LA-ICP-MS zircon U-Pb ages of adakitic rocks in Dongco area, Tibet, and their tectonic implications
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摘要:
班公湖-怒江缝合带是青藏高原的主要缝合带之一，其闭合时限还存在争议，制约了班公湖-怒江特提斯洋演化历史的研究。在班公湖-怒江缝合带洞错地区新识别出一套早白垩世晚期的粗安岩，LA-ICP-MS测得其锆石206Pb/238U年龄为102.0±1.9Ma，岩石高SiO2、Al2O3、富Na及高的Sr/Y值（25.2~42.2），贫Nb（11.1×10-6~16.6×10-6）、Y（11.7×10-6~18.3×10-6）和Yb（1.06×10-6~1.77×10-6），轻、重稀土元素分异明显，具有与埃达克质岩相似的地球化学特征，同时具有高Mg#的特点（Mg#=50.0~54.1）。认为洞错高Mg#埃达克质岩很可能是残留洋壳部分熔融上升过程中交代地幔的产物，形成于板内构造环境。由此推测，洞错早白垩世晚期埃达克质岩的形成与班公湖-怒江洋盆闭合后拉萨地块与羌塘地块碰撞有关，结合区域地质资料，认为班公湖-怒江特提斯洋闭合时限应该在102Ma之前。
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关键词:
- 西藏洞错 /
- 班公湖-怒江特提斯洋 /
- 粗安岩 /
- 埃达克质岩 /
- LA-ICP-MS锆石U-Pb年龄 /
- 残余洋壳熔融
Abstract:The Ban'gong Co-Nujiang suture zone is one of the main suture zones in the Tibetan Plateau. Its closure time has been controversial, which causes some restrictions to the study of the evolution of the Tibetan Plateau. This paper deals with the discovered trachyandesite which occurs in Bangong Co-Nujiang suture zone. LA-ICP-MS zircon U-Pb analyses suggest that the trachyandesite was formed at 102±1.9Ma, and that the volcanic rocks were formed in late Early Cretaceous. They are characterized by ada-kite-like rock:high Na content, SiO2, Al2O3, Mg# and high Sr/Y values(25.2~42.2), and low Nb(11.1×10-6~16.6×10-6), Y (11.7×10-6~18.3×10-6)and Yb(1.06×10-6~1.77×10-6) values. The differentiation between HREE and LREE is obvious. The authors hold that high Mg# adakite-like rock(Mg#=(50.0~54.1) resulted from the reaction between the rising melt of remnant oceanic crust and the mantle wedge. Therefore, the origin of Dongcuo adakitic-like rocks may be related to the collision between Lasha and Qiangtang blocks after the closure of the Bangong Co-Nujiang Ocean. Based on these data, the authors consider that Bangong Co-Nujiang Ocean had been closed before 102Ma.
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表 1 洞错粗安岩LA-ICP-MS锆石U-Th-Pb同位素分析结果
Table 1. LA-ICP-MS zircon U-Th-Pb isotope analytical results of trachyandesite from Dongco area
测点号 含量/10-6 Th/U 同位素比值(已扣除普通铅) 年龄/Ma 谐和度 Pb Th U 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/235U 1σ 206Pb/238U 1σ 1 1.53 300 284 1.06 0.298 0.026 0.097 0.007 0.003 0.000 17 1 36 2 38% 2 6.16 33.5 343 0.098 0.050 0.004 0.111 0.009 0.016 0.000 103 2 152 12 95% 3 2.71 82.9 132 0.626 0.059 0.033 0.117 0.042 0.016 0.002 104 16 103 14 92% 4 18.5 241 1016 0.237 0.047 0.002 0.108 0.005 0.016 0.000 104 2 103 4 99% 5 30.3 362 1936 0.187 0.053 0.003 0.112 0.007 0.016 0.000 101 3 116 10 93% 6 9.92 2378 3050 0.780 0.050 0.003 0.018 0.001 0.003 0.000 17 0 16 1 35% 7 4.52 14.6 274 0.054 0.055 