Geochemistry, Zircon U-Pb Dating and Hf Isotope Compositions of Early Cretaceous Magmatic Rocks in Yongzhu Area, Northern Lhasa Terrane, Tibet, and Its Geological Significance
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摘要: 拉萨地体北部出露大面积早白垩世岩浆岩,对它们的成因和形成机制的研究,有助于揭示拉萨地块白垩纪时期的岩浆作用过程及动力学背景.通过岩石学、地球化学和同位素地质学方法对拉萨地体北带永珠地区早白垩世中-酸性岩浆岩进行了研究.结果显示黑云母二长花岗岩、流纹岩和安山岩的锆石LA-ICP-MS U-Pb年龄分别为118±1.0 Ma、121±0.8 Ma和115±0.8 Ma,代表了其侵入和喷出时代.黑云母二长花岗岩、花岗斑岩和流纹岩为高钾钙碱性过铝质-强过铝质岩浆岩(A/CNK=1.01~1.35),亏损高场强元素Nb、P、Ti和大离子亲石元素Ba、Sr,富集大离子亲石元素Rb、K和放射性元素U、Th;稀土配分图显示LREE富集,HREE近平坦,Eu明显负异常,为形成于大陆边缘的岛弧岩浆岩特征.黑云母二长花岗岩和流纹岩的锆石Hf初始比值εHf(t)分别为-1.21~3.01和-0.68~5.35,对应的两阶段模式年龄分别为0.99~1.26 Ga和0.84~1.22 Ga,为壳幔混源岩浆.安山岩为高钾钙碱性,亏损Nb、Ta、P、Ti、U和Sr,富集Rb、K和Th,稀土配分图显示LREE富集,HREE近平坦,Eu轻微负异常,为形成于大陆边缘弧的岩浆岩.结合前人研究成果,分析认为永珠地区早白垩世岩浆岩形成于班公湖-怒江特提斯洋壳南向俯冲作用下的大陆边缘弧环境,由俯冲的班公湖-怒江中特提斯洋板片在深部脱水熔融,进而诱发上覆地幔楔部分熔融形成基性岩浆上涌,导致下地壳物质发生部分熔融形成酸性岩浆,它们在上升过程中按不同比例混合,形成中性和酸性岩浆侵入到地下或喷出地表,形成侵入岩和火山岩.Abstract: The study on the petrogenesis and tectonic setting of the Early Cretaceous magmatic rocks in the northern Lhasa is important to define the geodynamic evolution for the Lhasa terrane. In this paper, it is reported of petrology, petrogeochemistry, zircon U-Pb ages and zircon Hf isotopic comopositions of Early Cretaceous magmatic rocks from Yongzhu area in the northern Lhasa terrane. Zircon U-Pb ages for biotite-monzonitic granite, rhyolite and andesite are 118±1.0 Ma, 121±0.8 Ma and 115±0.8 Ma respectively, representing their intrusion and eruption period. Biotite-monzonitic granite, granite porphyry and rhyrolite show similar geochemical characteristics. They are high K calc-alkaline and weakly peraluminous-strongly peraluminous granites (A/CNK=1.01-1.35). In primitive mantle-normalized spider diagrams, these rocks are characterized by enriched large ion lithophile elements Rb, K and radioactive elements U, Th, and negative anomalies in Nb, P, Ti, Ba and Sr. Chondrite-normalized REE patterns show that these rocks are enriched in LREE, nearly flat HREE and negative Eu anomalies. Above chemical natures suggest that they are island-arc igneous rocks and formed in continental margin arc setting. The Hf isotopic compositions in the biotite-monzonitic granite and rhyolite are -1.21 to 3.01 and -0.68 to 5.35, respectively, and two stage model ages are 0.99-1.26 Ga and 0.84-1.22 Ga, respectively, which suggests mixed source of crust and mantle. In contrast, the andesite shows slightly different geochemical characteristics. They are characterized by (1) high K calc-alkaline; (2) negative anomalies in Nb, Ta, P, Ti, U and Sr, and enrichment of Rb, K and Th in primitive mantle-normalized spider diagrams; (3) chondrite-normalized REE patterns show that these rocks are enriched in LREE, nearly flat HREE, and slight negative Eu anomalies; (4) formation in the continental margin arc setting. It is proposed that the Early Cretaceous magmatic rocks in Yongzhu were formed in the continental margin arc setting. During southern subduction of Bangonghu-Nujiang Tethyan oceanic basin, dehydration melting of the subduction oceanic plate produced the high thermal molten mass, which induced partial melting of the mantle wedge and formation of mafic magma. Then upwelling of mafic magma induced partial melting of the lower crust material and formation of acidic magma. During ascent process of the mafic magma and acidic magma, the two types of magma mixed in different proportion, and formed volcanic and plutonic rocks.
