Geochronology and geochemistry of the Aolansandui pluton in Horqin Right Wing Middle Banner of Inner Mongolia
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摘要:
内蒙古科尔沁右翼中旗敖兰三队侵入体的同位素年代学及岩石地球化学研究表明, 敖兰三队侵入体巨晶正长花岗岩具有低Sr、高Yb型花岗岩特征, 其LA-ICP-MS锆石206Pb/238U年龄加权平均值为220±1Ma, 表明该侵入体是晚三叠世早期侵位形成的。岩石高硅、富碱、高铁镁比、贫钙、贫镁和低钛; 稀土元素配分曲线呈现"海鸥式"分布特征, 显示强烈的Eu负异常。微量元素特征显示较低的Sr、Ba含量, 较高的Yb、Zr和Y含量, 在微量元素原始地幔标准化蛛网图上显示明显的Sr、Ba和Ti的负异常。岩石具有高的Rb/Sr和Rb/Nb, 显示出壳源岩浆的成分特征。综合分析表明, 本区巨晶正长花岗岩为低压下地壳部分熔融的产物。根据(Y+Nb)-Rb、(Yb+Ta)-Rb、Nb-Y-Ce三角图解, 并结合区域构造演化, 认为巨晶正长花岗岩形成于造山后伸展的构造环境。在中-晚三叠世, 内蒙古科尔沁右翼中旗地区构造体制经历了重要的转变, 由挤压体制转变为造山后软流圈上涌、岩石圈减薄。
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关键词:
- 科尔沁右翼中旗 /
- 敖兰三队侵入体 /
- 晚三叠世 /
- 低Sr高Yb型花岗岩
Abstract:Geochronology and geochemistry of the Aolansandui pluton in Horqin Right Wing Middle Banner of Inner Mongolia were studied. Zircon U-Pb dating demonstrates that the weighted mean 206Pb/238U age for the zircons from the syenogranite is 220±1Ma, suggesting Late Triassic. The syenogranite belongs to low-Sr and high-Yb type granitoids. The syenogranite is characterized by high SiO2, high alkali, high TFeO/MgO ratios, and low CaO, low MgO and lower TiO2 values. The syenogranite is characterized by "sea-gull" REE patterns and significant negative Eu anomaly as well as depletion of Sr and Ba and enrichment of Yb, Zr and Y. The high Rb/Sr and Rb/Nb ratios of the rock indicate a crustal origin. Comprehensive analysis shows that the syenitegranite was formed by low pressure felsic crust partial melting. In (Y+Nb)-Rb, (Yb+Ta)-Rb, Nb-Y-Ce diagrams combined with regional tec-tonic evolution, the authors hold that the syenogranite was formed in a post-orogenic setting. In the Middle Late Triassic period, the regional tectonic regime in Horqin Right Wing Middle Banner of Inner Mongolia underwent significant changes, and experienced as-thenosphere upwelling after squeezing into the orogenic lithosphere and thinning.
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致谢: 成文过程中中国科学院地质与地球物理研究所张旗研究员、天津地质矿产研究所李承东研究员、中国地质大学（北京）刘学飞博士、沈阳地质矿产研究所李之彤、王五力、郭胜哲研究员等悉心指导并提出了宝贵的建议，在此表示衷心的感谢。
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图 1 研究区地质略图
1—第四纪地层；2—中生代地层；3—上泥盆统-下石炭统色日巴彦敖包组；4—下寒武统杜尔基组；5—古元古界宝音图群；6—细粒二长岩；7—花岗班岩；8—细中粒（晶洞）碱长花岗岩；9—中粒正长花岗岩；10—巨晶（正长）花岗岩；11—似斑状细粒二长花岗岩；12—中粒二长花岗岩；13—似斑状粗中粒二长花岗岩；14—细中粒花岗闪长岩；15—细粒闪长岩；16—细（中）粒角闪辉长岩；17—橄榄岩；18—石英脉；19—酸性岩脉；20—中性岩脉；21—地质界线；22—断层；23—同位素年龄样品取样点
Figure 1. Geological sketch map of the study area
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图 2 敖兰三队侵入体宏观（a、b、c）及镜下特征（d，巨晶状微斜条纹长石）照片
Figure 2. Macroscopic(a~c) and endoscopic(d) photos of Aolansandui intrusion
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图 7 敖兰三队侵入体TW2187锆石U-Pb谐和图
