DETERMINATION OF THE EARLY PALEOZOIC GRANITE IN ZHIFANG AREA, EAST JUNGGAR, XINJIANG AND ITS GEOLOGICAL IMPLICATIONS
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摘要: 纸房花岗岩体位于新疆东准噶尔卡拉麦里构造带北侧。该岩体侵入的最新地层为中-上奥陶统荒草坡群, 并被晚志留世及早泥盆世地层不整合覆盖。对纸房花岗岩进行锆石SHRIMP U-Pb定年, 获得的206Pb/238U加权平均年龄为(463±7)~(436±4) Ma, 表明该岩体形成于晚奥陶世-早志留世, 是早古生代岩浆活动的产物。对已有的区域地质资料、岩体侵位时代及其与围岩接触关系进行综合分析后认为, 纸房花岗岩体的形成时代大致对应于卡拉麦里构造带内区域性角度不整合的形成时间, 推测该岩体为早古生代造山过程中形成的花岗质岩石。高Sr、低Yb、弱的Eu负异常等地球化学特征也显示其为埃达克型同造山花岗岩。纸房地区早古生代同造山花岗岩的存在为东准噶尔卡拉麦里构造带早古生代造山作用的确认提供了证据。
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关键词:
- 花岗岩 /
- 锆石SHRIMP U-Pb定年 /
- 东准噶尔 /
- 早古生代 /
- 造山作用
Abstract: Zhifang granite pluton outcrops in the northern part of Kalamaili tectonic belt, East Junggar Xinjiang. The latest strata intruded by the granite pluton are the Middle-Upper Ordovician Huangcaopo formation and it is unconformably covered by the Upper Silurian and Lower Devonian strata. Zircon SHRIMP U-Pb data showed that the weighted mean 206Pb/238U age was (463±7)~(436±4) Ma, which indicated that the granite pluton was emplaced during Late Ordovician and Early Silurian and it was the product of the early Paleozoic magmatic activity. Combining the existing regional geological data, the emplacement age of the granite pluton and the contact relation with the country rocks, it is speculated that the forming time of the granite pluton roughly corresponds to that of the regional angular unconformity in the Kalamaili tectonic belt and the Zhifang granite pluton might be formed during the early Paleozoic orogenic stage. The geochemical characteristics of high Sr, low Yb and weak negative Eu anomalies also suggests that it is the Adak-type syn-orogenic granite. Therefore determination of the syn-orogenic granite in Zhifang defines the presence of early Paleozoic orogenesis in Kalamaili tectonic belt, East Junggar.-
Key words:
- granite /
- zircon SHRIMP U-Pb data /
- East Junggar /
- early Paleozoic /
- orogenesis
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图 2 纸房北部地区地质图(据文献[41]修改)
Figure 2. Geological map of northern Zhifang area
图 5 纸房地区花岗岩稀土元素球粒陨石标准化配分型式图与微量元素原始地幔蛛网图(标准化数值据文献[45])
Figure 5. Chondrite-normalized rare earth element patterns and primitive mantle normalized trace element spider diagram of granites in Zhifang area, East Junggar
