Geochronology, Geochemistry and Zircon Hf Isotopic Compositions of the Ore-Bearing Porphyry in the Lakang'e Porphyry Cu-Mo Deposit, Tibet
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摘要: 拉抗俄Cu-Mo矿床是冈底斯成矿带东段典型的斑岩型矿床,前人对该矿床进行了初步的矿床地球化学研究,但欠缺系统性.在系统的野外地质调查基础上,对拉抗俄斑岩Cu-Mo矿床的含矿斑岩开展了详细的地球化学和年代学研究,旨在精确确定矿床含矿斑岩的成岩年龄、岩石成因及源区特征.岩石地球化学特征显示,含矿花岗闪长斑岩富硅,相对贫镁和钙,SiO2含量为62.51%~72.41%,MgO含量为0.59%~1.30%,CaO含量为0.95%~3.44%;碱含量高,Na2O含量为3.51%~4.75%,K2O含量为3.30%~4.97%;偏铝质或弱的过铝质,A/CNK比值为0.90~1.01;相对富集大离子亲石元素Rb、Ba、Th、U、Sr,明显亏损Nb、Ta、Ti、P、Zr等高场强元素.岩体稀土总量较低,为82.80×10-6~132.09×10-6;富集轻稀土,且轻重稀土分异明显;具有弱的Eu负异常和弱Ce负异常.采用LA-ICP-MS锆石U-Pb同位素测年技术对含矿花岗闪长斑岩进行定年,岩体成岩年龄为13.58±0.42 Ma,系中新世岩浆活动的产物.锆石εHf(t)值为-3.99~4.49,Hf同位素两阶段模式年龄tDM2为808~1 349 Ma.研究结果显示拉抗俄含矿花岗闪长斑岩具有埃达克岩地球化学特征,其岩浆源区主要来源于新生地壳部分熔融的组分,在岩浆侵位过程中遭受了古老地壳物质的混染,岩石形成于印度-亚洲大陆碰撞造山带的后碰撞伸展构造背景.Abstract: The Lakang'e Cu-Mo deposit is a typical porphyry deposit in the eastern Gangdese metallogenic belt, on which previous geochemical studies are not adequate and systematic.In this paper, we present the results of the systematic logging of drillholes and provide new petrological zircon U-Pb age, and Hf isotope data for the deposit that allow the identification of the timing of formation and mineralization of the Lakang'e porphyry Cu-Mo deposit and the relationship between this deposit and other porphyry-type deposits in the Gangdese belt.Chemical analyses show that the ore-bearing granodiorite-porphyry has high SiO2, low Mg and Ca (SiO2=62.51% to 72.41%, MgO=0.59% to 1.30%, CaO=0.95% to 3.44%), highalkaline (Na2O=3.51% to 4.75%, K2O=3.30% to 4.97%), metaluminous (A/CNK=0.90 to 1.01), enriched in LILES such as Rb, Ba, Th, U, Sr, and depleted in HFSES such as Nb, Ta, Ti, P and Zr. The rocks also display low total REEcontents (∑REE=82.80×10-6 to 132.09×10-6), enriched LREE and differentiate obviously, with weakly negative Eu and Ce anomalies. LA-ICP-MS zircon U-Pb dating indicates that the Lakang'e ore-bearing granodiorite-porphyry emplaced at 13.58±0.42 Ma. εHf(t) values and two-stage model ages of zircons are -3.99 to 4.49 and 808 to 1349 Ma respectively. The results indicate that the ore-bearing granodiorite-porphyry in the Lakang'e deposit has adakitegeochemical characteristics, and the parental magmas were mainly derived from a juvenile crust and partly mixed with old continental crust rock during the evolution. The porphyry in Lakang'edeposit was formed in post-collisional extension setting of India-Asia continental collision orogenic belt.