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Key words:
- Early Cretaceous magmatic rock /
- geochemistry /
- zircon U-Pb age /
- Yongzhu area
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图 1 青藏高原大地构造简图(a)、拉萨地体白垩世岩浆岩分布图(b)和研究区区域地质简图(c)
图a据Zhu et al., 2013;图b据Zhu et al., 2011;图c据曲永贵等,2003;1:25万多巴区幅区域地质图;陈玉禄等,2002;1:25万班戈县幅区域地质图.图a:JSSZ.金沙江缝合带;BNSZ.班公湖-怒江缝合带;SNMZ.狮泉河-纳木错混杂岩带;LMF.洛巴堆-米拉山断裂;IYZSZ.印度河-雅鲁藏布江缝合带;NL.北拉萨地体;CL.中拉萨地体;SL.南拉萨地体;LSSZ.龙木措-双湖缝合带;图c年龄数据来源:(1)曲晓明等,2012;(2)张乐,2015;(3)定立等,2012;(4)高顺宝等, 2011a, 2011b;(5)王江朋等,2012;(6)Zhu et al., 2016;(7)黄瀚霄等,2012;(8)Zhu et al., 2011;(9)本文
Fig. 1. Tectonic framework for the Tibetan Plateau (a), the Cretaceous igneous rocks of the Lhasa terrane (b), and the regional geological map of survey region (c)
图 4 K2O+Na2O-SiO2火山岩分类命名图(a),K2O-SiO2钙碱性判别图(b)和A/NK-A/CNK图解(c)
图a据Rickwood(1989);图b据Peccerillo and Taylor(1976);图c据Maniar and Piccoli(1989)
Fig. 4. K2O+Na2O-SiO2 volcanics classification diagram (a), K2O-SiO2 calc-alkaline discriminant diagram (b) and A/NK-A/CNK diagram (c)
图 5 岩浆岩稀土元素球粒陨石标准化配分模式(a, c)和微量元素原始地幔标准化蛛网图(b, d)
Fig. 5. Chondrite-normalized REE patterns (a, c) and primitive mantle-normalized trace element spider diagrams (b, d) for the magmatic rocks
图 9 永珠地区岩浆岩Y-Zr (a)、Zr/Al2O3-TiO2/Al2O3 (b)、Th/Yb-Ta/Yb (c)、La/Yb-Sc/Ni (d)构造判别图解
图a, b据Muller and Groves(1994);图c据Gorton and Schandl(2000);图d据Pearce(1982)
Fig. 9. Y-Zr (a), Zr/Al2O3-TiO2/Al2O3 (b), Th/Yb-Ta/Yb (c) and La/Yb-Sc/Ni (d) discrimination diagrams of tectonic setting for magmatic rocks of Yongzhu region
图 10 永珠地区岩浆岩εHf(t)-U-Pb年龄
北拉萨、中拉萨和南拉萨地体数据引自Zhu et al.(2011, 2016);南羌塘地体数据引自Li et al.(2013b, 2014a, 2016); Fan et al.(2015)
Fig. 10. Plots of εHf(t) vs. U-Pb ages diagram for the magmatic rocks of Yongzhu region
图 11 永珠地区岩浆岩Yb/Ta-Y/Nb图解(a)和TFeO-MgO成因判别图(b)
图a数据来源:BBC.平均大陆地壳(Rudnick and Gao, 2003);LCC.大陆下地壳(Rudnick and Gao, 2003);DMM.亏损地幔(Salters and Stracke, 2004);图b据Zorpi et al., 1991
Fig. 11. Yb/Ta-Y/Nb (a) and TFeO-MgO (b) discrimination diagrams of petrogenesis for magmatic rocks of Yongzhu region
表 1 全岩主量元素(%),稀土和微量元素(10-6)化学成分分析结果
Table 1. The major elements (%), REE and trace elements (10-6) of total rock chemical compositions for the magmatic rocks
岩性 黑云母二长花岗岩 花岗斑岩 达过流纹岩 达过南流纹岩 安山岩 样号 16QX
S-216QX
S-316QX
S-416QX
S-516QX
S-616QX
S-4216QX
S-4316QX
S-4416QX
S-4516QX
S-4616QX
S-1816QX
S-1916QX
S-2016QX
S-2116QX
S-2216QX
S-3016QX
S-3116QX
S-3216QX
S-3316QX
S-3413-D
B-6713-D
B-6913-D
B-7013-D
B-7113-D
