Geological, Geochemical Characteristics of Hongshan Pluton: Constraint for Lower Crust of West Junggar, Xinjiang
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摘要: 准噶尔盆地基底性质历年来一直存在争议, 而花岗岩地球化学特征对下地壳性质具有指示意义.研究发现, 红山岩体的岩石类型主要为碱长花岗岩, 具有高SiO2、低Al2O3、偏碱性、准铝质、轻重稀土分馏相对明显且富集轻稀土、明显的Eu异常、富集Rb、Th、K等大离子亲石元素及Zr、Hf等高场强元素而强烈亏损Sr、Ba、P、Ti等元素的A型花岗岩特征, 形成于后碰撞的张性环境中.SIMS和LA-ICP-MS测试获得的岩体侵位年龄分别为315.7±2.4Ma(MSWD=0.82)和317.8±3.8Ma(MSWD=2.8), 指示该岩体为晚石炭世早期的产物, 与西准噶尔后碰撞岩浆活动的时限一致.红山碱长花岗岩的结晶温度为680~860℃, Lu-Hf、Sr-Nd同位素特征共同表明西准噶尔的基底是由亏损地幔演化而来的年轻地壳物质组成.Abstract: The basement of Junggar basin has been disputed for years, the geochemical characteristics of the granites are indicative of the lower crust, our research shows that, the Hongshan alkali feldspar granites from the West Junggar region, Xingjiang, are characterized by high SiO2, low Al2O3, high total alkali, metalumious, and LREE along with significant negative Eu anomalies, enrichment of large ion lithophile elements (such as Th, Rb and K) and high field-strength elements (such as Zr and Hf), strong depletion of Sr, Ba, P and Ti, showing geochemical features reminiscent of A-type granites. It can further infer that it was formed in post-collisional extensional environment. Zircon U-Pb dating by SIMS and LA-ICP-MS yield ages of 315.7±2.4Ma and 317.8±3.8Ma, suggesting that the pluton was emplaced at early Late Carboniferous, which is contemporary with the timing of the Late Paleozoic post-collisional magmatism in the region. Mineral thermometry implies that the pluton formed at a temperature from 680 to 860℃. On the other hand, zircon Lu-Hf and Sr-Nd isotopic features show a depleted mantle-like signature, suggesting that the magma was sourced from juvenile crust.
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Key words:
- A-type granite /
- Late Carboniferous /
- post-collision /
- lower crust /
- Hongshan pluton /
- West Junggar /
- geochemistry
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图 3 红山岩体岩相学特征
a.钾长石泥化(-)；b.显微文象结构(+)；c.斜长石绢云母化(-)；d.斜长石绢云母化(+)；e.闪长玢岩斑状结构(-)；f.闪长玢岩斑状结构(+)
Fig. 3. Microphotographs of Hongshan pluton
图 4 红山花岗岩中长石成分Or-Ab-An分类
Fig. 4. Relation of Or-Ab-An of feldspars from Hongshan granite
图 5 红山花岗岩部分锆石CL图像、激光测点位置
红色圈为SIMS测点数据；黄色圈为LA-ICP-MAS测点数据
Fig. 5. Cathode-luminescence photos of zircons from Hongshan granite
图 7 红山岩体K2O-SiO2关系和A/CNK-A/NK关系
数据来源于表 6；前人资料据王晓伟等(2011)、苏玉平等(2006)和Geng et al.(2009)
