ZIRCON U-PB AGES, GEOCHEMICAL CHARACTERISTICS AND TECTONICS IMPLICATIONS OF LATE JURASSIC INTERMEDIATE INTRUSIVE ROCKS IN SHIQUANHE AREA, WESTERN TIBET
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摘要: 侵位于狮泉河结合带南缘和结合带南侧古生代地层的晚白垩世侵入岩中，解体出一套中性侵入岩，呈岩珠、岩枝状产出，主要岩石类型为石英闪长岩、英云闪长岩和花岗闪长岩，其中石英闪长岩和英云闪长岩的LA-ICP-MS锆石U-Pb年龄为157.3±1.5 Ma（MSWD=0.96）和159.3±3.7 Ma（MSWD=2.30），指示岩浆活动时间为晚侏罗世牛津期。该岩体SiO2含量在59.65%~64.57%之间，K2O为1.95%~2.69%之间，Na2O为1.97%~3.42%，K2O/Na2O在0.74~1.29之间，P2O5为0.085%~0.139%之间，Al2O3为13.63%~15.68%之间，A/CNK为0.89~1.07，属于准铝质—弱过铝质花岗岩。岩石稀土元素总量（∑REE）为107.37×10-6~148.33×10-6，LREE/HREE在6.77~9.67之间，轻重稀土分异程度强，δEu为0.63~0.84，铕略具负异常；在原始地幔标准化蛛网图上，富Rb、Th等大离子亲石元素（LILE）而亏损Nb、Ta、Ti和P等高场强元素（HFSE），具有岛弧钙碱性岩浆的地球化学性质。从岩石学、岩石地球化学特征研究表明，该时期岩石显示同源岩浆演化的特征，具有典型I型花岗岩特征，形成于板块俯冲下的岛弧环境。表明狮泉河一带在晚侏罗世已经存在俯冲型花岗岩，研究认为该时期岩浆活动很可能是狮泉河洋盆北缘（北亚带）持续扩张时，向南缘（南亚带）及中冈底斯带北缘俯冲的产物。
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关键词:
- 狮泉河地区 /
- 中性侵入岩 /
- LA-ICP-MS锆石U-Pb /
- 晚侏罗世
Abstract: A set of intermediate intrusive rocks have been identified from a late Cretaceous pluton which intruded into the Paleozoic stratigraphy along the south of Shiquanhe belt, during the 1:50000 geological survey in the Gaer area. The intrusive rocks are exhibited as stock and apophyse, with the types of quartz diorite, tonalite and granodiorite. The zircon from quartz diorites and tonalites yield U-Pb ages of 157.3±1.5 (MSWD=0.96) and 159.3±3.7 Ma (MSWD=2.30) with LA-ICP-MS method, indicating late Jurassic magmatic activities. These intermediate-acid intrusive rocks have a SiO2 content of 59.65%~64.57%, K2O of 1.95%~2.54%, Na2O of 1.97%~2.54%, K2O/Na2O of 0.77%~1.29%, P2O5 of 0.085%~0.139%, Al2O3 of 13.63%~15.68% and A/CNK value of 0.89~1.04, which could belong to meta-aluminous rocks. The REE content of these rocks range from 107.37×10-6 to 148.33×10-6 with high grade fractionation of LREE/HREE (6.77~9.67) and some negative anomaly of Eu (0.63~0.84). Compared with the primitive mantle, all rocks are enriched in large ion lithophile elements (Rb and Th et al) and depleted in high field strength elements (Nb, Ta, Ti and P et al) with geochemical characteristics of the island arc calcalkaline magma. Petrological and geochemical characteristics indicate that the rocks have acidic rule of evolution, with the features of comagmatic evolution and typical I-type granite, and they were formed in the island arc environment with plate subduction. This research also indicates that subduction-type granite already existed in the Shiquanhe area during late Jurassic, and the magmatic activities were likely the product of subducted southward from Northern subzone in Shiquanhe area.-
Key words:
- Shiquanhe area /
- intermediate intrusive rocks /
- LA-ICP-MS zircon U-Pb /
