Geochemical Characteristics of Late Ordovician Granodiorite in Gouli Area, Eastern Kunlun Orogenic Belt, Qinghai Province: Implications on the Evolution of Proto-Tethys Ocean
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摘要: 原特提斯洋的俯冲时限以及俯冲极性还存在较大争议，对位于东昆仑造山带东端的昆南亚带中敖洼得花岗闪长岩体开展详细的LA-ICP-MS锆石U-Pb年代学、元素地球化学和同位素地球化学研究.结果表明，其单颗粒锆石LA-ICP-MS U-Pb定年结果为454±2 Ma，指示侵位时代为晚奥陶世.岩石Na2O/K2O比值为0.92~2.68，Mg#为39~43，A/CNK为1.00~1.03，属准铝质钙碱性-高钾钙碱性系列.岩石稀土元素标准化图显示右倾，(La/Yb)N介于17~46，具有明显的轻重稀土分异及中等-弱的Eu负异常(0.48~0.96).花岗闪长岩富集大离子亲石元素(Rb、Ba、K、La、Sr)，亏损高场强元素(Nb、Ta、P、Ti)，Cr、Ni含量较低，Sr/Y均值为55.全岩(87Sr/86Sr)i较为均一(0.705 9~0.706 3)，εNd(t)变化范围为-4.1~-1.9，对应的二阶段模式年龄为1.3~1.5 Ga，锆石εHf(t)变化范围为+5.4~+9.2.敖洼得花岗闪长岩具有低镁埃达克质岩的特征，为俯冲洋壳部分熔融的产物，熔融后的洋壳残留应为含石榴子石角闪岩，岩浆演化过程中经历了角闪石和斜长石的分离结晶.微量元素组成特征指示岩体形成于火山弧环境，结合昆中断裂带内蛇绿岩及其两侧相关变质岩、弧花岗岩、弧后盆地火山岩等的综合对比，笔者认为昆中缝合带原特提斯洋(昆中洋)在晚奥陶世存在双向俯冲，敖洼得岩体形成于原特提斯洋的南向俯冲消减过程.Abstract: The Aowade granodiorited in the east-end of Kunnan terrain, a part of Kunlun Orogenic belt, belongs to Proto-Tethyan tectonic domain. Detailed study of the granodiorite can offer important information to constrain the evolution of the Proto-Tethys Ocean. Detailer study of the granodiorite can offer important information to constrain the evolution of the Proto-Tethys Ocean. In this study, LA-ICP-MS zircon U-Pb dating yields a weighted mean age of 454±2 Ma for the intrusion. It is characterized by low K2O/Na2O (0.92-2.68) and Mg# (39-43), and the A/CNK is between 1.00 and 1.03. The REE exhibits right-dipping patterns with negative anomalies of Eu/Eu*(0.48-0.96) and high (La/Yb)N ratios. LILE(Rb, Ba, K, La, Sr) is enriched in this intrusion, while HFSE(Nb, Ta, P, Ti) is depleted relative to the primitive mantle, and the concentrations of transition elements such as Cr and Ni are low. The ratios of Sr/Y (average of 55) are relatively high. All the samples have high initial 87Sr/86Sr values (0.705 9-0.706 3) and εHf(t) (+5.4 to +9.2), but with relatively low εNd(t)(-4.1 to -1.9) and old two stage model age (T2DMNd=1.3-1.5 Ga). In combination with the lithology, geochemical signature and isotopic compositions of the intrusion, we propose that the Aowade granodiorite was derived from melting of the subducted oceanic crust with minor involvement of continent crust. The possible residual of the source region is garnet amphibolite. Fractional crystallization of pyroxene, amphibole and plagioclase may have also occurred during the evolution of magma. Integrating evidences from the geodynamic setting of the Aowade granodiorite, the ophiolites in the Kunzhong structure zone, and the metamorphic rocks, arc-related igneous rocks on either side of the Kunzhong structure zone, it is concluded that the Aowade granodiorite was formed during the subduction of Proto-Tethys Ocean, which further reveals the nature of bidirectional subduction of the Proto-Tethys in the Late Ordovician.
