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黄金科学技术 ›› 2024, Vol. 32 ›› Issue (1): 31-40.doi: 10.11872/j.issn.1005-2518.2024.01.004

• 矿产勘查与资源评价 • 上一篇    下一篇

浙江衢州九华山侵入岩年代学和地球化学特征

刘风龙1(),王加恩2,刘远栋3,孙大亥3,程海燕3,胡艳华3,黄雯2,王振3,潘少军3   

  1. 1.浙江省地矿科技有限公司,浙江 杭州 310007
    2.浙江省国土整治中心,浙江 杭州 311000
    3.浙江省地质院,浙江 杭州 310007
  • 收稿日期:2023-01-03 修回日期:2023-06-27 出版日期:2024-02-29 发布日期:2024-03-22
  • 通讯作者: 刘远栋 E-mail:1156225426@qq.com
  • 作者简介:刘风龙(1987-),男,甘肃会宁人,工程师,从事区域地质调查工作。1156225426@qq.com
  • 基金资助:
    中国地质调查局项目“浙江省杜泽镇(H50E018020);大同镇(H50E017021);兰溪市(H50E017022);汤溪镇(H50E018022);金华市(H50E018023┫1∶5万区域地质矿产调查”项目┣12120113065000);“浙江1∶5万双溪镇、丽水市、大港头镇、章村幅区域地质调查”项目(1212011120869)

Geochronology and Geochemistry Characteristics of Jiuhuashan Intrusion Rocks in Quzhou,Zhejiang Province

Fenglong LIU1(),Jia’en WANG2,Yuandong LIU3,Dahai SUN3,Haiyan CHENG3,Yanhua HU3,Wen HUANG2,Zhen WANG3,Shaojun PAN3   

  1. 1.Zhejiang Geology and Mineral Technology, Hangzhou 310007, Zhejiang, China
    2.Zhejiang Provincial Institute of Land Improvement, Hangzhou 311000, Zhejiang, China
    3.Zhejiang Institute of Geosciences, Hangzhou 310007, Zhejiang, China
  • Received:2023-01-03 Revised:2023-06-27 Online:2024-02-29 Published:2024-03-22
  • Contact: Yuandong LIU E-mail:1156225426@qq.com

摘要:

在浙江西部九华山一带开展区域地质调查工作的基础上,选择九华山花岗岩岩体开展了LA-ICP-MS锆石U-Pb测年,获得岩体的加权平均年龄为(132.7±4.3)Ma,属于早白垩世岩体。采用同位素年代学和岩石地球化学等研究手段,对九华山岩体年龄进行重新解剖,分析其地球化学特征和Sr-Nd同位素特征,并探讨岩浆源区。结果表明:九华山岩体具有高硅、富铝碱、相对富钾贫钠和贫钙镁等特点;SiO2含量为68.58%~72.21%,具有准铝质—过铝质和高钾钙碱性—钾玄岩系列特征;微量元素分布表现出明显的Sr、Ba、Ti和P负异常,稀土元素分布表现出明显的负Eu异常,具有典型A型花岗岩的特征。岩体样品的εNd(t)值为-6.3~-5.8,平均值为-6.0,二阶段模式年龄TDM2(Nd)为1.34~1.43 Ga,平均值为1.40 Ga。研究表明:岩体的岩浆来源主要为中元古代基底物质,加入了一定的幔源物质,具有壳—幔混合特征。

关键词: 九华山花岗岩体, 锆石U-Pb测年, 岩石地球化学, A型花岗岩, 浙江省

Abstract:

