Petrogenesis of diabase from Jiangshiqiao in Taojiang City, Hu'nan Province:Constrains from geochemistry, geochronology and Sr-Nd-Pb isotopes
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摘要:
对湖南桃江地区江石桥辉绿岩进行了LA-ICP-MS锆石U-Pb定年，获得的岩浆侵位年龄为229±2.3Ma（n=8，MSWD=1.8，2σ）。其低钾（K2O/Na2O=0.14~0.16），贫碱（K2O+Na2O=2.89%~2.96%），富集大离子亲石元素（Rb、Ba、Th、U），亏损高场强元素（Nb、Ta、Ti），呈轻稀土元素弱富集，无Eu、Ce异常，富集放射性成因Pb，低（87Sr/86Sr）i（0.706052~0.706437），较低正ε Nd（t）（1.54~1.86）的特征，表明岩石来源于下地壳物质和亏损地幔的混合源区。综合前人的研究结果认为，在印支运动造山后的伸展背景下，软流圈上涌导致区域下地壳及部分地幔物质发生熔融，形成辉绿岩岩浆并向上侵位而成。
Abstract:Zircon LA-ICP-MS U-Pb dating for diabase from Jiangshiqiao in Taojiang City of Hu'nan Province yielded an emplace-ment age of 229±2.3Ma (n=8, MSWD=1.8, 2σ).The diabase is characterized by low values of potassium (K2O/Na2O=0.14~0.16), and alkali (K2O+Na2O=2.89%~2.96%), enrichment of large ion lithophile elements and LREE and depletion of high field strength el-ements, low (87Sr/86Sr)i ratios (0.70606~0.70644), low positive ε Nd(t) values (1.55~1.87) and enrichment of radioactive Pb, suggesting a mixed source of the depleted mantle (DM) and the lower crustal.In combination with previous studies, the authors hold that the di-abase was formed through partial melt of the mantle and lower crustal components by the upwelling asthenosphere during the Indo-sinian post-orogenic lithosphere extension in Hu'nan Province.
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Keywords:
- diabase /
- geochemistry /
- geochronology /
- Sr-Nd-Pb isotopes /
- petrogenesis /
- Taojiang
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致谢: 锆石U-Pb同位素和全岩微量元素分析分别得到了中国地质大学（武汉）地质过程与矿产资源国家重点实验室胡兆初研究员和陈海红老师的帮助，Sr-Nd同位素测试得到了中国地质调查局武汉地质调查中心梅玉萍工程师的帮助，湖南省地质矿产勘查开发局四一三队熊安本工程师参与了野外工作，审稿专家对本文提出了宝贵的修改意见，在此一并致谢。
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图 2 桃江地区江石桥辉绿岩野外和显微照片
Pl—斜长石；Px—辉石；Chl—绿泥石
Figure 2. Photograph and photomicrographs of the diabase from Jiangshiqiao in the Taojiang area
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图 3 桃江地区江石桥辉绿岩中典型锆石阴极发光图像
Figure 3. Representative cathodoluminescence (CL) images for zircons of the diabase from Jiangshiqiao in the Taojiang area
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图 4 桃江地区江石桥辉绿岩锆石U-Pb谐和图
Figure 4. U-Pb concordia diagrams for zircons of the diabase from Jiangshiqiao in the Taojiang area
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图 5 辉绿岩TAS分类图(a，底图据参考文献[45])和SiO2-K2O图解（b）
Figure 5. TAS classification (a) and SiO2-K2O (b) diagrams of diabase
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图 6 桃江地区江石桥辉绿岩球粒陨石标准化稀土元素配分模式图(a)和原始地幔标准化蛛网图(b)(标准化值据参考文献[46])
