Taohong Diorite from Pingshui Region in Eastern Jiangnan Orogen: Evidence for Early Neoproterozoic Oceanic Crust Subduction
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摘要: 平水一带早新元古代岩浆岩的精细年代学约束及其形成构造背景的厘定是理清华南内部新元古代演化机制的重要突破口.对江南造山带东段平水地区桃红岩体中的闪长岩进行了详细的锆石U-Pb年代学(LA-ICP-MS)、全岩地球化学和Sr-Nd同位素研究，结果显示：闪长岩锆石U-Pb年龄为913±2 Ma和898±2 Ma，代表其形成年龄；去掉挥发分并百分化处理后，SiO2、Al2O3、Na2O和K2O含量分别为58.33%~63.36%、15.76%~17.42%、2.62%~3.12%和0.53%~1.53%，属低钾-中钾系列；铝饱和指数(A/CNK) 为0.84~0.92，属偏铝质；轻重稀土分异明显((La/Yb)N=4.65~6.09)、轻微Eu异常(δEu=0.82~1.01)、高场强元素(Nb、Ta、Ti、P) 强烈亏损、大离子亲石元素(Rb、Ba、K、Sr) 相对富集，具岛弧岩浆亲缘性；具低(87Sr/86Sr)i值(0.703 060~0.703 076)、高εNd(t) 值(+6.58~+6.76).综合研究认为桃红闪长岩为扬子与华夏陆块之间的古洋壳南东向俯冲的过程中，被俯冲板片流体和熔体改造的地幔楔橄榄岩部分熔融的产物；双溪坞群及其同期岩浆岩应是扬子与华夏陆块早期拼合阶段的产物，与格林威尔构造事件无关.Abstract: The fine chronological constraints and the determination of tectonic setting of the Early Neoproterozoic magmatic rocks in the Pingshui area are important breakthroughs for the Neoproterozoic evolution mechanism in South China. This paper presents a synthesis of zircon U-Pb geochronological, whole rock elementaland Sr-Nd isotopic geochemistry study on the Taohong diorite from Pingshui region along the Eastern Jiangnan Orogen. Two representative samples yielded weighed mean 206Pb/238U ages of 913±2 Ma and 898±2 Ma, respectively, representing the crystallization ages of the dioritic pluton. In the case of loss on ignition free, the dioritic samples are characterized by SiO2 of 58.33%-63.36%, Al2O3 of 15.76%-17.42%, Na2O of 2.62%-3.12%, K2O of 0.53%-1.53% and A/CNK of 0.84-0.92, classified as low to medium-K metaluminous series. Their chondrite-normalized rare earth elements (REEs) patterns exhibit a right-sloping tendency with more enriched light rare earth elements (LREEs) relative to heavy rare earth elements (HREEs) ((La/Yb)N=4.65-6.09) and slightly Eu abnormality (δEu=0.82-1.01). On the primitive mantle-normalized multi-elements patterns, these samples have strong enrichment in large iron lithophile elements (LILEs) (Rb, Ba, K and Sr) and depletion in high field-strength elements (HFSEs) with marked negative Nb, Ta and Ti, similar to those of typical arc magmatites. The samples show low (87Sr/86Sr)i of 0.703 060-0.703 076 ratio and high positive εNd(t) of +6.58 to +6.76 values. It is inferred that the formation of the rocks is attributed to the partial melting of the mantle wedge peridotite, which was modified by the subducted slab-derived fluid and melt during the southeastwards subduction of ancient oceanic crust between the Yangtze and Cathaysia Block. In conjunction with previous studies, it is proposed that the Shuangxiwu Group along Eastern Jiangnan Orogen resulted from suturing of the Yangtze and Cathaysia Block, and is not related to Grenvillian Orogen in petrogenesis.