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Key words:
- geochemistry /
- zircon U-Pb dating /
- Hf isotopic compositions /
- Gangdese metallogenic belt /
- Tibet
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图 1 冈底斯成矿带地质简图及主要斑岩-矽卡岩矿床分布
矿床:1.汤不拉;2.亚贵拉;3.沙让;4.洞中拉;5.吹败子;6.弄如日;7.冲木达;8.蒙亚啊;9.哈海岗;10.甲玛;11.驱龙;12.拉抗俄;13.程巴;14.努日;15.克鲁;16.达布;17.厅宫;18.冲江;19.吉如;20.雄村;21.朱诺.SL.南冈底斯;CL.中冈底斯;NL.北冈底斯;BNSZ.班公湖-怒江缝合带;SNMZ.狮泉河-纳木错蛇绿混杂岩带;LMF.洛巴堆-米拉山断裂带;IYZSZ.印度河-雅鲁藏布江缝合带;底图据Zheng et al.(2014)修改
Fig. 1. Geological sketch of the Gangdese metallogenic belt showing the major ore deposit
图 7 拉抗俄含矿斑岩稀土元素配分曲线(a)和微量元素蛛网图(b)
a.球粒陨石数据,据Sun and McDonough (1989);b.原始地幔数据,据McDonough et al.(1992)
Fig. 7. Chondrite-normalized REE distribution patterns (a) and primitive mantle-normalized trace element spider diagrams (b) of the ore-bearing porphyry in Lakang'e deposit
图 8 拉抗俄含矿花岗闪长斑岩Sr/Y-Y(a)和(La/Yb)N-YbN(b)关系
Fig. 8. Relations of Sr/Y-Y (a) and (La/Yb)N-YbN (b) from the Lakang'e ore-bearing porphyry
图 9 拉抗俄含矿花岗闪长斑岩锆石U-Pb年龄-Hf同位素组成关系
驱龙数据杨志明(2008);甲玛数据引自应立娟,未刊资料;邦铺数据引自王立强,未刊资料;QL.驱龙;JM.甲玛;BP.邦铺;底图据侯增谦等(2012)
Fig. 9. Relations between U-Pb ages and Hf isotopic composition of zircons from the ore-bearing granodiorite-porphyry in Lakang'e deposit
图 10 拉抗俄含矿花岗闪长斑岩R1-R2构造环境判别关系
① 幔斜长花岗岩;② 破坏性活动板块边缘(板块碰撞前)花岗岩;③ 版块碰撞后隆起期花岗岩;④ 晚造期花岗岩;⑤ 非造山期A型花岗岩;⑥ 同碰撞(S型)花岗岩;⑦ 造山期后A型花岗岩.底图据Bachelor and Bowden(1985)
Fig. 10. R1-R2 factor diagram of the ore-bearing granodiorite-porphyry in Lakang'e deposit
表 1 拉抗俄矿床含矿花岗闪长斑岩LA-ICP-MS锆石U-Pb定年结果
Table 1. LA-ICP-MS zircon U-Pb analyses of the ore-bearing granodiorite-porphyry in Lakang'e deposit
分析点号 组成(10-6) Th/U 同位素比值 年龄(Ma) Th U 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 1 3 408.84 1 874.23 1.82 0.048 83 0.010 02 0.014 88 0.003 18 0.002 17 0.000 10 138.98 422.17 15.00 3.18 13.97 0.62 2 4 429.35 2 355.40 1.88 0.048 33 0.003 22 0.014 07 0.000 96 0.002 11 0.000 04 122.31 142.57 14.19 0.96 13.60 0.27 3 2 717.49 1 351.95 2.01 0.046 02 0.006 03 0.014 42 0.003 03 0.002 21 0.000 21 error 14.54 3.03 14.22 1.37 4 2 424.72 1 544.63 1.57 0.048 02 0.008 41 0.013 34 0.002 95 0.001 95 0.000 13 101.94 375.88 13.46 2.95 12.56 0.81 5 707.50 1 054.51 0.67 0.053 07 0.014 73 0.015 94 0.003 03 0.002 38 0.000 19 331.54 531.11 16.06 3.02 15.30 1.23 6 1 870.43 1 360.07 1.38 0.051 36 0.011 59 0.015 08 0.003 09 0.002 24 0.000 13 257.47 448.10 15.19 3.09 14.39 0.82 7 2 931.11 3 478.54 0.84 0.050 55 0.009 81 0.013 95 0.002 55 0.002 02 0.000 05 220.44 396.25 14.07 2.56 13.01 0.31 8 1 799.15 1 552.69 1.16 0.048 20 0.009 44 0.016 25 0.003 69 0.002 46 0.000 31 109.35 407.36 16.36 3.68 15.86 2.00 9 14 711.74 3 800.91 3.87 0.050 76 0.006 49 0.016 48 0.001 97 0.002 42 0.000 08 231.55 270.34 16.60 1.97 15.59 0.53 表 2 拉抗俄矿床含矿花岗闪长斑岩主量元素含量(%)、CIPW标准矿物及相关参数
