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黄金科学技术 ›› 2024, Vol. 32 ›› Issue (5): 798-812.doi: 10.11872/j.issn.1005-2518.2024.05.146

• 特约专栏 • 上一篇    下一篇

胶东地区早白垩世周官高镁闪长岩体年代学、地球化学特征及其构造意义

王斌1,2(),宋明春3(),刘志宁1,李健4,董磊磊5,张艺多1,蒋雷1,王润生6,董小涛1,刘家良1   

  1. 1.山东省地质矿产勘查开发局第六地质大队(山东省第六地质矿产勘查院),自然资源部深部金矿勘查开采技术创新中心,山东 威海 264209
    2.吉林大学地球科学学院,吉林 长春 130061
    3.河北地质大学地球科学学院,河北省战略性关键矿产资源重点实验室,河北 石家庄 050031
    4.山东理工大学资源与环境工程学院,山东 淄博 255000
    5.北京科技大学土木与资源工程学院,北京 100080
    6.山东省物化探勘查院,山东 济南 250013
  • 收稿日期:2024-05-20 修回日期:2024-07-09 出版日期:2024-10-31 发布日期:2024-09-19
  • 通讯作者: 宋明春 E-mail:wangbinjlu@163.com;mingchuns@163.com
  • 作者简介:王斌(1990-),男,山东聊城人,工程师,从事矿产勘查、大地构造与成矿研究工作。wangbinjlu@163.com
  • 基金资助:
    国家自然科学基金NSFC-山东省联合基金项目“胶东深部金矿断裂控矿机理”(U2006201);河北省人才项目“冀北地区金成矿系统及深部找矿技术”(HBQZYCXY0010);山东省地矿局科技攻关项目“胶西北断裂系统及其与金成矿关系”(KY202208);“伟德山期侵入岩岩浆演化与多金属成矿作用”(KY202209)

Geochronology,Geochemical Characteristics and Tectonic Implications of Early Cretaceous Zhouguan High-Mg Diorite Rock Mass in the Jiaodong Peninsula

Bin WANG1,2(),Mingchun SONG3(),Zhining LIU1,Jian LI4,Leilei DONG5,Yiduo ZHANG1,Lei JIANG1,Runsheng WANG6,Xiaotao DONG1,Jialiang LIU1   

  1. 1.Ministry of Natural Resources Technology Innovation Center for Deep Gold Resources Exploration and Mining, No. 6 Geological Team of Shandong Provincial Bureau of Geology and Mineral Resources, Weihai 264209, Shandong, China
    2.College of Earth Sciences, Jilin University, Changchun 130061, Jilin, China
    3.Hebei Key Laboratory of Strategic Critical Mineral Resources, College of Earth Sciences, Hebei GEO University, Shijiazhuang 050031, Hebei, China
    4.School of Resources and Environmental Engineering, Shandong University of Technology, Zibo 255000, Shandong, China
    5.School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100080, China
    6.Shandong Institute of Geophysical and Chemical Exploration, Jinan 250013, Shandong, China
  • Received:2024-05-20 Revised:2024-07-09 Online:2024-10-31 Published:2024-09-19
  • Contact: Mingchun SONG E-mail:wangbinjlu@163.com;mingchuns@163.com

摘要:

胶东地区是我国最重要的金矿集区,金矿床的时空分布与晚中生代花岗岩类密切相关,其中早白垩世伟德山期花岗岩侵位时间与大规模金成矿时间一致,是重要的成矿期地质体。隶属于伟德山期花岗岩的周官岩体与金成矿时空关系密切。选择周官岩体作为研究对象,系统开展了岩石学、锆石U-Pb同位素测年和全岩地球化学研究工作。结果表明:周官岩体侵位时代为(119.4±1.1)~(118±1.0)Ma,与金成矿同期;岩体具有低硅、高镁和富钠,以及相对高的Cr、Ni、Co、Sc含量、Sr/Y比值和明显贫化的Zr含量特征,Mg#值介于55.83~59.26,表现为高镁闪长岩特征。岩石属高钾钙碱性系列,为高镁闪长岩类,岩浆源于富集岩石圈地幔的部分熔融,并混染了部分地壳物质;周官高镁闪长岩体和伟德山期花岗岩的岩浆侵位导致地壳浅部发生剧烈隆起,形成伸展构造,为成矿流体运移、成矿物质富集和矿体定位提供了良好通道和有利空间。

关键词: 周官高镁闪长岩体, 锆石U-Pb测年, 地球化学特征, 富集岩石圈地幔, 胶东半岛

Abstract:

