Zircon U-Pb Geochronological, Elemental and Sr-Nd-Hf Isotopic Constraints on Petrogenesis of Late Triassic Quartz Diorite in Balong Region, East Kunlun Orogen
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摘要: 花岗岩的研究对于反演造山带下地壳物质组成、造山作用深部动力学过程具有重要意义.对位于东昆仑造山带东段的巴隆石英闪长岩开展了锆石U-Pb年代学、Hf同位素地球化学、全岩主微量元素地球化学和Sr-Nd同位素地球化学研究，以探讨其岩石成因和构造背景.岩体LA-ICP-MS锆石U-Pb定年结果为229.5±1.4 Ma，为晚三叠世岩浆活动产物.全岩SiO2含量为59.86%~61.83%，显示高Na2O（3.38%~3.55%）和Al2O3（16.38%~17.03%）特征，Na2O/K2O为1.25~1.39，Mg#为50.1~52.3，属高钾钙碱性系列.稀土元素标准化图呈右倾，具有较弱的负铕异常（δEu=0.71~0.82），微量元素蛛网图显示富集大离子亲石元素（LILE），显著亏损高场强元素（HFSE）.石英闪长岩的高Sr（474~609×10-6）、Sr/Y（32.31~40.86）、（La/Yb）N（13.34~15.32）和低Yb（1.34~1.75×10-6）、Y（13.40~15.60×10-6）含量与埃达克质岩石特征相似.全岩（87Sr/86Sr）i为0.708 186~0.708 428，εNd（t）为-5.75~-5.27，对应的二阶段模式年龄tDM2（Nd）为1 432~1 471 Ma；εHf（t）为-5.2~-3.2，tDM2（Hf）为1 305~1 420 Ma.岩相学、元素地球化学和Sr-Nd-Hf同位素结果揭示石英闪长岩起源于加厚下地壳的部分熔融，并混有幔源岩浆.构造判别图解显示巴隆石英闪长岩体形成于后碰撞伸展构造环境.东昆仑与巴颜喀拉地体的陆陆碰撞导致板片断离，软流圈物质上涌，使富集地幔熔融并底侵下地壳，下地壳部分熔融形成巴隆石英闪长岩.Abstract: The study of granite is of great significance to the inversion of the material composition of the lower crust and the deep dynamic process of orogeny. The quartz diorite in Balong region is located in the east of the East Kunlun orogen. In this paper, it presents LA-ICP-MS zircon U-Pb age for the Balong quartz diorite to determine precisely the time of the magmatism, and also presents geochemical, Sr-Nd-Hf isotope data for the Balong quartz diorite to constrain the petrogenesis and tectonic setting. The LA-ICP-MS U-Pb analyses of zircon yielded a weighted mean age of 229.5±1.4 Ma, indicating that it was emplaced in the Late Triassic. The quartz diorites have contents of SiO2 (59.86%-61.83%), Na2O (3.38%-3.55%), Al2O3 (16.38%-17.03%) with Na2O/K2O ratios ranging from 1.25 to 1.39 and Mg# values ranging from 50.1 to 51.2. They are characterized by high silicon and belonging to the high-potassium-calcium-alkaline rock. Meanwhile, they are enriched in large ion lithophile elements (LILEs) and depleted in high field strength elements(HFSEs). In addition, the quartz diorite shows characteristics of high Sr/Y (32.31-40.86) and (La/Yb)N (13.34-15.32) and low contents of Yb (1.34×10-6-1.75×10-6) and Y (13.40×10-6-15.60×10-6). These features indicate that the quartz diorite is similar to adakite. All rock samples are enriched in large ion lithophile elements and light rare earth elements, but depleted in high field strength elements. The (87Sr/86Sr)i ratios range from 0.708 186 to 0.708 428, εNd(t) values range from -5.75 to -5.27 with corresponding two-stage Nd model ages ranging from 1 432 to 1 471 Ma. The εHf(t) values are from -5.2 to -3.2 and two-stage Hf model ages rang from 1 305 to 1 420 Ma. Integrated geological, geochemical and isotopic data suggest that the quartz diorite from Balong region is most likely generated via partial melting of thickened mafic lower continental crust and with subordinate mantle-derived basic magma. In combination with the tectonic evolution of the East Kunlun orogenic belt and the geochronological and geochemical characteristics of contemporary intrusive rocks, it is concluded that the quartz diorite from Balong region was formed in post-collisional extensional tectonic environment. Slab break-off, triggered by continuous collision between the Bayanhar block and EKOB, led to underplating of basic magma formed by partial melting of enriched mantle. The quartz diorite from Balong region was formed by partial melting of lower crust.