Table 2. Major oxide compositions (%) with calculated CIPW-normative minerals and parameters of the ore-bearing granodiorite-porphyry in Lakang'e deposit
样品编号-深度(m) SiO2 Al2O3 Fe2O3 FeO MgO CaO Na2O K2O TiO2 MnO P2O5 烧失量 总量 / / / Q An Ab Or C Di Hy Ⅱ Mt Ap A/CNK A/NK SI AR AKI DI ZK201-26.8 67.40 14.61 0.97 3.07 1.03 1.90 4.56 3.30 0.34 0.060 0.14 2.01 99.39 / / / 21.62 8.72 39.60 20.05 0.44 / 7.13 0.66 1.44 0.34 1.01 1.32 7.97 2.82 0.76 81.27 ZK201-86.0 62.51 15.51 1.15 2.63 1.30 3.44 4.48 3.43 0.53 0.060 0.21 4.06 99.32 / / / 14.67 12.68 39.78 21.30 / 3.13 5.12 1.06 1.75 0.51 0.90 1.40 10.00 2.43 0.72 75.75 ZK201-47.8 66.45 14.96 0.84 2.71 1.12 1.99 4.72 3.45 0.39 0.050 0.16 2.64 99.48 / / / 19.23 9.10 41.20 21.08 0.24 / 6.74 0.77 1.25 0.39 0.99 1.30 8.72 2.86 0.77 81.51 ZK101-109.7 72.42 12.84 0.44 1.89 0.67 0.95 3.51 4.97 0.24 0.050 0.09 1.35 99.42 / / / 29.47 4.20 30.29 29.97 0.17 / 4.57 0.46 0.65 0.21 1.00 1.15 5.83 4.20 0.87 89.73 ZK101-140.2 71.92 13.33 0.65 1.87 0.68 1.06 3.67 4.92 0.24 0.040 0.10 1.06 99.54 / / / 27.98 4.70 31.53 29.55 0.27 / 4.33 0.47 0.95 0.23 1.00 1.17 5.77 3.96 0.85 89.06 ZK101-431.8 69.80 14.42 0.84 1.38 0.59 1.95 4.75 3.48 0.24 0.003 0.08 2.12 99.64 / / / 24.29 7.97 41.19 21.07 / 1.16 2.43 0.46 1.24 0.19 0.95 1.24 5.35 3.02 0.80 86.55 注:Q.石英;An.钙长石;Ab.钠长石;Or.钾长石;C.刚玉;Di.透辉石;Hy.紫苏辉石;Ⅱ.钛铁矿;Mt.磁铁矿;Ap.磷灰石;A/CNK=n(Al2O3)/[n(CaO)+n(Na2O)+n(K2O)];A/NK=n(Al2O3)/[n(Na2O)+n(K2O)];AKI=[n(Na2O)+n(K2O)]/n(Al2O3);SI.固结指数;AR.莱特碱度率;DI.分异指数. 表 3 拉抗俄矿床含矿花岗闪长斑岩微量及稀土元素含量(10-6)及相关参数
Table 3. Results of trace and REE compositions (10-6) and parameters of the ore-bearing granodiorite-porphyry in Lakang'e deposit
样品编号-深度(m) Rb Ba Th U K Ta Nb Sr Nd P Zr Hf Sm Ti Y Yb Lu / / / / / La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Y ∑REE LREE HREE LREE/HREE LaN/YbN Eu/Eu* Ce/Ce* ZK201-26.8 94 538 5.74 1.43 27 419 0.27 1.68 594 21.92 623 102 2.89 3.55 2034 5.62 0.49 0.08 / / / / / 23.79 40.88 5.08 21.92 3.55 1.06 2.42 0.27 1.11 0.20 0.61 0.08 0.49 0.08 5.62 101.54 96.28 5.26 18.31 34.68 1.05 0.87 ZK201-86.0 92 648 3.79 1.89 28 498 0.19 2.39 688 29.64 923 114 1.63 4.91 3195 4.92 0.44 0.06 / / / / / 23.44 48.23 6.54 29.64 4.91 1.34 3.26 0.34 1.25 0.21 0.58 0.07 0.44 0.06 4.92 120.32 114.10 6.22 18.35 38.66 0.96 0.94 ZK201-47.8 119 729 5.26 1.41 28 673 