A Comparative Study and Its Genesis of Porphyroclastic Rhyolite from Ehuling and Daguding Formations in Midwestern of Xiangshan Uranium Orefield, Jiangxi Province
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摘要: 以在相山中西部钻孔中揭露到的鹅湖岭组和打鼓顶组碎斑流纹岩为研究对象，从岩石矿物学、岩石地球化学、LA-ICP-MS锆石U-Pb年代学和Hf同位素等方面对比研究了这两套碎斑流纹岩.结果显示其矿物学组成较为接近，且具有相似的岩石地球化学特点，岩石富硅、高K2O低Na2O、低MgO；稀土元素配分曲线形态总体一致，均为富集轻稀土的右倾式，鹅湖岭组碎斑流纹岩Eu负异常更为明显，指示其可能经历了更高程度的斜长石结晶分离作用，或源区残留有更多的斜长石；打鼓顶组碎斑流纹岩轻重稀土分馏更为明显，可能与源区岩浆中的榍石、褐帘石和独居石含量有关；蛛网图上显示K、Ba、Sr等大离子亲石元素和Nb、Ti、P等高场强元素亏损，而Rb、Th、Nd等富集的特点.这些相似的岩石地球化学特征暗示两套碎斑流纹岩之间具有一定的同源性.锆石U-Pb测年结果显示鹅湖岭组与打鼓顶组碎斑流纹岩年龄分别为132.4±0.7 Ma和131.9±0.8 Ma；通过计算测得鹅湖岭组碎斑流纹岩εHf（t）为-9.5~-4.5，两阶段模式年龄tDMC为1 470~1 787 Ma，打鼓顶组碎斑流纹岩εHf（t）为-14.2~-8.1，两阶段模式年龄tDMC为1 704~2 087 Ma.以上岩石矿物学特征、岩石地球化学特征、锆石U-Pb年龄及Hf同位素特征表明鹅湖岭组与打鼓顶组碎斑流纹岩具有一定的相似性，但同时又有差别，结合前人研究资料，认为鹅湖岭组和打鼓顶组碎斑流纹岩的形成可能具有同源性，二者均是在早白垩世弧后拉伸环境背景下，主要由古元古代-中元古带基底变质岩部分熔融而形成，可能伴随有不同程度的地幔物质的加入.Abstract: Porphyroclastic rhyolites of Ehuling and Daguding formations were taken as the research objects in this paper, which was sampled from the boreholes in the midwestern parts of Xiangshan uranium orefield. A comparative study of porphyroclastic rhyolite from these two formations were carried out by means of petromineralogy, lithogeochemistry, U-Pb geochronology and Hf isotopes. The results illustrate that the mineralogical composition and lithogeochemical characteristics of porphyroclastic rhyolite from Ehuling and Daguding formations are relatively semblable, the rock enriching Si and K2O, low Na2O and MgO. Chondrite normalized REE curves are generally consistent, showing right-inclined type with enriched LREE. The samples from the Ehuling Formation demonstrate more intensive Eu negative anormaly, indicating that a high degree of crystallizational fractionation of plagioclase was occured, or more plagioclase residued in source area. While the high fractional degree of LREE and HREE of Daguding porphyroclastic rhyolite is likely related to the high contents of secondary minerals, such as titanite, epidoite and monazite. Primitive mantle-normalized spider diagram shows depletion of lithophile elements (K, Ba, Sr) and high field strength elements (Nb, Ti, P), and enrichment of Rb, Th, Nd. These similar petrogeochemical characteristics suggest a certain homology between Ehuling and Daguding porphyroclastic rhyolite. Zircon U-Pb dating results indicate that the age of porphyroclastic rhyolite from Ehuling Formation and Daguding Formation are 132.4±0.7 Ma and 131.9±0.8 Ma respectively. The εHf(t) of porphyroclastic rhyolite of Ehuling Formation is (-9.5)-(-4.5), and the two-stage Hf model age is 1 470-1 787 Ma; while the εHf(t) of porphyroclastic rhyolite of Daguding Formation is (-14.2)-(-8.1), and the two-stage Hf model age is 1 704-2 087 Ma. The above petromineralogy, lithogeochemistry, zircon U-Pb age and Hf isotope characteristics show that the porphyroclastic rhyolite of Ehuling Formation and the Daguding Formation have certain similarities, but at the same time, some differences exist. Combined with previous research data, a conclusion can be drawn, the formation of two sets of porphyroclastic rhyolite maybe homologous, both of them are derived from the partial melting of Paleoproterozoic-Mesoproterozoic metamorphic rock basement under the background of Early Cretaceous regional extensional environment, and may be accompanied by the merging of mantle material in a certain degree.