B-72SiO2 72.91 72.37 72.00 72.65 73.06 74.59 74.66 74.26 74.49 75.00 77.55 76.68 76.70 76.40 76.91 73.43 70.36 72.79 73.82 73.79 57.37 58.45 58.22 57.94 58.29 TiO2 0.20 0.23 0.22 0.23 0.22 0.17 0.18 0.17 0.18 0.17 0.20 0.22 0.20 0.22 0.20 0.25 0.48 0.25 0.25 0.26 0.53 0.63 0.66 0.6 0.57 Al2O3 14.25 14.39 14.47 14.13 13.70 12.51 12.84 12.57 12.63 12.56 13.05 13.47 13.38 13.54 13.16 12.67 13.93 12.47 12.64 12.71 16.34 15.88 16.69 15.50 16.43 Fe2O3 0.73 0.92 0.80 0.90 0.79 1.19 1.37 1.14 1.44 1.19 0.05 0.02 0.02 0.02 0.02 1.48 2.25 1.18 0.75 1.14 1.58 1.33 1.46 1.58 1.59 FeO 0.86 0.83 1.11 1.04 1.19 0.75 0.68 0.75 0.47 0.68 0.22 0.40 0.25 0.22 0.20 1.19 2.12 1.51 1.11 1.15 4.49 4.99 4.85 4.60 4.89 MnO 0.03 0.03 0.03 0.03 0.03 0.03 0.02 0.03 0.03 0.02 0.01 0.01 0.01 0.01 0.01 0.04 0.04 0.04 0.03 0.04 0.12 0.12 0.11 0.13 0.11 MgO 0.68 0.84 0.86 0.85 0.84 0.19 0.22 0.18 0.15 0.18 0.12 0.09 0.08 0.08 0.08 0.36 0.61 0.33 0.36 0.36 4.43 4.70 4.52 4.43 4.70 CaO 1.90 1.87 2.07 2.05 1.92 0.90 0.63 1.07 0.78 0.72 0.31 0.23 0.28 0.21 0.17 0.81 0.50 1.54 1.17 0.98 4.85 4.31 2.70 6.17 3.01 Na2O 3.79 3.89 3.86 3.77 3.54 2.82 2.75 3.09 3.06 2.99 2.92 3.20 3.15 3.29 3.19 3.37 3.97 3.27 3.29 3.22 3.65 2.86 2.29 3.50 3.67 K2O 3.54 3.63 3.38 3.28 3.40 4.71 4.78 4.60 4.80 4.62 3.93 4.17 4.57 4.53 4.60 4.05 3.46 3.96 4.09 4.15 2.88 1.98 3.77 1.01 2.01 P2O5 0.04 0.06 0.05 0.06 0.05 0.01 0.02 0.02 0.02 0.01 0.03 0.03 0.02 0.02 0.02 0.07 0.15 0.06 0.06 0.06 0.09 0.12 0.12 0.11 0.11 H2O+ 0.62 0.90 0.58 0.76 0.74 1.24 1.12 1.16 1.10 0.98 1.18 1.08 1.04 1.08 0.94 1.40 1.78 1.46 1.42 1.24 2.96 4.50 3.66 3.36 4.06 CO2 0.10 0.10 0.10 0.10 0.12 0.29 0.21 0.34 0.21 0.21 0.12 0.1 0.12 0.10 0.10 0.21 0.21 0.45 0.31 0.31 0.58 0.08 0.92 0.42 0.58 LOI 0.47 0.66 0.60 0.52 0.68 1.57 1.40 1.63 1.46 1.36 1.15 1.07 1.06 1.00 0.96 1.74 1.68 2.09 1.86 1.73 2.87 3.55 3.47 3.47 3.69 A/NK 1.41 1.39 1.44 1.45 1.44 1.28 1.32 1.25 1.23 1.24 1.44 1.38 1.32 1.31 1.29 1.27 1.35 1.29 1.28 1.30 1.79 2.32 2.12 2.26 2.00 A/CNK 1.05 1.05 1.05 1.05 1.05 1.10 1.18 1.05 1.08 1.12 1.35 1.32 1.26 1.26 1.25 1.11 1.24 1.01 1.05 1.10 0.91 1.08 1.31 0.86 1.20 Fe2O3T 1.68 1.83 2.02 2.04 2.10 1.99 2.10 1.94 1.93 1.92 0.29 0.46 0.29 0.26 0.24 2.75 4.53 2.80 1.95 2.37 6.38 6.64 6.62 6.46 6.77 FeOT 1.51 1.65 1.82 1.84 1.89 1.79 1.89 1.75 1.74 1.73 0.26 0.41 0.27 0.24 0.22 2.48 4.08 2.52 1.75 2.14 5.75 5.97 5.96 5.82 6.10 σ 1.79 1.92 1.80 1.67 1.59 1.78 1.78 1.88 1.95 1.80 1.35 1.61 1.76 1.82 1.78 1.79 2.00 1.74 1.75 1.75 2.80 1.41 2.27 1.27 1.97 Mg# 44.4 47.5 45.6 45.0 44.1 15.7 17.0 15.3 13.2 15.5 44.7 27.7 34.7 37.5 39.5 20.3 20.8 18.6 26.4 22.8 57.2 57.5 56.7 56.7 57.0 La 20.9 16.2 17.4 24.6 18.9 50.9 42.1 53.1 48.9 47.1 53.3 53 34.8 49.2 43.1 56.4 57.9 51.9 46.3 48.5 23.6 23.6 16.9 23.1 21.1 Ce 40.1 31.7 33.7 48.0 