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Key words:
- quartz diorite /
- Late Triassic /
- crust-mantle mixing /
- post-collision /
- East Kunlun /
- petrology /
- geochemistry
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图 1 东昆仑构造单元划分图(a)，东昆仑地区地质简图(b)及巴隆地区地质简图(c)
图a据Hu et al.（2016）；图b修编自Zhang et al.（2014）；图c修编自1∶5万巴隆乡幅地质矿产图；区域上晚三叠世岩浆岩研究概况：①220 Ma都兰花岗闪长岩（Shao et al., 2017）；②223.6 Ma香日德斑状花岗闪长岩（Xiong et al., 2014）；③223.2 Ma香日德二长花岗岩，220.6 Ma香日德花岗闪长岩（罗明非等，2014）；④218.3 Ma科科鄂阿龙石英闪长岩（陈国超等，2013a），225 Ma和勒冈西里可特花岗闪长岩（陈国超等，2013b）；⑤222 Ma小诺木洪花岗闪长岩（夏锐等，2014），215.6 Ma瑙木浑沟闪长玢岩（张明东等，2018）；1.元古宙地层；2.古生代地层；3.中生代地层；4.新生代地层；5.早古生代侵入岩；6.晚古生代-中生代侵入岩；7.古元古界金水口群；8.长城系小庙组；9.中-新元古界万宝沟群；10.奥陶系祁漫塔格群；11.早志留世花岗闪长岩；12.早石炭世白岗岩；13.早石炭世似斑状二长花岗岩；14.早二叠世闪长岩；15.晚三叠世花岗闪长岩；16.晚三叠世石英闪长岩；17.断层；18.推测断层；19.采样位置
Fig. 1. Geotectonic framework (a), geological map of the East Kunlun orogen belt (b) and simplified geological map of the Balong region (c)
图 2 巴隆石英闪长岩野外露头与镜下显微照片
a~c.地表石英闪长岩露头照片；e~f.样品显微镜镜下照片（正交偏光）；Pl.斜长石；Bt.黑云母；Qtz.石英；Hbl.角闪石；Ser.绢云母化
Fig. 2. Sample and microphotographs of the quartz diorite from Balong region
图 3 石英闪长岩样品D8012-1典型锆石CL图(a)及U-Pb定年结果(b, c)
图a中白色圆圈和红色圆圈分别代表U-Pb年代学、Hf同位素测试激光剥蚀点位，对应黑色年龄和红色数字分别代表锆石206Pb/238U表面年龄和εHf（t）值；圈中数字为分析点号，编号同表 1
Fig. 3. Cathodoluminescence images (a) and zircon U-Pb concordia diagrams (b, c) for zircons of quartz diorite sample (D8012-1)
图 4 巴隆石英闪长岩SiO2-K2O图解(a)和A/CNK-A/NK图解(b)
图a底图据Collins et al.（1982），图b底图据Maniar and Piccoli（1989）.数据来源：和勒冈希里克特花岗闪长岩据陈国超等（2013b），香日德斑状花岗岩据Xiong et al.（2014）
Fig. 4. K2O-SiO2 (a) and A/CNK-A/NK (b) diagrams for the quartz diorite from Balong region
图 5 巴隆石英闪长岩稀土元素球粒陨石标准化配分图(a)和微量元素原始地幔标准化蛛网图(b)
球粒陨石及原始地幔标准化数据引自Sun and McDonough（1989）；东昆仑晚三叠世埃达克岩数据陈国超等（2013b），Xiong et al.（2014）
Fig. 5. Chondrite-normalized REE patterns (a) and primitive mantle-normalized trace element patterns (b) for the quartz diorite from Balong region
图 6 巴隆石英闪长岩YbN-(La/Yb)N图解(a)和Y-Sr/Y图解(b)
图a、b底图据Defant and Drummond（1990）；数据来源同图 3，图中带短线的虚线为部分熔融曲线
Fig. 6. YbN-(La/Yb)N diagram (a) and Y-Sr/Y diagram (b) for the quartz diorite from Balong region
图 7 巴隆石英闪长岩(87Sr/86Sr)i-εNd(t)图解(a)和锆石Hf同位素图解(b)
图a阿尼玛卿洋中脊玄武岩数据来自郭安林等（2007），东昆仑三叠纪下地壳起源花岗岩数据来自刘成东等（2003）、张宏飞等（2006）、Xiong et al.（2012）、Ding et al.（2014）、Li et al.（2015）、Chen et al.（2017）；图b底图据Xiong et al.（2016），Hf同位素下地壳部分熔融数据来自东昆仑五龙沟花岗岩、闪长岩（Ding et al. 2014）、香日德石英闪长岩、钾长花岗岩、斑状花岗岩（Xiong et al. 2014）、洪水河石英闪长岩、花岗闪长岩（Song et al., 2020），富集地幔数据来自东昆仑白日其利辉长岩（熊富浩等，2011）、阿克楚克塞辉长岩（杨锡铭等，2018）、希望沟辉长岩（张志青等，2019）