Figure 6. Chondrite-normalized REE patterns (a) and primitive mantle-normalized trace element spidergrams (b) of the diabase from Jiangshiqiao in the Taojiang area
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图 7 桃江地区江石桥辉绿岩87Sr/86Sr-143Nd/144Nd(a)和206Pb/204Pb-207Pb/204Pb(b)图解（底图据参考文献[49]）
DM—亏损地幔；BSE—全硅酸盐地球；EMⅠ和EMⅡ—富集地幔；HIMU—具有高U/Pb值的地幔；PREMA—经常观测到的普通地幔；MORB—大洋中脊玄武岩；NHRL—北半球参考线
Figure 7. 87Sr/86Sr-143Nd/144Nd (a) and 206Pb/204Pb-207Pb/204Pb (b) diagrams of the diabase from Jiangshiqiao in the Taojiang area
表 1 桃江地区江石桥辉绿岩LA-ICP-MS锆石U-Th-Pb同位素分析结果
Table 1 LA-ICP-MS U-Th-Pb isotope analyses of zircons from the diabase from Jiangshiqiao in the Taojiang area
点号 Pb/ 10-6 Th/ 10-6 U/ 10-6 Th/ U 同位素比值 同位素年龄/Ma 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 1 178 707 2357 0.30 0.055 0.002 0.27 0.01 0.0356 0.0004 409 60 244 8 225 2 2 311 1164 3556 0.33 0.061 0.001 0.30 0.01 0.0359 0.0003 640 36 270 5 227 2 3 125 377 1238 0.30 0.072 0.002 0.36 0.01 0.0360 0.0003 974 46 310 7 228 2 4 175 728 2256 0.32 0.051 0.001 0.25 0.01 0.0360 0.0004 239 42 230 5 228 2 5 164 690 1799 0.38 0.053 0.001 0.27 0.01 0.0362 0.0003 318 39 239 5 229 2 6 262 978 2256 0.43 0.064 0.001 0.32 0.01 0.0364 0.0003 740 34 285 6 231 2 7 182 629 2301 0.27 0.056 0.001 0.29 0.01 0.0366 0.0003 458 39 255 5 232 2 8 142 630 1449 0.43 0.052 0.001 0.27 0.01 0.0371 0.0005 280 38 240 6 235 3 9 112 140 532 0.26 0.063 0.002 0.92 0.03 0.1046 0.0009 717 44 660 13 641 5 10 39 60 133 0.45 0.061 0.002 0.90 0.04 0.1066 0.0012 637 69 649 20 653 7 11 54 86 68 1.27 0.073 0.003 1.27 0.05 0.1265 0.0015 1027 64 832 24 768 9 12 74 111 155 0.71 0.075 0.003 1.34 0.05 0.1299 0.0013 1064 55 861 21 787 7 13 86 127 129 0.99 0.068 0.003 1.21 0.04 0.1298 0.0015 866 56 807 20 787 9 14 139 184 224 0.82 0.072 0.002 1.41 0.04 0.1403 0.0013 997 39 891 16 846 7 15 98 96 330 0.29 0.077 0.002 1.54 0.04 0.1442 0.0012 1124 39 948 16 868 7 16 17.1 21.3 46 0.46 0.065 0.004 1.29 0.07 0.1453 0.0021 760 95 841 32 874 12 17 377 431 554 0.78 0.084 0.002 1.95 0.05 0.1688 0.0017 1281 38 1098 18 1006 9 18 214 246 284 0.87 0.076 0.002 1.87 0.05 0.1794 0.0014 1082 36 1071 16 1063 7 19 279 181 527 0.34 0.088 0.002 2.99 0.06 0.2437 0.0020 1391 24 1404 15 1406 11 20 266 203 207 0.98 0.098 0.002 3.70 0.08 0.2740 0.0023 1579 29 1572 18 1561 12 21 181 138 170 0.81 0.105 0.002 4.32 0.10 0.2972 0.0023 1715 30 1698 19 1677 11 22 636 352 441 0.80 0.121 0.003 6.51 0.16 0.3864 0.0031 1974 33 2047 22 2106 14 
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表 2 桃江地区江石桥辉绿岩主量、微量和稀土元素含量