36.8 102 94.7 103.0 100.0 100.0 101.0 91.0 55.6 73.3 72.5 112.0 114.0 101.0 91.6 94.8 43.7 47.7 35.9 46.5 42.7 Pr 4.38 3.50 3.72 5.21 4.04 12.50 10.50 12.80 11.80 11.60 12.80 12.90 8.55 11.50 10.40 14.00 14.90 12.70 11.50 11.90 4.81 5.29 4.07 5.30 4.83 Nd 15.0 12.7 13.2 18.0 14.6 48.8 41.0 50.3 46.1 44.7 49.6 49.5 32.3 44.8 39.9 56.3 61.2 50.4 45.9 47.2 18.6 20.4 15.9 20.2 18.2 Sm 2.85 2.70 2.86 3.55 2.99 10.10 8.58 10.20 9.28 9.29 10.10 9.94 6.52 8.70 7.85 11.40 12.80 10.40 9.46 9.76 3.47 3.89 3.26 3.84 3.62 Eu 0.50 0.52 0.52 0.53 0.48 0.98 0.89 0.99 0.95 0.90 0.99 1.01 0.79 1.02 0.86 1.55 1.87 1.47 1.32 1.35 1.24 0.97 0.76 0.86 0.77 Gd 2.60 2.63 2.86 3.14 2.95 9.80 8.96 10.40 9.29 9.22 9.82 10.00 6.34 8.07 7.52 11.40 13.00 10.50 9.43 10.00 3.42 4.12 3.19 3.67 3.61 Tb 0.44 0.47 0.51 0.52 0.51 1.71 1.62 1.80 1.60 1.60 1.68 1.70 1.17 1.37 1.37 1.84 2.17 1.76 1.63 1.78 0.56 0.69 0.50 0.61 0.58 Dy 2.48 2.76 3.20 3.18 3.09 10.50 10.40 11.10 10.20 9.94 10.50 10.50 7.88 8.66 8.78 11.00 13.10 10.70 10.20 11.20 3.13 4.01 2.91 3.45 3.27 Ho 0.47 0.53 0.63 0.60 0.59 2.06 2.07 2.17 2.00 1.97 2.07 2.03 1.68 1.73 1.78 2.15 2.55 2.08 2.00 2.21 0.62 0.82 0.57 0.69 0.69 Er 1.39 1.63 1.94 1.84 1.84 6.16 6.43 6.64 6.22 6.01 6.30 6.17 5.53 5.32 5.56 6.45 7.79 6.27 6.13 6.64 1.80 2.31 1.72 1.92 1.95 Tm 0.21 0.26 0.31 0.28 0.29 0.93 0.96 1.01 0.95 0.91 0.94 0.91 0.86 0.79 0.84 0.98 1.17 0.94 0.94 1.00 0.27 0.35 0.24 0.28 0.29 Yb 1.47 1.66 2.01 1.82 1.86 5.81 6.07 6.26 6.02 5.74 5.84 5.46 5.41 4.94 5.15 6.18 7.30 6.06 5.83 6.31 1.75 2.20 1.74 1.90 1.92 Lu 0.23 0.26 0.31 0.29 0.29 0.87 0.92 0.96 0.90 0.86 0.88 0.82 0.82 0.73 0.77 0.94 1.10 0.93 0.89 0.98 0.27 0.32 0.26 0.29 0.29 ∑REE 93.0 77.5 83.2 111.6 89.2 263.1 235.2 270.7 254.2 249.8 265.8 254.9 168.3 220.1 206.4 292.6 310.9 267.1 243.1 253.6 107.2 116.7 87.9 112.5 103.7 LREE/HREE 7.41 6.65 7.74 9.23 7.65 20.00 20.31 21.27 21.03 19.92 20.41 17.82 17.91 17.05 17.88 20.75 22.23 20.18 19.45 20.92 8.07 6.88 6.89 7.79 7.24 δEu 0.55 0.58 0.55 0.47 0.49 0.30 0.31 0.29 0.31 0.29 0.30 0.31 0.37 0.37 0.34 0.41 0.44 0.43 0.42 0.41 1.09 0.74 0.71 0.69 0.64 (La/Sm)N 7.98 6.53 6.62 7.54 6.88 5.48 5.34 5.66 5.73 5.51 5.74 5.8 5.81 6.15 5.97 5.38 4.92 5.43 5.32 5.41 7.39 6.61 5.62 6.54 6.34 (Gd/Yb)N 1.93 1.73 1.56 1.89 1.73 1.84 1.61 1.82 1.69 1.76 1.84 2.00 1.28 1.79 1.60 2.02 1.95 1.90 1.77 1.73 2.14 2.05 2.00 2.11 2.05 Rb 165 179 186 171 182 221 220 217 238 218 183 203 218 220 223 198 177 196 195 207 100 83 167 35 89 Ba 378 510 401 355 390 394 389 399 424 378 569 465 579 518 522 459 388 452 422 449 640 310 819 895 224 Th 16.0 13.7 16.3 16.1 15.9 28.3 28.3 29.6 29.1 