Fig. 7. (87Sr/86Sr)i-εNd(t) diagram (a) and Hf isotopic compositions of zircons (b) for the quartz diorite from Balong region
图 8 巴隆石英闪长岩Zr-Zr/Nb图解和MgO-FeOT图解
底图据Zorpi et al.（1991）；数据来源同图 3
Fig. 8. Zr-Zr/Nb diagram (a) and MgO-FeOT diagram (b) for the quartz diorite from Balong region
图 9 巴隆石英闪长岩SiO2-Mg#图解(a)、Sr/Y估算地壳厚度与年龄关系图(b)、(Al2O3+FeOT+MgO+TiO2)-Al2O3/(FeOT+MgO+TiO2)图解(c)及(Na2O+K2O+MgO+FeOT+TiO2)-(Na2O+K2O)/(FeOT+MgO+TiO2)图解(d)
图a底图据Hou et al.（2004），图c、d底图据Patiño Douce（1999）；图a、c、d数据来源同图 3，图b后碰撞背景数据据陈国超等（2013b）、夏锐等（2014）、Xiong et al.（2014）、罗明非等（2014）、Li et al.（2015），同碰撞背景数据据Zhang et al.（2012）、国显正等（2016），俯冲背景数据据Xiong et al.(2012, 2014)、Ding et al.（2015）、Song et al.（2020）
Fig. 9. SiO2-Mg# diagram (a), age-crustal thickness estimated from Sr/Y diagram (b), (Al2O3+FeOT+MgO+TiO2)-Al2O3/(FeOT+MgO+TiO2) diagram (c) and (Na2O+K2O+MgO+FeOT+TiO2)-(Na2O+K2O)/(FeOT+MgO+TiO2) diagram (d) for the quartz diorite from Balong region
图 10 巴隆石英闪长岩构造环境判别图解
Syn-COLG. 同碰撞花岗岩；WPG. 板内花岗岩；VAG.火山弧花岗岩；ORG.洋脊花岗岩；底图据Pearce et al.（1984）；数据来源同图 3
Fig. 10. Tectonic discrimination diagrams for the quartz diorite from Balong region
表 1 巴隆石英闪长岩(D8012-1)锆石LA-ICP-MS U-Pb定年分析数据
Table 1. Zircon LA-ICP-MS U-Pb data of the Balong quartz diorite sample (D8012-1)
测试点号 232Th(10-6) 238U(10-6) Th/U U-Th-Pb同位素比值 年龄(Ma) 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 208Pb/232Th 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 208Pb/232Th 1σ D8012-1-1 111 216 0.51 0.054 1 0.002 8 0.266 9 0.013 9 0.036 2 0.000 6 0.011 0 0.000 4 372 119 240 11 229 4 221 8 D8012-1-2 175 283 0.62 0.051 9 0.002 8 0.266 0 0.015 1 0.036 9 0.000 5 0.013 6 0.000 4 280 160 239 12 234 3 272 8 D8012-1-3 78 143 0.54 0.052 0 0.0044 0.2600 0.021 5 0.036 9 0.000 7 0.012 6 0.000 5 283 194 235 17 234 5 253 9 D8012-1-4 87 159 0.55 0.050 5 0.003 3 0.251 1 0.016 4 0.036 2 0.000 5 0.012 4 0.000 4 220 152 227 13 229 3 250 9 D8012-1-5 151 256 0.59 0.050 8 0.003 2 0.252 9 0.016 4 0.036 1 0.000 6 0.012 5 0.000 4 232 146 229 13 229 4 252 9 D8012-1-6 94 192 0.49 0.051 9 0.003 1 0.256 1 0.015 2 0.036 4 0.000 5 0.012 4 0.000 4 280 106 232 12 230 3 248 7 D8012-1-7 108 188 0.58 0.051 0 0.002 5 0.252 5 0.012 4 0.036 4 0.000 4 0.012 3 0.000 3 239 115 229 10 230 3 248 7 D8012-1-8 183 241 0.76 0.052 3 0.003 3 0.2605 0.016 6 0.036 0 0.000 5 0.011 6 0.000 3 298 146 235 13 228 3 234 7 D8012-1-9 134 281 0.48 0.051 1 0.002 5 0.252 1 0.012 1 