Figure 7. TW2187 zircon U-Pb concordia diagram of Aolansandui intrusion
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图 8 敖兰三队侵入体（Zr+Nb+Ce+Y）-(Na2O+K2O)/CaO图解
FG—分异型I型花岗岩；OGT—I、S、M型花岗岩；A—A型花岗岩
Figure 8. (Zr+Nb+Ce+Y)-(Na2O+K2O)/CaO diagram of Aolansandui intrusion
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图 9 敖兰三队侵入体（Zr+Nb+Ce+Y）-TFeO/MgO图解
FG—分异型I型花岗岩；OGT—I、S、M型花岗岩；A—A型花岗岩
Figure 9. (Zr+Nb+Ce+Y)-TFeO/MgO diagram of Aolansandui intrusion
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图 12 敖兰三队侵入体（Y+Nb）-Rb（a）和（Yb+Ta）-Rb（b）构造判别图解
WPG—板内花岗岩；syn-COLG—同碰撞花岗岩；VAG—火山弧花岗岩；ORG—洋脊花岗岩
Figure 12. (Y+Nb)-Rb (a)and(Yb+Ta)-Rb(b) tectonic discrimination diagrams of Aolansandui intrusion
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图 13 敖兰三队侵入体花岗岩类构造环境判别图解
①—地幔斜长花岗岩；②—破坏性活动板块边缘（板块碰撞前）花岗岩；③—板块碰撞后隆起期花岗岩；④—晚造山期花岗岩；⑤—非造山环境A型花岗岩；⑥—同碰撞(S型)花岗岩；⑦—造山期后A型花岗岩
Figure 13. Granitoids tectonic discrimination diagrams of Aolansandui intrusion
表 1 敖兰三队侵入体主量、微量和稀土元素分析结果及特征参数
Table 1 Representative major, trace and REE data for the Aolansandui intrusion
样品编号 填图单位 岩性 SiO2 TiO2 Al2O3 Fe2O3 FeO MnO MgO CaO Na2O K2O P2O5 LOI Total Na2O+K2O K2O/Na2O D4082 ξγT3 巨晶正长花岗岩 73.71 0.10 14.11 0.95 0.64 0.05 0.09 0.19 4.19 4.93 0.05 0.53 99.53 9.12 1.18 PM210-6 ξγT3 巨晶正长花岗岩 75.62 0.15 11.80 2.35 1.37 0.03 0.23 0.30 2.98 5.57 0.04 0.77 101.21 8.55 1.87 WL2187 ξγT3 巨晶正长花岗岩 76.65 0.13 11.80 0.57 1.22 0.04 0.13 0.47 3.12 4.59 0.05 0.95 99.72 7.71 1.47 WL2239 ξγT3 巨晶正长花岗岩 73.93 0.16 13.16 0.88 1.58 0.04 0.21 0.37 3.23 5.47 0.08 0.53 99.65 8.70 1.69 PM208-73 ξγT3 巨晶正长花岗岩 75.38 0.13 12.55 2.44 0.75 0.02 0.13 0.16 2.94 5.25 0.13 0.70 100.57 8.19 1.79 样品编号 qz an ab or A P An% c il mt ∑ DI A/CNK SI AR R1 R2 D4082 30.03 0.59 35.8 29.45 63.88 1.96 28.73 1.68 0.19 1.11 100.01 95.27 1.123 0.86 3.83 2246 304 PM210-6 35.1 1.19 25.14 32.76 56.2 2.9 39.71 0.43 0.28 2.49 100 93.01 1.029 1.87 2.94 2565 274 WL2187 39.64 2.02 26.69 27.49 50.75 5.44 35.75 0.98 0.25 0.84 100 93.82 1.078 1.36 3.06 2908 292 WL2239 32.72 1.31 27.57 32.61 58.12 3.37 37.59 1.46 0.3 1.29 100.01 92.9 1.105 1.88 2.83 2449 311 PM208-73 37.32 0.00 24.89 31.12 56.01 0 0 2.04 0.25 2.07 100.02 93.34 1.162 1.13 2.72 2670 270 样品编号 La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu (La/Yb)N δEu REE D4082 37.26 98.12 11.57 44.72 10.36 0.45 10.01 1.90 12.58 2.59 7.50 1.18 6.85 1.00 3.67 0.14 246.08 PM210-6 112.93 189.29 29.92 101.38 24.88 0.37 20.33 4.79 28.03 6.30 18.07 2.57 13.75 1.85 5.54 0.05 554.47 WL2187 37.12 80.89 9.89 37.98 8.21 0.59 7.73 1.39 8.41 1.72 5.10 0.89 5.07 0.70 4.94 0.22 205.67 WL2239 25.25 60.12 7.00 28.25 7.01 0.67 6.90 1.38 9.71 2.04 6.06 1.09 6.48 0.90 2.62 0.30 162.85 PM208-73 119.54 