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图 1 相山铀矿田大地构造位置(a)及地质简图(b)
1.上白垩统砂砾岩；2.碎斑流纹岩；3.凝灰岩、粉砂岩；4.流纹英安岩；5.凝灰质粉砂岩、凝灰岩、熔结凝灰岩；6.上三叠统石英砂岩、页岩；7.下石炭统浅变质石英砂岩；8.中元古界片岩、千枚岩；9.花岗斑岩；10.石英二长斑岩；11.煌斑岩；12.辉绿岩；13.加里东期花岗岩；14.断裂；15.钻孔位置；据王勇剑等（2019）修改
Fig. 1. Geotectonic location (a) and geological sketch map (b) of Xiangshan uranium orefield
图 2 相山河元背地区CUSD2⁃CUSD3钻孔剖面
1.第四系；2.下白垩统鹅湖岭组上段；3.下白垩统鹅湖岭组下段；4.下白垩统打鼓顶组上段；5.下白垩统打鼓顶组下段；6.中元古界变质岩；7.断裂；8.铀矿化；9.多金属矿化
Fig. 2. Cross section of CUSD2⁃CUSD3 boreholes of Heyuanbei area in Xiangshan
图 3 鹅湖岭组与打鼓顶组碎斑流纹岩野外照片及镜下照片
a.鹅湖岭组碎斑流纹岩野外照片；b.打鼓顶组碎斑流纹岩野外照片；c.鹅湖岭组碎斑流纹岩的斑状结构（正交偏光）；d.鹅湖岭组碎斑流纹岩基质显微照片（正交偏光）；e.打鼓顶组碎斑流纹岩显微照片（正交偏光）；f.碎斑流纹岩中的后期碳酸盐脉（正交偏光）；Cal.碳酸盐脉；Pe.条纹长石；Q.石英
Fig. 3. Field photos and micrographs of porphyroclastic rhyolites of Ehuling Formation and Daguding Formation
图 4 鹅湖岭组与打鼓顶组碎斑流纹岩SiO2-K2O图解
Fig. 4. SiO2-K2O diagram of porphyroclastic rhyolite from Ehuling Formation and Daguding Formation
图 5 鹅湖岭组与打鼓顶组碎斑流纹岩微量元素原始地幔标准化蛛网图(标准化值引自Sun and McDonough, 1989)
Fig. 5. Primitive mantle-normalized trace element spider diagram of porphyroclastic rhyolite from Ehuling Formation and Daguding Formation(standardized data quoted from Sun and McDonough, 1989)
图 6 鹅湖岭组与打鼓顶组碎斑流纹岩稀土元素球粒陨石标准化配分曲线(标准化值引自Sun and McDonough, 1989)
Fig. 6. Chondrite-normalized REE patterns of porphyroclastic rhyolite from Ehuling Formation and Daguding Formation(standardized data quoted from Sun and McDonough, 1989)
图 7 碎斑流纹岩锆石阴极发光图像
图中实心圈与虚线圈分别代表锆石U⁃Pb测年测点位置和Lu⁃Hf同位素测点位置
Fig. 7. Zircon CL images of porphyroclastic rhyolites
图 8 鹅湖岭组与打鼓顶组碎斑流纹岩LA⁃ICP⁃MS锆石U⁃Pb年龄谐和图及加权平均年龄
Fig. 8. LA⁃ICP⁃MS zircon U⁃Pb age concordia diagram and average⁃weighted age of porphyroclastic rhyolites from Ehuling Formation and Daguding Formation
图 9 碎斑流纹岩结晶分异图解
Ap.磷灰石；Aln.褐帘石；Mnz.独居石；Zr.锆石；底图据郭福生等（2016）
Fig. 9. Diagram of fractional crystallization of porphyroclastic rhyolite
图 10 鹅湖岭组与打鼓顶组碎斑流纹岩锆石206Pb/238U年龄与εHf(t)关系
Fig. 10. Zircon 206Pb/238U age and εHf(t) diagram of porphyroclastic rhyolites from Ehuling Formation and Daguding Formation
表 1 鹅湖岭组与打鼓顶组碎斑流纹岩主量元素含量(%)及相关参数
Table 1. Major element compositions (%) and related parameters of porphyroclastic rhyolite from Ehuling Formation and Daguding Formation
样品号 岩性 层位 SiO2 TiO2 Al2O3 Fe2O3 FeO MnO MgO CaO Na2O K2O P2O5 烧失量* K2O+
Na2ONa2O/K2O SD4-1 鹅湖岭组