Fig. 7. Relation of K2O- SiO2 and relation of A/CNK-A/NK of Hongshan pluton
图 8 红山岩体稀土元素球粒陨石标准化配分曲线和微量元素比值蛛网图
MORB标准化值据Sun and Mcdonough(1989)；球粒陨石标准化值据Taylor and McLennan(1985)；样品数据来源于表 6、苏玉平等(2006)和Geng et al.(2009)
Fig. 8. Chondrite normalized REE distribution patterns and primitive mantle normalized trace element spider diagrams of Hongshan pluton
图 9 红山岩体岩浆期次野外照片
a.碱长花岗岩和正长花岗岩的脉动接触，可见正长花岗岩冷凝边；b.正长花岗岩与二长花岗岩的脉动接触，可见二长花岗岩的冷凝边；c.二长花岗岩与闪长岩的脉动接触；d.闪长岩脉侵入到正长花岗岩中
Fig. 9. Pictures of Hongshan pluton about its stage
图 10 红山花岗岩SiO2-氧化物Harker关系
方框数据来源于Geng et al.(2009)；圆圈数据来源于苏玉平等(2006)；三角形数据来源于表 6
Fig. 10. Relation of SiO2-oxides of Hongshan granite
图 11 红山花岗岩Ce/Nb-Y/Nb和Nb-Y-Ce关系
底图据Eby(1992)；样品数据来源于表 6、苏玉平等(2006)和Geng et al.(2009)
Fig. 11. Relations of Ce/Nb-Y/Nb and Nb-Y-Ce of Hongshan granite
图 12 红山岩体与其他岩体构造判别对比
底图据Pearce et al.(1984)；样品数据来源于表 6、Chen and Arakawa(2005)、Geng et al.(2009)、庞振甲等(2010)和苏玉平等(2006)
Fig. 12. Discriminant between Hongshan pluton and other plutons
图 14 红山岩体侵位年龄t-εHf(t)关系
数据来源于表 6、Geng et al.(2009)和Tang et al.(2012)
Fig. 14. Relation of t-εHf(t) for Hongshan pluton
图 15 克拉玛依地区花岗岩侵位年龄t-εNd(t)关系
数据来源于伍建机和陈斌(2004)、Chen and Arakawa(2005)、苏玉平等(2006)、Geng et al.(2009)、贺敬博和陈斌(2011)和Tang et al.(2012)
Fig. 15. Relation of t-εNd(t) for the granites in Karamay area
表 1 碱长花岗岩中条纹长石电子探针分析结果(%)
Table 1. Electron probe analyses of perthites in the alkali feldspar granites (%)
样号 测点 SiO2 TiO2 Al2O3 FeO MnO MgO CaO Na2O K2O 总量 48-2-1 客晶 67.54 0.00 19.36 0.21 0.02 0.00 0.74 10.74 0.20 98.83 主晶 65.16 0.02 17.69 0.13 0.00 0.00 0.03 0.59 15.93 99.55 48-2-2 客晶 66.58 0.02 20.12 0.15 0.00 0.00 1.49 10.64 0.24 99.24 主晶 65.20 0.00 17.80 0.11 0.00 0.00 0.03 1.35 14.69 99.18 48-2-3 客晶 66.69 0.00 20.05 0.15 0.01 0.00 1.36 10.34 0.20 98.81 主晶 65.18 0.00 17.83 0.14 0.00 0.00 0.02 1.30 14.79 99.26 20-1-3 客晶 67.17 0.02 20.04 0.11 0.01 0.00 1.47 10.50 0.16 99.47 主晶 65.07 0.00 17.81 0.14 0.00 0.00 0.07 1.45 14.74 99.27 20-1-8 客晶 67.01 0.00 19.96 0.11 0.00 0.01 1.40 10.57 0.30 99.38 主晶 98.79 0.02 0.01 0.02 0.00 0.01 0.00 0.00 0.01 98.84 48-1-2 客晶 66.78 0.02 19.90 0.18 0.00 0.00 1.25 10.50 0.26 98.91 主晶 65.11 0.02 17.77 0.22 0.00 0.00 0.01 1.02 14.76 98.90 48-1-6 客晶 66.58 0.01 19.99 0.15 0.00 0.01 1.50 10.36 0.16 98.75 主晶 64.20 0.00 17.87 0.04 0.01 0.01 0.03 0.33 16.17 98.65 26-1-7 客晶 67.07 0.00 19.83 0.12 0.00 0.00 1.30 10.56 0.14 99.03 主晶 65.76 0.00 18.00 0.05 0.02 0.00 0.09 2.45 12.82 99.18 22-1-5 客晶 67.95 