Petrogenesis and tectonic significance of the early Late Triassic magmatism of the northern Altaid orogenic belt
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摘要:
对阿尔泰造山带北段南缘出露的塔尔萨依岩体二云母正长花岗岩进行了LA-ICP-MS锆石U-Pb定年, 获得其 206Pb/238U年龄加权平均值为235±2 Ma(MSWD=0.46), 表明该花岗岩为晚三叠世早期岩浆活动的产物。全岩地球化学分析结果显示, 塔尔萨依岩体的二云母正长花岗岩和二云母二长花岗岩均具有高硅、高钾、低镁、低钛特征, 里特曼指数(σ)和铝饱和指数(A/CNK)分别大于2和1.1, 为高钾钙碱性强过铝质花岗岩。此外, 两类花岗岩均富集轻稀土元素和Rb、Th等微量元素, 亏损高场强元素Nb、Ta、Yb和Y。其低的Mg#值、Cr和Ni含量, 以及中等的CaO/Na2O和低的Al2O3/TiO2值, 表明研究区花岗岩形成于同碰撞构造环境。结合前人已有研究成果, 认为阿尔泰造山带三叠纪的构造体制转变在时空上存在差异, 整体表现出东—中段由挤压环境进入伸展构造背景的时间较北部早的趋势。
Abstract:LA-ICP-MS zircon U-Pb dating for the two-mica syenogranite of Talsayi pluton in the southern margin of the northern Altaid orogenic belt yielded a 206Pb/238U age of 235±2 Ma(MSWD=0.46), which interpreted as product of the early Late-Triassic magmatic event.Whole-rock geochemical data show that two-mica syenogranite and two-mica monzogranite of the Talsayi pluton are characterized by high silicon and alkali, low titanium and magnesium, as well as large Rittmann Index and Aluminum Saturation Index(A/CNK)values.The lines of evidence indicate that the granitic rocks are classified into high potassium calc-alkaline peraluminous granitic series.In addition, the syenogranite and monzogranite are relatively enriched in light rare earth elements(LREE), as well as trace elements of Rb and Th, but depleted in high field-strength elements of Nb, Ta, Yb and Y, in addition, the granitic rocks show low values of magnesium and contents of Cr and Ni, and moderate values of CaO/Na2O and low values of Al2O3/TiO2.These suggest that the Talsayi pluton in the southern margin of the northern Altaid orogenic belt were formed in the syn-collision tectonic environment.Combination with the previous studies, it is proposed that the transition of tectonic regime of the Altaid orogenic belt show spatiotemporal difference with characteristic of trending from east and central to north direction during Triassic era.
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图 4 造山带北段塔尔萨依地区二云母正长花岗岩和二云母二长花岗岩稀土元素球粒陨石标准化分布模式图(a) 和微量元素原始地幔标准化蛛网图(b)(标准值据参考文献[35])
Figure 4.
图 6 阿尔泰造山带北段塔尔萨依地区二云母正长花岗岩和二云母二长花岗岩(Yb+Nb)-Rb(a)和(Yb+Ta)-Rb(b)构造环境判别图解(据参考文献[39]修改)
Figure 6.
表 1 阿尔泰造山带北段三叠纪二云母正长花岗岩(D1212)LA-ICP-MS锆石U-Th-Pb同位素分析结果
Table 1. LA-ICP-MS zircon U-Th-Pb analytical results of the Triassic two-mica syenogranite from the northern Altaid orogenic belt
测点号 含量/10-6 Th/U 同位素比值 年龄/Ma Pb* Th U 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 208Pb/232Th 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 208Pb/232Th 1σ 1 99 339 2430 0.14 0.05012 0.00068 0.25644 0.00566 0.03707 0.00066 0.01188 0.00059 211 31 232 5 235 4 239 12 2 72 301 1756 0.17 0.05095 0.00071 0.25589 0.00563 0.03639 0.00066 0.01220 0.00061 239 64 231 5 230 4 245 12 3 59 252 1397 0.18 0.05036 0.00078 0.25466 0.00417 0.03668 0.00040 0.01118 0.00059 213 40 230 3 232 3 225 12 4 354 23859 3168 7.53 0.05071 0.00086 0.25818 0.00768 0.03705 0.00112 0.01559 0.00175 228 39 233 6 235 7 313 35 5 73 357 1697 0.21 0.05041 0.00080 0.26108 0.00488 0.03756 0.00047 