The Jiangshan-Shaoxing tectonic belt is characterized by the development of numerous Late Cretaceous acidic volcanic-intrusive rock masses,such as Baijuhua granite,Cuishan granite,and Dazhou rhyolite.Previous studies on the chronology of these rocks indicate that they were formed between 137~126 Ma,and the geochemical studies show that these rock masses have geochemical characteristics of A-type granites.These studies are of significant geological importance for understanding the genesis and tectonic background of the rock bodies in the Jiangshan-Shaoxing tectonic belt.Based on the regional geological survey in the Jiuhuashan area of western Zhejiang Province,LA-ICP-MS zircon U-Pb dating of Jiuhuashan granite rock mass was carried out,the results indicate that the Jiuhuashan rock mass was formed in (132.7±4.3)Ma,which is the product of early Cretaceous volcanic activity.By means of isotope chronology and rock geochemistry,the diagenetic age of Jiuhuashan rock mass was re-dissected,its geochemical charateristics and Sr-Nd isotope charateristics were analyzed,and the magma source area was discussed.The results show that the Jiuhuashan rock mass has the characteristics of high silicon,rich aluminum alkali,relatively high potassium and low sodium,and low calcium and magnesium.The content of SiO2 is 68.58%~72.21%,which has the characteristics of quasi-aluminous-peraluminous and high-potassium calc-alkaline-basalt series.The distribution of trace elements shows significant negative anomalies in Sr,Ba,Ti,and P,and the distribution of rare earth elements shows obvious negative Eu anomalies,which has the typical features of A-type granites.The εNd(t) values of the rock samples range from -6.3 to -5.8,with an average value of -6.0 and the two-stage model age TDM2(Nd) ranges from 1.34 Ga to 1.43 Ga,with an average of 1.40 Ga.The results show that the magma source of the rock mass is mainly the Mesoproterozoic basement,but some mantle-derived material is added,which has the characteristics of crust-mantle mixing.

Key words: Jiuhuashan granite rock mass, zircon U-Pb dating, rock geochemistry, A-type granite, Zhejiang Province

中图分类号: 

  • P588.12

图1

九华山花岗岩体地质简图α-安山岩;β-辉绿岩;γ-花岗岩;γοπ-霏细斑岩; 1.黄尖组一段;2.劳村组二段;3.细粒花岗岩;4.中粒花岗岩;5.花岗斑岩;6.砂岩;7.流纹质含角砾晶屑熔结凝灰岩;8.角岩化;9.黄铁矿化;10.硅化;11.褐铁矿化;12.钾长石化;13.岩相界线"

图2

中—粗粒花岗岩手标本和镜下特征Qtz-石英;Pl-斜长石;Kfs-钾长石;Bt-黑云母"

表1

九华山岩体主量元素(%)、稀土和微量元素(×10-6)分析结果"

元素(化合物)样品分析结果
D0907-1D0907-2PM015-7PM015-12PM015-14PM015-11D0205D1011
SiO270.5069.9972.2170.3767.5971.1968.8468.58
Al2O313.7614.2914.5914.0314.8413.8214.2313.73
Fe2O30.840.991.842.042.791.530.870.59
FeO1.982.010.161.061.101.402.732.51
K2O5.635.906.165.044.046.065.315.49
Na2O3.743.602.003.484.843.213.342.91
CaO1.361.430.441.381.100.931.781.84
MgO0.430.480.290.410.920.360.490.35
MnO0.0490.0560.0330.0500.0510.0500.1100.100
TiO20.350.360.130.280.530.300.420.34
P2O50.1200.0890.0210.0690.1290.0690.1300.100
烧失量0.490.562.101.661.840.880.552.35
总计99.2599.7599.9899.8799.7799.8198.898.89
Zr320336210309381317353317
Hf13.514.17.4210.618.910.913.912.7
Li10.812.813.816.513.417.415.231.7
Cd0.140.100.280.140.550.110.0510.08
W1.491.562.041.771.793.0731.9028.90
Cs2.062.275.733.592.923.992.485.41
V19.3018.006.6714.1038.2012.6024.3016.70
Cr5.993.922.643.026.323.515.704.01
Co3.363.4016.501.915.652.574.413.36
Ni2.221.551.191.492.961.152.632.00
F695500451662485527837616
Rb129130156140104148129144
Sr16715737.961.610211913678.8
Ba9859669858571 0708521 3901 042
Ta0.941.020.860.781.100.951.021.03
Th14.516.220.41714.517.313.414.6
U1.631.583.872.102.142.371.902.25
Nb17.917.811.812.115.016.917.917.0
Y29.030.133.729.430.529.431.931.0
La73.293.170.911047.188.688.598.9
Ce138176303220121167214233
Pr16.120.521.921.511.219.019.120.8
Nd64.680.987.584.347.575.473.079.8
Sm10.3012.1019.0012.909.0311.3011.4012.30
Eu1.561.621.291.451.651.321.721.62
Gd8.229.2512.0010.107.498.368.579.10
Tb1.031.161.421.111.021.071.121.13
Dy5.676.127.35.855.825.826.286.24
Ho1.081.151.331.081.141.111.191.18
Er3.203.323.993.213.383.293.363.46
Tm0.480.510.520.420.460.500.470.47
Yb3.073.223.412.742.993.183.073.03
Lu0.460.470.500.400.430.460.460.46
ΣREE326.97409.42534.06475.06260.21386.41431.85471.34
LREE/HREE13.0915.2516.5318.0710.4515.2416.6217.81
LaN/YbN17.1020.7414.9128.8011.3019.9920.6823.44
δEu0.500.450.240.370.600.400.510.45
A/CNK0.930.961.351.021.031.020.980.97