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图 1 (a)东昆仑构造位置、(b)沟里地区地质简图和(c)敖洼得岩体地质简图
图中年龄均为锆石U-Pb年龄，数据据殷鸿福等(2000)及本文测试；a.据Xu et al.(2001)；b.修编自殷鸿福等(2000)
Fig. 1. Geotectonic framework of the East Kunlun orogenic belt (a), geological map of the Gouli area (b) and simplified geological map of the Aowade pluton (c)
图 2 沟里地区敖洼得花岗闪长岩镜下照片(正交偏光)
Pl.斜长石；Kf.钾长石；Amp.角闪石；Bi.黑云母；Q.石英
Fig. 2. Microphotographs of Aowade granodiorite from Gouli area
图 3 敖洼得花岗闪长岩样品(B1045-1) 典型锆石CL图
实线圈和虚线圈分别代表U-Pb和Hf同位素分析测试点
Fig. 3. Cathodoluminescence images for zircons of sample B1045-1
图 4 敖洼得花岗闪长岩样品(B1045-1) U-Pb协和图(a)和锆石稀土元素球粒陨石标准化配分图(b)
球粒陨石数据据Sun and McDonough(1989)
Fig. 4. Zircon U-Pb concordia diagram of sample B1045-1 of Aowade granodiorite (a) and chondrite normalized REE patterns for zircons (b)
图 5 沟里地区敖洼得花岗闪长岩(a)TAS图解、(b)K2O-SiO2关系、(c)A/NK-A/CNK关系和(La/Yb)N-YbN关系
数据来源：东昆仑陆壳重熔型花岗岩(441 Ma; 王晓霞等, 2012), 东昆仑正常岛弧花岗岩(437 Ma)和板片熔融埃达克质花岗岩(436 Ma; Li et al., 2015)；a图据Wison(1989); b图据Rollinson(1993); c图据Maniar and Piccoli(1989); d图据Defant and Drummond(1990), 图中带小短线的虚线为部分熔融曲线
Fig. 5. Major-element plots for the Aowade granodiorite from Gouli area (a) total alkalis vs. silica (TAS) diagram, (b) K2O vs. SiO2 diagram, (c) A/NK vs. A/CNK diagram, (d) (La/Yb)N vs. YbN diagram
图 6 沟里地区敖洼得花岗闪长岩哈克图解
数据来源同图 5
Fig. 6. Harker variation diagrams showing the concentrations of major elements for the Aowade granodiorite from Gouli area and other related rocks in the East Kunlun orogenic belt
图 7 沟里地区敖洼得花岗闪长岩稀土元素配分图(a)和微量元素原始地幔标准化蛛网图(b)
数据来源同图 5；球粒陨石和原始地幔标准化数据据Sun and McDonough(1989)
Fig. 7. Chondrite-normalized REE patterns (a) and primitive mantle-normalized trace elements spider diagram (b) for Aowade granodiorite from Gouli area
图 8 沟里地区敖洼得花岗闪长岩Sr-Nd同位素组成图解(a)和锆石Hf同位素组成图解(b)
数据来源：a图数据来源同图 5, t=454 Ma；b图洋中脊玄武岩(Workman and Hart, 2005)；麻粒岩(龙晓平, 2004)；富集地幔熔融或其混染地壳花岗岩类(刘彬, 2011; 贾儒雅, 2013)；基底或基底熔融花岗岩类(余能等, 2005; 贾儒雅, 2013).b图带小短线曲线为洋中脊玄武岩同化混染麻粒岩伴随分离结晶(AFC)曲线，图中r表示同化混染与结晶速率之比
Fig. 8. Plots of initial 87Sr/86Sr vs. εNd(t) (a) and Hf isotopic compositions of zircons (b) from the Aowade granodiorite
图 9 沟里地区敖洼得花岗闪长岩矿物分离结晶图解
Opx.斜方辉石；Cpx.单斜辉石；Hb.角闪石；Kf.黑云母；Pl.斜长石；Zr.锆石；Ap.磷灰石；Sph.榍石；Allan.褐帘石.图中”+”所标数值为1-F，F为剩余岩浆占原始岩浆的比例
Fig. 9. Ba vs. Rb (a), Rb/Sr vs. Sr (b), Ba vs. Eu/Eu* (c) and (La/Yb)N vs. La (d) diagrams for the Aowade intrusion illustrating fractional crystallization of apatite, biotite and minor hornblende and plagioclase