28.9 31.1 27.2 31.8 26.6 29.1 26.1 24.6 25.5 25.1 25.4 14.0 10.6 7.7 7.5 10.2 U 2.61 2.38 3.50 2.45 2.84 3.92 4.02 4.36 4.07 3.87 4.82 4.06 4.02 3.49 3.87 4.89 5.06 4.77 4.79 4.79 0.90 1.22 0.69 0.84 0.94 Nb 6.33 7.27 7.52 7.38 7.33 14.10 14.70 14.80 15.00 14.30 16.60 16.30 16.70 16.10 16.20 14.90 16.70 14.50 13.90 14.50 5.47 7.42 6.34 6.80 6.30 Ta 0.89 1.08 1.15 1.02 1.08 1.40 1.48 1.52 1.51 1.43 1.65 1.53 1.67 1.53 1.61 1.38 1.43 1.37 1.31 1.34 0.43 0.54 0.46 0.52 0.50 Sr 104.0 111.0 110.0 108.0 101.0 30.1 25.9 31.4 30.9 25.2 21.9 20.7 28.4 26.6 23.3 38.9 54.7 49.6 37.2 37.2 105.0 108.0 150.0 62.4 148.0 Zr 75 89 89 82 81 296 302 321 321 289 364 393 397 391 358 409 515 393 378 392 116 83 92 104 124 Hf 3.04 3.60 3.62 3.30 3.33 9.45 9.98 10.40 10.60 9.50 11.60 11.90 12.20 11.90 11.40 11.90 13.90 11.50 11.10 11.30 3.20 2.70 2.30 2.70 3.10 Y 13.5 15.3 18.7 17.2 17.5 54.3 53.7 61.9 53.7 52.2 54.6 54.1 45.3 44.9 46.2 57.8 69.3 55.8 53.5 61.7 16.4 20.1 15.1 15.6 16.7 Sc 4.18 4.74 5.11 4.96 5.34 4.36 4.73 4.65 4.77 4.68 3.91 4.37 3.94 3.48 3.51 6.92 12.20 7.12 6.69 7.55 25.12 24.72 22.77 27.21 25.32 Ni 5.28 6.52 6.66 6.31 6.23 2.18 2.16 0.93 3.56 2.44 0.65 1.36 0.96 1.03 1.75 4.34 2.21 1.71 1.24 1.43 14.60 13.40 15.10 14.9 15.00 注:测试单位为国家地质测试中心. 表 2 黑云母二长花岗岩、流纹岩与安山岩LA-ICP-MS锆石U-Pb定年结果
Table 2. LA-ICP-MS zircon U-Pb dating results for the biotite-monzonitic granites, rhyolites and andesites
测点 Pb
(10-6)Th
(10-6)U
(10-6)Th/U 同位素 年龄(Ma) 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 206Pb/238U 1σ 16QXS-2,雄梅黑云母二长花岗岩,北纬:31°24′1.2″,东经:89°00′25.8″ 1 205 1 970 1 841 1.1 0.092 7 0.004 5 0.227 3 0.010 9 0.017 8 0.000 2 114 1.4 2 270 2 709 2 768 1.0 0.047 9 0.001 5 0.125 7 0.004 2 0.019 0 0.000 3 121 1.6 3 99 1 089 1 254 0.9 0.050 0 0.002 4 0.126 2 0.006 2 0.018 2 0.000 2 116 1.3 4 229 2 527 2 176 1.2 0.046 8 0.001 7 0.119 8 0.004 4 0.018 6 0.000 2 119 1.5 5 30 262 539 0.5 0.060 0 0.003 6 0.153 1 0.009 3 0.018 7 0.000 3 119 1.9 6 59 536 948 0.6 0.048 2 0.002 4 0.119 9 0.005 9 0.018 2 0.000 3 116 1.9 7 62 595 870 0.7 0.048 5 0.002 6 0.123 6 0.006 3 0.018 7 0.000 3 120 1.8 8 33 294 484 0.6 0.060 8 0.003 6 0.159 1 0.009 5 0.018 9 0.000 3 120 2.1 9 86 602 1101 0.6 0.077 8 0.005 3 0.227 1 0.019 0 0.020 2 0.000 3 129 2.2 10 36 328 641 0.5 0.057 0 0.004 1 0.141 3 0.009 1 0.018 2 0.000 3 116 1.9 11 101 1 080 1 189 0.9 0.048 5 0.002 3 0.124 7 0.005 6 0.018 9 0.000 3 121 1.8 12 196 1 873 2 289 0.8 0.053 5 0.002 1 0.144 9 0.006 5 0.019 3 0.000 3 123 1.9 13 76 747 1 020 0.7 0.049 8 0.002 6 0.126 8 0.006 5 0.018 6 0.000 3 119 1.6 14 190 1 953 2 415 0.8 0.049 9 0.002 3 0.126 7 0.005 8 0.018 3 0.000 2 117 