Petrogenesis and Tectonic Setting of the Shaziling Pluton in Jiuyishan Area, Nanling: Evidence from Zircon U-Pb Geochronology, Petrogeochemistry, and Sr-Nd-Hf Isotopes
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摘要: 九嶷山地区砂子岭岩体作为南岭花岗岩带的有机组成部分,对其主要岩石类型开展了年代学研究,系统的LA-ICP-MS锆石定年结果表明,含斑中细粒花岗闪长岩成岩年龄为151.9±1.1 Ma、152.1±1.1 Ma,中细粒斑状二长花岗岩成岩年龄为154.1±1.2 Ma;确定其成岩年代为燕山早期,而不是以前普遍认为的印支期.岩石地球化学分析显示,砂子岭岩体具有富硅碱贫钙镁、K2O/Na2O为1.37~2.65、准铝-过铝质(0.93~1.09),FeO*/MgO比值大(5.43~15.33,平均7.14)等特点;岩石稀土含量介于186.75×10-6~413.17×10-6之间,明显高于世界花岗岩均值,稀土元素配分曲线呈右倾轻稀土富集型,具明显铕负异常,δEu值为0.095~0.224;岩石富集Ga、Y、Nb、Zr、Hf等大离子高场强元素及亏损Ni、Cr、Eu、Ti、V、P、Sr等元素,Ga/Al比值为245×10-6~582×10-6(平均值350×10-6)、Zr+Nb+Ce+Y为256.8×10-6~630.7×10-6(平均值441.95×10-6),显示A型花岗岩地球化学属性,形成于伸展构造体系的造山后环境.Sr、Nd、Hf同位素显示砂子岭岩体具较高Sr同位素初始值(ISr=0.716 03~0.718 17),较低的εNd(t)(-6.8~-7.4)、εHf(t)(4.8~-14.2)值特点;揭示其源区为地壳杂砂岩/泥质岩的部分熔融,成岩过程中有地幔物质的贡献;钕、铪模式年龄较接近,分别为1 498~1 546 Ma与1 061~1 756 Ma,暗示其源岩从地幔储库中脱离的时间为中元古代.结合南岭地区地质演化史,中生代九嶷山地区恰处于板块拼合带及太平洋板块弧后伸展的构造背景之下,具发生过岛弧岩浆作用、构造相对薄弱且存在大量具较高Lu-Hf、Sm-Nd同位素比值新生地壳物质的特点;地幔对流与软流圈上涌引发源区部分熔融形成具有类似同位素组成特征的A型花岗岩,即为砂子岭及九嶷山复式岩体的成因.Abstract: A study of LA-ICP-MS zircon U-Pb dating for Shaziling pluton composed of granodiorites and monzogranites from Jiuyishan area considered as a part of Nanling granite belt was carried out. The results of chronology indicate that the Shaziling pluton was formed during the early Yanshanian (151.9±1.1-154.1±1.2 Ma) instead of the Indosinian. The analyses of geochemistry indicate that the Shaziling pluton was characterized by rich silicon-alkali and poor calcium-magnesium with K2O/Na2O ratios of 1.37-2.65, Al2O3 of 0.93-1.09 and FeO*/MgO ratios of 5.43-15.33 (average 7.14); The content of rare earth elements in the range of 186.75 to 413.17×10-6 is significantly higher than the those of world average granite, which shows the right-leaning distribution of enriched light rare earth elements with obvious negative anomaly of Eu and δEu values of 0.095-0.224. These rocks are enriched in large ion lithophile elements (LILEs, e.g., Ga, Y, Nb, Zr, and Hf) and relatively depleted in high field strength elements (HFSEs, e.g., Ni, Cr, Eu, Ti, V, P, and Sr), with Ga/Al ratios of (245~582)×10-6 (average 350×10-6) and Zr+Nb+Ce+Y of (256.8-630.7)×10-6 (average 441.95×10-6), similar to geochemical features of A-type granites, which indicates the Shaziling pluton formed in the post- orogenic environment of the extensional tectonic system. Sr, Nd and Hf isotopes show that the Shaziling pluton has higher initial Sr isotope values of 0.71603 to 0.71817, lower εNd(t) values of -6.8 to -7.4 and εHf(t) values of 4.8 to -14.2, revealing that the source area occurred partial melting of crustal graywacke/pelite with a contribution of mantle materials during the diagenesis. Nd and Hf are relatively close in mode ages, with 1 498-1 546 Ma and 1 061-1 756 Ma, respectively, suggesting that the source rocks separated from the mantle reservoir during the Mesoproterozoic. Combined with the geological evolution of Nanling area that was in the tectonic setting of plate juncture zone and post-arc extension of Pacific plate, magmatism occurred in the Mesozoic Jiuyishan area in which the structure is relatively weak and there are a lot of new crustal materials with higher Lu/Hf and Sm/Nd isotope ratios. The Shaziling and Jiuyishan complex massif, similar to isotopic composition of A-type granites was formed by partial melting of the source area caused by mantle convection and upwelling of asthenosphere.
