Confirmation of Aluminous A-Type Granite Emplacement and Its Tectonic Significance during Early Cretaceous in the Laoling Area, South of Jilin Province
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摘要: 主微量元素分析和LA-ICP-MS锆石U-Pb年龄显示吉南老岭地区的头道、老岭、上绿水桥和高台子岩体为一套早白垩世铝质A型花岗岩.主要岩性为钾长花岗岩、晶洞钾长花岗岩、花岗斑岩和花岗岩.LA-ICP-MS锆石U-Pb年龄为121~125Ma.主量元素具有富Si、alk, 贫Fe、Mg、Ca、Ti的特征; 微量元素亏损Ba、Sr、Ti、Nb、Ta、P, 富集K、Rb、Th等不相容元素; 稀土元素具有中等到强烈的负铕异常及右倾海鸥型的球粒陨石标准化稀土配分模式.元素地球化学特征表明岩体为铝质A型花岗岩(A/CNK=0.82~1.15, A/NK=1.00~1.28).岩石具有较低的不相容元素Ce/Nb、Y/Nb、Yb/Ta比值, 为A1型非造山花岗岩.研究表明吉南老岭地区早白垩世时处于非造山的伸展构造环境, 是华北板块东部早白垩世伸展地球动力学背景在吉林南部地区的岩浆活动体现.Abstract: Major and trace elements analysis and LA-ICP-MS zircon U-Pb ages show Toudao, Laoling, Shanglvshuiqiao and Gaotaizi plutons are Early Cretaceous aluminum A-type granites in the Laoling area, South of Jilin Province.Plutons mainly consist of k-feldspar granite, miarolitic k-feldspar granite, granite porphyry and granites.The results of LA-ICP-MS dating are (121-125) Ma.The major elements of granitoids are high in Si, alk and low in Fe, Mg, Ca, and Ti.Trace elements are enriched in incompatible elements such as K, Rb, Th and depleted in Ba, Sr, Ti, Nb, Ta, and P.The granitoids have right-wing type of chondrite-normalized REE patterns and moderate negative Eu anomalies.Geochemical features indicate that granitoids are aluminum A-type granites (A/CNK=(0.82-1.15), A/NK=(1.00-1.28)).Granitoids with relatively low incompatible element ratio values such as Ce/Nb, Y/Nb and Yb/Ta are A1-type anorogenic granite.The formation of A1-type granite indicates Laoling area is in the Anorogenic extensional tectonic setting during Early Cretaceous.
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图 6 球粒陨石标准化配分模式(据Sun and McDonough, 1989)
Fig. 6. Chondrite-normalized REE pattern of granite
图 7 原始地幔标准化蛛网图(据Sun and McDonough, 1989)
Fig. 7. Primitive mantle-normalized spider diagram
表 1 花岗岩体LA-ICP-MS锆石U-Pb年龄数据
Table 1. LA-ICP-MS U-Pb ziron age data for granite plutons
232Th(10-6) 238U(10-6) 232Th/238U 比值(±1σ/100) 年龄(Ma) 207Pb/206Pb 207Pb/235U 206Pb/238U 207Pb/206Pb 207Pb/235U 206Pb/238U 高台子岩体 J0101 235.63 256.22 0.92 0.0524±0.29 0.1375±0.80 0.0193±0.03 305±103 131±7 123±2 J0102 865.46 753.76 1.15 0.0496±0.19 0.1340±0.51 0.0196±0.02 174±69 128±5 125±1 J0103 195.85 292.64 0.67 0.0521±0.31 0.1337±0.78 0.0190±0.03 290±105 127±7 121±2 J0104 252.39 229.99 1.10 0.0529±0.35 0.1397±0.97 0.0194±0.03 323±128 133±9 124±2 J0105 218.55 266.23 0.82 0.0545±0.41 0.1393±0.88 0.0194±0.03 390±113 132±8 124±2 J0106 