Table 2 Major, trace and rare earth elements composition of the diabase from Jiangshiqiao in the Taojiang area
样品号 SiO2 TiO2 Al2O3 Fe2O3 MgO FeO MnO CaO Na2O K2O P2O5 H2O+ CO2 Σ Sc V JSQ04-1 50.18 0.12 16.99 2.39 7.42 6.75 0.14 9.13 2.56 0.40 0.14 2.78 0.55 99.55 34.5 206 JSQ04-2 49.65 0.12 17.02 3.10 7.91 6.05 0.13 9.29 2.53 0.41 0.14 2.89 0.28 99.52 32.9 205 JSQ04-3 50.55 0.12 17.16 2.56 7.53 5.95 0.14 9.43 2.54 0.40 0.15 2.82 0.42 99.77 34.1 206 JSQ04-4 49.94 0.12 17.08 7.73 7.90 1.97 0.14 8.97 2.53 0.36 0.14 2.80 0.14 99.82 34.4 203 样品号 Cr Co Ni Cu Zn Sr Rb Ba U Th Pb Nb Ta Zr Hf La JSQ04-1 289 47.3 159 80.8 72.1 259 10.8 163 0.32 2.17 4.43 4.54 0.30 115 2.76 9.73 JSQ04-2 293 47.0 157 78.2 71.6 253 12.1 165 0.32 1.98 3.83 4.31 0.27 112 2.69 9.39 JSQ04-3 296 47.1 152 79.2 72.0 248 8.90 131 0.33 2.19 4.03 4.56 0.31 114 2.82 10.1 JSQ04-4 296 48.0 153 82.0 69.6 250 7.44 191 0.29 2.08 6.56 4.31 0.27 110 2.65 9.39 样品号 Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Y JSQ04-1 22.4 2.92 12.8 3.27 1.16 3.99 0.68 4.61 0.92 2.82 0.39 2.72 0.42 26.6 JSQ04-2 22.1 2.81 12.6 3.18 1.21 3.99 0.68 4.46 0.92 2.81 0.39 2.73 0.40 26.5 JSQ04-3 23.2 2.98 13.1 3.31 1.20 4.08 0.70 4.69 0.97 2.81 0.41 2.79 0.42 26.9 JSQ04-4 21.8 2.89 12.4 3.11 1.20 4.13 0.69 4.55 0.94 2.78 0.40 2.69 0.40 26.0 注：主量元素含量单位为%，微量和稀土元素为10-6
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表 3 桃江地区江石桥辉绿岩素Sr、Nd、Pb同位素组成
Table 3 Sr, Nd and Pb isotopic compositions of the diabase from Jiangshiqiao in the Taojiang area
样品号 87Rb/86Sr 87Sr/86Sr
(2σ)147Sm/144Nd 143Nd/144Nd
(2σ)(87Sr/86Sr)i (143Nd/144Nd)i εNd(t) tDM/Ga tDMc/Ga 208Pb/204Pb (2σ) 207Pb/204Pb (2σ) 206Pb/204Pb (2σ) 208Pb/206Pb 207Pb/206Pb JSQ04-1 0.122 0.70645±4 0.157071 0.512666±7 0.706054 0.512431 1.71 1.30 0.77 38.805±7 15.625±2 18.329±3 2.117 0.852 JSQ04-2 0.139 0.70663±8 0.157235 0.512669±3 0.706179 0.512433 1.76 1.30 0.77 38.589±13 15.563±6 18.266±6 2.113 0.852 JSQ04-3 0.104 0.70660±7 0.155812 0.512656±3 0.706262 0.512422 1.55 1.30 0.78 38.521±12 15.839±5 18.259±6 2.110 0.867 JSQ04-4 0.090 0.70673±4 0.157441 0.512675±6 0.706438 0.512439 1.87 1.29 0.76 38.507±10 15.561±4 18.262±4 2.109 0.852 注：87Rb/86Sr和147Sm/144Nd值据同位素稀释法测试的Rb、Sr、Sm、Nd含量和Sr、Nd同位素组成计算；球粒陨石均一储库(CHUR)组成：87Rb/86Sr=0.0827，87Sr/86Sr=0.7045，147Sm/144Nd=0.1967，143Nd/144Nd=0.512638；亏损地幔(DM)取值：147Sm/144Nd=0.2137，143Nd/144Nd=0.51315；大陆地壳(CC)取值：147Sm/144Nd=0.118, lRb= 1.42×10-11·a-1，lSm=6.54×10-12 ·a-1；同位素初始比值为t=100Ma时比值；(87Sr/86Sr)i和(143Nd/144Nd)i分别代表初始Sr和Nd同位素比值
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