- late Jurassic
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图 1 研究区地质简图
(据文献[7]修编)
Figure 1. Simplified geological map(according to regional geological survey of 1: 50000 in Gaer area, Tibet)
图 2 岩石宏观地质特征及显微矿物特征
a－为石英闪长岩宏观地质特征；b－为石英闪长岩显微矿物特征；c－为英云闪长岩宏观地质特征；d－为英云闪长岩显微矿物特征；e－为花岗闪长岩宏观地质特征；f－为花岗闪长岩显微矿物特征；Q－石英；P－斜长石；Am－角闪石
Figure 2. Field and photomicrographs of representative samples of the Shiquanhe area, Tibet
图 3 锆石阴极发光(CL)图像
Figure 3. Cathodoluminescence image of zircons from the Shiquanhe area
图 4 锆石U-Pb年龄谐和图
a－谐和图；b－加权平均年龄图
Figure 4. U-Pb Concordia diagrams of zircons from the granodirites in the Shiquanhe area
图 5 狮泉河地区中性侵入岩TAS分类图解
Figure 5. TAS classification diagram of the intermediate intrusive rocks in the Shiquanhe area
图 6 狮泉河地区中性侵入岩球粒陨石标准化稀土元素配分曲线图(a)和原始地幔标准化微量元素蛛网图(b)
(球粒陨石及原始地幔标准值据文献[19])
Figure 6. Chondrite-normalized REE patterns (a) and primitive mantle-normalized trace element spider diagrams (b) of the Shiquanhe intermediate intrusive rocks(Chonodrite values and primitive mantle after Sun and Donough, 1989)
图 7 狮泉河地区中性侵入岩P2O5-SiO2图解
Figure 7. P2O5-SiO2 diagram of the Shiquanhe intermediate intrusive rocks
图 8 狮泉河地区中性侵入岩K2O-SiO2图解
Figure 8. K2O-SiO2 diagram of the Shiquanhe intermediate intrusive rocks
图 9 狮泉河地区中性侵入岩Rb-Yb+Ta图解(a)和Yb-Ta图解(b)
(据Pearce et al.[23])
Figure 9. Rb vs.Yb+Ta diagram (a) and Yb vs.Ta diagram (b) of the Shiquanhe intermediate intrusive rocks
图 10 狮泉河地区中性侵入岩YbN-(La/Yb)N图解(a)和Y-Sr/Y图解(b)
(据Defant and Drummond，1990[25])
Figure 10. YbN vs. (La/Yb)N diagram (a) and Y vs. Sr/Y diagram (b) of the Shiquanhe intermediate intrusive rocks
(modified after Defant and Drummond, 1990)
图 11 狮泉河地区中性侵入岩La/Yb-La、La/Sm-La、Mg#-Ni及Cr-Ni图解
(图中俯冲板片熔融范围据Guan et al.[26]和张连昌等[27]；增厚下地壳熔融范围据Guan et al.[26]和Hou et al.[28])
Figure 11. Diagrams of La/Yb vs. La, La/Sm vs. La, Mg# vs. Ni, and Cr vs. Ni of the Shiquanhe intermediate intrusive rocks
(Field of subducted oceanic slab derived adakites is from Guan et al.(2012)[26]and Zhang et al.(2004)[27]; field of thickened lower crust derived adakites is from Guan et al.(2012)[26]and Hou et al.(2013)[28])
表 1 石英闪长岩(D3052)、英云闪长岩(D2087)LA-ICP-MS锆石U-Pb年代学分析结果
Table 1. LA-ICP-MS zircon U-Pb analysis results of quartz diorites(D3015)and tonalities(D2087)from the Shiquanhe area, Tibet
测点号 WB/10-6 Th/U 同位素比值 年龄/Ma Th U 207Pb/206Pb(1σ) 207Pb/235U(1σ) 206Pb/238U(1σ) 206Pb/238U(1σ) 207Pb/235U(1σ) 208Pb/232Th(1σ) D3052-01 120 145 0.83 0.0655(0.0056) 0.2131(0.0156) 0.0252(0.0006) 160(4) 196(13) 157(8) D3052-02 172 218 0.79 0.0579(0.0035) 0.1994(0.0121) 0.0249(0.0005) 158(3) 185(10) 168(13) D3052-03 182 192 0.95 0.0684(0.0059) 0.2394(0.0237) 0.0255(0.0005) 162(3) 218(19) 162(7) D3052-04 66.3 107 0.62 0.1216(0.0196) 0.4115(0.0720) 0.0246(0.0006) 