262.80 243.69 1.08 0.0540±0.36 0.1454±0.91 0.0199±0.04 373±109 138±8 127±2 J0107 160.46 150.60 1.07 0.0536±0.42 0.1432±1.07 0.0194±0.04 353±131 136±9 124±3 J0108 327.47 480.12 0.68 0.0506±0.25 0.1332±0.64 0.0192±0.02 221±92 127±6 122±1 J0109 504.20 370.11 1.36 0.0481±0.25 0.1293±0.69 0.0195±0.03 103±94 123±6 125±2 J0110 391.05 422.81 0.92 0.0501±0.25 0.1306±0.64 0.0192±0.03 202±88 125±6 122±2 J0111 369.57 471.75 0.78 0.0523±0.24 0.1393±0.63 0.0196±0.03 298±76 132±6 125±2 J0112 251.56 381.66 0.66 0.0509±0.28 0.1367±0.75 0.0196±0.03 236±99 130±7 125±2 J0113 331.41 305.91 1.08 0.0525±0.32 0.1403±0.77 0.0198±0.03 305±98 133±7 127±2 J0114 296.56 248.26 1.19 0.0518±0.36 0.1344±0.85 0.0193±0.03 276±115 128±8 123±2 J0115 220.19 375.18 0.59 0.0533±0.27 0.1413±0.68 0.0196±0.03 342±81 134±6 125±2 J0116 311.20 263.48 1.18 0.0531±0.33 0.1440±0.83 0.0202±0.04 334±96 137±7 129±2 J0117 378.96 352.29 1.08 0.0502±0.27 0.1321±0.71 0.0193±0.02 203±101 126±6 123±2 J0118 520.12 415.98 1.25 0.0471±0.25 0.1233±0.64 0.0191±0.03 52±86 118±6 122±2 老岭岩体 J601 644.75 632.75 1.02 0.0495±0.21 0.1244±0.51 0.0184±0.02 169±72 119±5 118±2 J602 570.54 555.11 1.03 0.0520±0.51 0.1358±1.32 0.0190±0.03 284±226 129±12 121±2 J603 233.35 373.78 0.62 0.0455±0.23 0.1199±0.59 0.0192±0.03 -28±80 115±5 122±2 J604 268.74 330.25 0.81 0.0520±0.34 0.1358±0.88 0.0190±0.03 285±118 129±8 121±2 J605 252.23 258.41 0.98 0.0534±0.36 0.1391±0.99 0.0189±0.03 346±131 132±9 121±2 J606 256.31 414.44 0.62 0.0510±0.23 0.1389±0.63 0.0198±0.03 241±80 132±6 126±2 J607 395.29 503.93 0.78 0.0519±0.26 0.1356±0.66 0.0189±0.02 279±91 129±6 121±1 J608 656.24 865.98 0.76 0.0508±0.20 0.1340±0.49 0.0192±0.02 232±66 128±4 123±1 J609 1851.23 1871.05 0.99 0.0511±0.12 0.1394±0.34 0.0197±0.02 243±40 133±3 126±1 J610 389.94 434.42 0.90 0.0495±0.23 0.1288±0.57 0.0192±0.02 171±81 123±5 122±1 J611 800.14 763.92 1.05 0.0505±0.17 0.1313±0.42 0.0188±0.02 219±56 125±4 120±1 J612 175.59 227.65 0.77 0.0508±0.28 0.1320±0.71 0.0190±0.03 230±99 126±6 121±2 J613 291.73 448.92 0.65 0.0516±0.21 0.1376±0.55 0.0194±0.02 269±71 131±5 124±1 J614 1384.59 955.47 1.45 0.0525±0.17 0.1387±0.46 0.0191±0.02 307±59 132±4 122±1 J615 420.63 483.81 0.87 0.0546±0.28 0.1435±0.66 0.0194±0.03 396±80 136±6 124±2 J616 272.25 366.69 0.74 0.0456±0.20 0.1222±0.54 0.0194±0.02 -22±70 117±5 124±1 J617 430.03 616.61 0.70 0.0526±0.29 0.1374±0.72 0.0191±0.03 312±93 131±6 122±2 上绿水桥岩体 J401 380.37 291.33 1.31 0.0499±0.62 0.1294±1.59 0.0188±0.05 192±227 124±14 120±3 J402 1389.61 792.00 1.75 0.0517±0.21 