图 10 沟里地区敖洼得花岗闪长岩Rb-(Yb+Nb)(a)和Rb-(Yb+Ta)(b)构造环境判别图解
syn-COLG.同碰撞花岗岩; WPG.板内花岗岩; VAG.岛弧花岗岩; ORG.洋中脊花岗岩.底图据Pearce et al.(1984)
Fig. 10. Rb vs. Yb+Nb (a) and Rb vs. Yb+Ta (b) discrimination diagrams for Aowade granodiorite from Gouli area
图 11 晚奥陶世昆中洋俯冲构造演化
图中年龄来源见4.2成岩地球动力学背景一节
Fig. 11. A suggested model for the evoloution of Kunzhong ocean during Late Ordovician
表 1 沟里地区敖洼得花岗闪长岩(B1045) 锆石LA-ICP-MS U-Pb定年分析数据
Table 1. Zircon LA-ICP-MS U-Pb data of the Aowade granodiorite sample (B1045) from Gouli area
点号
232Th
(10-6)
238U
(10-6)Th/U 同位素比值 年龄(Ma) 207Pb/206Pb ±σ 207Pb/235U ±σ 206Pb/238U ±σ 208Pb/232Th ±σ 207Pb/206Pb ±σ 207Pb/235U ±σ 206Pb/238U ±σ 208Pb/232Th ±σ B1045-1-1 840 880 0.95 0.056 5 0.001 3 0.565 2 0.012 7 0.072 2 0.000 5 0.022 0 0.000 3 472 50 455 8 449 3 440 7 B1045-1-2 396 540 0.73 0.056 0 0.001 3 0.566 0 0.013 1 0.073 1 0.000 5 0.022 2 0.000 4 454 54 455 8 455 3 445 8 B1045-1-3 470 630 0.75 0.056 4 0.001 5 0.576 8 0.016 8 0.073 7 0.000 8 0.024 4 0.000 6 478 61 462 11 458 5 488 11 B1045-1-4 149 342 0.44 0.060 9 0.001 7 0.616 9 0.018 0 0.073 3 0.000 7 0.023 6 0.000 6 635 61 488 11 456 5 471 12 B1045-1-5 277 545 0.51 0.055 5 0.001 5 0.562 9 0.014 9 0.073 3 0.000 8 0.023 0 0.000 5 435 64 453 10 456 5 459 11 B1045-1-6 76 203 0.37 0.053 6 0.002 1 0.545 5 0.021 7 0.073 2 0.000 8 0.021 2 0.000 6 354 87 442 14 456 5 425 12 B1045-1-7 511 629 0.81 0.066 0 0.001 8 0.657 3 0.018 9 0.071 8 0.000 7 0.022 5 0.000 5 806 59 513 12 447 4 450 10 B1045-1-8 47 374 0.13 0.054 7 0.001 6 0.555 6 0.016 4 0.073 2 0.000 7 0.025 8 0.000 9 467 60 449 11 455 4 514 18 B1045-1-9 375 545 0.69 0.066 9 0.001 5 0.680 5 0.016 5 0.073 2 0.000 7 0.025 5 0.000 5 835 46 527 10 455 4 508 10 B1045-1-10 351 565 0.62 0.058 4 0.001 3 0.591 1 0.012 9 0.073 2 0.000 6 0.023 3 0.000 4 546 48 472 8 455 4 466 9 B1045-1-11 190 362 0.53 0.055 7 0.001 5 0.563 5 0.015 3 0.073 1 0.000 6 0.022 7 0.000 5 443 56 454 10 455 4 453 10 B1045-1-12 121 238 0.51 0.055 5 0.001 9 0.559 9 0.019 2 0.073 2 0.000 9 0.025 2 0.000 7 432 78 451 13 456 5 503 14 B1045-1-13 309 527 0.59 0.059 5 0.001 5 0.603 2 0.015 2 0.073 2 0.000 6 0.023 2 0.000 5 587 54 479 10 455 4 463 9 B1045-1-14 183 413 0.44 0.056 6 0.001 5 0.575 0 0.015 5 0.073 4 0.000 8 0.023 4 0.000 5 476 57 461 10 456 5 467 10 B1045-1-15 192 428 0.45 0.061 7 0.001 9 0.633 2 