157(4) 350(52) 166(13) D3052-05 126 160 0.79 0.0646(0.0057) 0.2144(0.0190) 0.0250(0.0005) 159(3) 197(16) 145(8) D3052-06 190 205 0.92 0.0499(0.0035) 0.1775(0.0129) 0.0256(0.0005) 163(3) 166(11) 178(34) D3052-07 117 142 0.83 0.0714(0.0055) 0.2293(0.0172) 0.0248(0.0006) 158(4) 210(14) 156(8) D3052-08 153 197 0.78 0.0662(0.0055) 0.2186(0.0174) 0.0245(0.0005) 156(3) 201(14) 147(7) D3052-09 156 190 0.82 0.0644(0.0046) 0.2190(0.0147) 0.0251(0.0005) 160(3) 201(12) 151(7) D3052-10 175 203 0.86 0.0559(0.0040) 0.1805(0.0119) 0.0239(0.0005) 152(3) 168(10) 141(6) D3052-11 168 212 0.79 0.1036(0.0396) 0.3467(0.1374) 0.0246(0.0005) 157(3) 302(104) 157(7) D3052-12 110 104 1.06 0.0915(0.0081) 0.2958(0.0246) 0.0244(0.0006) 155(4) 263(19) 159(9) D3052-13 115 147 0.78 0.0784(0.0065) 0.2467(0.0194) 0.0242(0.0006) 154(4) 224(16) 158(10) D3052-14 131 169 0.78 0.0692(0.0052) 0.2293(0.0157) 0.0250(0.0006) 159(4) 210(13) 148(8) D3052-15 137 170 0.80 0.0742(0.0064) 0.2449(0.0221) 0.0245(0.0005) 156(3) 222(18) 155(8) D3052-16 126 155 0.82 0.0690(0.0046) 0.2312(0.0154) 0.0241(0.0005) 154(3) 211(13) 178(9) D3052-17 115 120 0.96 0.0822(0.0057) 0.2797(0.0181) 0.0250(0.0006) 159(4) 250(14) 167(8) D3052-18 161 221 0.73 0.0887(0.0230) 0.3024(0.0805) 0.0244(0.0004) 155(3) 268(63) 160(7) D2087-08 167 224 0.74 0.0616(0.0039) 0.2211(0.0155) 0.0258(0.0006) 164(3) 203(13) 158(7) D2087-09 421 598 0.70 0.0614(0.0033) 0.2186(0.0123) 0.0255(0.0004) 162(2) 201(10) 187(9) D2087-11 129 176 0.73 0.0636(0.0051) 0.2017(0.0156) 0.0243(0.0005) 155(3) 187(13) 158(8) D2087-12 132 175 0.75 0.0600(0.0043) 0.1909(0.0125) 0.0244(0.0006) 156(4) 177(11) 147(7) D2087-13 166 201 0.83 0.1096(0.0089) 0.3746(0.0304) 0.0252(0.0006) 160(4) 323(22) 255(14) D2087-14 117 157 0.74 0.0728(0.0069) 0.2422(0.0198) 0.0256(0.0005) 163(3) 220(16) 158(9) D2087-15 235 496 0.47 0.0514(0.0031) 0.1768(0.0101) 0.0250(0.0004) 159(2) 165(9) 160(7) D2087-18 133 180 0.74 0.0612(0.0046) 0.2090(0.0153) 0.0255(0.0006) 163(3) 193(13) 161(8) 
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表 2 狮泉河地区中性侵入岩主量、微量和稀土元素分析结果及部分标准矿物特征参数
Table 2. Analysis results of major elements, REE, trace/elements, and characteristic parameters of some CIPW data of the Shiquanhe intermediate intrusive rocks
样品号 10-2 Mg# 10-2 SiO2 TiO2 Al2O3 Fe2O3 FeO MnO MgO CaO Na2O K2O P2O5 LOI 总和 Q An Ab D3052 62.21 0.55 14.32 1.31 4.39 0.12 4.7 4.94 2.15 2.3 0.096 2.68 99.77 60.07 21.62 23.31 18.74 D7206 61.58 0.57 13.63 0.83 5.26 0.13 5 5.17 1.97 2.54 0.103 2.96 99.74 59.74 19.92 21.54 17.22 D0016 62.05 0.54 15.25 1.01 4.3 0.11 3.69 5.76 2.18 2.1 0.1 2.66 99.75 55.81 22.01 26.39 19 D0017 64.57 0.43 15.2 1.06 3.17 0.08 3.16 5.36 2.3 2.46 0.085 1.9 99.78 57.74 24.82 24.4 19.88 D1070 59.65 0.62 15.6 1.12 5.01 0.12 4.58 