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Key words:
- diorites /
- subduction of oceanic crust /
- zircon U-Pb Dating /
- Sr-Nd isotope /
- Jiangnan Orogen /
- geochemistry
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图 1 华南新元古代地层简图(a) 和江南造山带东段平水地区地质简图(b)
图a据Wang et al.(2013b)；图b据浙江省地质矿产局(1996)
Fig. 1. Simplified geological maps of the Neoproterozoic basement of the Yangtze and Cathaysia Blocks (a) and Pingshui region in eastern Jiangnan Orogen (b)
图 2 桃红闪长岩样品13WY-147A (a) 和13WY-147B (b) 显微照片
Bt.黑云母；Pl.斜长石；Qz.石英；Ep.绿帘石；Chl.绿泥石；Spn.榍石
Fig. 2. Photomicrograph of Taohong diorite samples 13WY-147A (a) and 13WY-147B (b)
图 3 桃红闪长岩锆石U-Pb年龄谐和图和阴极发光图像(CL)
Fig. 3. Zircon U-PbConcordia diagramand CL images for the Taohong diorite samples
图 4 桃红闪长岩样品(a) SiO2-K2O图解，(b) A/CNK-A/NK图解，(c) SiO2-(Na2O+K2O) 图解和(d) QAP图解
图a据Middlemost (1985)；图b据Peccerillo and Taylor (1976)；图c据Middlemost (1994)；图d据Baker (1979)
Fig. 4. (a) SiO2-K2O, (b) A/CNK-A/NK, (c) SiO2-(Na2O+K2O) and (d) QAP classification diagrams for the Taohong diorite samples
图 5 桃红闪长岩哈克图解
图中埃达克型高镁安山岩/闪长岩数据来自Rapp et al.(1999)、Tatsumi (2006)和张玉芝等(2015)
Fig. 5. Hacker diagrams for the Taohong diorite samples
图 6 桃红闪长岩球粒陨石标准化稀土元素配分图(a) 和微量元素原始地幔标准化微量元素蛛网图(b)
球粒陨石和原始地幔标准化数据分别引自Taylor and Mclennan (1985)和Sun and McDonough (1989)
Fig. 6. The chondrite-normalized REE pattern (a) and PM-normalized spider diagram (b) for the Taohong diorite samples
图 7 桃红闪长岩(87Sr/86Sr)i-εNd(t) 关系(a)，SiO2-Nb/La关系(b)，SiO2-εNd(t) 关系(c) 和La-La/Sm关系(d)
MORB、BSE数据来自Hawkesworth et al.(1984)、Hart (1988)和Weaver (1991).AFC、FC和部分熔融趋势来自Wang et al.(2013c)和Zhang et al.(2013)
Fig. 7. The relations of (87Sr/86Sr)i-εNd(t)(a), SiO2-Nb/La (b), SiO2-εNd(t)(c) and La-La/Sm (d) for the Taohong diorite samples
图 8 桃红闪长岩SiO2-Mg#图解
底图据Cai et al.(2015)；图中1~4 GPa实验变玄武质和榴辉岩熔体的范围来自Rapp and Watson (1995)和Rapp et al.(1999)，0.8~1.6 GPa和1 000~1 050 ℃地壳熔体的范围来自Rapp and Watson (1995)和Sen and Dunn (1994)，0.7 GPa和825~852 ℃地壳熔体的范围来自Springer and Seck (1997)，幔源岩浆结晶分异形成的安山岩/闪长岩的范围来自Tatsumi (2006)，橄榄岩熔体和高镁安山岩/闪长岩范围来自Rapp et al.(1999)、Tatsumi (2006)和张玉芝等(2015)
Fig. 8. SiO2 versus Mg# for the Taohong diorite samples
图 9 桃红闪长岩Th/Yb-Nd/Yb关系(a) 和Zr/Yb-Nb/Yb关系(b)
Fig. 9. The relations of Th/Yb-Nd/Yb (a) and Zr/Yb-Nb/Yb (b) for the Taohong diorite samples
表 1 桃红闪长岩样品LA-ICP-MS锆石U-Pb分析结果
Table 1. Zircon LA-ICP-MS dating results for the Taohong diorite samples