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Key words:
- A-type granites /
- zircon U-Pb dating /
- isotope /
- geochemistry /
- tectonic setting /
- Shaziling /
- Nanling
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图 7 砂子岭岩体(10 000×Ga/Al)vs(FeO*/MgO)/Ce /[(Na2O+K2O)/CaO]、(Zr+Nb+Ce+Y)vs(FeO*/MgO)、Nb-Y-Ce及Nb-Y-Ga判别图解(底图据Whalen et al., 1987)
Fig. 7. (10 000×Ga/Al)vs(FeO*/MgO)/Ce/[(Na2O+K2O)/CaO]、(Zr+Nb+Ce+Y)VS(FeO*/MgO)、Nb-Y-Ce and Nb-Y-Ga discrimination diagrams of Shaziling rock mass
表 3 砂子岭岩体Sr-Nd同位素数据
Table 3. Nd-Sr-Pb isotopic data for Xishan volcanic-intrusive complex rocks
样号 Rb(10-6) Sr(10-6) 87Rb/86Sr 87Sr/86Sr 误差2σ I(Sr) εSr(0) εSr(t) fRb/Sr Sm(10-6) Nd(10-6) 147Sm/134Nd 143Nd/144Nd 误差2σ INd εNd(t) T2DM fSm/Nd D116-1 290.1 86.9 9.652 0.737 82 0.000 001 0.716 28 473.0 169.9 115.71 9.180 36.55 0.151 9 0.512 215 0.000 012 0.512 059 -7.36 1 541 -0.23 D117-1 196.1 135.2 4.188 0.726 79 0.000 009 0.717 44 316.4 186.4 49.64 10.290 49.53 0.125 7 0.512 190 0.000 070 0.512 061 -7.32 1 542 -0.36 D118-1 188.6 137.6 3.959 0.726 39 0.000 003 0.717 55 310.7 187.9 46.87 10.310 51.17 0.121 8 0.512 183 0.000 060 0.512 058 -7.38 1 546 -0.38 12D72 166.8 145.2 3.318 0.724 86 0.000 005 0.717 59 289.0 188.4 39.12 14.370 86.74 0.100 2 0.512 168 0.000 010 0.512 067 -7.27 1 537 -0.49 12D73 222.1 120.0 5.347 0.727 74 0.000 001 0.716 03 329.9 166.3 63.66 9.417 48.29 0.118 0 0.512 210 0.000 040 0.512 091 -6.80 1 498 -0.40 13D13 196.3 118.2 4.799 0.728 68 0.000 004 0.718 17 343.2 196.7 57.03 11.790 64.36 0.110 8 0.512 180 0.000 060 0.512 068 -7.25 1 535 -0.44 表 4 砂子岭岩体Hf同位素数据
Table 4. Hf isotopic data for Xishan volcanic-intrusive complex rocks
测点号 176Hf/177Hf 2σ 176Lu/177Hf 176Yb/177Hf εHf(0) Age εHf(t) 2σ TDM 2σ T2DM 2σ 12D72-01 0.282 624 0.000 013 0.000 806 0.025 352 -5.2 153 -2.0 0.5 886 38 1 326 60 12D72-02 0.282 445 0.000 019 0.000 858 0.026 673 -11.5 151 -8.3 0.7 1 137 52 1 726 83 12D72-03 0.282 630 0.000 014 0.001 153 0.036 333 -5.0 152 -1.8 0.5 885 39 1 313 62 12D72-04 0.282 463 0.000 010 0.001 318 0.042 661 -10.9 151 -7.8 0.3 1 127 28 1 691 44 12D72-05 0.282 513 0.000 019 0.001 392 0.043 024 -9.1 151 -6.0 0.7 1 057 53 1 577 84 12D72-06 0.282 816 0.000 013 0.001 095 0.034 853 1.6 154 4.8 0.4 620 36 894 57 12D72-07 0.282 744 0.000 011 0.001 654 0.052 192 -1.0 152 2.2 0.4 733 32 1 061 49 12D72-08 0.282 603 0.000 012 0.000 951 0.030 035 -6.0 155 -2.7 0.4 918 33 1 371 53 12D72-09 0.282 557 0.000 009 0.000 865 0.027 294 -7.6 152 -4.3 0.3 980 26 1 475 42 12D72-10 0.282 593 0.000 008 0.001 011 0.027 185 -6.3 151 -3.1 0.3 934 24 1 397 38 12D72-11 0.282 278 0.000 017 0.000 630 0.015 328 -17.5 153 -14.2 0.6 1 362 47 2 097 75 12D72-12 0.282 600 0.000 020 0.000 940 0.024 645 -6.1 434 3.2 0.7 922 55 1 212 88 12D72-13 0.282 600 0.000 013 0.000 853 0.021 819 -6.1 151 -2.9 0.5 921 37 1 381 59 12D72-14 0.282 607 0.000 009 0.000 991 0.026 542 -5.8 151 -2.6 0.3 914 26 1 365 42 12D72-15 0.282 557 0.000 013 0.000 650 0.016 865 -7.6 151 -4.4 0.5 975 38 1 475 60 12D72-16 0.282 507 0.000 010 0.000 899 0.023 017 -9.4 154 -6.1 0.4 1 052 28 1 588 45 12D72-17 0.282 560 0.000 012 0.000 864 0.022 860 -7.5 152 -4.3 0.4 977 34 1 469 54 12D72-18 0.282 620 0.000 011 0.000 662 0.017 171 -5.4 151 -2.1 0.4 888 32 1 335 51 12D72-19 0.282 431 0.000 015 0.000 696 0.018 064 -12.1 154 -8.8 0.5 1 152 42 1 756 67 12D72-20 0.282 672 0.000 008 0.000 835 0.021 963 -3.5 154 -0.2 0.3 818 23 1 216 37 -
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