0.02 19.48 0.17 0.00 0.00 0.64 10.79 0.22 99.26 主晶 65.04 0.02 17.45 0.12 0.00 0.01 0.12 1.16 14.69 98.61 样号 测点 Si Ti Al Cr Fe Mn Mg Ca Na K Ab An Or 48-2-1 客晶 2.99 0.00 1.01 0.01 0.00 0.00 0.03 0.92 0.01 2.99 95.21 3.61 1.17 主晶 3.02 0.00 0.97 0.01 0.00 0.00 0.00 0.05 0.94 3.02 5.30 0.14 94.56 48-2-2 客晶 2.94 0.00 1.05 0.01 0.00 0.00 0.07 0.91 0.01 2.94 91.57 7.07 1.36 主晶 3.02 0.00 0.97 0.00 0.00 0.00 0.00 0.12 0.87 3.02 12.25 0.13 87.62 48-2-3 客晶 2.95 0.00 1.05 0.01 0.00 0.00 0.06 0.89 0.01 2.95 92.12 6.70 1.18 主晶 3.02 0.00 0.97 0.01 0.00 0.00 0.00 0.12 0.87 3.02 11.78 0.10 88.13 20-1-3 客晶 2.96 0.00 1.04 0.00 0.00 0.00 0.07 0.90 0.01 2.96 91.99 7.10 0.91 主晶 3.02 0.00 0.97 0.01 0.00 0.00 0.00 0.13 0.87 3.02 12.95 0.33 86.73 20-1-8 客晶 2.96 0.00 1.04 0.00 0.00 0.00 0.07 0.90 0.02 2.96 91.59 6.72 1.69 主晶 4.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4.00 43.18 0.00 56.82 48-1-2 客晶 2.96 0.00 1.04 0.01 0.00 0.00 0.06 0.90 0.01 2.96 92.44 6.08 1.48 主晶 3.02 0.00 0.97 0.01 0.00 0.00 0.00 0.09 0.87 3.02 9.46 0.05 90.48 48-1-6 客晶 2.95 0.00 1.04 0.01 0.00 0.00 0.07 0.89 0.01 2.95 91.75 7.33 0.92 主晶 3.01 0.00 0.99 0.00 0.00 0.00 0.00 0.03 0.97 3.01 2.99 0.14 96.88 26-1-7 客晶 2.96 0.00 1.03 0.00 0.00 0.00 0.06 0.90 0.01 2.96 92.87 6.30 0.83 主晶 3.02 0.00 0.97 0.00 0.00 0.00 0.00 0.22 0.75 3.02 22.38 0.43 77.18 22-1-5 客晶 2.99 0.00 1.01 0.01 0.00 0.00 0.03 0.92 0.01 2.99 95.61 3.13 1.25 主晶 3.03 0.00 0.96 0.00 0.00 0.00 0.01 0.11 0.87 3.03 10.67 0.62 88.70 
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表 2 碱长花岗岩中斜长石电子探针分析结果(%)
Table 2. Electron probe analyses of plagioclases in the alkali feldspar granites (%)
样号 SiO2 TiO2 Al2O3 Cr2O3 FeO MnO MgO CaO Na2O K2O 总量 48-2-7-1 66.75 0.00 19.89 0.02 0.15 0.00 0.00 1.51 10.10 0.39 98.81 48-2-7-2 66.81 0.01 20.01 0.00 0.15 0.00 0.00 1.47 10.02 0.47 98.94 48-2-9-1 66.43 0.00 19.81 0.02 0.16 0.03 0.02 1.41 10.20 0.45 98.51 20-1-7-1 67.13 0.03 19.84 0.00 0.16 0.00 0.00 1.34 10.55 0.43 99.46 26-1-2-3 67.41 0.01 19.31 0.05 0.07 0.01 0.00 0.78 11.08 0.14 98.87 样号 Si Ti Al Cr Fe Mn Mg Ca Na K Ab An Or 48-2-7-1 2.96 0.00 1.04 0.00 0.01 0.00 0.00 0.07 0.87 0.02 90.25 7.47 2.29 48-2-7-2 2.96 0.00 1.04 0.00 0.01 0.00 0.00 0.07 0.86 0.03 89.93 7.28 2.79 48-2-9-1 2.96 0.00 1.04 0.00 0.01 0.00 0.00 0.07 0.88 0.03 90.50 6.90 2.60 20-1-7-1 2.96 0.00 1.03 0.00 0.01 0.00 0.00 0.06 0.90 0.02 91.15 6.39 2.46 26-1-2-3 2.98 0.00 1.01 0.00 0.00 0.00 0.00 0.04 0.95 0.01 95.47 3.73 0.80