0.005 0.112 0.011 0.016 0.000 99 3 176 18 91% 8 6.42 44.8 359 0.125 0.053 0.004 0.118 0.010 0.016 0.000 104 3 114 17 91% 9 3.49 128 163 0.789 0.061 0.012 0.116 0.016 0.016 0.001 103 6 110 9 91% 10 1.82 30.2 104 0.290 0.049 0.005 0.112 0.016 0.016 0.001 100 5 120 14 93% 11 3.76 113 184 0.612 0.049 0.011 0.108 0.022 0.016 0.001 103 6 97 21 98% 12 5.71 153 170 0.898 0.054 0.004 0.185 0.013 0.025 0.001 159 3 158 7 91% 13 4.54 111 137 0.816 0.054 0.005 0.180 0.017 0.025 0.001 161 6 161 10 95% 14 28.8 3898 1302 2.99 0.048 0.003 0.072 0.004 0.011 0.000 70 1 74 2 99% 15 2.88 83.1 106 0.784 0.155 0.019 0.355 0.044 0.016 0.001 103 6 204 20 0% 16 2.87 79.1 136 0.582 0.051 0.012 0.108 0.025 0.016 0.001 101 5 122 23 96% 17 35.2 5183 1585 3.270 0.044 0.006 0.066 0.008 0.011 0.001 69 4 69 6 93% 18 1.12 25.1 55.1 0.455 0.194 0.043 0.317 0.056 0.016 0.001 103 9 176 26 8% 19 52.6 8384 2012 4.17 0.047 0.010 0.072 0.015 0.011 0.001 70 7 72 11 99% 20 99.1 1233 5306 0.232 0.049 0.013 0.106 0.026 0.016 0.002 100 12 104 20 98% 
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表 2 洞错粗安岩主量、微量和稀土元素分析结果
Table 2. Major, trace and rare earth elements analyses of trachyandesite from Dongco area
样品编号 11DC-9 11DC-10 11DC-11 11DC-12 11DC-14 SiO2 59.82 60.54 60.79 59.88 64.98 TiO2 0.89 0.87 0.85 0.90 0.60 Al2O3 15.90 16.01 15.88 15.88 15.52 TFe2O3 5.50 5.45 5.57 6.16 4.26 MnO 0.06 0.07 0.07 0.06 0.05 MgO 2.36 2.65 2.81 2.98 2.13 CaO 6.00 5.57 5.50 5.70 3.36 Na2O 3.61 3.59 3.64 3.62 4.17 K2O 1.75 1.86 1.86 1.74 2.17 P2O5 0.31 0.30 0.30 0.30 0.17 烧失量 2.98 3.00 2.65 2.42 2.15 总量 99.18 99.91 99.92 99.64 99.56 Mg# 50.0 53.1 54.1 53.0 53.8 Sc 14.2 13.4 13.5 14.5 9.5 Ti 4933 4735 4746 4996 3412 V 97.8 95.6 93.5 101 71.5 Cr 95.1 85.9 82.0 96.8 54.4 Co 17.2 16.6 16.3 17.8 10.4 Ni 52.1 51.9 47.9 52.0 23.5 Ga 18.7 18.2 18.3 18.4 17.9 Ge 1.24 1.25 1.17 1.28 1.29 Rb 39.1 37.7 39.3 37.9 47.0 Sr 475 449 452 458 494 Y 18.3 16.9 17.3 17.7 11.7 Zr 231 227 232 231 199 Nb 16.6 16.5 16.3 16.5 11.1 Cs 1.54 1.05 1.19 1.16 0.68 Ba 427 405 425 393 664 La 29.9 29.9 29.8 28.7 30.2 Ce 57.9 57.0 57.0 55.5 52.4 Pr 6.96 6.92 6.83 6.66 6.20 Nd 26.1 25.2 25.1 24.9 22.2 Sm 4.69 4.48 4.56 4.44 3.59 Eu 1.34 1.28 1.30 1.27 1.05 Gd 4.35 4.05 4.09 4.04 3.18 Tb 0.61 0.60 0.58 0.58 0.42 Dy 3.44 3.30 3.24 3.31 2.16 Ho 0.70 0.66 0.66 0.68 0.42 Er 1.84 1.78 1.72 1.74 1.19 Tm 0.27 0.26 0.25 0.25 0.16 Yb 1.77 1.74 1.66 1.68 1.06 Lu 0.26 0.26 0.26 0.25 0.17 Hf 4.88 4.75 4.84 4.82 4.44 Ta 1.03 1.05 1.03 1.02 0.73 Pb 10.7 10.2 9.85 10.2 12.0 Th 5.01 5.00 4.96 4.78 5.38 U 1.15 1.19 1.19 1.07 1.17 ΣREE 509 498 496 486 429 注：主量元素含量单位为%，微量和稀土元素单位为10-6
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