0.01154 0.00071 213 37 236 4 238 3 232 14 6 89 314 2176 0.14 0.04997 0.00058 0.25551 0.00464 0.03704 0.00052 0.01095 0.00060 195 28 231 4 234 3 220 12 7 92 474 2193 0.22 0.04896 0.00062 0.25089 0.00362 0.03720 0.00044 0.01084 0.00055 146 27 227 3 235 3 218 11 8 70 208 1678 0.12 0.05200 0.00073 0.26708 0.00444 0.03725 0.00043 0.01141 0.00057 287 31 240 4 236 3 229 11 9 62 209 1483 0.14 0.05019 0.00066 0.26224 0.00523 0.03781 0.00051 0.01109 0.00055 211 31 236 4 239 3 223 11 10 83 334 1996 0.17 0.05119 0.00071 0.26039 0.00369 0.03694 0.00047 0.01029 0.00058 250 31 235 3 234 3 207 12 11 150 413 3698 0.11 0.05111 0.00069 0.25918 0.00435 0.03683 0.00053 0.01079 0.00062 256 31 234 4 233 3 217 12 12 68 298 1636 0.18 0.05104 0.00072 0.26253 0.00465 0.03728 0.00043 0.01077 0.00057 243 33 237 4 236 3 217 11 13 55 204 1346 0.15 0.05157 0.00069 0.26131 0.00419 0.03678 0.00046 0.01058 0.00054 265 31 236 3 233 3 213 11 14 76 264 1938 0.14 0.05352 0.00121 0.27413 0.01053 0.03687 0.00074 0.01341 0.00098 350 84 246 8 233 5 269 20 15 79 363 1916 0.19 0.05054 0.00064 0.25930 0.00466 0.03718 0.00049 0.01067 0.00056 220 32 234 4 235 3 214 11 
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表 2 阿尔泰造山带北段三叠纪二云母正长花岗岩和二云母二长花岗岩主量、微量和稀土元素地球化学分析结果
Table 2. Major, trace and rare earth elements geochemical data of the Triassic two-mica syenogranite and two-mica monzogranite, northern Altaid orogenic belt
岩性 二云母正长花岗岩 二云母二长花岗岩 样品号 D1212-1 D1212-2 D1212-3 D1212-4 D1212-5 D1212-6 GPS坐标 93°45′32″E 93°45′35″E 93°45′51″E 93°45′25″E 93°45′18″E 93°45′39″E 63°56′47″N 63°56′29″N 63°56′35″N 63°56′51″N 63°56′40″N 63°56′59″N SiO2 71.98 74.16 71.64 73.33 72.89 72.69 TiO2 0.11 0.08 0.21 0.13 0.14 0.16 Al2O3 15.46 14.94 15.77 14.27 14.65 14.19 Fe2O3 0.24 0.19 0.33 0.50 0.54 1.09 FeO 1.17 0.94 1.47 0.96 0.97 0.92 MnO 0.02 0.02 0.03 0.03 0.03 0.05 MgO 0.10 0.00 0.27 0.20 0.22 0.22 CaO 1.07 0.90 1.27 1.22 1.21 1.19 Na2O 4.01 3.39 3.82 2.88 2.82 2.72 K2O 4.70 4.64 4.09 5.11 5.09 5.10 P2O5 0.06 0.04 0.12 0.12 0.13 0.15 烧失量 0.20 0.16 0.22 0.50 0.59 0.61 总量 99.12 99.46 99.24 99.25 99.28 99.09 La 16.90 15.80 46.70 30.90 33.50 36.80 Ce 30.30 28.40 81.60 54.10 57.40 64.50 Pr 3.48 3.28 9.41 6.13 6.79 7.28 Nd 11.80 11.20 32.60 21.80 23.10 25.90 Sm 2.29 2.15 4.95 4.47 4.43 4.71 Eu 0.60 0.55 0.86 0.89 0.98 0.90 Gd 1.78 1.50 3.54 3.31 3.61 3.87 Tb 0.22 0.22 0.42 0.49 0.49 0.54 Dy 0.94 0.84 1.56 1.97 2.09 2.27 Ho 0.19 0.18 0.31 0.42 0.40 0.45 Er 0.52 0.44 0.74 1.17 0.95 1.17 Tm 0.06 0.07 0.11 0.16 0.12 0.15 Yb 0.39 0.34 0.60 0.92 0.85 0.86 Lu 0.04 0.06 0.09 0.12 0.10 0.13 Y 5.51 4.97 9.08 13.6 12.9 13.7 Sr 97.8 113.5 165.1 141.1 127.3 123 Ba 229 279 506 529 538 491 Rb 175 170 185 175 175 181 Th 9.58 8.3 24.9 17 18.9 22 Pb 44.5 43.6 41.3 71.5 47.3 47.8 Zr 46.1 49.3 107.9 78.6 75.6 88.3 Nb 11.8 13.9 11 14.1 15.4 15 Ta 1.14 1.18 0.98 0.9 1.29 1.19 Cr 4.2 4.2 5.7 7.6 6.4 6.2 Ni 10.7 3.57 6.8 10.8 5.44 5.16 δEu 0.30 0.31 0.21 0.23 0.25 0.21 δCe 3.95 3.95 3.89 3.93 3.81 3.94 ∑REE 69.51 65.03 183.49 126.85 134.81 149.53 注：主量元素含量单位为%，微量和稀土元素含量单位为10-6
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