0.1368±0.57 0.0193±0.02 270±76 130±5 123±1 J403 1588.40 940.64 1.69 0.0525±0.18 0.1392±0.49 0.0191±0.02 307±61 132±4 122±1 J404 1492.81 824.62 1.81 0.0528±0.31 0.1365±0.77 0.0188±0.03 319±99 130±7 120±2 J405 434.89 365.83 1.19 0.0538±0.30 0.1424±0.74 0.0196±0.03 364±90 135±7 125±2 J406 1268.11 1066.46 1.19 0.0544±0.62 0.1448±1.58 0.0194±0.07 389±181 137±14 124±4 J407 851.72 637.78 1.34 0.0533±0.27 0.1409±0.75 0.0190±0.03 341±96 134±7 121±2 J408 491.97 661.81 0.74 0.0447±0.32 0.1148±0.78 0.0189±0.03 -35±113 110±7 120±2 J409 794.06 781.38 1.02 0.0516±0.21 0.1338±0.52 0.0190±0.02 267±68 128±5 121±1 J410 528.91 465.62 1.14 0.0513±0.25 0.1331±0.65 0.0189±0.02 252±91 127±6 121±1 J411 631.04 626.82 1.01 0.0488±0.21 0.1258±0.49 0.0189±0.02 139±71 120±4 120±1 头道岩体 2201 165.28 279.05 0.59 0.0487±0.33 0.1268±0.83 0.0189±0.03 133±152 121±7 121±2 2202 172.54 280.60 0.61 0.0539±0.34 0.1483±0.86 0.0203±0.03 366±107 140±8 130±2 2203 105.47 129.05 0.82 0.0473±0.52 0.1265±1.41 0.0194±0.06 64±190 121±13 124±4 2204 162.14 228.92 0.71 0.0546±0.35 0.1413±0.83 0.0192±0.03 395±105 134±7 123±2 2205 27.11 50.64 0.54 0.0540±0.48 0.1233±0.29 0.0183±0.13 370±119 118±3 117±8 2206 149.83 280.93 0.53 0.0548±0.41 0.1375±0.87 0.0189±0.04 404±104 131±8 121±3 2207 164.35 218.24 0.75 0.0494±0.28 0.1316±0.76 0.0194±0.03 166±107 126±7 124±2 2208 212.35 275.63 0.77 0.0483±0.43 0.1304±1.11 0.0196±0.05 111±199 124±10 125±3 2209 184.28 299.49 0.62 0.0527±0.30 0.1431±0.82 0.0197±0.03 317±107 136±7 126±2 2210 90.33 175.38 0.52 0.0533±0.39 0.1479±1.01 0.0204±0.04 339±124 140±9 130±2 2211 257.83 324.07 0.80 0.0535±0.30 0.1437±0.83 0.0195±0.02 348±110 136±7 125±1 2212 161.96 215.67 0.75 0.0495±0.27 0.1304±0.68 0.0193±0.03 171±94 124±6 123±2 2213 140.82 278.80 0.51 0.0522±0.35 0.1428±0.93 0.0199±0.03 295±119 136±8 127±2 2214 167.96 223.25 0.75 0.0512±0.30 0.1436±0.85 0.0203±0.03 251±109 136±8 129±2 2215 262.09 268.88 0.97 0.0517±0.26 0.1387±0.68 0.0196±0.03 271±88 132±6 125±2 2216 123.64 148.17 0.83 0.0522±0.59 0.1327±1.5 0.0188±0.04 294±217 126±13 120±2 2217 98.91 163.90 0.60 0.0469±0.79 0.1231±2.08 0.0192±0.08 43±255 118±19 123±5 2218 305.14 239.69 1.27 0.0535±0.36 0.1477±0.97 0.0200±0.04 349±116 140±9 128±2 表 2 花岗岩体常量元素含量(%)
Table 2. Major element values of granite plutons
