Neoarchean Granitic Gneisses in the Kongling Complex, Yangtze Craton: Petrogenesis and Tectonic Implications
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摘要: 以崆岭杂岩中新太古代花岗片麻岩为研究对象,系统研究了其锆石U-Pb年代学和全岩地球化学特征,并对其岩石成因和扬子陆核~3.0~2.6 Ga构造演化过程进行了初步探讨.锆石LA-ICP-MS U-Pb同位素测年结果表明,花岗片麻岩形成年龄为2 673±39 Ma,且遭受了古元古代(2 042±27 Ma)的高压麻粒岩相变质作用.地球化学研究表明,该套花岗片麻岩富Si,贫Mg、Cr、Ni,具有Eu、Sr和高场强元素的负异常.花岗片麻岩的εNd(t)值在-1.9~-0.1之间变化,对应两阶段Nd同位素模式年龄为3.15~3.01 Ga,锆石饱和温度为789~825 ℃,显示岩体可能形成于初生长英质地壳物质在后碰撞伸展构造背景高温条件下部分熔融.结合前人已有的研究成果,认为以崆岭杂岩为代表的扬子陆核可能完整记录了~2.9~2.6 Ga板块俯冲-碰撞-后碰撞与造山作用相关的完整过程.Abstract: This study carries out systematical geochronological and whole-rock geochemical investigations for the Neoarchean granitic gneisses of the Kongling complex, and discusses the petrogenesis and~3.0-2.6 Ga tectonic evolution of the nucleus of the Yangtze craton. The zircon LA-ICP-MS U-Pb dating reveals that the gneisses were crystallized at 2 673±39 Ma, and experienced high-pressure granulite-facies metamorphism at 2 042±27 Ma. The geochemical study illustrates an enrichment of Si and depletions of Mg, Cr and Ni, as well as negative anomalies of high field strength elements, Eu and Sr. The εNd(t) values of the gneisses vary between -1.9 to -0.1 and the corresponding two-stage Nd isotopic model ages range from 3.15-3.01 Ga, combined with their relatively high calculated zircon saturation temperature (789-825℃), indicating that the Kongling Neoarchean gneisses might have formed by partial melting of juvenile felsic crustal materials under a high-temperature condition in the post-collisional extensional tectonic setting. Combined with the documented work, it is suggested that the nucleus of the Yangtze craton, represented by the Kongling complex, may fully record an~2.9-2.6 Ga orogenic-related event including earlier stage of oceanic slab subduction, middle stage of arc (or continent)-continent collision, and later stage of post-collisional extension.
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Key words:
- Neoarchean /
- granitic gneisses /
- Kongling complex /
- rock /
- tectonic implications
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图 1 崆岭地区地质简图及采样位置
Fig. 1. Sketch geological map of the study area in the Kongling region and sampling locations
图 5 崆岭地区新太古代花岗片麻岩锆石稀土元素配分模式图
球粒陨石标准化值据Sun and McDonough(1989)
Fig. 5. Chondrite-normalized REE patterns of zircons from the Kongling Neoarchean granitic gneisses
图 7 崆岭杂岩新太古代花岗片麻岩CIPW标准化三长石分类图
实验研究得到的部分熔体经Yang et al.(2016)修改
Fig. 7. CIPW-normative An-Ab-Or diagram for the Kongling Neoarchean granitic gneisses
图 8 崆岭杂岩新太古代花岗片麻岩(a)稀土元素配分模式图;(b)微量元素蛛网图
原始地幔归一化值据McDonough and Sun(1995);球粒陨石标准化值据Sun and McDonough(1989)
Fig. 8. (a) Chondrite-normalized rare earth element patterns and (b) primitive mantle-normalized spiderdiagram for the Kongling Neoarchean granitic gneisses
图 9 崆岭杂岩新太古代花岗片麻岩的(Nb+Y)-Rb构造判别图解
修改自Pearce et al.(1984);ORG.海洋山脊花岗岩; syn-COLG.syn-COLG花岗岩; VAG.火山弧花岗岩; WPG.板内花岗岩
Fig. 9. Rb versus (Nb+Y) diagram for the Kongling Neoarchean granitic gneisses
表 2 崆岭杂岩新太古代花岗片麻岩锆石稀土元素组成
Table 2. LA-ICP-MS REE (10-6) compositions of zircons crystals for the Kongling Neoarchean granitic gneisses