1.5 15 245 2 639 2 538 1.0 0.049 9 0.002 0 0.125 6 0.005 3 0.018 1 0.000 2 116 1.6 16 68 998 984 1.0 0.062 3 0.003 6 0.158 8 0.008 8 0.018 6 0.000 3 119 1.8 17 75 736 1 081 0.7 0.049 2 0.002 2 0.124 1 0.005 5 0.018 4 0.000 3 118 1.7 18 102 972 1 238 0.8 0.048 5 0.002 4 0.123 7 0.006 2 0.018 4 0.000 3 118 1.6 19 144 1 448 1 606 0.9 0.049 6 0.002 2 0.124 2 0.005 4 0.018 2 0.000 2 116 1.4 20 107 1 069 1 378 0.8 0.048 4 0.002 6 0.122 8 0.006 6 0.018 6 0.000 3 119 1.7 16QXS-30,达过南流纹岩,北纬:31°19′45.0″,东经:88°54′51.6″ 1 152 1 486 1 861 0.8 0.048 4 0.002 2 0.124 3 0.005 4 0.018 8 0.000 3 120 1.6 2 57 517 923 0.6 0.052 0 0.002 6 0.136 9 0.007 1 0.019 0 0.000 3 122 2.0 3 81 765 1 254 0.6 0.059 7 0.003 0 0.154 2 0.007 3 0.019 0 0.000 3 122 2.1 4 92 888 1 262 0.7 0.054 6 0.002 5 0.135 3 0.005 5 0.018 5 0.000 3 118 1.8 5 65 590 1 026 0.6 0.053 9 0.003 0 0.142 5 0.007 6 0.019 2 0.000 3 123 2.1 6 109 967 1 389 0.7 0.053 3 0.002 7 0.140 1 0.006 8 0.019 3 0.000 3 123 2.0 7 113 1 020 1 451 0.7 0.051 7 0.002 4 0.137 6 0.006 1 0.019 5 0.000 3 124 2.1 8 139 1 343 1 876 0.7 0.052 1 0.002 2 0.134 6 0.005 5 0.018 9 0.000 3 121 1.6 9 77 743 1 179 0.6 0.050 1 0.002 8 0.128 1 0.006 9 0.019 0 0.000 4 121 2.3 10 143 1 384 1 693 0.8 0.054 5 0.002 5 0.143 4 0.006 3 0.019 3 0.000 3 123 1.8 11 93 859 1 255 0.7 0.049 1 0.002 6 0.128 8 0.006 9 0.019 2 0.000 3 122 1.9 12 1 040 1 049 1 548 0.7 0.052 6 0.002 4 0.132 4 0.006 3 0.018 2 0.000 3 116 1.8 13 137 1 313 1 795 0.7 0.050 5 0.002 3 0.130 9 0.005 7 0.019 1 0.000 3 122 1.8 14 72 670 1 079 0.6 0.054 2 0.002 9 0.135 0 0.006 8 0.018 5 0.000 3 118 2.0 15 86 818 1 244 0.7 0.050 5 0.002 4 0.129 4 0.005 7 0.018 9 0.000 3 121 2.0 16 265 2 739 2 856 1.0 0.049 5 0.002 1 0.124 6 0.005 2 0.018 6 0.000 3 119 1.8 17 136 689 1 128 0.6 0.117 4 0.012 8 0.432 2 0.059 9 0.021 1 0.000 6 135 3.6 18 133 1 317 1 595 0.8 0.046 1 0.002 2 0.120 9 0.005 8 0.019 1 0.000 3 122 1.8 19 107 1 056 1 531 0.7 0.051 1 0.002 6 0.131 8 0.006 4 0.018 9 0.000 3 121 1.7 20 148 1 525 1 733 0.9 0.052 4 0.002 2 0.136 0 0.005 6 0.019 1 0.000 3 122 1.8 13DB-69,安山岩,北纬:31°20′26.0″,东经:88°50′21.7″ 1 117 4 214 4 408 1.0 0.047 7 0.001 3 0.116 7 0.003 0 0.017 6 0.000 1 113 0.9 2 98 3 664 3 748 1.0 0.046 7 0.001 4 0.115 7 0.003 5 0.017 9 0.000 2 115 1.3 3 81 2 916 3 032 1.0 0.047 2 0.001 6 0.118 2 0.004 1 0.018 0 0.000 2 115 1.1 4 130 4 627 4 976 0.9 0.048 9 0.001 3 0.120 3 0.003 3 0.017 7 0.000 1 113 0.9 5 195 9 321 6 009 1.6 0.047 5 0.001 1 0.118 0 0.002 8 0.018 0 0.000 1 115 0.9 6 171 7 463 5 426 1.4 0.046 8 0.001 1 0.119 4 0.002 8 0.018 5 0.000 2 118 1.1 7 200 9 878 6 218 1.6 0.045 0 0.001 0 0.111 4 0.002 4 0.017 9 0.000 