碎斑流纹岩K1e 73.30 0.26 12.85 0.39 1.58 0.03 0.41 1.49 2.43 5.18 0.06 1.80 7.61 0.47 SD4-9 76.29 0.11 12.43 0.23 1.07 0.04 0.18 0.59 2.83 5.26 0.03 0.74 8.09 0.54 SD4-10 76.32 0.11 12.33 0.05 1.23 0.04 0.17 0.79 2.90 5.19 0.03 0.65 8.09 0.56 SD4-12 76.30 0.12 12.36 0.33 1.06 0.04 0.20 0.78 2.69 5.38 0.03 0.57 8.07 0.50 SD4-14 75.90 0.11 11.95 0.42 0.8 0.04 0.17 1.13 2.73 5.15 0.03 1.44 7.88 0.53 SD4-16 76.08 0.09 12.05 0.40 0.84 0.04 0.19 0.81 2.80 5.19 0.02 1.34 7.99 0.54 SD4-18 76.89 0.09 11.96 0.11 0.99 0.04 0.18 0.77 2.72 5.25 0.02 0.81 7.97 0.52 SD4-43 77.01 0.12 12.14 0.04 1.36 0.04 0.26 0.58 2.93 4.82 0.03 0.46 7.75 0.61 SD4-54 76.82 0.08 12.1 0.18 1.01 0.05 0.20 0.79 3.01 4.79 0.02 0.80 7.80 0.63 SD4-55 76.42 0.01 12.14 0.34 0.92 0.05 0.22 0.75 3.07 4.97 0.02 0.86 8.04 0.62 SD4-57 76.69 0.08 11.99 0.22 0.94 0.06 0.20 0.87 3.10 4.77 0.02 0.89 7.87 0.65 SD4-63 74.71 0.19 12.56 0.70 1.41 0.16 0.56 0.93 2.31 4.25 0.05 1.99 6.56 0.54 SD4-97 打鼓顶组
碎斑流纹岩K1d 76.59 0.08 11.15 0.68 0.63 0.07 0.26 1.42 3.54 3.61 0.03 1.83 7.15 0.98 SD4-102 77.72 0.08 11.52 0.44 0.61 0.07 0.25 0.95 3.01 3.62 0.03 1.58 6.63 0.83 
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表 2 鹅湖岭组与打鼓顶组碎斑流纹岩微量元素含量(10-6)
Table 2. Trace element compositions (10-6) of porphyroclastic rhyolites from Ehuling Formation and Daguding Formation
样品号 岩性 层位 Cu Zn Rb Sr Mo Cd Sb Cs Ba W Tl Pb Bi Th U Nb Ta Zr Hf SD4-1 鹅湖岭组
碎斑流纹岩K1e 4.39 45.6 226 126 0.85 0.01 0.21 20.8 316 0.77 1.24 31.5 0.32 22.3 4.88 16.1 1.45 59.1 2.47 SD4-9 2.83 35.3 307 84.6 1.71 < 0.002 0.08 15.6 106 1.35 1.47 36.3 0.60 26.4 7.4 20 2.28 65.7 2.99 SD4-10 4.01 29.3 272 71.2 1.54 < 0.002 0.08 12.7 90.5 1.32 1.36 33.1 1.23 26.4 7.91 18.6 2.2 62.3 2.9 SD4-12 2.53 33.7 306 81.2 1.81 0.03 0.09 15 105 1.48 1.46 35.9 0.59 24.8 7.31 18.8 2.21 55.9 2.74 SD4-14 3.08 30.4 338 76.3 1.81 0.02 0.08 13.9 85.7 0.95 1.54 36.1 0.56 25.9 7.48 17.8 2.22 62.3 3.07 SD4-16 8.21 34.1 357 64.9 2.98 0.01 0.12 17.7 79.7 1.99 1.74 37.3 1.17 27.8 9.46 19 2.51 73.2 3.63 SD4-18 5.66 31 352 56 1.67 0.04 0.13 16.7 71.1 1.92 1.64 37.2 0.96 26.6 8.64 17.7 2.48 63.1 3.19 SD4-43 52.4 107 268 64.1 2.36 0.02 0.16 8.48 92 1.87 1.38 48.3 1.13 28.7 9.84 19.5 2.64 76.6 3.77 SD4-54 4.87 37.4 319 69.7 2.26 0.05 0.16 13.4 69.1 2.49 1.58 45.8 1.17 28 10.3 20.7 2.92 71.8 3.73 SD4-55 4.83 40.5 335 62.7 2.13 0.03 0.12 13.7 90.8 1.85 1.67 42.7 0.77 27.5 9.83 19.5 2.77 69.6 3.57 SD4-57 30.1 37 352 45.9 2.16 0.02 0.14 17 61.6 4.61 1.73 39.9 3.05 29.4 11.4 19.9 3.07 74.4 4.08 SD4-63 43.2 154 338 52.1 2.94 0.55 0.41 21.8 143 2.97 2.03 48.2 1.18 25.6 8.57 16.9 2.23 72.8 3.35 SD4-97 打鼓顶组