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表 3 碱长花岗岩中角闪石电子探针分析结果(%)
Table 3. Electron probe analyses of hornblendes in the alkali feldspar granites (%)
样号 48-2-4 48-2-5 48-2-11 20-1-1 20-1-1 20-1-2 20-1-3 20-1-4 20-1-5 20-1-7 20-1-9 20-1-10 SiO2 44.40 43.78 43.63 44.95 45.46 45.29 45.28 45.69 45.51 44.61 45.49 44.82 TiO2 1.54 1.36 1.36 1.58 1.41 1.54 1.54 1.57 1.29 1.50 1.56 1.46 Al2O3 5.92 6.62 6.72 5.73 5.74 5.71 5.93 5.73 5.55 5.71 5.85 5.79 FeO 26.86 26.72 25.92 24.95 24.58 23.73 24.87 24.65 25.69 26.02 24.96 25.54 MnO 1.17 1.02 1.15 0.97 0.91 0.92 1.07 0.98 1.15 1.17 0.93 1.08 MgO 4.92 4.93 4.64 6.05 6.74 6.70 6.14 6.57 6.22 5.57 6.68 6.22 CaO 9.76 10.13 9.91 9.59 9.71 9.53 9.40 9.58 9.12 9.74 9.65 9.60 Na2O 2.13 2.16 2.24 2.19 2.21 2.27 2.34 2.23 2.13 2.31 2.31 2.39 K2O 0.77 0.93 0.78 0.73 0.70 0.73 0.73 0.70 0.63 0.71 0.74 0.71 Cr2O3 0.02 0.01 0.00 0.00 0.00 0.00 0.01 0.01 0.01 0.01 0.01 0.01 总量 97.46 97.65 96.35 96.74 97.45 96.42 97.30 97.72 97.30 97.34 98.16 97.62 Si(T) 6.97 6.88 6.93 7.03 7.03 7.06 7.03 7.04 7.06 6.99 7.00 6.98 AlⅣ(T) 1.03 1.12 1.07 0.97 0.97 0.94 0.97 0.96 0.94 1.01 1.00 1.02 Total T 8 8 8 8 8 8 8 8 8 8 8 8 AlⅥ(C) 0.07 0.10 0.19 0.09 0.07 0.11 0.11 0.09 0.07 0.04 0.05 0.04 Ti(C) 0.18 0.16 0.16 0.19 0.16 0.18 0.18 0.18 0.15 0.18 0.18 0.17 Cr(C) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Fe3+(C) 0.28 0.23 0.17 0.27 0.31 0.24 0.29 0.30 0.42 0.25 0.31 0.24 Mg(C) 1.15 1.15 1.10 1.41 1.55 1.56 1.42 1.51 1.44 1.30 1.53 1.44 Fe2+(C) 3.32 3.35 3.38 3.05 2.90 2.91 3.00 2.92 2.92 3.23 2.92 3.10 Mn(C) 0.07 0.07 0.11 0.05 0.03 0.05 0.06 0.04 0.00 0.07 0.02 0.01 Total C 5 5 5 5 5 5 5 5 5 5 5 5 Mn(B) 0.08 0.06 0.05 0.08 0.09 0.07 0.08 0.09 0.15 0.09 0.10 0.13 Fe2+(B) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Ca(B) 1.64 1.70 1.69 1.61 1.61 1.59 1.56 1.58 1.52 1.64 1.59 1.60 Na(B) 0.28 0.23 0.27 0.32 0.30 0.34 0.35 0.33 0.34 0.28 0.31 0.27 Total B 2 2 2 2 2 2 2 2 2 2 2 2 Na(A) 0.37 0.43 0.42 0.35 0.36 0.35 0.35 0.34 0.30 0.43 0.38 0.45 K(A) 0.23 0.27 0.23 0.21 0.20 0.21 0.21 0.20 0.18 0.21 0.21 0.21 Total A 0.60 0.70 0.66 0.56 0.56 0.56 0.56 0.54 0.49 0.64 0.59 0.66 Total 15.60 15.70 15.66 15.56 15.56 15.56 15.56 15.54 15.49 15.64 15.59 15.66 Fe3+# 0.08 0.06 0.05 0.08 0.10 0.08 0.09 0.09 0.13 0.07 0.10 0.07 Fe# 0.76 0.76 0.76 0.70 0.67 0.67 0.70 0.68 0.70 0.73 0.68 0.70 注：Fe3+#= Fe3+/(Fe3++Fe2+)，Fe#= Fetotal/(Fetotal+Mg).
