Geochemical characteristics of Late Triassic lamprophyres from the western Zhen'an, South Qinling and its indicative significance for tectonic environment
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摘要:
煌斑岩是反映深部构造-岩浆作用和源区地球化学性质的良好地质体。对南秦岭镇安西部地区出露的煌斑岩脉进行系统研究, 用LA-ICP-MS测定了煌斑岩中锆石U-Pb同位素, 得到其206Pb/238U年龄为222.2±1.2Ma(MSWD=0.38, n=15), 此年龄代表脉体的形成年龄, 属晚三叠世。地球化学分析表明, 岩石属钙碱性钾质-超钾质系列, 轻稀土元素和Rb、Ba等大离子亲石元素富集, 重稀土元素和Nb、Ti等高场强元素亏损, 具有俯冲带幔源岩石的成分特征; 岩石具有较高的(87Sr/86Sr)i值(0.7066~0.7076)和较低的εNd(t)值(-5.77~-4.62);锆石176Hf/177Hf值为0.28250~0.28287, εHf(t)值为-4.75~1.89, 锆石二阶段Hf模式年龄与全岩Nd二阶段模式年龄主要集中于中元古代(1.3~1.5Ga)。综合分析表明, 煌斑岩的源区为中元古代富集地幔, 形成于后碰撞伸展构造环境。在晚三叠世(220Ma左右)后碰撞伸展构造环境下, 勉略洋壳俯冲过程中形成的流体交代富集地幔在构造减压、深部物质上涌提供热和流体的共同作用下, 发生部分熔融, 形成具EMⅡ型同位素特征的镁铁质岩浆, 镁铁质岩浆沿后碰撞伸展阶段形成的裂隙上升侵位形成煌斑岩脉。
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关键词:
- 煌斑岩脉 /
- LA-ICP-MS锆石U-Pb年龄 /
- 地球化学 /
- Sr-Nd-Hf同位素 /
- 南秦岭
Abstract:The lamprophyres are good geological bodies reflecting deep tectonomagmatism and geochemical properties of source.In this paper, a systematic study has been carried out on the lamprophyre veins in the west of Zhen'an, South Qinling Mountains.Zircon U-Pb isotopes of the lamprophyre have been determined by LA-ICP-MS.The 206Pb/238U age of the lamprophyre is 222.2±1.2 Ma(MSWD=0.38, n=15), which represents the formation age of the vein body and belongs to the Late Triassic.Geochemical data show that the rocks belong to the calc-alkaline potassium-superpotassic series, enriched in LREE and large ion lithophile elements such as Rb and Ba, and deficient in HREE and high field strength elements such as Nb and Ti, which have the composition characteristics of mantle derived rocks in subduction zones.The isotopic compositions of the rocks are characterized by high initial(87Sr/86Sr)i rations(0.7066~0.7076)and negative εNd(t)values(-5.77~ -4.62);Furthermore, the 176Hf/177Hf rations of zircons range from 0.28250 to 0.28287, with εHf(t)values from -4.75 to 1.89, The two-stage Hf model ages(TDM2)and the whole-rock Nd isotopic model ages, are mainly concentrated in mesoproterozoic(1.3~1.5 Ga).Comprehensive analysis shows that the source of lamprophyre is Mesoproterozoic enriched mantle and formed in post-collision extensional tectonic environment.At the Late Triassic(approximately at 220 Ma), the enriched lithospheric mantle experienced metasomatism by subduction fluid, which occurred to partial melting under the conditions of tectonic decompression, heat and fluid from the upwelling deep materials, and produced mafic magma, the magma emplaced to shallow crust along tectonic fracture and formed the lamprophyres.