碎斑流纹岩K1d 2.89 51.1 169 61 0.215 0.15 0.22 8.85 96.1 0.99 0.93 29.6 0.09 26.4 4.43 23.4 1.51 101 4.71 SD4-102 1.94 41 169 50.4 0.213 0.05 0.20 9.95 69.5 0.85 1.08 35.6 0.05 25 4.36 22.9 1.48 93.9 4.38
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表 3 鹅湖岭组与打鼓顶组碎斑流纹岩稀土元素含量(10-6)及相关参数
Table 3. REE element compositions (10-6) and related parameters of porphyroclastic rhyolites from Ehuling Formation and Daguding Formation
样品号 岩性 La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Y ΣREE LREE HREE LREE/
HREEδEu SD4-1 鹅湖岭组
碎斑流纹岩58.5 109.0 12.50 45.3 8.10 0.94 6.47 1.02 5.08 0.92 2.51 0.40 2.56 0.37 24.9 253.67 234.34 19.33 12.13 0.40 SD4-9 40.7 79.9 9.77 35.7 7.48 0.56 5.79 1.02 4.95 0.88 2.37 0.38 2.44 0.36 24.1 192.29 174.11 18.19 9.57 0.26 SD4-10 34.8 69.3 8.47 31.5 6.79 0.48 5.52 0.96 4.79 0.86 2.28 0.37 2.38 0.34 23.1 168.83 151.34 17.49 8.65 0.24 SD4-12 34.5 69.0 8.38 31.7 6.80 0.51 5.39 0.93 4.47 0.79 2.19 0.35 2.29 0.32 21.9 167.61 150.89 16.73 9.02 0.26 SD4-18 25.1 52.7 6.60 25.5 6.03 0.38 4.70 0.82 4.27 0.79 2.11 0.36 2.34 0.34 20.9 132.05 116.31 15.74 7.39 0.22 SD4-21 24.4 50.7 6.52 25.6 6.13 0.35 5.05 0.95 4.92 0.93 2.63 0.45 2.99 0.45 26.6 132.06 113.70 18.36 6.19 0.19 SD4-26 20.9 43.9 5.77 22.9 6.26 0.32 5.25 1.04 5.80 1.13 3.21 0.58 3.77 0.56 30.3 121.39 100.05 21.34 4.69 0.17 SD4-43 27.2 56.3 7.03 27.8 6.68 0.42 6.16 1.28 6.95 1.44 4.01 0.73 4.60 0.65 39.1 151.25 125.43 25.83 4.86 0.20 SD4-48 27.6 58.0 7.42 29.3 7.61 0.36 7.02 1.44 8.44 1.73 4.79 0.88 5.56 0.82 46.6 160.96 130.29 30.67 4.25 0.15 SD4-54 25.0 53.0 6.61 26.3 6.59 0.37 5.84 1.18 6.80 1.32 3.87 0.71 4.46 0.64 38.2 142.69 117.87 24.82 4.75 0.18 SD4-55 25.6 53.7 6.72 26.9 6.62 0.38 5.84 1.21 6.86 1.36 3.89 0.71 4.46 0.63 38.0 144.88 119.92 24.96 4.80 0.18 SD4-57 23.0 49.3 6.30 25.7 6.85 0.32 6.39 1.39 8.18 1.65 4.79 0.88 5.42 0.80 47.3 140.97 111.47 29.50 3.78 0.15 SD4-63 23.8 47.2 5.83 22.9 5.36 0.44 4.96 0.99 5.68 1.12 3.24 0.59 3.84 0.56 31.8 126.52 105.53 20.99 5.03 0.26 SD4-97 打鼓顶组