0.21 1.86 509 31.33 709 112 3.22 4.78 2347 6.09 0.53 0.08 / / / / / 30.10 50.96 7.36 31.33 4.78 1.19 3.14 0.34 1.30 0.24 0.66 0.08 0.53 0.08 6.09 132.09 125.73 6.36 19.77 41.05 0.88 0.81 ZK101-109.7 145 1416 8.49 2.41 41 291 0.13 1.29 392 18.70 397 89 1.30 2.90 1423 5.35 0.42 0.07 / / / / / 18.98 32.64 4.49 18.70 2.90 0.82 1.99 0.22 0.88 0.17 0.48 0.06 0.42 0.07 5.35 82.80 78.52 4.28 18.33 32.33 0.99 0.84 ZK101-140.2 132 737 7.11 2.09 40 876 0.11 1.11 483 18.44 422 94 2.78 2.84 1456 3.92 0.42 0.07 / / / / / 18.66 35.29 4.31 18.44 2.84 0.84 2.02 0.22 0.87 0.16 0.46 0.06 0.42 0.07 3.92 84.66 80.39 4.27 18.81 32.10 1.02 0.93 ZK101-431.8 82 602 7.58 2.16 28 864 0.13 1.25 548 20.70 357 113 3.27 3.09 1415 5.49 0.56 0.09 / / / / / 23.29 34.37 5.01 20.70 3.09 0.84 2.16 0.25 1.04 0.20 0.60 0.08 0.56 0.09 5.49 92.28 87.29 4.99 17.51 29.65 0.94 0.74 注:Eu/Eu*=2EuN/(SmN+GdN);Ce/Ce*=2CeN/(LaN+PrN). 表 4 拉抗俄矿床花岗闪长斑岩锆石Hf同位素组成
Table 4. Hf isotope composition of zircons from the ore-bearing granodiorite-porphyry in Lakang'e deposit
测点 年龄(Ma) 176Yb/177Hf 176Lu/177Hf 176Hf/177Hf 1σ 176Hf/177Hf(t) εHf(o) εHf(t) tDM1(Ma) tDM2(Ma) fLu/Hf 2 13.60 0.039 932 0.001 656 0.282 891 0.000 011 0.282 887 4.21 4.49 521 808 -0.95 3 14.22 0.019 518 0.000 852 0.282 777 0.000 014 0.282 955 0.16 0.47 672 1 065 -0.97 4 12.56 0.084 787 0.002 967 0.282 823 0.000 013 0.282 854 1.80 2.05 642 962 -0.91 5 15.30 0.016 333 0.000 734 0.282 650 0.004 367 0.259 309 -4.32 -3.99 848 1 349 -0.98 6 14.39 0.021 006 0.000 885 0.282 749 0.000 013 0.282 897 -0.83 -0.52 712 1 128 -0.97 7 13.01 0.020 204 0.000 919 0.282 738 0.000 011 0.282 975 -1.19 -0.91 727 1 152 -0.97 8 15.86 0.016 218 0.000 783 0.282 691 0.000 014 0.282 967 -2.88 -2.54 792 1 257 -0.98 注:εHf(t)=10 000{[(176Hf/177Hf)S-(176Lu/177Hf)S×(eλt-1)]/[(176Hf/177Hf)CHUR, 0-(176Lu/177Hf)CHUR×(eλt-1)]-1};tDM=1/λ×ln{1+[(176Hf/177Hf)S-(176Hf/177Hf)DM]/[(176Lu/177Hf)S-(176Lu/177Hf)DM]};tDMC=1/λ×ln{1+[(176Hf/177Hf)S, t-(176Hf/177Hf)DM, t]/[(176Lu/177Hf)C-(176Lu/177Hf)DM]}+t;球粒陨石及亏损地幔现在的176Hf/177Hf和176Lu/177Hf同位素比值分别为0.282 77和0.033 2,0.283 25和0.038 4,据Blichert-Toft and Albarède(1997)和 Griffin et al.(2000) ;λ=1.867×10-11 a-1,据Söderlund et al.(2004) ;(176Lu/177Hf)C=0.015,t.锆石结晶年龄;进行数据处理时,176Lu的衰变常数采用1.867×10-11 a-1,据Söderlund et al.(2004) ;εHf(t)值的计算利用Bouvier et al.(2008) 推荐的球粒陨石n(176Hf)/n(177Hf)比值(0.282 772) 及176Lu/177Hf比值(0.033 2);Hf模式年龄计算时采用当前亏损地幔的(176Hf)/(177Hf)比值(0.283 25) 和(176Lu)/(177Hf)比值(0.015) 及(176Lu)/(177Hf)比值(0.015),据Amelin et al.(1999) . -
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