SiO2 TiO2 Al2O3 TFe2O3 MnO MgO CaO Na2O K2O P2O5 A/CNK A/NK K2O/Na2O TFeO/MgO 高台子岩体 J002-2 74.41 0.10 12.66 2.15 0.05 0.35 0.87 3.78 5.15 0.07 0.95 1.07 1.36 5.53 J002-3 74.80 0.10 13.63 1.78 0.05 0.33 0.67 3.93 4.35 0.07 1.10 1.22 1.11 4.85 J001-1 71.60 0.24 13.92 2.58 0.09 0.49 0.54 4.32 4.80 0.05 1.05 1.13 1.11 4.74 J005-2 74.54 0.20 11.91 1.96 0.03 0.60 1.77 3.53 5.13 0.03 0.82 1.05 1.45 2.94 J005-6 75.96 0.10 12.17 1.68 0.05 0.29 0.78 3.55 5.07 0.03 0.95 1.07 1.43 5.21 上绿水桥岩体 J004-4 76.34 0 12.52 1.37 0.03 0.03 0.21 3.32 5.16 0.03 1.10 1.13 1.55 41.09 J004-5 76.30 0.04 12.50 1.47 0.03 0.02 0.15 3.31 5.20 0.05 1.10 1.13 1.57 66.14 J004-8 75.98 0.02 11.83 1.76 0.07 0.04 0.36 3.49 5.14 0.03 0.99 1.05 1.47 39.59 J004-9 75.94 0 12.43 1.44 0.03 0.03 0.56 3.09 5.20 0.04 1.06 1.16 1.68 43.19 老岭岩体 J006-1 75.54 0 12.14 1.58 0.04 0.04 0.52 3.95 5.14 0.04 0.93 1.01 1.30 35.54 J008-1 74.70 0.02 12.03 1.83 0.06 0.04 0.49 3.64 5.55 0.04 0.93 1.00 1.52 41.17 J009-1 74.52 0.10 13.53 2.43 0.03 0.17 0.44 3.70 4.43 0.04 1.16 1.24 1.20 12.86 J011-3 75.30 0.02 12.32 1.48 0.04 0.08 0.40 3.46 5.64 0.05 0.98 1.04 1.63 16.65 J011-5 75.50 0.04 12.40 1.56 0.03 0.08 0.37 3.25 5.91 0.04 1.00 1.06 1.82 17.55 头道岩体 J022-3 74.24 0.16 12.62 2.32 0.05 0.31 0.26 4.11 5.28 0.03 0.97 1.01 1.28 6.73 J022-5 75.32 0.16 12.71 1.38 0.04 0.25 0.65 3.51 4.64 0.04 1.06 1.18 1.32 4.97 J022-7 74.26 0.16 12.62 2.38 0.05 0.29 0.22 3.70 5.19 0.05 1.04 1.08 1.40 7.38 J022-9 74.56 0.12 12.64 2.18 0.04 0.25 0.22 3.46 5.19 0.04 1.08 1.12 1.50 7.85 J022-13 74.02 0.12 13.40 1.67 0.05 0.26 0.36 3.97 4.92 0.05 1.07 1.13 1.24 5.78 表 3 花岗岩体稀土微量元素含量(10-6)
Table 3. Trace elements and rare earth elements values of granite plutons
稀土元素 La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu ∑REE 高台子岩体 J002-2 28.83 50.13 5.59 17.75 2.84 0.52 2.41 0.40 2.32 0.44 1.32 0.25 1.63 0.26 114.69 J002-3 34.68 62.98 6.47 19.72 2.99 0.53 2.52 0.38 2.24 0.44 1.34 0.25 1.66 0.26 136.44 J001-1 36.30 71.03 7.27 23.21 3.86 0.64 3.31 0.52 3.03 0.57 1.66 0.30 1.88 0.28 153.84 J005-2 31.43 55.65 5.86 18.44 3.10 0.50 2.73 0.44 2.64 0.51 1.56 0.28 1.85 0.28 125.26 J005-6 24.36 40.32 4.72 15.06 2.77 0.43 2.46 0.42 2.50 0.47 1.42 0.26 1.67 0.24 97.09 上绿水桥岩体 J004-4 24.62 70.83 6.16 21.35 4.16 0.06 3.82 0.64 3.81 0.72 2.07 0.36 2.19 0.30 141.08 J004-5 22.87 66.58 5.60 18.91 3.53 0.06 3.08 0.51 3.02 0.56 1.64 0.27 1.68 0.24 128.55 J004-8 28.28 81.55 6.64 22.24 4.07 0.06 3.72 0.65 3.83 0.73 2.17 0.37 2.24 0.32 156.86 J004-9 16.35 50.81 4.34 15.47 3.16 0.06 3.00 0.54 3.20 0.61 1.84 0.31 1.94 0.28 101.90 老岭岩体 J006-1 40.52 96.36 8.91 30.46 5.36 0.23 4.65 0.74 4.14 0.74 2.10 0.34 2.08 0.29 196.93 J008-1 38.63 84.64 8.77 30.67 5.68 0.23 5.08 0.85 4.94 0.92 2.57 0.43 2.6 0.37 186.37 J009-1 46.11 78.45 10.34 36.19 