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表 4 红山花岗岩锆石LA-ICP-MS分析结果
Table 4. U-Pb isotopic analyses for zircons from Hongshan granite by LA-ICP-MS
样品分析点 含量(10-6) Th/U 同位素比值 年龄(Ma) Pb U Th 207Pb/206Pb±1σ 207Pb/235U±1σ 206Pb/238U±1σ 207Pb/206Pb±1σ 207Pb/235U±1σ 206Pb/238U±1σ PM008-26-1-1 71 354 210 0.57 0.05172±0.00280 0.35474±0.01856 0.05062±0.00078 272±124 308±14 315±5 PM008-26-1-2 57 367 162 0.43 0.05854±0.00310 0.39994±0.02096 0.05009±0.00076 550±115 342±15 321±5 PM008-26-1-3 60 421 166 0.38 0.05742±0.00287 0.40102±0.01964 0.05103±0.00078 509±109 342±14 311±4 PM008-26-1-4 91 649 242 0.36 0.05435±0.00243 0.36859±0.01606 0.04935±0.00072 387±100 319±12 322±5 PM008-26-1-5 44 274 123 0.43 0.06192±0.00372 0.42519±0.02545 0.05118±0.00088 672±128 360±18 336±5 PM008-26-1-6 79 517 214 0.40 0.05525±0.00263 0.40835±0.01959 0.05347±0.00079 433±101 348±14 321±6 PM008-26-1-7 43 336 108 0.31 0.05107±0.00365 0.35762±0.02298 0.05112±0.00102 243±194 310±17 319±4 PM008-26-1-8 103 772 281 0.35 0.05401±0.00227 0.37491±0.01485 0.05071±0.00060 372±94 323±11 326±4 PM008-26-1-9 101 566 275 0.47 0.05224±0.00235 0.37283±0.01612 0.05180±0.00067 295±102 322±12 309±5 PM008-26-1-10 87 581 237 0.39 0.05143±0.00288 0.35115±0.02042 0.04902±0.00074 261±130 306±15 304±7 PM008-26-1-11 73 510 201 0.38 0.05249±0.00441 0.34692±0.02868 0.04827±0.00116 306±193 302±22 311±5 PM008-26-1-12 75 491 203 0.40 0.05033±0.00366 0.33738±0.02302 0.04949±0.00085 209±170 295±17 319±5 PM008-26-1-13 58 369 157 0.41 0.05668±0.00305 0.38871±0.02012 0.05069±0.00081 480±120 333±15 330±4 PM008-26-1-14 63 440 164 0.36 0.05873±0.00295 0.42112±0.02031 0.05253±0.00073 567±111 357±15 321±5 PM008-26-1-15 48 304 135 0.43 0.05882±0.00340 0.40665±0.02219 0.05110±0.00085 561±128 346±16 301±6 PM008-26-1-16 90 631 248 0.38 0.06092±0.00493 0.40115±0.03202 0.04784±0.00101 635±373 342±23 317±4 PM008-26-1-17 119 678 352 0.50 0.05310±0.00242 0.36890±0.01672 0.05033±0.00059 332±99 319±12 314±4 PM008-26-1-18 52 332 150 0.44 0.06469±0.00403 0.43506±0.02476 0.04985±0.00066 765±136 367±18 308±6 PM008-26-1-19 67 506 206 0.39 0.05937±0.00412 0.38829±0.02301 0.04901±0.00094 589±145 333±17 315±5
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表 5 红山花岗岩锆石SIMS分析结果表
Table 5. U-Pb isotopic analyses for zircons from Hongshan granite by SIMS
样品分析点 含量(10-6) Th/U 同位素比值 年龄(Ma) Pb U Th 207Pb/206Pb±1σ 206Pb/238U±1σ 207Pb/206Pb±1σ 207Pb/235U±1σ 206Pb/238U±1σ PM008-26-1-1 16 272 119 0.44 0.05409±0.02615 0.05035±0.01520 335±66 319±9 316±5 PM008-26-1-2 12 195 90 0.46 0.05484±0.03683 0.05047±0.01504 351±92 321±12 317±5 PM008-26-1-3 10 163 74 0.46 0.05047±0.03982 0.05145±0.01527 217±90 311±12 323±5 PM008-26-1-4 9 157 72 0.46 0.05288±0.05272 0.04949±0.01512 324±116 313±15 311±5 PM008-26-1-5 5 75 30 0.39 0.05025±0.05200 0.05063±0.01527 207±116 305±14 318±5 PM008-26-1-6 16 254 134 0.53 0.04958±0.03237 0.05063±0.01518 176±74 302±9 318±5 PM008-26-1-7 