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Key words:
- lamprophyres /
- LA-ICP-MS zircon U-Pb dating /
- geochemistry /
- Sr-Nd-Hf isotopes /
- South Qinling Mountains
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表 1 南秦岭镇安西部煌斑岩LA-ICP-MS锆石U-Th-Pb同位素数据
Table 1. U-Th-Pb isotopic data of zircon in the lamprohyres from western Zhen'an, South Qinling, as measured by LA-ICP-MS
测点号 含量/10-6 Th/U 同位素比值 年龄/Ma Pb 232Th 238U 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 208Pb/232Th 1σ 206Pb/238U 1σ RZ1742-02 739 2377 1547 1.5 0.0619 0.0023 0.2965 0.013 0.0350 0.00067 0.0199 0.0010 221.7 4.2 RZ1742-04 132 538 1499 0.4 0.0503 0.0017 0.2424 0.008 0.0349 0.00032 0.0116 0.0005 221.4 2.0 RZ1742-05 816 2317 3327 0.7 0.0680 0.0023 0.3283 0.009 0.0352 0.00036 0.0212 0.0008 222.8 2.3 RZ1742-10 501 1996 2020 1.0 0.0765 0.0030 0.3686 0.014 0.0348 0.00036 0.0153 0.0010 220.7 2.3 RZ1742-11 1216 3875 2062 1.9 0.0799 0.0022 0.3916 0.010 0.0356 0.00033 0.0201 0.0008 225.4 2.0 RZ1742-12 897 2727 2109 1.3 0.0585 0.0019 0.2823 0.009 0.0350 0.00029 0.0209 0.0008 221.8 1.8 RZ1742-13 587 1516 3788 0.4 0.0614 0.0028 0.2944 0.009 0.0354 0.00053 0.0217 0.0009 224.3 3.3 RZ1742-14 223 1052 1418 0.7 0.0628 0.0020 0.3042 0.012 0.0349 0.00048 0.0122 0.0005 221.3 3.0 RZ1742-15 193 698 1655 0.4 0.0717 0.0021 0.3481 0.011 0.0350 0.00039 0.0146 0.0007 222.0 2.4 RZ1742-17 288 1269 1985 0.6 0.0623 0.0021 0.3012 0.010 0.0351 0.00035 0.0129 0.0007 222.4 2.2 RZ1742-18 1115 3410 2129 1.6 0.0699 0.0027 0.3367 0.012 0.0352 0.00039 0.0220 0.0011 222.8 2.4 RZ1742-19 300 1317 2263 0.6 0.0629 0.0021 0.3038 0.010 0.0351 0.00032 0.0129 0.0006 222.1 2.0 RZ1742-20 421 2090 1848 1.1 0.0717 0.0025 0.3426 0.012 0.0347 0.00033 0.0128 0.0007 219.6 2.1 RZ1742-24 720 2236 1464 1.5 0.0716 0.0028 0.3417 0.015 0.0352 0.00064 0.0208 0.0010 222.8 4.0 RZ1742-25 701 1884 2482 0.8 0.0804 0.0032 0.3893 0.016 0.0352 0.00044 0.0236 0.0013 222.8 2.7 
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表 2 南秦岭镇安西部煌斑岩主量、微量和稀土元素含量
Table 2. Major, trace elements and REE compositions of lamprohyres from western Zhen'an, South Qinling