0.022 2 0.073 7 0.001 0 0.024 9 0.000 8 665 67 498 14 458 6 498 16 B1045-1-16 218 408 0.53 0.056 7 0.001 6 0.572 7 0.015 6 0.073 2 0.001 0 0.022 7 0.000 5 480 61 460 10 455 6 453 10 B1045-1-17 191 393 0.49 0.060 9 0.001 7 0.616 1 0.017 5 0.073 2 0.000 7 0.024 9 0.000 6 635 62 487 11 455 4 497 11 B1045-1-18 215 469 0.46 0.054 8 0.001 3 0.557 5 0.014 1 0.073 3 0.000 8 0.022 6 0.000 5 467 54 450 9 456 5 452 11 
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表 2 沟里地区敖洼得花岗闪长岩(B1045) 锆石微量元素分析数据(10-6)
Table 2. Zircon LA-ICP-MS trace elements (10-6) data of the Aowade granodiorite sample (B1045) from Gouli area
点号 La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Y Hf Ta Ti Nb Eu/Eu* B1045-1-1 0.76 217.9 0.83 11.66 25.8 7.13 155.5 49.0 568 196 837 160 1 572 267 6 358 25 580 4.50 11.8 21.11 0.27 B1045-1-2 5.24 82.6 1.30 9.22 12.9 4.20 67.3 23.2 275 100 468 97 1 019 188 3 475 26 759 2.41 3.7 8.99 0.35 B1045-1-3 11.84 81.7 3.57 17.59 8.6 2.69 41.0 13.2 158 55 260 55 585 109 1 905 30 811 2.56 6.8 6.55 0.36 B1045-1-4 1.15 37.5 0.52 2.73 4.0 1.73 24.7 9.0 102 39 191 41 444 85 1 368 30 358 1.66 13.0 4.39 0.41 B1045-1-5 0.66 72.0 0.63 6.56 8.7 2.98 56.9 19.3 235 87 420 87 941 173 3 004 30 301 3.51 6.1 11.37 0.31 B1045-1-6 0.14 27.4 0.00 0.87 2.7 0.72 17.3 6.5 85 33 169 38 429 85 1 192 39 140 1.36 4.9 3.24 0.24 B1045-1-7 4.48 118.4 3.65 28.41 22.7 4.67 75.1 23.8 279 104 494 101 1 096 202 3 587 29 690 3.57 20.5 14.78 0.31 B1045-1-8 0.02 22.9 0.05 0.53 1.7 0.88 16.3 5.3 81 36 200 46 541 107 1 317 31 009 2.37 10.7 6.02 0.34 B1045-1-9 27.79 172.1 16.53 99.35 44.7 8.34 71.8 15.9 175 61 285 59 631 116 2 096 30 022 2.75 1.9 8.27 0.45 B1045-1-10 51.58 207.6 20.16 112.57 35.0 8.12 79.2 20.8 233 84 390 81 871 158 2 846 29 790 3.04 11.5 10.62 0.46 B1045-1-11 1.24 49.3 0.51 4.16 7.1 2.51 38.5 13.5 168 63 308 65 725 136 2 204 27 639 1.90 8.3 6.30 0.37 B1045-1-12 1.71 53.5 0.40 3.75 4.9 2.41 36.3 12.0 152 58 281 61 680 128 2 012 27 165 2.92 26.4 8.71 0.40 B1045-1-13 26.26 139.8 9.71 51.73 21.5 4.40 66.7 19.4 237 86 409 85 900 163 2 968 32 423 3.30 111.1 14.28 0.33 B1045-1-14 9.26 89.0 5.17 32.60 18.4 3.67 48.7 14.0 174 66 321 67 734 138 2 281 30 574 2.46 5.3 9.00 0.35 B1045-1-15 12.59 70.0 3.33 16.08 7.1 1.83 33.4 10.5 136 50 242 52 566 105 1 727 30 786 2.73 12.1 8.55 0.30 B1045-1-16 18.81 95.9 5.61 26.27 11.1 2.73 41.4 12.4 154 55 255 53 573 105 1 897 28 803 2.39 10.1 7.51 0.34 B1045-1-17 4.59 60.8 1.64 8.44 7.7 2.05 45.2 15.0 186 68 327 69 737 137 2 375 29 591 2.56 3123.0 14.72 0.26 B1045-1-18 3.31 56.5 1.10 5.25 6.1 1.80 34.7 12.3 156 61 297 64 713 137 2 127 33 711 2.97 13.6 9.46 0.30