表 1 东准噶尔纸房地区花岗岩主量元素(%)分析结果
Table 1. Major element concentrations of granites in Zhifang area, East Junggar
样品号 SiO2 TiO2 Al2O3 Fe2O3T FeO MgO CaO MnO Na2O K2O P2O5 LOI TOTAL ZF-2 74.33 0.25 13.35 2.2 0.90 0.62 1.6 0.04 5.4 0.72 0.05 1.38 99.95 ZF-3 73.64 0.24 13.12 2.07 0.88 0.95 1.65 0.05 6.24 0.35 0.05 1.59 99.94 ZF-4 75.38 0.22 12.92 1.91 0.75 0.62 1.26 0.06 5.79 0.47 0.05 1.32 99.99 ZF-5 74.38 0.23 12.49 1.97 0.55 0.64 2.08 0.02 5.56 0.54 0.05 2.01 99.96 ZF-7 73.28 0.24 13.76 2.10 0.68 0.66 1.61 0.06 4.75 2.24 0.06 1.20 99.96 表 2 东准噶尔纸房地区花岗岩微量元素(×10-6)分析结果
Table 2. Trace element concentrations of granites in Zhifang area, East Junggar
样品号 Li Be Sc V Cr Co Ni Cu Zn Ga Rb Sr Y Zr Nb Cs Ba La Ce Pr Nd Sm Eu ZF-2 5.09 0.72 4.46 20.2 4.39 2.75 0.60 1.36 12.1 11.4 6.8 494 13.4 98.7 3.36 0.09 538 15.7 34.1 3.46 12.3 2.39 0.68 ZF-3 7.50 0.75 4.52 31.6 1.36 3.12 2.46 7.97 19.1 11.0 3.0 506 15.4 102 3.31 0.08 153 16.9 40.5 3.95 14.1 2.87 0.67 ZF-4 5.30 0.63 4.14 20.6 0.86 2.52 0.65 1.21 17.7 10.9 4.3 778 13.7 91.9 3.03 0.08 110 16.1 37.2 3.63 13.0 2.57 0.75 ZF-5 4.65 0.77 4.38 23.3 0.96 2.58 0.65 1.01 9.7 10.1 4.5 790 12.7 86.7 3.04 0.13 113 13.9 32.3 3.18 11.4 2.31 0.63 ZF-7 4.54 0.91 4.93 22.3 0.79 2.82 0.57 1.42 20.4 12.6 17.3 340 15.3 105 3.54 0.11 1005 18.4 42.2 4.06 14.5 2.85 0.73 样品号 Gd Tb Dy Ho Er Tm Yb Lu Hf Ta Tl Pb Bi Th U ΣREE (La/Sm)N (Gd/Yb)N (La/Yb)N Eu/Eu* ZF-2 2.17 0.38 2.09 0.48 1.54 0.28 1.84 0.30 3.19 0.31 0.02 2.02 0.02 3.76 1.17 192.66 4.24 0.98 6.12 0.89 ZF-3 2.52 0.42 2.47 0.53 1.68 0.31 2.02 0.33 3.1 0.29 0.01 2.58 0.02 3.83 1.05 214.99 3.80 1.03 6.00 0.74 ZF-4 2.30 0.38 2.17 0.46 1.52 0.27 1.79 0.29 2.82 0.28 0.02 2.57 0.04 3.42 0.83 201.87 4.04 1.06 6.45 0.93 ZF-5 2.05 0.35 2.05 0.45 1.46 0.26 1.72 0.28 2.82 0.27 0.02 1.64 0.03 3.38 0.66 176.97 3.88 0.99 5.80 0.86 ZF-7 2.55 0.42 2.39 0.53 1.68 0.31 1.98 0.33 3.28 0.33 0.05 3.26 0.01 3.92 1.07 225.80 4.17 1.07 6.67 0.81 表 3 东准噶尔纸房地区花岗岩锆石SHRIMP U-Pb年龄分析结果
Table 3. Zircon SHRIMP U-Pb data of the granites in Zhifang area, East Junggar
