩浆岩关系密切。早白垩世石英闪长岩、细粒花岗岩和碎屑沉积岩均为矿体的形成提供了成矿物质,矿床类型为岩浆热液型金矿。

关键词: 物质来源, 地球化学, 微量元素, 稀土元素, 岩浆热液型金矿, 富文金矿

Abstract:

The Fuwen gold deposit is located in Fuwen County,central and northern Hainan Province,and also in the northern margin of the Wuzhishan fold belt of the South China fold system.The Early Cretaceous Lumuwan Formation (K1l) is mainly exposed in the ore district.The structure in this area is developed,the magmatic volcanic movement is more frequent,the gold mineralization points are more,and the metallogenic geological conditions are better.Geological and mineral work was carried out earlier in the area,including geophysical exploration,geochemical exploration,mineral exploration,etc.,but these works focused on the ore fabric characteristics,sulfide characteristics,ore-forming fluid characteristics and isotope date of the deposit,and the research methods of element geochemical testing of gold deposits are less involved.In order to further explore the source of ore-forming materials of Fuwen gold deposit,this paper analyzed the main,trace and rare earth elements of quartz vein type ore,clastic sedimentary rock and magmatic rock of Lumuwan formation.The chemical analysis of the main components of the clastic sedimentary rocks in Lumuwan Formation shows that the weathering and alteration of the source area are weak,which reflects that the sedimentary rocks were first deposited in the active tectonic belt,and the provenance is mainly felsic rocks.The results of chemical analysis of rare earth elements show that REE is characterized by enriched LREE,lost HREE,and right-inclined normalized curve patterns,and the standardized distribution curves of REE in each sample are basically the same.It is inferred that the ore has homology with strata and rock masses.The results of trace element chemical analysis show that the ore,Lumuwan Formation strata and rock mass (quartz diorite,fine-grained granite) are significantly lost in Ba,Nb,Sr,Hf and enriched in Rb,Th,U,Pb,Sm,and their distribution trends are similar.Comprehensive analysis shows that the formation of Fuwen gold ore body in Hainan is closely related to Lumuwan strata and rock mass.Both of them provide ore-forming materials for the formation of ore bodies,and the deposit type is a magmatic hydrothermal deposit.

Key words: material source, geochemistry, trace element, REE, magmatic hydrothermal gold deposit, Fuwen gold deposit

中图分类号: 

  • P595

图1

富文地区地质简图(修改自张小文等,2007;晁会霞等,2016)1.第四系;2.白垩系;3.长城系;4.白垩纪花岗闪长岩;5.三叠纪二长花岗岩;6.正断层;7.断层;8.地层界限;9.地层不整合接触;10.金矿脉;11.矿区范围"

图2

富文矿区地质图(修改自吴旭,2017)1.第四纪中更新世气孔状橄榄玄武岩;2.早白垩世鹿母湾组碎屑岩;3.晚侏罗世花岗岩;4.早白垩世石英闪长岩;5.晚白垩世花岗岩;6.矿体及编号;7.产状;8.断层及编号;9.采样位置及编号"

图3

富文金矿矿石显微照片Py-黄铁矿;Gn-方铅矿;Apy-毒砂;Sp-闪锌矿;Ccp-黄铜矿;Mrc-白铁矿"

表1

鹿母湾组碎屑沉积岩主量元素含量及比值"

岩性样品编号SiO2TiO2Al2O3TFe2O3MnOMgOCaONa2OK2OP2O5
无矿化长石石英杂砂岩GH164.100.6613.518.310.052.345.091.113.110.15
GH267.090.5312.264.630.101.607.031.543.330.12
GH366.620.5714.335.030.112.463.613.132.470.13
GH469.250.6812.935.090.102.612.971.523.310.15
GH563.610.5810.264.820.161.9313.172.092.070.14
GH667.190.5212.144.960.121.886.923.001.850.12
黄铁矿化砂岩GH766.020.5310.394.470.121.8310.320.433.220.07
GH869.760.5111.674.270.081.835.660.513.580.08
平均值66.710.5712.195.200.112.066.851.672.870.12
上地壳平均值66.000.6515.204.500.082.204.203.903.400.15
岩性样品编号H2O+TotalAl2O3/TiO2K2O/Na2OFe2O3/K2OSiO2/Al2O3CIAPIAICV
无矿化长石石英杂砂岩GH11.4699.8920.472.802.674.7471.7182.411.23
GH21.689.9123.132.161.395.4765.6774.351.07
GH31.4499.9025.140.792.044.6562.1465.451.17
GH41.3099.9119.012.181.545.3667.0675.991.14
GH51.1099.9317.690.992.336.2062.1466.211.32
GH61.2099.9023.350.622.685.5360.7363.171.25
黄铁矿化砂岩GH72.3099.7019.607.491.396.3571.8089.291.05
GH82.06100.0122.887.021.195.9871.7388.800.96
平均值1.5799.8921.413.011.815.4766.6275.711.15
上地壳平均值---------