分析点 Th (10-6) U (10-6) Th/U 同位素比值 年龄(Ma) 207Pb/206Pb 1 σ 207Pb/235U 1 σ 206Pb/238U 1 σ 207Pb/206Pb 1 σ 207Pb/235U 1 σ 206Pb/238U 1 σ 13WY-147A-01 188 383 0.49 0.069 55 0.000 24 1.459 58 0.015 05 0.152 26 0.001 57 917 6 914 6 914 9 13WY-147A-02 247 332 0.75 0.069 47 0.000 22 1.455 78 0.015 22 0.152 02 0.001 60 922 7 912 6 912 9 13WY-147A-03 207 305 0.68 0.069 57 0.000 28 1.459 93 0.014 71 0.152 24 0.001 48 917 8 914 6 913 8 13WY-147A-04 200 311 0.64 0.069 61 0.000 28 1.465 37 0.014 21 0.152 66 0.001 40 917 7 916 6 916 8 13WY-147A-05 203 432 0.47 0.069 63 0.000 27 1.459 93 0.014 79 0.152 25 0.001 58 917 8 914 6 914 9 13WY-147A-06 269 304 0.89 0.069 30 0.000 26 1.443 74 0.011 56 0.151 08 0.001 14 909 8 907 5 907 6 13WY-147A-07 206 361 0.57 0.069 43 0.000 25 1.450 39 0.013 86 0.151 61 0.001 45 922 7 910 6 910 8 13WY-147A-08 180 322 0.56 0.070 27 0.000 33 1.512 31 0.016 14 0.155 92 0.001 46 936 9 935 7 934 8 13WY-147A-09 167 321 0.52 0.069 68 0.000 33 1.472 76 0.014 41 0.153 26 0.001 35 920 9 919 6 919 8 13WY-147A-10 249 307 0.81 0.069 32 0.000 23 1.443 61 0.013 61 0.151 10 0.001 43 909 7 907 6 907 8 13WY-147A-11 196 322 0.61 0.069 57 0.000 28 1.463 21 0.012 71 0.152 53 0.001 23 917 8 915 5 915 7 13WY-147A-12 251 350 0.72 0.069 38 0.000 22 1.451 30 0.012 76 0.151 69 0.001 29 909 7 910 5 910 7 13WY-147A-13 193 286 0.67 0.069 57 0.000 36 1.462 24 0.014 13 0.152 56 0.001 38 917 11 915 6 915 8 13WY-147A-14 213 301 0.71 0.069 75 0.000 30 1.467 11 0.013 56 0.152 53 0.001 30 920 5 917 6 915 7 13WY-147A-15 213 326 0.65 0.074 30 0.000 61 1.546 91 0.016 76 0.151 71 0.001 62 1050 17 949 7 911 9 13WY-147A-16 283 302 0.94 0.069 49 0.000 21 1.458 56 0.013 95 0.152 18 0.001 42 922 7 913 6 913 8 13WY-147A-17 204 307 0.67 0.069 83 0.000 33 1.467 88 0.016 25 0.152 38 0.001 55 924 5 917 7 914 9 13WY-147A-18 212 318 0.67 0.069 39 0.000 31 1.449 13 0.014 61 0.151 54 0.001 46 909 9 910 6 910 8 13WY-147A-19 253 313 0.81 0.069 68 0.000 25 1.467 94 0.014 47 0.152 79 0.001 45 920 3 917 6 917 8 13WY-147A-20 169 341 0.50 0.070 01 0.000 29 1.471 25 0.013 24 0.152 44 0.001 28 928 9 919 5 915 7 13WY-147A-21 184 334 0.55 0.070 27 0.000 25 1.477 62 0.016 71 0.152 37 0.001 61 936 7 921 7 914 9 13WY-147A-22 257 294 0.87 0.069 60 0.000 27 1.461 50 0.011 52 0.152 34 0.001 14 917 7 915 5 914 6 13WY-147A-23 197 344 0.57 0.069 46 0.000 26 1.452 83 0.014 04 0.151 78 0.001 43 922 7 911 6 911 8 13WY-147A-24 161 367 0.44 0.069 89 0.000 26 1.479 24 0.014 60 0.153 64 0.001 52 924 8 922 6 921 8 13WY-147A-25 143 327 0.44 0.069 60 0.000 25 1.462 88 0.013 36 0.152 42 0.001 32 917 7 915 6 915 7 13WY-147A-26 166 393 0.42 0.069 58 0.000 18 1.462 00 0.014 64 0.152 41 0.001 52 917 5 915 6 914 9 13WY-147A-27 200 302 0.66 0.069 66 0.000 24 1.466 48 0.013 63 0.152 75 0.001 40 918 