样号 SiO2 TiO2 Al2O3 Fe2O3 FeO MnO MgO CaO Na2O K2O P2O5 烧失量 总计 K2O+Na2O K2O/Na2O Mg# TFe2O3 1742-1 51.05 0.805 11.25 2.4 3.23 0.0937 6.4 8.32 0.581 4.98 1.59 8.45 99.15 5.56 8.57 77.93 5.99 1742-3 56.23 0.653 10.38 2.25 3.2 0.0904 5.36 6.88 1.72 3.64 1.09 7.48 98.97 5.36 2.12 74.91 5.81 1742-4 53.52 0.607 10.65 3.36 2.42 0.0993 5.02 7.73 0.498 4.43 0.882 9.95 99.17 4.93 8.90 78.71 6.05 1742-5 52.89 0.744 11.38 2.45 2.93 0.0921 5.59 7.97 0.751 4.59 1.36 8.26 99.01 5.34 6.11 77.28 5.71 样号 Nb Zr Th U Ba Co Cr Ni Hf Rb Ta La Ce Pr Nd Sm Eu 1742-1 3.29 1354 17.3 7.47 3945 22.8 273 183 32.3 177 0.17 69.7 142 17.9 69.4 13.0 3.84 1742-3 4.34 670 13.9 4.11 1239 25.6 205 123 17.2 144 0.21 53.4 113 14.1 55.6 10.6 2.52 1742-4 3.82 1309 21.9 8.18 3158 23.5 139 85.5 31.6 144 0.20 75.3 153 18.9 72.5 13.3 3.68 1742-5 3.61 1411 17.5 7.30 3189 21.1 279 151 34.0 161 0.18 64.6 132 16.5 62.9 12.0 3.40 样号 Gd Tb Dy Ho Er Tm Yb Lu Y ∑REE LREE HREE LREE/HREE LaN/YbN LaN/SmN GdN/YbN δEu 1742-1 10.3 1.42 6.96 1.18 3.19 0.43 2.41 0.34 32.0 342.07 315.84 26.23 12.04 20.75 3.46 3.54 0.98 1742-3 8.55 1.28 6.40 1.13 3.02 0.43 2.34 0.35 28.9 272.72 249.22 23.50 10.61 16.37 3.25 3.02 0.78 1742-4 10.2 1.38 6.70 1.11 2.97 0.41 2.34 0.34 29.8 362.13 336.68 25.45 13.23 23.08 3.65 3.61 0.93 1742-5 9.52 1.36 6.48 1.17 3.04 0.42 2.55 0.33 30.3 316.27 291.40 24.87 11.72 18.17 3.48 3.09 0.94 注：Mg=100×Mg2+/(Mg2++ Fe2+)，TFe2O3=Fe2O3+1.111×FeO，δEu =EuN /(SmN + GdN)1/2；主量元素含量单位为%, 微量和稀土元素含量单位为10-6
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表 3 南秦岭镇安西部煌斑岩Sr-Nd同位素数据
Table 3. Sr-Nd isotopic results of lamprohyres from western Zhen'an, South Qinling
样品号 Rb /10-6 Sr/10-6 (87Sr/86Sr) ±2σ 87Rb/86Sr (87Sr/86Sr)i Sm /10-6 Nd /10-6 143Nd/144Nd ±2σ 147Sm/144Nd (143Nd/144Nd)i εNd(t) TDM2 /Ga 1742-1 177 720 0.708876 0.000010 0.71 0.70663 13.0 69.4 0.512281 0.000006 0.1140 0.512115 -4.62 1.38 1742-3 144 628 0.709141 0.000010 0.66 0.70705 10.6 55.6 0.512225 0.000006 0.1160 0.512056 -5.77 1.47 1742-4 144 1179 0.708715 0.000008 0.35 0.70760 13.3 72.5 0.512276 0.000006 0.1117 0.512114 -4.65 1.38 1742-5 161 624 0.708946 0.000008 0.75 0.70659 12.0 62.9 0.512275 0.000005 0.1161 0.512106 -4.80 1.39 注：εNd(t)= {[(143Nd/144Nd)样品-(147Sm/144Nd)样品×(eλt -1)]/[(143Nd/144Nd)CHUR-(147Sm/144Nd)CHUR×(eλt -1)-1]}×10000; TDM=(1/ λ)×ln {1+[(143Nd/144Nd)样品-(143Nd/144Nd)亏损地幔]/[(147Sm/144Nd)样品-(147Sm /144Nd)亏损地幔]}; (143Nd/144Nd)CHUR=0.512638，(147Sm/144Nd)CHUR=0.1967，(143Nd/144Nd)亏损地幔=0.51315，(147Sm /144Nd)亏损地幔=0.2137