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表 3 沟里地区敖洼得花岗闪长岩主量元素(%)、微量元素和稀土元素(10-6)分析结果
Table 3. Major elements (%), trace elements and rare earth elements (10-6) data of Aowade granodiorite from Gouli area
样号 B1042-1 B1043-1 B1044-1 B1045-1 B1046-1 SiO2 70.40 68.30 67.80 68.80 69.10 Al2O3 14.85 15.45 16.45 15.95 15.50 Fe2O3 2.57 2.85 3.01 2.71 2.73 MgO 0.83 0.98 1.12 1.00 1.02 CaO 2.41 3.04 3.46 3.39 3.07 Na2O 3.61 3.98 4.67 4.61 4.29 K2O 3.92 3.11 2.10 1.72 2.24 TiO2 0.35 0.41 0.43 0.37 0.39 P2O5 0.10 0.13 0.16 0.13 0.13 MnO 0.04 0.05 0.05 0.04 0.04 BaO 0.11 0.08 0.08 0.08 0.14 Total 100.00 99.38 100.20 99.74 99.81 LOI 0.70 0.91 0.78 0.82 1.05 Na2O/K2O 0.92 1.28 2.22 2.68 1.92 Na2O+K2O 7.53 7.09 6.77 6.33 6.53 A/CNK 1.02 1.00 1.01 1.02 1.03 Mg# 39.00 41.00 43.00 42.00 43.00 Li 29.81 17.58 10.23 7.40 20.33 Be 1.37 1.39 1.30 1.17 1.07 Sc 4.83 6.54 1.62 2.30 3.34 V 32.20 43.79 38.44 34.91 36.56 Cr 6.59 5.17 6.09 6.60 7.51 Co 54.26 78.37 20.28 51.59 37.80 Ni 2.86 2.69 3.56 4.39 4.50 Cu 2.65 1.72 2.73 4.00 1.19 Zn 50.97 51.07 55.44 52.81 57.53 Ga 17.44 17.42 16.05 16.50 16.44 Rb 119.89 96.02 40.69 45.65 70.36 Sr 291.96 339.82 509.43 560.59 536.89 Y 18.68 15.21 5.48 6.68 9.19 Zr 179.94 186.81 169.19 141.07 196.52 Nb 18.45 15.46 10.51 9.74 10.47 Sn 1.86 1.64 0.81 0.78 1.25 Cs 1.57 1.50 1.71 1.10 2.64 Ba 952.01 735.43 668.52 712.45 1194.43 La 49.35 33.49 31.34 25.23 40.54 Ce 89.05 60.50 50.98 44.81 67.90 Pr 8.95 6.21 5.24 4.45 6.67 Nd 31.36 22.74 17.98 15.78 23.02 Sm 5.61 4.20 2.71 2.65 3.88 Eu 0.79 0.75 0.72 0.71 0.92 Gd 4.20 3.29 1.68 1.91 2.73 Tb 0.60 0.49 0.22 0.25 0.37 Dy 3.43 2.89 1.15 1.35 1.87 Ho 0.65 0.56 0.20 0.23 0.33 Er 1.84 1.48 0.49 0.60 0.88 Tm 0.26 0.21 0.07 0.09 0.12 Yb 1.65 1.38 0.49 0.58 0.75 Lu 0.24 0.21 0.08 0.08 0.10 Hf 4.63 4.74 4.04 3.40 4.65 Ta 1.25 1.21 0.57 0.75 0.83 Tl 0.73 0.64 0.41 0.32 0.45 Pb 25.52 23.40 17.80 15.14 15.54 Th 13.18 8.79 7.40 7.13 9.54 U 1.61 1.65 1.50 0.95 1.27 REE 197.99 138.40 113.35 98.72 150.08 (La/Yb)N 21.52 17.36 45.97 31.40 38.63 δEu 0.48 0.60 0.96 0.92 0.82 注：LOI.烧失量; Mg#=mole[Mg/(Ma+Fe)×100];A/CNK=mole[Al2O3/(CaO+Na2O+K2O)].