The Jiaodong region represents the most significant gold ore cluster in China,with the temporal and spatial distribution of gold deposits being closely associated with Late Mesozoic granites.The emplacement timing of the Early Cretaceous Weideshan granite aligns with the epoch of large-scale gold mineralization,marking it as a crucial geological body for ore formation.The Zhouguan rock mass,a constituent of the Weideshan granite,exhibits a strong spatial and temporal correlation with gold mineralization.Based on comprehensive studies encompassing systematic petrology,zircon U-Pb isotope dating,and whole rock major and trace element geochemistry,the Zhouguan rock mass was emplaced during the late Early Cretaceous period,specifically between (119.4±1.1)Ma and (118±1)Ma.This emplacement coincided temporally with gold mineralization events.The rock mass is characterized by low silicon (Si),high magnesium (Mg),and rich sodium (Na) content,along with relatively elevated concentrations of chromium (Cr),nickel (Ni),cobalt (Co),and scandium (Sc),as well as a high Sr/Y ratio and significantly depleted zirconium (Zr) content.These rocks are classified within the high-potassium calc-alkaline series and are identified as high-Mg diorite.The magma is derived from the partial melting of the enriched lithospheric mantle and incorporates some crustal materials.The emplacement of magma in the Zhouguan rock mass and Weideshan granite induced significant uplift of the shallow crust,leading to the formation of a series of extensional structures.These structures facilitated the migration of ore-forming fluids and created favorable conditions for fluid enrichment and orebody formation.

Key words: Zhouguan high-Mg diorite rock mass, zircon U-Pb dating, geochemical characteristics, enriched lithosphere mantle, Jiaodong Peninsula

中图分类号: 

  • P618.51

图1

胶东地区金矿分布简图(修改自宋明春等,2018b;Wang et al.,2024)1.太古宙变质基底;2.元古宙变质地层;3.苏鲁超高压变质岩系;4.白垩纪火山沉积地层;5.第四纪地层;6.三叠纪石岛花岗岩类;7.侏罗纪玲珑花岗岩类;8.白垩纪郭家岭期花岗岩类;9.白垩纪伟德山期花岗岩类;10.白垩纪崂山期花岗岩类;11.缝合带;12.区域断裂;13.金矿"

图2

研究区周官岩体出露分布图1.第四系;2.新太古代栖霞序列片麻岩;3.玲珑期花岗岩;4.周官高镁闪长岩体;5.中—酸性脉岩;6.煌斑岩脉;7.山峰;8.采样位置"

图3

周官岩体岩石手标本及镜下照片(a)、(b)石英闪长岩(ZGYT01);(c)、(d)二长闪长岩(ZGYT02);Qtz-石英;Pl-斜长石;Kfs-钾长石;Bt-黑云母;Hbl-角闪石;Ser-绢云母"

表1

周官岩体锆石U-Pb同位素分析结果"

分析点Th/ULA-ICP-MS U-Pb同位素比值LA-ICP-MS U-Pb同位素年龄/Ma
207Pb/235U1s%206Pb/238U1s%Rho206Pb/238U2s (abs)207Pb/235U2s (abs)
ZGYT01.11.00.12546.90.018161.80.22116411915
ZGYT01.21.10.11367.40.018461.60.02118410815
ZGYT01.31.20.13445.10.018981.6-0.11121412712
ZGYT01.41.00.11986.80.018581.7-0.13119411415
ZGYT01.51.10.13364.10.019031.80.26122412710
ZGYT01.61.00.12568.20.019101.90.00122511818
ZGYT01.71.40.13247.90.018563.50.12118812519
ZGYT01.81.10.12056.00.018301.90.22117411513
ZGYT01.91.10.12386.80.018701.5-0.14119411715
ZGYT01.101.10.11407.40.018951.70.20121410815
ZGYT01.111.00.11505.80.018542.3-0.02118511012
ZGYT01.121.30.12386.70.018381.50.04118411715
ZGYT01.131.30.12845.80.018601.60.02119412213
ZGYT01.141.00.12987.70.019432.00.00124512218
ZGYT01.151.10.12066.20.018961.70.01121411513
ZGYT02.11.10.11638.90.018442.30.28118511018
ZGYT02.21.10.12546.10.019202.2-0.02123511914
ZGYT02.31.10.11877.40.018321.60.14117411216
ZGYT02.41.00.11737.60.018551.6-0.05118411116
ZGYT02.51.10.13025.90.018621.5-0.34119412314
ZGYT02.61.10.13216.80.018761.30.29120312516
ZGYT02.71.00.12395.50.018141.60.06116411812
ZGYT02.81.00.11918.80.019333.0-0.10123711319
ZGYT02.91.10.13075.50.018271.4-0.30117312413
ZGYT02.101.70.11985.40.018411.4-0.29118311412
ZGYT02.111.10.11986.60.018731.50.01120411414
ZGYT02.121.10.13546.10.018892.0-0.11121512815
ZGYT02.131.00.132910.70.018163.0-0.26116712525
ZGYT02.141.10.13505.70.018441.7-0.06118412714
ZGYT02.151.10.12267.20.018212.10.12116511616