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表 4 南秦岭镇安西部煌斑岩锆石Lu-Hf同位素数据
Table 4. Zircon Lu-Hf isotopic results of lamprohyres from western Zhen'an, South Qinling
测点号 176Yb/177Hf 2σ 176Lu/177Hf 2σ 176Hf/177Hf 2σ 206Pb/238U/Ma (176Hf/177Hf)i εHf(0) εHf(t) TDM1 /Ga TDM2 /Ga fLu/Hf 1742-02 0.03738 0.00040 0.00110 0.000010 0.28260 0.000039 221.7 0.282591 -6.25 -1.54 0.93 1.35 -0.97 1742-04 0.01466 0.00012 0.00043 0.000003 0.28260 0.000043 221.4 0.282597 -6.12 -1.32 0.91 1.34 -0.99 1742-05 0.02554 0.00043 0.00079 0.000012 0.28266 0.000025 222.7 0.282660 -3.84 0.94 0.83 1.20 -0.98 1742-10 0.03345 0.00011 0.00107 0.000006 0.28265 0.000017 220.7 0.282648 -4.24 0.45 0.85 1.23 -0.97 1742-11 0.02177 0.00023 0.00071 0.000006 0.28250 0.000065 225.4 0.282498 -9.59 -4.74 1.05 1.56 -0.98 1742-12 0.06097 0.00046 0.00155 0.000006 0.28269 0.000033 221.8 0.282688 -2.75 1.89 0.80 1.14 -0.95 1742-13 0.00727 0.00004 0.00019 0.000001 0.28253 0.000021 224.3 0.282527 -8.63 -3.73 1.00 1.49 -0.99 1742-14 0.03868 0.00046 0.00131 0.000013 0.28263 0.000029 221.3 0.282628 -4.89 -0.22 0.88 1.27 -0.96 1742-15 0.00843 0.00008 0.00030 0.000002 0.28257 0.000018 222.0 0.282568 -7.16 -2.33 0.95 1.40 -0.99 1742-17 0.01063 0.00007 0.00034 0.000002 0.28258 0.000020 222.3 0.282577 -6.85 -2.01 0.94 1.38 -0.99 1742-18 0.01278 0.00007 0.00042 0.000003 0.28258 0.000022 222.7 0.282583 -6.63 -1.80 0.93 1.37 -0.99 1742-19 0.01617 0.00005 0.00050 0.000002 0.28252 0.000037 222.1 0.282515 -9.00 -4.20 1.03 1.52 -0.99 1742-20 0.03132 0.00009 0.00112 0.000002 0.28260 0.000021 219.6 0.282597 -6.02 -1.36 0.92 1.34 -0.97 注：εHf(t)={[(176Hf/177Hf)s -(176Lu/177Hf)s ×(eλt -1)]/[(176Hf/177Hf)CHUR, 0 -(176Lu/177Hf)CHUR, 0×(eλt -1)]-1 }×10000; TDM1=(1/ λ)×ln {1+[(176Hf / 177Hf)s -(176Hf/177Hf)DM]/[(176Lu / 177Hf)s -(176Lu/177Hf)DM]}; TDM2=t+(1/ λ)×ln {1+[(176Hf / 177Hf)s , t-(176Hf/177Hf)DM, t]/[(176Lu / 177Hf)c -(176Lu/177Hf)DM]} ; fLu/Hf =(176Lu/177Hf)s /(176Lu/177Hf)CHUR, 0-1; 其中(176Lu/177Hf)s和(176Hf/177Hf)s为样品测定值，(176Lu/177Hf)CHUR, 0=0.0332, (176Hf/177Hf)CHUR, 0=0.282772, (176Lu/177Hf)DM =0.0384，(176Hf/177Hf)DM=0.28325，(176Lu/177Hf)c =0.015, λ=1.867×10-11/a，t为锆石结晶年龄
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① 陕西省矿产地质调查中心. 镇安西部金铜钨多金属找矿会战区地质矿产图, 2020.
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