5.66 2.38 2.12 0.139 2.72 99.72 57.57 16.55 26.41 20.76 D1086 62.04 0.54 14.88 1.34 4.16 0.12 3.92 4.56 2.66 2.44 0.11 3 99.77 56.57 20 22.17 23.26 D2045 60.56 0.59 15.68 0.88 5.31 0.14 3.56 6.28 2.02 2.2 0.104 2.46 99.77 51.00 19.36 27.97 17.56 D2087 61.23 0.56 15.37 1.18 4.88 0.14 3.77 3.4 3.42 2.52 0.12 3.17 99.77 53.08 16.35 16.62 29.96 D3262 62.42 0.56 14.57 0.22 5.2 0.12 4.57 4.26 2.54 1.95 0.105 3.28 99.79 60.15 21.34 21.19 22.27 D7214 63.75 0.49 14.32 1.05 3.86 0.1 3.77 5.26 2.08 2.51 0.098 2.48 99.77 58.31 24.22 22.95 18.09 D1281 63.83 0.48 14.77 0.81 4.11 0.11 4.08 3.65 2.57 2.69 0.1 2.57 99.77 60.04 22.75 17.94 22.37 样品号 10-2 A/CNK σ43 10-6 Or C Di Rb Ba Th U Ta Nb Sr Zr Hf Ni Cr La D3052 14 0 1.05 0.954 1 84.8 326 12.4 1.07 0.98 10.6 167 110 3.32 33 200 26 D7206 15.51 0 3.48 0.886 1.05 94.2 374 11.5 0.82 0.8 9.66 150 124 2.78 35.4 161 25.3 D0016 12.78 0 1.94 0.934 0.93 82.2 386 13.3 1.31 0.97 10.4 214 119 3.44 18.6 64.2 35.3 D0017 14.85 0 1.78 0.939 1.03 107 376 11.8 1.1 0.88 9.52 176 102 2.86 24.6 114 27.8 D1070 12.92 0 1.32 0.945 1.16 88.4 480 9.99 1.04 0.9 11 244 120 3.71 27.5 115 30 D1086 14.9 0 0.38 0.972 1.32 100 414 12.1 2.3 1.02 10.7 194 152 4.46 25.1 74.3 27 D2045 13.36 0 2.76 0.916 0.98 77.4 346 9.23 1.45 0.95 10.3 217 115 3.73 9.24 41.2 26.4 D2087 15.42 1.17 0 1.057 1.85 108 493 10.2 1.01 0.92 9.82 280 102 3.02 10.3 45.8 23.2 D3262 11.94 0.82 0 1.038 1 66.9 338 10 0.87 1 10.9 202 135 4.02 41.1 159 24.2 D7214 15.25 0 2.62 0.912 0.99 99.6 376 12.7 0.8 0.84 9.28 154 116 3.55 26 118 27.1 D1281 16.35 1.27 0 1.072 1.29 73.3 364 6.54 0.89 1.07 10.7 204 159 4.75 29.4 159 21.5 样品号 10-6 LREE/HREE δEu Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Y ∑REE D3052 52 5.99 21.8 4.14 0.94 4.18 0.76 3.59 0.79 2.53 0.42 2.3 0.37 26.3 125.81 7.42 0.68 D7206 51.6 5.7 20.4 3.97 0.89 3.93 0.72 4.2 0.85 2.58 0.41 2.5 0.46 23 123.51 6.89 0.68 D0016 63.4 6.67 23 4.27 1.03 4.27 0.76 3.46 0.76 2.44 0.4 2.21 0.36 27.3 148.33 9.12 0.73 D0017 50.2 5.19 17.5 3.1 0.86 3.1 0.54 2.54 0.56 1.84 0.3 1.67 0.27 20.3 115.47 9.67 0.84 D1070 58.8 6.7 24.6 4.62 1.12 4.6 0.82 3.81 0.86 2.68 0.46 2.39 0.4 29.2 141.86 7.86 0.73 D1086 51 5.81 21 4.16 0.93 4.05 0.72 3.36 0.73 2.36 0.4 2.14 0.34 25.4 124 7.79 0.68 D2045 52.2 6.16 22.9 4.46 1.05 4.57 0.83 3.98 0.87 2.86 0.49 2.62 0.42 29.5 129.81 6.8 0.7 D2087 44.7 5.23 19.2 4.05 1.03 4.05 0.78 3.68 0.8 2.62 0.44 2.39 0.39 26.8 112.56 6.43 0.77 D3262 48.1 5.92 21.8 4.37 0.9 4.22 0.79 3.73 0.81 2.69 0.44 2.48 0.4 27.1 120.85 6.77 0.63 D7214 52.0 5.53 18.9 3.54 0.88 3.54 0.61 3.71 0.76 2.4 0.36 2.36 0.39 21.1 122.08 7.64 0.75 D1281 42.4 5.18 19.2 3.91 0.96 3.79 0.73 3.47 0.76 2.44 0.41 2.25 0.37 23.2 107.37 6.55 0.75
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