1 114 0.9 8 162 6 810 5 335 1.3 0.048 1 0.001 2 0.123 5 0.003 1 0.018 5 0.000 2 118 1.0 9 85 3 053 3 083 1.0 0.048 1 0.001 5 0.121 8 0.003 9 0.018 3 0.000 2 117 1.1 10 139 5 859 4 835 1.2 0.045 9 0.001 3 0.112 9 0.003 0 0.017 8 0.000 2 114 1.0 11 128 5 333 4 069 1.3 0.049 4 0.001 6 0.126 2 0.003 9 0.018 4 0.000 2 118 1.2 12 188 8 161 5 901 1.4 0.050 9 0.001 6 0.128 2 0.004 1 0.018 0 0.000 1 115 0.9 13 228 8 556 7 734 1.1 0.048 4 0.001 1 0.121 8 0.002 8 0.018 0 0.000 2 115 1.0 14 165 6 365 5 272 1.2 0.047 4 0.001 3 0.122 1 0.003 4 0.018 5 0.000 2 118 1.2 15 246 9 873 8 337 1.2 0.051 4 0.001 4 0.127 3 0.003 5 0.017 8 0.000 2 113 1.0 16 184 7 479 6 178 1.2 0.047 2 0.001 2 0.116 9 0.002 9 0.017 8 0.000 2 114 1.0 17 147 5 978 4 806 1.2 0.046 7 0.001 4 0.117 4 0.003 4 0.018 1 0.000 2 116 1.1 18 127 4 749 4 619 1.0 0.049 6 0.001 6 0.122 5 0.003 9 0.017 8 0.000 2 114 1.1 19 249 11 144 7 966 1.4 0.050 9 0.001 0 0.127 9 0.002 6 0.018 0 0.000 1 115 0.9 20 276 12 332 8 893 1.4 0.048 7 0.001 2 0.122 1 0.003 0 0.018 0 0.000 2 115 1.1 注:测试单位为中国地质大学(武汉)地质过程与矿产资源国家重点实验室. 表 3 黑云母二长花岗岩与流纹岩LA-ICP-MS锆石Hf同位素
Table 3. LA-ICP-MS zircon Hf isotopic compositions for the biotite-monzonitic granites and rhyolites
测点 t
(Ma)176Yb/
177Hf2σ 176Lu/
177Hf2σ 176Hf/
177Hf2σ (176Hf/
177Hf)iεHf(t) 2σ tDM
(Ma)tDM2
(Ma)16QXS-2,雄梅黑云母二长花岗岩,北纬:31°24′1.2″,东经:89°00′25.8″ 1 114 0.036 461 0.001 010 0.001 169 0.000 028 0.282 707 0.000 020 0.282 70 0.10 0.7 776 1 168 2 121 0.037 299 0.000 345 0.001 210 0.000 013 0.282 691 0.000 018 0.282 69 -0.29 0.6 799 1 198 3 116 0.038 094 0.000 479 0.001 156 0.000 012 0.282 727 0.000 022 0.282 72 0.86 0.8 747 1 121 4 119 0.079 642 0.001 108 0.002 385 0.000 021 0.282 769 0.000 024 0.282 76 2.33 0.9 710 1 029 5 119 0.015 774 0.000 126 0.000 546 0.000 005 0.282 714 0.000 019 0.282 71 0.50 0.7 754 1 146 6 116 0.036 725 0.000 375 0.001 169 0.000 009 0.282 703 0.000 019 0.282 70 0.02 0.7 781 1 174 7 120 0.046 230 0.000 383 0.001 442 0.000 015 0.282 687 0.000 019 0.282 68 -0.48 0.7 810 1 209 8 120 0.016 645 0.000 310 0.000 519 0.000 009 0.282 728 0.000 016 0.282 73 1.04 0.6 733 1 112 9 129 0.046 223 0.001 448 0.001 408 0.000 038 0.282 705 0.000 019 0.282 70 0.34 0.7 783 1 164 10 116 0.043 546 0.000 774 0.001 351 0.000 025 0.282 738 0.000 020 0.282 74 1.25 0.7 735 1 096 11 121 0.023 725 0.000 530 0.000 737 0.000 015 0.282 694 0.000 016 0.282 69 -0.17 0.6 785 1 190 12 123 0.066 133 0.000 291 0.001 905 0.000 010 0.282 785 0.000 026 0.282 78 3.01 0.9 678 989 13 119 0.042 184 0.001 249 0.001 268 0.000 038 0.282 719 0.000 018 0.282 72 0.63 0.6 761 1 138 14 117 0.054 206 0.000 586 0.001 622 0.000 017 0.282 