21 365 118 0.32 0.05264±0.02287 0.05005±0.01505 266±59 309±8 314±5 PM008-26-1-8 20 348 123 0.36 0.05359±0.02904 0.04977±0.01504 319±70 314±10 313±5 PM008-26-1-9 10 163 70 0.43 0.05586±0.03334 0.04989±0.01513 447±72 330±10 314±5 PM008-26-1-10 18 310 114 0.37 0.05320±0.02941 0.04982±0.01507 281±78 309±10 313±5 PM008-26-1-11 15 253 97 0.39 0.05457±0.02661 0.05180±0.01502 395±59 334±9 326±5 PM008-26-1-12 11 194 65 0.34 0.05264±0.03157 0.05012±0.01505 254±84 308±11 315±5 PM008-26-1-13 13 219 79 0.36 0.05354±0.02932 0.04992±0.01579 302±76 312±10 314±5 PM008-26-1-14 8 138 49 0.36 0.04914±0.04357 0.04993±0.01513 155±99 296±12 315±5 PM008-26-1-15 6 104 29 0.28 0.05495±0.04340 0.04994±0.01612 295±129 308±16 309±5
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表 6 红山岩体碱长花岗岩主微量元素分析结果
Table 6. Major and trace elements of the alkali feldspar granites from Hongshan pluton
样品号 PM26-17-1 PM26-22-1 PM26-26-1 PM26-50-1 PM26-92-1 PM26-99-1 SiO2 72.64 71.72 73.18 72.06 73.05 71.14 TiO2 0.33 0.37 0.33 0.35 0.34 0.34 Al2O3 12.90 12.83 12.84 13.14 12.55 13.36 Fe2O3 1.29 2.31 1.26 1.85 0.98 1.50 FeO 1.47 1.33 1.53 1.38 1.78 1.58 FeOT 2.63 3.41 2.66 3.04 2.66 2.93 MnO 0.08 0.11 0.07 0.07 0.08 0.08 MgO 0.41 0.57 0.38 0.43 0.48 0.46 CaO 1.11 1.23 1.02 0.99 1.29 1.13 Na2O 4.62 4.58 4.43 4.53 4.32 5.08 K2O 4.29 4.07 4.15 4.28 4.18 4.26 P2O5 0.06 0.08 0.06 0.06 0.07 0.06 H2O+ 0.45 0.49 0.34 0.62 0.61 0.51 CO2 0.18 0.09 0.09 0.13 0.09 0.02 LOI 0.5 0.62 0.51 0.49 0.55 0.35 Total 100.33 100.40 100.19 100.38 100.37 99.87 A/NK 0.90 0.91 0.94 0.95 0.90 0.89 A/CNK 1.05 1.07 1.09 1.09 1.08 1.03 Rb 77.00 79.00 91.00 100.00 92.00 91.00 Sr 86.00 82.00 75.00 76.00 84.00 72.00 Ba 560.00 537.00 532.00 504.00 533.00 523.00 U 1.81 2.05 1.83 2.44 3.04 2.27 Th 8.46 9.65 9.70 9.98 8.14 10.50 Nb 13.20 15.50 14.10 17.00 15.80 15.40 Ta 0.86 1.04 0.93 1.17 1.09 1.02 Zr 409.00 405.00 372.00 405.00 379.00 427.00 Hf 9.48 9.83 8.92 9.87 9.23 10.2 Ga 20.80 21.30 21.10 21.90 20.70 21.40 Y 42.80 51.10 45.80 53.90 56.10 51.70 Zn 79.00 74.80 54.10 64.80 50.40 80.50 La 31.70 24.00 38.60 22.50 18.30 36.10 Ce 72.30 58.60 84.40 57.10 49.80 81.30 Pr 8.75 8.00 9.95 7.58 7.25 9.95 Nd 34.70 33.30 38.00 32.40 32.80 39.50 Sm 7.60 8.23 7.83 7.93 8.40 8.68 Eu 0.64 0.59 0.65 0.62 0.63 0.65 Gd 6.91 7.90 7.13 7.65 8.04 7.76 Tb 1.19 1.38 1.22 1.36 1.48 1.39 Dy 7.55 8.98 7.58 8.90 9.27 8.63 Ho 1.49 1.77 1.57 1.79 1.91 1.79 Er 4.48 5.32 4.71 5.58 5.83 5.30 Tm 0.68 0.80 0.74 0.86 0.87 0.80 Yb 4.45 5.51 4.88 5.67 5.82 5.45 Lu 0.67 0.84 0.76 0.88 0.90 0.86 ΣREE 183.09 165.25 207.98 160.89 151.33 208.20 LREE 155.67 132.74 179.39 128.19 117.22 176.21 HREE 27.42 32.52 28.59 32.70 34.12 31.99 LREE/HREE 5.68 4.08 6.27 3.92 3.44 5.51 LaN/YbN 8.69 5.31 9.66 4.85 3.84 8.07 δEu 0.26 0.22 0.26 0.24 0.23 0.24 δCe 1.00 1.00 0.98 1.03 1.04 0.99 TZr(℃) 855.44 853.16 852.68 859.74 848.23 854.12 注：检测单位为国土资源部武汉矿产资源监督检测中心；氧化物含量单位为%；稀土和微量含量单位为10-6.