图3

九华山岩体主量元素分布特征Ir-Irvine分界线,上方为碱性,下方为亚碱性;1-橄榄辉长岩;2a-碱性辉长岩;2b-亚碱性辉长岩;3-辉长闪长岩;4-闪长岩;5-花岗闪长岩;6-花岗岩;7-硅英岩;8-二长辉长岩;9-二长闪长岩;10-二长岩;11-石英二长岩;12-正长岩;13-副长石辉长岩;14-副长石二长花岗岩;15-副长石二长正长岩;16-副长石正长岩;17-副长石深成岩"

图4

九华山岩体稀土元素球粒陨石标准化配分模式图"

图5

九华山岩体微量元素原始地幔标准化蛛网图"

图6

九华山岩体锆石CL图像和谐和年龄图"

表2

九华山岩体锆石U-Pb测试结果"

分析点

Th/

(×10-6

U/

(×10-6

Th/ULA-ICP-MS U-Pb同位素比值LA-ICP-MS U-Pb同位素年龄/Ma
207Pb/206Pb1σ207Pb/235U1σ206Pb/238U1σ207Pb/206Pb1σ207Pb/235U1σ206Pb/238U1σ
TW0129.6653.180.560.051640.002820.147480.007720.020710.0003227012814071322
TW029.6223.400.410.051000.003300.151930.009570.021600.0005124115014481383
TW0311.7635.870.330.057860.003160.171990.008800.021560.0004252512316181373
TW0417.7241.880.420.052040.002820.141060.007280.019660.0003328712713461262
TW0617.0038.830.440.050180.001040.147830.003270.021370.000312034914031362
TW0815.0540.030.380.050710.001050.153140.003370.02190.000322284914531402
TW0927.2359.990.450.052510.001020.144880.003010.020010.000293084513731282
TW1321.7356.110.390.050350.000930.141870.002850.020440.000292114413531302
TW154.0620.330.200.033090.007230.067980.014630.014910.00062-1522696714954

表3

九华山岩体Sr-Nd同位素分析结果"

样品编号87Rb/86Sr87Sr/86SrIsr(t147Sm/144Nd143Nd/144NdεNd(tTDM/MaTDM2/Ma
PM015-122.27270.7210450.716780.15300.51228-6.32 1831 432
PM015-141.01960.7143210.712410.19010.512324-6.05 2901 400
D00220.83330.7136940.712130.20580.512349-5.814 9481 342
D09070.77250.7129800.711530.15940.512293-6.12 4041 419
PM015-111.24370.7143470.712010.14990.512295-5.92 0401 404

图7

九华山岩体Sr同位素演化图解"

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