图4

周官岩体锆石U-Pb同位素年龄图解"

表2

周官岩体岩石主量(%)、微量(×10-6)和稀土元素(×10-6)分析结果"

元素(化合物)样品分析结果
石英闪长岩(Zg01)石英闪长岩(Zg02)二长闪长岩(Zg03)石英闪长岩(Zg04)二长闪长岩(Zg05)二长闪长岩(Zg06)
SiO258.9258.4860.9757.8060.2660.98
TiO20.660.800.620.750.670.59
Al2O316.8615.5915.4415.8416.6716.41
TFe2O35.606.275.126.155.265.08
MnO0.100.090.080.090.080.08
MgO3.704.523.344.513.353.26
CaO5.706.004.416.154.785.13
Na2O3.933.523.533.553.804.03
K2O2.272.563.352.573.692.74
P2O50.250.270.230.280.290.23
LOI1.001.372.371.450.760.77
总计99.0099.5499.4699.2099.6299.31
FeO3.313.702.684.063.453.02
Na2O+K2O6.206.076.886.127.496.77
A/CNK0.870.800.880.800.880.87
A/NK1.891.821.641.831.631.71
Mg#56.6858.8156.3659.2655.8355.97
Ti3 891.754 667.553 573.664 350.153 781.523 425.05
Rb55.6258.9768.7155.1884.5468.85
Sr1 210.431 202.68933.491 186.591 096.021 140.04
Y11.7719.8016.7119.8214.2713.64
Zr89.09143.76198.81173.14107.91163.30
Nb4.987.777.418.817.116.38
Mo0.151.650.291.272.300.32
Cd0.050.030.010.030.030.03
Ba1 850.631 470.562 117.121 283.362 399.251 756.46
La44.5357.4066.4858.7355.9357.28
Ce79.16109.59122.49114.60103.69103.98
Pr8.5612.5012.8713.0511.0810.87
Nd31.5047.7744.2248.4939.0438.21
Sm4.997.966.567.905.995.75
Eu1.641.901.591.921.461.48
Gd3.375.364.135.243.863.64
Tb0.440.720.570.710.520.49
Dy2.313.763.043.732.692.55
Ho0.440.720.590.720.510.49
Er1.091.821.571.861.321.28
Tm0.160.260.240.270.190.19
Yb0.941.591.481.691.191.18
Lu0.140.230.220.250.180.18
Hf2.324.055.154.782.964.12
Ta0.310.460.430.540.430.50
Pb17.8514.7319.1815.3219.4816.66
Bi0.040.050.020.060.030.03
Th6.4110.407.3010.8410.7411.57
U0.972.151.252.171.452.13
∑REE179.25251.59266.06259.16227.64227.58
∑LREE/∑RREE19.2016.3921.4616.9120.7821.75
δEu(Eu/Eu*)1.160.840.870.860.870.93
δCe(Ce/Ce*)0.920.940.950.960.950.94
(Ce/Yb)N21.7617.8121.3417.5222.5722.80
(Gd/Yb)N2.892.722.252.502.622.49
Sr/Y102.8260.7355.8759.8676.8183.56
(La/Yb)N31.9124.3130.1923.4031.7332.74
Nb/Ta16.0716.9017.4016.4516.3412.75

图5

周官岩体地球化学分类图解(a)花岗岩TAS图解;(b)K2O-SiO2图解;(c)A/NK-A/CNK图解(底图分别据Middlemost,1994;Rickwood,1989;Maniar et al.,1989)"

图6

周官岩体的稀土元素球粒陨石标准化配分模式图解(a)和微量元素原始地幔标准化蛛网图(b)(稀土和微量元素标准化值分别据Boynton,1984;Sun et al.,1989)"

图7

周官岩体岩石Na2O-K2O(a)、MgO-SiO2(b)、(La/Yb)N-YbN(c)和Sr/Y-Y(d)图解(底图分别据Collins et al.,1982;Defant et al.,1990;Rapp et al.,1999)"

图8

胶东半岛早白垩世地球动力学模式图(修改自Zhu et al.,2015;Wang et al.,2024)1.软流圈;2.岩石圈地幔;3.地壳;4.上覆沉积物;5.海洋;6.岩浆侵入体;7.金矿化体注:橙色箭头表示俯冲板块释放的流体;黑色箭头表示强烈的地幔对流导致软流圈上涌和岩石圈剥离加剧;白色箭头表示俯冲角度的变化"

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