点号 La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu 12ZG-47-6 1.01 39.40 1.83 14.4 14.30 2.73 55.5 19.6 243.0 94.3 431.0 89.40 798.0 148.00 12ZG-47-7 0.28 23.20 0.37 3.56 9.05 2.43 56.8 20.1 241.0 91.0 407.0 83.60 775.0 160.00 12ZG-47-8 0.09 23.00 0.22 2.63 8.61 3.48 53.6 18.7 217.0 82.4 351.0 70.00 624.0 125.00 12ZG-47-10 0.01 38.90 0.08 1.55 5.71 0.52 42.8 17.5 225.0 91.4 425.0 89.90 840.0 164.00 12ZG-47-12 0.07 39.80 0.21 4.54 10.40 3.56 63.1 23.8 274.0 106.0 479.0 103.00 963.0 196.00 12ZG-47-13 0.06 12.00 0.22 2.54 5.92 2.21 35.5 12.3 131.0 46.1 192.0 38.70 355.0 71.40 12ZG-47-16 0.00 45.90 0.07 2.31 7.01 0.96 53.0 20.7 262.0 103.0 491.0 102.00 971.0 193.00 12ZG-47-18 0.00 11.80 0.09 2.52 6.86 2.36 42.5 13.9 154.0 54.3 226.0 46.20 418.0 84.40 12ZG-47-14 0.01 2.27 0.07 0.79 5.62 0.10 44.3 12.1 73.7 14.1 33.7 4.80 34.6 7.55 12ZG-47-11 0.00 1.86 0.08 1.65 13.80 0.32 97.5 25.7 130.0 18.3 32.7 4.07 22.7 3.49 12ZG-47-15 0.49 1.54 0.05 1.45 7.98 0.34 68.6 19.1 106.0 15.2 25.5 2.28 11.8 1.95 12ZG-47-19 0.11 3.03 0.17 1.68 9.09 0.67 63.5 18.3 128.0 25.5 67.1 8.64 59.0 10.10 12ZG-47-20 0.06 1.51 0.04 0.23 4.69 0.28 43.6 16.2 123.0 24.8 68.3 9.58 66.2 11.20 表 3 崆岭杂岩新太古代花岗片麻岩主量(%)及微量元素(10-6)组成
Table 3. Major (%) and trace element (10-6) compositions of the Kongling Neoarchean granitic gneisses
样品号 12ZG-47 12ZG-49 13SNJ111 13SNJ110 13SNJ104 13SNJ105 SiO2 72.97 72.35 70.99 71.68 71.00 71.67 TiO2 0.24 0.23 0.29 0.19 0.26 0.26 Al2O3 13.57 14.28 14.74 15.35 14.02 14.28 Fe2O3 3.60 3.12 3.78 2.10 2.95 3.42 MnO 0.03 0.03 0.06 0.02 0.03 0.03 MgO 0.65 0.73 0.78 0.41 0.39 0.37 CaO 0.77 1.49 1.36 1.28 1.43 1.03 Na2O 3.26 3.56 4.17 4.23 3.88 4.41 K2O 4.70 4.13 3.56 4.25 4.74 3.98 P2O5 0.04 0.03 0.05 0.13 0.06 0.07 LOI 0.02 -0.10 0.07 0.23 1.10 0.28 Total 99.84 99.84 99.85 99.85 99.86 99.80 Sc 4.56 4.75 5.89 3.60 2.19 2.32 V 8.94 12.5 13.9 8.17 14.9 19.3 Cr 33.7 12.7 13.9 11.8 25.0 16.6 Ni 6.67 15.6 4.59 3.92 5.81 4.85 Ga 46.6 46.1 19.4 22.5 23.1 24.7 Rb 130 86.8 83.8 108 119 68.0 Sr 214 204 376 247 243 289 Y 9.98 12.0 17.3 13.4 10.9 17.6 Zr 150 159 172 92.5 166 170 Nb 8.39 9.06 9.23 7.68 12.7 13.7 Cs 8.58 7.68 1.03 0.90 0.57 0.33 Ba 880 841 880 837 817 1 320 La 63.7 61.7 83.4 39.0 81.0 35.2 Ce 105 107 156 76.0 150 69.1 Pr 12.4 12.7 15.1 8.52 16.0 6.75 Nd 41.5 43.0 52.1 31.3 49.5 26.9 Sm 7.93 7.49 8.23 6.91 6.88 5.82 Eu 2.08 1.90 1.42 1.44 1.60 0.92 Gd 6.81 6.76 5.48 5.17 3.97 3.38 Tb 0.71 0.72 0.61 0.64 0.42 0.33 Dy 2.66 2.81 3.16 2.97 1.86 1.57 Ho 0.42 0.54 0.64 0.47 0.35 0.27 Er 1.05 1.59 1.74 1.01 0.90 0.71 Tm 0.16 0.23 0.26 0.14 0.11 0.10 Yb 0.94 1.49 1.70 0.76 0.77 0.60 Lu 0.13 0.19 0.24 0.11 0.12 0.09 Hf 5.00 5.26 5.59 2.68 5.82 6.06 Ta 0.55 0.73 0.67 0.50 0.96 1.03 Pb 46.2 15.9 47.0 42.9 22.9 24.6 Th 9.45 9.79 35.0 15.5 36.9 37.5 U 1.68 0.84 1.96 2.26 2.67 2.34 表 4 崆岭地区新太古代花岗片麻岩Sm-Nd同位素组成
Table 4. Sm-Nd isotopic compositions of the Kongling Neoarchean granitic gneisses
样品 Sm(10-6) Nd(10-6) 143Nd/144Nd 2εm(10-6) 147Sm/144Nd T2DM(Ga) εNd(t) 12ZG-43 8.486 50.24 0.510 970 5 0.102 2 3.01 -0.1 12ZG-47 7.592 42.52 0.511 012 3 0.108 0 3.10 -1.2 12ZG-49 7.227 45.34 0.510 775 5 0.096 4 3.15 -1.9 注:(1).Sm、Nd含量与147Sm/144Nd比值通过ID-TIMS法测量结果计算获得,误差 < 5‰;(2).计算εsub>Nd(t)值和T2DM年龄时,年龄值t采用锆石年龄2 673 Ma;T2DM计算过程中参数(147Sm/144Nd)DM=0.213 7、(144Nd/144Nd)DM=0.513 15、(147Sm/144Nd)CC=0.118 (DM、CC分别代表亏损地幔和大陆地壳),εsub>Nd(t)值计算过程中参数(147Sm/144Nd)CHUR=0.196 7、(143Nd/144Nd)CHUR=0.512 638. -
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