6.90 0.58 6.41 1.05 6.00 1.10 3.10 0.51 3.15 0.44 200.34 J011-3 22.16 41.80 4.67 15.71 3.26 0.24 3.18 0.54 3.12 0.60 1.74 0.29 1.78 0.27 99.38 J011-5 28.09 46.82 5.89 19.42 3.89 0.29 3.95 0.71 4.35 0.80 2.47 0.43 2.74 0.41 120.24 头道岩体 J022-13 17.25 84.20 3.98 13.28 2.49 0.20 2.18 0.38 2.20 0.41 1.22 0.20 1.20 0.17 129.37 J022-3 33.24 103.70 6.84 22.34 3.66 0.3 3.34 0.55 3.23 0.61 1.76 0.28 1.77 0.23 181.85 J022-5 31.07 97.87 6.88 23.05 4.05 0.29 3.54 0.56 3.22 0.57 1.63 0.27 1.63 0.23 174.85 J022-7 36.46 98.93 8.09 26.72 4.83 0.33 4.05 0.63 3.49 0.63 1.78 0.28 1.69 0.24 188.16 J022-9 23.50 72.32 6.31 21.90 4.37 0.33 3.83 0.70 4.23 0.80 2.37 0.39 2.61 0.37 144.04 微量元素 Be V Cr Ga Rb Sr Y Zr Nb Cs Ba Hf Ta Th U 高台子岩体 J002-2 1.71 13.35 3.44 26.69 133.5 158.1 13.61 154.90 12.41 1.55 889.4 5.44 1.92 16.81 1.93 J002-3 1.56 13.00 2.74 26.15 136.9 162.8 13.97 147.60 11.88 1.54 863.7 4.81 1.41 16.48 1.94 J001-1 2.12 9.76 1.54 27.51 153.4 184.8 16.11 204.80 15.63 1.85 893.5 6.28 1.41 17.81 3.11 J005-2 1.90 9.30 1.93 24.76 152.1 133.4 15.15 132.80 13.04 1.28 832.5 4.79 1.45 18.06 3.16 J005-6 1.78 8.63 1.74 23.31 134.8 120.2 14.37 92.09 12.87 1.08 798.4 3.56 1.47 15.66 2.83 上绿水桥岩体 J004-4 4.28 0.48 0.65 10.65 204.1 6.98 18.44 198.60 23.17 2.54 26.07 8.37 1.82 19.69 5.48 J004-5 3.62 0.40 0.58 10.22 196.4 6.75 14.71 165.10 22.89 2.63 27.16 6.92 1.75 17.48 4.63 J004-8 3.18 0.48 2.15 10.50 204.8 6.65 19.88 175.20 23.92 2.66 24.64 7.37 1.73 18.35 4.82 J004-9 3.99 0.71 2.69 10.22 187.5 7.26 17.22 150.80 21.35 2.40 23.25 6.47 1.65 16.75 4.77 老岭岩体 J006-1 3.44 0.55 0.79 12.34 180.5 9.11 19.95 189.70 19.82 1.81 124.0 7.31 1.50 18.81 4.28 J008-1 3.73 0.58 0.95 14.10 169.2 18.92 24.23 198.40 19.93 1.92 117.6 7.3 1.52 17.09 4.29 J009-1 2.60 5.96 1.38 24.97 137.9 99.93 30.60 234.90 22.98 2.21 590.7 7.65 1.67 15.24 2.37 J011-3 2.57 2.51 1.47 15.95 190.1 67.81 17.02 98.88 20.70 2.46 364.8 3.99 2.13 16.67 5.06 J011-5 2.43 2.70 0.80 18.67 191.7 76.88 26.06 94.67 20.84 2.51 410.5 3.97 2.25 19.24 5.10 头道岩体 J022-13 3.28 7.07 2.32 16.45 139.0 66.83 9.90 276.50 27.00 2.79 305.4 8.79 2.44 17.00 3.82 J022-3 4.42 9.00 1.39 18.15 170.4 93.66 14.53 369.20 35.83 3.93 340.6 11.07 2.88 19.70 4.16 J022-5 3.85 7.78 2.13 18.53 140.1 87.04 13.89 278.30 29.30 2.56 340.8 8.85 2.48 20.20 4.03 J022-7 3.56 7.40 1.85 18.39 141.0 82.88 15.57 272.70 28.25 2.65 348.8 8.48 2.44 19.99 3.69 J022-9 3.61 6.98 1.94 24.04 121.1 84.74 19.10 148.50 28.74 2.45 367.6 5.57 2.42 16.19 3.29 -
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