0.035 9 0.000 5 0.012 9 0.000 4 256 111 228 10 227 3 258 7 D8012-1-10 87 179 0.49 0.050 3 0.002 7 0.249 6 0.013 8 0.036 2 0.000 5 0.011 8 0.000 4 209 126 226 11 229 3 237 7 D8012-1-11 96 154 0.62 0.052 2 0.003 2 0.255 7 0.015 0 0.036 2 0.000 5 0.011 5 0.000 4 295 139 231 12 229 3 232 9 D8012-1-12 215 515 0.42 0.050 1 0.001 9 0.2501 0.009 3 0.036 0 0.000 4 0.0107 0.000 2 198 87 227 8 228 2 216 5 D8012-1-13 84 151 0.56 0.051 0 0.005 0 0.255 0 0.025 1 0.036 3 0.000 7 0.011 7 0.000 6 239 211 231 20 230 4 234 12 D8012-1-14 172 183 0.94 0.050 7 0.003 6 0.248 3 0.016 9 0.036 0 0.000 5 0.0104 0.000 3 233 168 225 14 228 3 209 6 D8012-1-15 121 169 0.72 0.052 3 0.003 5 0.2605 0.017 0 0.036 4 0.000 5 0.011 1 0.000 4 298 128 235 14 230 3 222 7 D8012-1-16 123 177 0.69 0.049 1 0.003 0 0.246 8 0.015 1 0.036 4 0.000 5 0.0102 0.000 3 150 56 224 12 230 3 205 5 D8012-1-17 212 270 0.78 0.051 9 0.002 5 0.257 5 0.011 9 0.036 0 0.000 5 0.0108 0.000 3 280 111 233 10 228 3 218 5 D8012-1-18 195 254 0.77 0.051 0 0.002 3 0.252 8 0.011 4 0.035 9 0.000 4 0.009 6 0.000 3 239 106 229 9 228 3 194 5 D8012-1-19 88 165 0.54 0.051 3 0.003 0 0.252 3 0.0146 0.036 2 0.000 6 0.0106 0.000 3 254 131 228 12 229 3 214 6 D8012-1-20 100 190 0.52 0.051 8 0.002 9 0.259 9 0.013 9 0.036 7 0.000 5 0.011 0 0.000 3 276 128 235 11 232 3 222 6 
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表 2 巴隆石英闪长岩主量元素(%)、微量元素和稀土元素(10-6)分析结果
Table 2. Major elements (%), trace and REE elements (10-6) data of the quartz diorite from Balong region
样品 BLWG-1 BLWG-2 BLWG-3 BLWG-4 BLWG-5 BLWG-6 N 35.96°
E 97.38°N 35.96°
E 97.38°N 35.95°
E 97.35°N 35.95°
E 97.35°N 35.95°
E 97.38°N 35.95°
E 97.38°SiO2 61.83 61.71 59.86 61.44 61.51 61.36 TiO2 0.62 0.71 0.76 0.70 0.67 0.68 Al2O3 16.86 16.38 17.03 16.56 16.90 16.60 Fe2O3T 4.88 5.46 5.96 5.66 5.34 5.46 MnO 0.08 0.09 0.09 0.09 0.08 0.09 MgO 2.60 3.02 3.13 2.87 2.75 2.77 CaO 4.96 4.95 5.77 5.26 5.42 5.33 Na2O 3.55 3.39 3.48 3.38 3.39 3.40 K2O 2.85 2.68 2.50 2.71 2.64 2.72 P2O5 0.14 0.16 0.18 0.16 0.16 0.16 LOI 0.94 0.72 0.69 0.70 0.96 0.57 Total 99.31 99.27 99.45 99.53 99.82 99.14 Na2O/K2O 1.25 1.26 1.39 1.25 1.28 1.25 Na2O+K2O 6.40 6.07 5.98 6.09 6.03 6.12 σ 2.18 1.97 2.12 2.01 1.96 2.04 A/CNK 0.94 0.94 0.90 0.92 0.92 0.91 A/NK 1.89 1.93 2.02 1.95 2.00 1.94 Mg# 51.3 52.3 51.0 50.1 50.5 50.1 Li 23.50 22.80 23.20 22.20 20.70 20.00 Be 1.85 1.52 1.74 1.65 1.77 1.99 Sc 10.10 11.40 12.40 11.70 10.90 11.00 V 102.00 133.00 139.00 94.00 