碎斑流纹岩34.9 67.3 8.16 32.0 6.10 1.25 4.82 0.75 3.37 0.61 1.68 0.29 1.95 0.30 21.2 163.47 149.71 13.76 10.88 0.71 SD4-102 26.0 50.1 6.06 23.7 4.51 1.11 3.89 0.6 3.06 0.52 1.54 0.28 1.67 0.24 21.4 123.28 111.48 11.80 9.45 0.81
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表 4 鹅湖岭组与打鼓顶组碎斑流纹岩LA⁃ICP⁃MS锆石U⁃Pb测年分析结果
Table 4. LA⁃ICP⁃MS zircons U⁃Pb data of porphyroclastic rhyolites from Ehuling Formation and Daguding Formation
样品号及
点号元素含量(10-6) Th/U 同位素比值 同位素年龄(Ma) Th U 207Pb/
206Pb1σ 207Pb/
235U1σ 206Pb/
238U1σ 207Pb/
206Pb1σ 207Pb/
235U1σ 206Pb/
238U1σ 鹅湖岭组碎斑流纹岩(样品号SD3-62) SD3-62-1 69.21 110.22 0.63 0.051 65 0.001 75 0.148 00 0.004 25 0.020 78 0.000 25 270.0 75.9 140.1 3.8 132.6 1.6 SD3-62-2 117.76 221.58 0.53 0.051 30 0.001 31 0.1459 9 0.002 71 0.020 64 0.000 23 254.2 57.7 138.4 2.4 131.7 1.5 SD3-62-3 71.35 133.1 0.54 0.049 33 0.001 61 0.142 59 0.003 88 0.020 96 0.000 25 163.5 74.5 135.3 3.5 133.7 1.6 SD3-62-4 195.06 670.31 0.29 0.048 90 0.001 10 0.138 28 0.001 98 0.020 51 0.000 23 142.9 52.1 131.5 1.8 130.9 1.4 SD3-62-5 133.00 315.54 0.42 0.051 81 0.001 36 0.148 26 0.002 88 0.020 75 0.000 24 277.1 59.0 140.4 2.6 132.4 1.5 SD3-62-6 142.98 563.75 0.25 0.049 81 0.001 13 0.140 57 0.002 03 0.020 47 0.000 23 186.0 51.8 133.6 1.8 130.6 1.4 SD3-62-7 73.88 157.82 0.47 0.047 46 0.001 41 0.136 84 0.003 27 0.020 91 0.000 24 71.6 69.9 130.2 2.9 133.4 1.5 SD3-62-8 100.22 226.02 0.44 0.156 68 0.003 59 0.526 77 0.007 69 0.024 38 0.000 28 2 420.2 38.3 429.7 5.1 155.3 1.8 SD3-62-9 94.95 186.49 0.51 0.047 40 0.001 25 0.136 28 0.002 69 0.020 85 0.000 24 68.7 62.3 129.7 2.4 133.0 1.5 SD3-62-10 127.08 194.99 0.65 0.049 43 0.001 41 0.141 60 0.003 18 0.020 77 0.000 24 168.2 65.5 134.5 2.8 132.5 1.5 SD3-62-11 86.05 226.95 0.38 0.050 84 0.001 40 0.146 31 0.003 09 0.020 87 0.000 24 233.7 62.3 138.6 2.7 133.1 1.5 SD3-62-12 82.52 292.47 0.28 0.050 26 0.001 23 0.144 24 0.002 46 0.020 81 0.000 23 207.2 55.7 136.8 2.2 132.8 1.5 SD3-62-13 159.21 206.62 0.77 0.049 05 0.001 34 0.140 33 0.002 92 0.020 75 0.000 24 150.1 62.6 133.3 2.6 132.4 1.5 SD3-62-14 173.97 226.97 0.77 0.049 39 0.001 27 0.141 09 0.002 64 0.020 71 0.000 23 166.3 58.8 134.0 2.3 132.2 1.5 SD3-62-15 55.65 110.21 0.50 0.088 34 0.002 65 0.269 76 0.006 42 0.022 14 0.000 28 1 389.8 56.3 242.5 5.1 141.2 1.7 SD3-62-16 124.74 276.92 0.45 0.049 86 0.001 27 0.142 56 0.002 62 0.020 73 0.000 23 188.5 58.1 135.3 2.3 132.3 1.5 