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表 7 红山花岗岩Lu-Hf同位素数据
Table 7. Lu and Hf isotopic data of Hongshan granite
样号 176Yb/177Hf 176Lu/177Hf 176Hf/177Hf εHf(0) 1σ εHf(t) 1σ TDM1(Ma) TDM2(Ma) fLu/Hf PM008-26-1-1 0.063436 0.001691 0.283017 8.7 1.4 15.3 1.5 339 354 -0.95 PM008-26-1-2 0.069765 0.001871 0.282983 7.4 1.1 14.0 1.2 391 435 -0.94 PM008-26-1-3 0.055011 0.001629 0.283044 9.6 0.8 16.3 0.8 299 290 -0.95 PM008-26-1-4 0.053531 0.001441 0.283058 10.1 0.8 16.8 0.8 278 257 -0.96 PM008-26-1-5 0.038130 0.001032 0.282996 7.9 0.8 14.7 0.8 363 393 -0.97 PM008-26-1-6 0.040770 0.001107 0.283003 8.2 0.8 14.9 0.8 354 378 -0.97 PM008-26-1-7 0.072386 0.001963 0.283028 9.1 0.9 15.6 1.0 325 331 -0.94 PM008-26-1-8 0.058062 0.001558 0.283013 8.5 0.8 15.2 0.9 343 360 -0.95 PM008-26-1-9 0.036057 0.000979 0.283018 8.7 0.8 15.5 0.8 331 341 -0.97 PM008-26-1-10 0.040014 0.001080 0.283019 8.7 0.7 15.5 0.8 331 341 -0.97 PM008-26-1-11 0.043166 0.001192 0.283010 8.4 0.8 15.2 0.8 344 362 -0.96 PM008-26-1-12 0.049007 0.001327 0.283009 8.4 0.8 15.1 0.9 347 367 -0.96 PM008-26-1-13 0.091243 0.002479 0.283028 9.1 0.9 15.5 0.9 330 340 -0.93 PM008-26-1-14 0.047333 0.001269 0.282998 8.0 0.8 14.7 0.8 362 391 -0.96
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表 8 红山岩体年龄及相关信息
Table 8. The geochronological information of Hongshan pluton
岩性 年龄(Ma) 1σ 方法 数据来源 碱长花岗岩 244 - 锆石U-Pb 金成伟和张秀棋，1993 花岗岩 297 12 LA-ICP-MS Chen and Jahn, 2004 碱长花岗岩 301 4 LA-ICP-MS 苏玉平等，2006 黑云母二长花岗岩 304 1 LA-ICP-MS 冯乾文等，2012 闪长质岩墙 304 1 LA-ICP-MS 冯乾文等，2012 碱长花岗岩 305 4 SHRIMP 徐新等，2006 碱性花岗岩 309 - LA-ICP-MS 李永军等，2012 二长花岗岩 309.3 3.8 LA-ICP-MS 韩鑫等，2013 碱长花岗岩 315.7 2.4 SIMS 本文 碱长花岗岩 317.8 3.8 LA-ICP-MS 本文
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