表2

富文金矿岩(矿)石样品稀土元素含量及参数"

岩性样品编号LaCePrNdSmEuGdTbDyHoErTmYb
石英闪长岩D043-135.4667.699.0034.075.811.756.420.834.550.892.530.362.15
细粒花岗岩D043-232.1460.338.0130.025.281.515.910.794.460.892.610.412.37
石英脉型矿石D050-219.7535.654.4515.592.480.532.550.261.410.250.790.120.70
碎屑沉积岩ZK1102-XT129.6857.817.6528.655.131.535.690.764.260.822.390.352.10
碎屑沉积岩ZK1503-XT124.6747.935.6922.883.990.924.210.422.870.531.560.231.29
碎屑沉积岩ZK1902-XT124.6248.786.0724.244.190.944.380.453.090.551.670.241.34
碎屑沉积岩ZK1903-XT138.5283.659.5737.957.101.667.640.975.891.033.240.452.65
碎屑沉积岩ZK2704-XT131.3858.777.1227.064.570.774.900.583.600.692.010.311.83
岩性样品编号LuY∑REELREEHREEL/HδEuδCe(La/Yb)N(La/Sm)N(Gd/Yb)N(Sm/Yb)N
石英闪长岩D043-10.3422.91171.86153.7918.078.510.870.8711.143.842.422.90
细粒花岗岩D043-20.3923.03155.13137.317.837.700.820.869.163.832.022.39
石英脉型矿石D050-20.117.0084.6478.456.1912.670.640.8619.075.012.953.80
碎屑沉积岩ZK1102-XT10.3421.65147.14130.4416.707.810.860.889.553.642.202.62
碎屑沉积岩ZK1503-XT10.2115.96117.4106.0811.329.370.680.9212.923.892.643.32
碎屑沉积岩ZK1902-XT10.2217.45120.78108.8411.949.120.660.9212.423.702.653.35
碎屑沉积岩ZK1903-XT10.4429.63200.76178.4522.318.000.681.009.823.422.342.87
碎屑沉积岩ZK2704-XT10.3020.05143.89129.6714.229.120.500.8911.594.322.172.68

图4

稀土元素球粒陨石标准化配分模式图(底图据Taylor et al.,1985)"

表3

富文金矿岩(矿)石样品微量元素含量及参数"

样品编号LiBeScVCrCoNiCuZnGaRbSrYZrNbCd
D043-18.062.0721.31189.3069.7053.4419.2314.55103.8023.47156.821092.6022.91125.9911.710.29
D043-28.662.2113.9890.8642.2359.3916.172.7371.2520.77359.79486.8623.03190.8410.810.39
D050-297.792.062.8035.469.1447.439.7503.6159.2713.42205.5127.097.0064.444.320.52
ZK1102-XT17.411.8315.90143.9029.4330.7211.7411.9880.2419.82205.42669.7121.65181.099.880.37
ZK1503-XT14.611.886.3871.8235.3824.4713.927.1459.1013.71330.50103.0115.96153.388.530.83
ZK1902-XT124.151.5811.66111.4038.9329.1814.1244.9252.1514.14208.77489.2117.45145.228.340.29
ZK1903-XT15.502.6019.3199.8957.2217.6135.223.4347.0324.73519.13259.3429.63148.0413.600.28
ZK2704-XT15.791.696.76101.4033.2821.4413.139.1381.8715.41289.55179.9120.05148.609.471.02
样品编号CsBaLaSmHoHfTaBiThUY/HoTh/UTh/ScCr/ZrNb/Ta
D043-11.83615.9335.465.810.894.001.020.039.051.5725.845.760.420.5511.51
D043-25.54847.9632.145.280.895.481.150.2013.594.4225.913.070.970.229.38
D050-23.99196.3019.752.480.251.980.600.117.801.8628.224.192.790.147.21
ZK1102-XT14.60415.1829.685.130.825.120.970.1413.222.8626.554.620.830.1610.17
ZK1503-XT14.86493.2824.673.990.534.600.961.8210.482.9130.123.611.640.238.90
ZK1902-XT14.83469.8124.624.190.554.160.950.3410.412.5631.734.070.890.278.76
ZK1903-XT111.01704.0638.527.101.034.611.570.2817.734.6128.763.840.920.398.67
ZK2704-XT14.440429.4431.384.570.694.461.110.0515.453.3629.064.592.290.228.53

图5

微量元素原始地幔标准化蛛网图(底图据Sun et al.,1989)"

图6

鹿母湾组碎屑沉积岩CIA-ICV指数图解(底图据Nesbitt et al.,1982; Cox et al.,1995)"

图7

鹿母湾组碎屑沉积岩分类图(底图据Herron,1988)"

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