SD3-62-17 153.03 694.59 0.22 0.052 39 0.001 20 0.148 41 0.002 21 0.020 54 0.000 23 302.7 51.3 140.5 1.9 131.1 1.4 SD3-62-18 102.15 232.28 0.44 0.050 24 0.001 41 0.144 36 0.003 13 0.020 84 0.000 24 206.0 63.7 136.9 2.9 132.9 1.5 SD3-62-19 88.04 193.50 0.45 0.051 52 0.001 49 0.148 41 0.003 40 0.020 89 0.000 24 263.9 65.1 140.5 3.0 133.3 1.5 SD3-62-20 110.91 218.13 0.51 0.051 06 0.001 38 0.146 42 0.003 01 0.020 80 0.000 24 243.3 61.2 138.7 2.7 132.7 1.5 SD3-62-21 83.12 215.90 0.38 0.050 56 0.001 40 0.145 14 0.003 09 0.020 82 0.000 24 220.8 62.7 137.6 2.7 132.8 1.5 SD3-62-22 100.78 219.85 0.46 0.045 78 0.001 60 0.131 35 0.003 92 0.020 81 0.000 25 0.1 67.4 125.3 3.5 132.7 1.6 SD3-62-23 134.42 205.38 0.65 0.051 35 0.001 29 0.147 35 0.002 66 0.020 81 0.000 23 256.4 56.8 139.6 2.4 132.8 1.5 SD3-62-24 108.39 153.64 0.71 0.052 83 0.001 49 0.152 85 0.003 34 0.020 98 0.000 24 321.4 62.6 144.4 2.9 133.8 1.5 SD3-62-25 33.92 69.94 0.48 0.045 46 0.002 09 0.132 80 0.005 61 0.021 18 0.000 27 0.1 76.2 126.6 5.0 135.1 1.7 打鼓顶组碎斑流纹岩(样品号：SD3-211) SD3-211-1 191.6 356.57 0.54 0.050 91 0.001 19 0.153 48 0.002 38 0.021 86 0.000 24 236.9 53.1 145.0 2.1 139.4 1.5 SD3-211-2 157.62 420.57 0.37 0.048 73 0.001 20 0.137 28 0.002 37 0.020 43 0.000 23 134.9 56.8 130.6 2.1 130.4 1.4 SD3-211-3 655.08 643.40 1.02 0.049 52 0.001 19 0.140 78 0.002 33 0.020 61 0.000 23 172.4 55.3 133.7 2.1 131.5 1.4 SD3-211-4 174.43 662.16 0.26 0.048 52 0.001 09 0.138 41 0.001 95 0.020 68 0.000 22 124.9 51.9 131.6 1.7 132.0 1.4 SD3-211-5 102.57 237.11 0.43 0.052 56 0.001 37 0.153 60 0.002 95 0.021 19 0.000 24 309.7 58.1 145.1 2.6 135.2 1.5 SD3-211-6 170.69 336.24 0.51 0.048 37 0.001 18 0.137 51 0.002 35 0.020 61 0.000 23 117.6 56.6 130.8 2.1 131.5 1.4 SD3-211-7 127.00 306.03 0.41 0.051 01 0.001 24 0.145 24 0.002 45 0.020 65 0.000 23 241.2 55.0 137.7 2.2 131.7 1.4 SD3-211-8 436.89 1143.63 0.38 0.069 06 0.001 49 0.197 33 0.002 56 0.020 72 0.000 23 900.5 44.0 182.9 2.2 132.2 1.4 SD3-211-9 148.85 407.71 0.37 0.049 95 0.001 16 0.141 72 0.002 21 0.020 57 0.000 23 192.8 53.3 134.6 2.0 131.3 1.4 SD3-211-10 85.47 160.61 0.53 0.043 99 0.001 45 0.126 14 0.003 49 0.020 79 0.000 25 0.1 0.00 120.6 3.1 132.7 1.6 SD3-211-11 130.72 509.02 0.26 0.050 62 0.001 15 0.144 61 0.002 11 0.020 71 0.000 23 223.7 51.5 137.1 1.9 132.2 1.4 SD3-211-12 94.05 288.59 0.33 0.066 