182.91 30.37 103.21 26.25 0.28 20.34 5.22 32.17 7.03 20.36 3.18 17.94 2.45 4.49 0.04 571.26 样品编号 Ba Rb Sr Y Zr Th U Nb Ta Ni V Cr Co Li Sr/Y Rb/Sr Rb/Ba D4082 181.06 198.93 44.34 73.85 99.89 12.10 3.08 10.24 1.11 4.51 8.06 16.68 1.86 5.37 0.60 4.49 1.10 PM210-6 214.06 209.13 43.34 168.49 185.71 18.71 2.26 13.35 3.98 7.04 2.98 17.81 4.08 26.43 0.26 4.83 0.98 WL2187 274.77 173.99 65.02 48.70 145.22 9.27 2.31 9.30 0.76 4.44 11.14 15.44 1.75 15.22 1.34 2.68 0.63 WL2239 347.96 192.16 71.24 55.29 108.69 8.84 3.11 9.43 0.70 7.23 12.47 16.71 2.97 20.30 1.29 2.70 0.55 PM208-73 204.17 294.88 46.32 184.51 155.05 18.50 4.26 14.57 8.56 3.05 4.89 8.13 3.46 28.11 0.25 6.37 1.44 注:样品均由沈阳地质调杳中心测试中心分析; 主量元素含量单位为％; 微量和稀土元素含量单位为10-6; qz—石英; an—钙长石; ab—钠长山；or—正长山; A—碱性长石; P—斜长石; An%—斜长石标号; c—刚玉分子; 11—钛铁矿; mt—磁铁矿; DI—分异指数；I一固结指数; AR—碱度率 
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表 2 敖兰三队侵入体锆石U-Th-Pb同位素分析结果
Table 2 Zircon U-Th-Pb isotopic analysis results of Aolansandui intrusion
点号 Pb/10-6 U/10-6 Th/10-6 同位素原子比值 年龄/Ma 232Th/238U 208Pb/206Pb 206Pb/238U 207Pb/235U 207Pb/206Pb 206Pb/238U 207Pb/235U 207Pb/206Pb 1 8 239 102 0.4269 0.0915 0.0346〈2〉 0.2484〈51〉 0.0520〈12〉 220土1 225±5 286±7 2 23 333 127 0.3817 1.2059 0.0346〈2〉 0.2440〈31〉 0.051〈7〉 219土2 222±3 247土3 3 27 797 180 0.2260 0.0756 0.0349〈3〉 0.2428〈21〉 0.0505〈6〉 221±2 221±2 217±3 4 4 111 72 0.6482 0.1306 0.0347〈3〉 0.2422〈107〉 0.0506〈23〉 220土2 220±10 222±10 5 2 63 33 0.5231 0.0979 0.0347〈3〉 0.2428〈153〉 0.0507〈30〉 220土2 221±14 226±13 6 13 366 224 0.6107 0.1320 0.0348〈2〉 0.2453〈33〉 0.051〈8〉 220土2 223±3 247±4 7 13 380 105 0.2757 0.0623 0.0347〈2〉 0.2438〈29〉 0.0510〈7〉 220土2 222±3 239土3 8 17 523 127 0.2431 0.0545 0.0348〈3〉 0.2438〈27〉 0.0509〈7〉 220土2 222±2 235土3 9 23 698 207 0.2966 0.0628 0.0348〈2〉 0.2428〈21〉 0.0507〈5〉 220土1 221±2 225±2 10 10 287 124 0.4316 0.1239 0.0348〈3〉 0.2434〈67〉 0.0507〈17〉 220土2 221±6 229±8 11 11 321 99 0.3074 0.0700 0.0347〈3〉 0.2422〈35〉 0.0506〈9〉 220土2 220±3 221±4 12 24 696 231 0.3316 0.0749 0.0349〈3〉 0.2456〈20〉 0.0510〈5〉 221±2 223±2 242±2 13 6 169 118 0.6999 0.1508 0.0346〈2〉 0.2439〈82〉 0.051〈17〉 219土1 222±7 245±8 14 20 565 285 0.5037 0.1249 0.0348〈2〉 0.2465〈28〉 0.0514〈6〉 220土2 224±3 258土3 15 14 213 128 0.6021 1.1998 0.0345〈3〉 0.2457〈61〉 0.0516〈14〉 219土2 223±6 267±7 16 3 71 40 0.5605 0.1414 0.0349〈3〉 0.2453〈132〉 0.0509〈28〉 221±2 223±12 237±13 17 6 175 102 0.5849 0.1557 0.0346〈2〉 0.2460〈69〉 0.0516〈15〉 219土1 223±6 269±8 18 50 707 318 0.4503 1.2738 0.0348〈3〉 0.2465〈18〉 0.0514〈5〉 221±2 224±2 257±2 19 5 148 77 0.5196 0.1196 0.0348〈2〉 0.2432〈68〉 0.0507〈15〉 220土2 221±6 227±7 20 6 180 97 0.5382 0.1056 0.0348〈2〉 0.2435〈53〉 0.0507〈11〉 221土1 221±5 228土5
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