111.00 131.00 Cr 21.00 23.00 25.00 22.00 20.00 21.00 Co 90.30 103.00 104.00 68.50 80.00 91.80 Ni 57.40 62.50 63.70 44.50 50.30 55.90 Cu 15.70 9.30 19.20 9.20 30.10 10.20 Ga 19.15 19.30 20.50 19.40 19.40 19.80 Rb 116.00 111.50 100.50 104.50 97.90 111.00 Ba 644.00 582.00 608.00 649.00 586.00 552.00 Sr 572.00 474.00 509.00 609.00 518.00 504.00 Y 14.00 13.80 15.30 15.50 13.40 15.60 Zr 142.00 143.00 195.00 167.00 167.00 196.00 Nb 9.70 9.50 9.60 9.40 9.80 9.60 Sn 2.00 2.00 2.00 2.00 2.00 2.00 Cs 7.23 7.37 5.08 5.05 4.63 6.85 La 31.40 28.40 27.60 34.80 29.70 31.80 Ce 47.50 47.20 48.30 47.20 42.50 44.20 Pr 6.20 5.85 6.04 7.55 6.00 6.73 Nd 21.70 21.10 22.50 28.40 21.60 24.20 Sm 4.18 3.99 4.29 5.21 4.10 4.74 Eu 1.00 0.98 1.06 1.11 1.02 1.00 Gd 3.32 3.24 3.44 4.11 3.28 3.69 Tb 0.48 0.47 0.50 0.58 0.48 0.54 Dy 2.84 2.74 2.93 3.43 2.84 3.22 Ho 0.57 0.53 0.57 0.66 0.58 0.63 Er 1.57 1.48 1.63 1.90 1.50 1.70 Tm 0.24 0.22 0.24 0.35 0.23 0.26 Yb 1.47 1.34 1.48 1.75 1.44 1.71 Lu 0.23 0.22 0.22 0.32 0.22 0.25 Hf 4.00 3.80 4.90 4.70 4.30 5.20 Ta 1.52 1.60 1.44 1.22 1.43 1.64 Pb 17.30 15.60 17.50 27.40 16.90 17.50 Th 14.65 12.95 10.05 18.60 12.05 17.05 U 4.32 2.06 1.99 2.04 2.38 2.31 ΣREE 122.70 117.76 120.80 137.37 115.49 124.67 LREE 111.98 107.52 109.79 124.27 104.92 112.67 HREE 10.72 10.24 11.01 13.10 10.57 12.00 LREE/HREE 10.45 10.50 9.97 9.49 9.93 9.39 (La/Yb)N 15.32 15.20 13.38 14.26 14.79 13.34 δEu 0.79 0.81 0.82 0.71 0.82 0.70 Sr/Y 40.86 34.35 33.27 39.29 38.66 32.31 注：A/CNK=Al2O3/（CaO+Na2O+K2O）摩尔比；A/NK=Al2O3/（Na2O+K2O）摩尔比；Mg#=100×molar MgO/（MgO+FeO）；σ=（K2O+Na2O）2/（SiO2-43）；δEu={（Eu/0.058）/[（Sm/0.153）+（Gd/0.205 5）]/2}.
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表 3 巴隆石英闪长岩全岩Sm-Nd同位素分析结果
Table 3. Sm-Nd isotopic compositions of the quartz diorite from Balong region
样品号 87Rb/86Sr 87Sr/86Sr ±1σ (87Sr/86Sr)i 147Sm/144Nd 143Nd/144Nd ±2σ εNd(t) tDM1(Ma) tDM2(Ma) BLWG-1 0.639 4 0.710 52 0.000 03 0.708 428 0.116 4 0.512 227 0.000 004 -5.66 1 447 1 464 BLWG-2 0.747 0 0.710 63 0.000 04 0.708 186 0.114 3 0.512 244 0.000 003 -5.27 1 390 1 432 BLWG-3 0.594 8 0.710 24 0.000 02 0.708 294 0.115 3 0.512 233 0.000 003 -5.51 1 421 1 452 BLWG-5 0.606 7 0.710 30 0.000 02 0.708 315 0.114 7 0.512 220 0.000 004 -5.75 1 433 1 471 注：计算采用(87Rb/86Sr)CHUR=0.082 7；(87Sr/86Sr)CHUR=0.704 5；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(230 Ma)，同位素亏损地幔模式年龄(tDM2)计算中采用(147Sm/144Nd)DM=0.213 6；(143Nd/144Nd)DM=0.513 1(Liew and Hofmann, 1988).