86 0.001 50 0.211 97 0.003 02 0.022 99 0.000 25 833.5 46.0 195.2 2.5 146.5 1.6 SD3-211-13 105.68 249.55 0.42 0.046 65 0.001 24 0.133 97 0.002 70 0.020 82 0.000 24 31.5 61.7 127.7 2.4 132.8 1.5 SD3-211-14 151.35 336.84 0.45 0.050 32 0.001 24 0.142 65 0.002 50 0.020 56 0.000 23 209.8 56.1 135.4 2.2 131.2 1.5 SD3-211-15 79.16 175.71 0.45 0.046 69 0.001 31 0.134 64 0.002 98 0.020 91 0.000 24 33.3 65.1 128.3 2.7 133.4 1.5 SD3-211-16 190.95 598.10 0.32 0.048 21 0.001 08 0.137 50 0.001 99 0.020 68 0.000 23 109.5 52.1 130.8 1.8 132.0 1.4 SD3-211-17 88.66 150.74 0.59 0.048 69 0.001 42 0.148 16 0.003 45 0.022 07 0.000 26 132.8 67.0 140.3 3.1 140.7 1.6 SD3-211-18 63.05 136.16 0.46 0.051 56 0.001 39 0.158 48 0.003 28 0.022 29 0.000 26 266.0 60.8 149.4 2.9 142.1 1.6 SD3-211-19 132.38 433.81 0.31 0.049 07 0.001 12 0.138 98 0.002 10 0.020 54 0.000 23 151.3 52.6 132.1 1.9 131.0 1.4 SD3-211-20 109.83 270.89 0.41 0.051 61 0.001 26 0.149 13 0.002 60 0.020 95 0.000 24 268.4 55.1 141.1 2.3 133.7 1.5 SD3-211-21 81.09 165.03 0.49 0.053 20 0.001 44 0.150 02 0.003 13 0.020 45 0.000 24 337.5 60.3 141.9 2.8 130.5 1.5 SD3-211-22 115.00 245.05 0.47 0.046 59 0.001 25 0.133 55 0.002 76 0.020 79 0.000 24 28.1 62.4 127.3 2.5 132.6 1.5 SD3-211-23 152.48 307.34 0.50 0.051 67 0.001 17 0.152 76 0.002 28 0.021 44 0.000 24 270.9 51.1 144.3 2.0 136.7 1.5 SD3-211-24 130.57 380.93 0.34 0.054 02 0.001 39 0.151 87 0.002 89 0.020 39 0.000 23 371.7 56.6 143.6 2.6 130.1 1.5 SD3-211-25 81.56 170.08 0.48 0.050 21 0.001 37 0.144 11 0.003 03 0.020 81 0.000 24 204.8 61.9 136.7 2.7 132.8 1.5
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表 5 鹅湖岭组与打鼓顶组碎斑流纹岩Lu⁃Hf同位素分析结果
Table 5. Lu⁃Hf isotopic data of porphyroclastic rhyolite from Ehuling Formation and Daguding Formation
样品测点号 t
(Ma)176Yb/177Hf 176Lu/177Hf 2σ 176Hf/177Hf 2σ εHf(0) εHf(t) tDM(Ma) tDMC
(Ma)fLu/Hf 鹅湖岭组碎斑流纹岩(样品号SD3-62) SD3-62-1 132.6 0.029 988 0.001 170 0.000 008 0.282 433 0.000 023 -11.98 -9.18 1 161 1 769 -0.96 SD3-62-2 131.7 0.021 733 0.000 834 0.000 006 0.282 536 0.000 016 -8.35 -5.52 1 008 1 539 -0.97 SD3-62-3 133.7 0.017 610 0.000 705 0.000 003 0.282 467 0.000 015 -10.78 -7.92 1 100 1 690 -0.98 SD3-62-4 130.9 0.013 598 0.000 540 0.000 006 0.282 500 0.000 012 -9.61 -6.78 1 049 1 616 -0.98 SD3-62-5 132.4 0.024 355 0.000 982 0.000 002 0.282 467 0.000 015 -10.80 -7.99 