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表 4 沟里地区敖洼得花岗闪长岩全岩Sr-Nd同位素分析结果
Table 4. Sr-Nd isotopic compositions of Aowade granodiorite from Gouli area
样品号 87Rb/86Sr 87Sr/86Sr ±2σ (87Sr/86Sr)i 147Sm/144Nd 143Nd/144Nd ±2σ εNd(t) T2DMNd(Ma) B1042-1 1.188 8 0.713 960 0.000 006 0.706 264 0.108 1 0.512 166 0.000 003 -4.07 1 518 B1043-1 0.817 8 0.711 533 0.000 007 0.706 239 0.111 6 0.512 243 0.000 002 -2.77 1 412 B1045-1 0.235 6 0.707 565 0.000 006 0.706 040 0.101 4 0.512 259 0.000 004 -1.86 1 339 B1046-1 0.379 2 0.708 343 0.000 006 0.705 889 0.101 8 0.512 239 0.000 003 -2.28 1 373 注:εNd(t)值计算采用(147Sm/144Nd)CHUR=0.196 7;(143Nd/144Nd)CHUR=0.512 638;t代表成岩年龄(454 Ma); 同位素亏损地幔模式年龄(T2DM)计算采用(147Sm/144Nd)DM=0.213 7;(143Nd/144Nd)DM=0.513 15.
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表 5 敖洼得花岗闪长岩(B1045-1) 锆石Hf同位素分析结果
Table 5. Hf isotopic data for zircon of sample B1045-1 from Aowade granodiorite
点号 176Lu/177Hf 176Yb/177Hf 176Hf/177Hf 1σ 年龄(Ma) εHf(0) εHf(t) TDM T2DMHf fLu/Hf 01 0.000 808 0.018 803 0.282 720 0.000 011 458 -1.8 8.0 750 867 -0.98 02 0.000 583 0.013 502 0.282 706 0.000 012 455 -2.3 7.5 765 892 -0.98 03 0.000 797 0.018 284 0.282 735 0.000 014 456 -1.3 8.5 728 838 -0.98 04 0.000 976 0.022 795 0.282 749 0.000 014 455 -0.8 8.9 712 814 -0.97 05 0.000 836 0.019 386 0.282 734 0.000 012 455 -1.3 8.4 730 841 -0.97 06 0.000 855 0.019 291 0.282 692 0.000 016 456 -2.8 6.9 791 925 -0.97 07 0.000 859 0.019 370 0.282 724 0.000 017 455 -1.7 8.1 746 862 -0.97 08 0.000 844 0.019 281 0.282 755 0.000 011 455 -0.6 9.2 701 800 -0.97 09 0.000 843 0.019 255 0.282 723 0.000 014 455 -1.7 8.0 747 863 -0.97 10 0.000 818 0.018 019 0.282 697 0.000 011 455 -2.6 7.1 782 913 -0.98 11 0.001 055 0.024 713 0.282 703 0.000 016 447 -2.4 7.1 779 909 -0.97 12 0.000 531 0.012 156 0.282 645 0.000 021 456 -4.5 5.4 849 1 010 -0.98 13 0.000 827 0.018 996 0.282 725 0.000 015 456 -1.7 8.1 743 858 -0.98 14 0.000 687 0.015 422 0.282 710 0.000 015 449 -2.2 7.5 761 888 -0.98 15 0.000 805 0.018 406 0.282 728 0.000 015 458 -1.6 8.3 739 852 -0.98 16 0.000 975 0.022 486 0.282 739 0.000 016 455 -1.2 8.6 726 834 -0.97 注：εHf(0)=10 000×[(176Hf/177Hf)S/(176Hf/177Hf)CHUR, 0-1;fLu/Hf=(176Lu/177Hf)S/(176Lu/177Hf)CHUR-1;εHf(t)=10 000× {[(176Hf/177Hf)S-(176Lu/177Hf)S×(eλt-1)]/[(176Hf/177Hf)CHUR, 0-(176Lu/177Hf)CHUR×(eλt-1)]-1};TDM=1/λ×ln{1+[(176Hf/177Hf)S-(176Hf/177Hf)DM]/[(176Lu/177Hf)S-(176Lu/177Hf)DM; T2DM=TDMHf-(TDMHf-t)×[(fCC-fS)/(fCC-fDM)]; (176Lu/177Hf)CHUR=0.033 2, (176Hf/177Hf)CHUR, 0=0.282 772( Blichert-Toft et al., 1997 ), (176Lu/177Hf)DM=0.033 2, (176Hf/177Hf)DM=0.282 772(Griffin et al., 2000), fCC=0.015, fDM=-0.548, λ=1.867×10-11yr-1(Söderlund et al., 2004 ).
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