点号 206Pbc/% U/10-6 Th/10-6 Th/U 206Pb*/10-6 207Pb*/206Pb* % 207Pb*/235U % 206Pb/238U 1σ 206Pb/238U年龄/Ma 1σ ZF-2-1.1 0.46 152 85 0.58 9.5 0.05689 2.7 0.57 3.0 0.07253 1.4 451.4 6.0 ZF-2-2.1 0.87 105 42 0.41 6.6 0.05793 4.2 0.58 4.5 0.07222 1.5 449.5 6.5 ZF-2-3.1 0.41 122 56 0.47 7.7 0.05973 2.7 0.60 3.1 0.07323 1.5 455.6 6.6 ZF-2-4.1 2.54 97 43 0.46 6.3 0.05389 12.9 0.54 13.0 0.07328 1.6 455.9 7.2 ZF-2-5.1 0.70 94 40 0.44 5.9 0.05864 6.7 0.59 6.9 0.07270 1.6 452.4 6.9 ZF-2-6.1 0.80 136 85 0.65 8.6 0.05908 5.4 0.60 5.6 0.07329 1.4 456.0 6.3 ZF-2-7.1 1.32 150 83 0.57 9.8 0.05571 5.9 0.58 6.1 0.07496 1.5 465.9 6.6 ZF-2-8.1 1.19 91 41 0.46 6.0 0.05139 8.5 0.53 8.6 0.07523 1.7 467.6 7.5 ZF-2-9.1 0.62 105 50 0.49 6.7 0.05427 4.3 0.56 4.6 0.07420 1.5 461.4 6.6 ZF-2-10.1 1.40 104 46 0.46 6.7 0.05276 9.1 0.54 9.2 0.07405 1.6 460.5 6.9 ZF-2-11.1 0.69 134 78 0.61 8.6 0.05287 5.3 0.54 5.5 0.07463 1.4 464.0 6.3 ZF-2-12.1 0.00 155 97 0.65 9.9 0.05794 3.0 0.59 3.3 0.07436 1.5 462.4 6.7 ZF-3-1.1 0.69 108 53 0.51 6.9 0.05242 5.2 0.5 5.4 0.07401 1.5 460.3 6.6 ZF-3-2.1 0.80 110 62 0.58 7.1 0.05294 6.1 0.5 6.3 0.07444 1.5 462.8 6.7 ZF-3-3.1 0.82 97 43 0.46 6.4 0.05478 4.4 0.6 4.6 0.07617 1.6 473.2 7.3 ZF-3-4.1 0.18 269 180 0.69 17.2 0.05564 1.7 0.6 2.1 0.07412 1.3 461.0 5.7 ZF-3-5.1 1.55 168 102 0.63 10.9 0.05132 6.6 0.5 6.8 0.07424 1.6 461.7 7.1 ZF-3-6.1 1.03 162 134 0.85 10.3 0.05543 6.1 0.6 6.3 0.07316 1.4 455.2 6.2 ZF-3-7.1 0.80 207 174 0.87 13.7 0.05093 4.1 0.5 4.3 0.07667 1.4 476.2 6.2 ZF-3-8.1 0.92 137 74 0.56 9.1 0.05234 7.9 0.6 8.0 0.07624 1.5 473.6 6.8 ZF-3-9.1 1.60 141 76 0.56 8.9 0.04782 9.0 0.5 9.1 0.07201 1.5 448.3 6.5 ZF-7-1.1 0.35 127 67 0.54 7.6 0.05899 3.3 0.57 3.7 0.06973 1.9 434.5 7.8 ZF-7-3.1 0.48 102 54 0.55 6.2 0.05924 4.2 0.58 4.5 0.07049 1.6 439.1 6.6 ZF-7-4.1 0.95 92 39 0.44 5.6 0.05470 4.9 0.53 5.5 0.06995 2.4 435.9 10.2 ZF-7-5.1 1.08 101 50 0.51 6.4 0.05211 9.4 0.52 9.5 0.07263 1.6 452.0 7.2 ZF-7-6.1 0.00 113 49 0.45 6.7 0.06264 4.4 0.60 4.9 0.06896 2.1 429.9 8.9 ZF-7-7.1 1.02 140 66 0.49 8.6 0.05362 2.9 0.52 3.4 0.07055 1.8 439.4 7.5 ZF-7-8.1 0.84 125 61 0.50 7.6 0.05047 6.8 0.49 6.9 0.07041 1.5 438.6 6.4 ZF-7-9.1 0.00 165 107 0.67 9.7 0.05393 2.9 0.51 3.3 0.06859 1.5 427.7 6.2 ZF-7-10.1 0.44 101 45 0.46 6.0 0.05748 4.0 0.54 4.3 0.06847 1.6 426.9 6.4 ZF-7-11.1 0.12 287 171 0.62 17.5 0.05680 1.9 0.56 2.3 0.07091 1.3 441.7 5.5 ZF-7-12.1 0.63 98 50 0.53 5.9 0.05568 5.2 0.53 5.5 0.06942 1.6 432.7 6.9 注:Pbc和Pb*分别表示普通铅和放射性成因铅 -
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