688 0.000 025 0.282 68 -0.54 0.9 813 1 210 15 116 0.070 765 0.000 333 0.002 069 0.000 009 0.282 681 0.000 027 0.282 68 -0.82 1.0 832 1 228 16 119 0.047 068 0.001 254 0.001 399 0.000 033 0.282 667 0.000 020 0.282 66 -1.21 0.7 837 1 255 17 118 0.047 984 0.000 494 0.001 476 0.000 017 0.282 681 0.000 021 0.282 68 -0.73 0.7 819 1 224 18 118 0.047 668 0.000 291 0.001 399 0.000 006 0.282 685 0.000 024 0.282 68 -0.61 0.9 812 1 215 19 116 0.060 173 0.001 098 0.001 705 0.000 032 0.282 751 0.000 021 0.282 75 1.66 0.7 724 1 069 20 119 0.056 144 0.001 278 0.001 585 0.000 023 0.282 703 0.000 021 0.282 70 0.05 0.8 790 1 175 16QXS-30,达过南流纹岩,北纬:31°19′45.0″,东经:88°54′51.6″ 1 120 0.069 559 0.000 732 0.002 117 0.000 026 0.282 762 0.000 021 0.282 76 2.12 0.7 715 1 043 2 122 0.057 569 0.000 179 0.001 579 0.000 009 0.282 791 0.000 025 0.282 79 3.22 0.9 664 974 3 122 0.059 568 0.000 439 0.001 568 0.000 007 0.282 821 0.000 024 0.282 82 4.29 0.9 620 906 4 118 0.061 923 0.000 911 0.001 568 0.000 016 0.282 768 0.000 021 0.282 76 2.33 0.7 696 1 028 5 123 0.056 145 0.000 321 0.001 429 0.000 007 0.282 850 0.000 025 0.282 85 5.35 0.9 576 839 6 123 0.059 090 0.000 402 0.001 586 0.000 007 0.282 714 0.000 020 0.282 71 0.50 0.7 775 1 149 7 124 0.052 012 0.000 087 0.001 415 0.000 004 0.282 749 0.000 023 0.282 75 1.78 0.8 721 1 068 8 121 0.082 878 0.000 401 0.002 100 0.000 010 0.282 784 0.000 024 0.282 78 2.92 0.8 683 992 9 121 0.050 961 0.000 794 0.001 480 0.000 006 0.282 728 0.000 019 0.282 72 0.97 0.7 753 1 117 10 123 0.094 749 0.000 387 0.002 533 0.000 011 0.282 740 0.000 022 0.282 73 1.37 0.8 756 1 093 11 122 0.058 793 0.000 441 0.001 709 0.000 011 0.282 757 0.000 023 0.282 75 2.01 0.8 715 1 051 12 116 0.062 897 0.000 313 0.001 701 0.000 011 0.282 685 0.000 019 0.282 68 -0.68 0.7 819 1 219 13 122 0.091 275 0.000 070 0.002 402 0.000 003 0.282 752 0.000 024 0.282 75 1.77 0.9 736 1 067 14 118 0.045 915 0.000 581 0.001 266 0.000 008 0.282 766 0.000 022 0.282 76 2.27 0.8 694 1 032 15 121 0.043 807 0.000 290 0.001 184 0.000 003 0.282 712 0.000 019 0.282 71 0.43 0.7 769 1 152 16 119 0.082 996 0.000 211 0.002 304 0.000 005 0.282 760 0.000 023 0.282 75 1.99 0.8 723 1 050 17 135 0.053 274 0.000 356 0.001 722 0.000 009 0.282 798 0.000 028 0.282 79 3.73 1.0 656 952 18 122 0.075 221 0.000 372 0.002 024 0.000 006 0.282 794 0.000 019 0.282 79 3.30 0.7 667 969 19 121 0.103 238 0.000 792 0.002 678 0.000 014 0.282 727 0.000 020 0.282 72 0.85 0.7 779 1 125 20 122 0.060 721 0.000 705 0.001 610 0.000 006 0.282 701 0.000 020 0.282 70 0.04 0.7 793 1 177 注:测试单位为中国地质科学院地质研究所大陆构造与动力学重点实验室. -
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