1 108 1 692 -0.97 SD3-62-6 130.6 0.019 147 0.000 758 0.000 006 0.282 468 0.000 013 -10.76 -7.95 1 100 1 690 -0.98 SD3-62-7 133.4 0.021 721 0.000 879 0.000 005 0.282 499 0.000 016 -9.66 -6.80 1 060 1 619 -0.97 SD3-62-8 133.0 0.030 149 0.001 152 0.000 003 0.282 509 0.000 015 -9.30 -6.49 1 054 1 599 -0.97 SD3-62-9 132.5 0.026 411 0.001 019 0.000 007 0.282 538 0.000 015 -8.26 -5.44 1 009 1 533 -0.97 SD3-62-10 133.1 0.016 663 0.000 652 0.000 001 0.282 451 0.000 011 -11.35 -8.50 1 121 1 727 -0.98 SD3-62-11 132.8 0.012 534 0.000 498 0.000 003 0.282 424 0.000 016 -12.32 -9.46 1 154 1 787 -0.99 SD3-62-12 132.4 0.029 903 0.001 119 0.000 010 0.282 566 0.000 019 -7.27 -4.45 972 1 470 -0.97 SD3-62-13 132.2 0.026 309 0.001 030 0.000 013 0.282 486 0.000 016 -10.13 -7.32 1 083 1 651 -0.97 SD3-62-14 132.3 0.021 373 0.000 844 0.000 003 0.282 496 0.000 015 -9.76 -6.93 1 064 1 628 -0.97 打鼓顶组碎斑流纹岩(样品号SD3-211) SD3-211-1 132.5 0.023 517 0.000 911 0.000 003 0.282 399 0.000 018 -13.18 -10.35 1 200 1 843 -0.97 SD3-211-2 130.4 0.015 427 0.000 610 0.000 002 0.282 402 0.000 016 -13.08 -10.26 1 187 1 837 -0.98 SD3-211-3 131.5 0.077 555 0.002 818 0.000 029 0.282 320 0.000 023 -15.98 -13.35 1 380 2 030 -0.92 SD3-211-4 132.0 0.015 915 0.000 631 0.000 005 0.282 429 0.000 013 -12.15 -9.30 1 151 1 777 -0.98 SD3-211-5 135.2 0.013 182 0.000 519 0.000 004 0.282 460 0.000 016 -11.02 -8.10 1 104 1 704 -0.98 SD3-211-6 131.5 0.033 978 0.001 296 0.000 015 0.282 404 0.000 017 -13.00 -10.23 1 206 1 835 -0.96 SD3-211-7 131.7 0.020 091 0.000 791 0.000 001 0.282 438 0.000 013 -11.81 -8.99 1 143 1 757 -0.98 SD3-211-8 132.2 0.049 472 0.001 857 0.000 024 0.282 293 0.000 151 -16.95 -14.22 1 384 2 087 -0.94 SD3-211-9 131.3 0.018 276 0.000 718 0.000 007 0.282 447 0.000 012 -11.50 -8.68 1 128 1 736 -0.98 SD3-211-10 132.7 0.020 658 0.000 811 0.000 002 0.282 424 0.000 015 -12.30 -9.46 1 163 1 788 -0.98 SD3-211-11 132.2 0.017 028 0.000 670 0.000 002 0.282 395 0.000 011 -13.33 -10.47 1 199 1 852 -0.98 SD3-211-12 132.8 0.032 942 0.001 272 0.000 009 0.282 445 0.000 015 -11.58 -8.79 1 148 1 744 -0.96 SD3-211-13 131.2 0.016 687 0.000 653 0.000 009 0.282 388 0.000 013 -13.59 -10.77 1 209 1 870 -0.98 SD3-211-14 133.4 0.027 795 0.001 066 0.000 006 0.282 424 0.000 018 -12.31 -9.48 1 171 1 789 -0.97
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