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表 4 巴隆石英闪长岩(D8012-1)锆石Hf同位素分析结果
Table 4. Hf isotopic data of the Balong quartz diorite sample (D8012-1)
测试点号 176Hf/177Hf 1σ 176Lu/177Hf 1σ 176Yb/177Hf 1σ 年龄(Ma) εHf(0) 1σ εHf(t) 1σ tDM1 (Ma) tDM2(Ma) fLu/Hf D8012-1-1 0.282 512 0.000 017 0.000 539 0.000 008 0.014 952 0.000 199 229 -9.2 0.8 -4.2 0.8 1 033 1 365 -0.98 D8012-1-2 0.282 506 0.000 018 0.000 829 0.000 014 0.022 396 0.000 363 234 -9.4 0.8 -4.4 0.8 1 050 1 377 -0.98 D8012-1-3 0.282 483 0.000 020 0.000 599 0.000 006 0.016 486 0.000 208 234 -10.2 0.9 -5.2 0.9 1 075 1 420 -0.98 D8012-1-4 0.282 541 0.000 016 0.000 527 0.000 008 0.014 571 0.000 186 229 -8.2 0.8 -3.2 0.8 993 1 308 -0.98 D8012-1-6 0.282 489 0.000 019 0.000 755 0.000 014 0.020 371 0.000 298 230 -10.0 0.8 -5.1 0.8 1 073 1 413 -0.98 D8012-1-8 0.282 504 0.000 021 0.000 536 0.000 006 0.015 361 0.000 141 228 -9.5 0.9 -4.5 0.9 1 044 1 381 -0.98 D8012-1-9 0.282 493 0.000 019 0.000 757 0.000 025 0.020 783 0.000 720 227 -9.9 0.8 -5.0 0.9 1 067 1 406 -0.98 D8012-1-10 0.282 508 0.000 018 0.000 439 0.000 008 0.012 201 0.000 201 229 -9.3 0.8 -4.4 0.8 1 036 1 372 -0.99 D8012-1-11 0.282 507 0.000 019 0.000 428 0.000 004 0.012 229 0.000 167 229 -9.4 0.9 -4.4 0.9 1 038 1 375 -0.99 D8012-1-12 0.282 523 0.000 018 0.000 451 0.000 007 0.011 986 0.000 163 228 -8.8 0.8 -3.9 0.8 1 016 1 343 -0.99 D8012-1-14 0.282 544 0.000 019 0.000 638 0.000 014 0.018 573 0.000 359 228 -8.1 0.8 -3.2 0.9 992 1 305 -0.98 D8012-1-15 0.282 518 0.000 017 0.000 728 0.000 010 0.021 449 0.000 197 230 -9.0 0.8 -4.0 0.8 1 031 1 355 -0.98 D8012-1-16 0.282 513 0.000 018 0.000 626 0.000 017 0.018 404 0.000 473 230 -9.2 0.8 -4.2 0.8 1 035 1 365 -0.98 D8012-1-17 0.282 541 0.000 021 0.000 676 0.000 010 0.019 806 0.000 222 228 -8.2 0.9 -3.2 0.9 997 1 310 -0.98 D8012-1-18 0.282 543 0.000 023 0.000 787 0.000 017 0.023 570 0.000 476 228 -8.1 1.0 -3.2 1.0 998 1 307 -0.98 D8012-1-20 0.282 527 0.000 018 0.000 413 0.000 001 0.011 755 0.000 094 232 -8.7 0.8 -3.6 0.8 1 010 1 335 -0.99 注：分析点保留U-Pb定点的分析点号: 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]}；tDM2=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=0.038 4(Griffin et al., 2000 )，(176Hf/177Hf)DM=0.283 25(Nowell et al., 1998 )；(176Lu/177Hf)CC=0.015, fCC=-0.548, fDM=0.16(Griffin et al., 2000 )，λ=1.867×10-11 a-1(Söderlund et al., 2004 ).
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