2 917 6 916 8 13WY-147A-28 184 323 0.57 0.071 97 0.000 47 1.491 23 0.016 70 0.150 71 0.001 65 985 13 927 7 905 9 13WY-147A-29 184 322 0.57 0.069 59 0.000 26 1.459 23 0.014 70 0.152 21 0.001 51 917 7 914 6 913 8 13WY-147A-30 185 273 0.68 0.069 61 0.000 31 1.457 74 0.013 81 0.152 05 0.001 41 917 9 913 6 912 8 13WY-147A-31 248 292 0.85 0.069 72 0.000 25 1.467 05 0.012 09 0.152 71 0.001 26 920 3 917 5 916 7 13WY-147A-32 243 369 0.66 0.069 84 0.000 27 1.478 29 0.013 60 0.153 60 0.001 38 924 7 922 6 921 8 13WY-147A-33 190 316 0.60 0.069 61 0.000 29 1.427 10 0.011 70 0.148 68 0.001 09 917 8 900 5 894 6 13WY-147A-34 267 340 0.79 0.06948 0.000 19 1.452 05 0.013 25 0.151 58 0.001 37 922 6 911 5 910 8 13WY-147A-35 248 308 0.81 0.069 62 0.000 25 1.460 84 0.015 56 0.152 31 0.001 58 917 7 914 6 914 9 13WY-147A-36 260 246 1.06 0.069 26 0.000 24 1.440 74 0.013 93 0.150 84 0.001 39 906 12 906 6 906 8 13WY-147A-37 294 309 0.95 0.069 99 0.000 27 1.495 67 0.012 69 0.154 93 0.001 18 928 40 929 5 929 7 13WY-147A-38 249 286 0.87 0.069 60 0.000 25 1.463 65 0.013 04 0.152 51 0.001 28 917 7 916 5 915 7 13WY-147A-39 243 303 0.80 0.069 52 0.000 23 1.460 27 0.013 46 0.152 32 0.001 34 915 6 914 6 914 8 13WY-147A-40 264 258 1.02 0.069 41 0.000 22 1.452 41 0.013 66 0.151 71 0.001 36 911 6 911 6 911 8 13wy-147B-01 177 263 0.67 0.068 51 0.000 23 1.412 70 0.013 19 0.149 00 0.001 35 883 12 894 6 895 8 13wy-147B-02 192 255 0.75 0.068 36 0.000 27 1.399 58 0.011 27 0.148 09 0.001 13 880 7 889 5 890 6 13wy-147B-03 162 270 0.60 0.069 06 0.000 28 1.435 39 0.013 30 0.150 40 0.001 30 902 8 904 6 903 7 13wy-147B-04 126 295 0.43 0.069 00 0.000 20 1.432 85 0.013 24 0.150 33 0.001 34 898 6 903 6 903 7 13wy-147B-05 155 277 0.56 0.068 93 0.000 24 1.424 66 0.012 93 0.149 68 0.001 27 898 3 899 5 899 7 13wy-147B-06 189 253 0.75 0.068 64 0.000 28 1.410 08 0.012 25 0.148 80 0.001 16 887 9 893 5 894 7 13wy-147B-08 176 264 0.67 0.068 77 0.000 21 1.411 82 0.014 46 0.148 72 0.001 48 900 6 894 6 894 8 13wy-147B-09 186 259 0.72 0.068 79 0.000 26 1.417 62 0.013 94 0.149 16 0.001 32 892 9 896 6 896 7 13wy-147B-10 194 249 0.78 0.068 83 0.000 30 1.423 23 0.014 87 0.149 68 0.001 41 894 8 899 6 899 8 13wy-147B-11 143 280 0.51 0.068 74 0.000 31 1.414 90 0.014 51 0.149 12 0.001 44 900 10 895 6 896 8 13wy-147B-12 189 253 0.75 0.068 37 0.000 21 1.421 34 0.011 02 0.150 50 0.001 11 880 7 898 5 904 6 13wy-147B-13 172 264 0.65 0.068 29 0.000 26 1.399 51 0.010 45 0.148 37 0.001 02 877 4 889 4 892 6 13wy-147B-14 168 266 0.63 0.068 68 0.000 35 1.405 31 0.014 44 0.148 17 0.001 40 900 10 891 6 891 8 13wy-147B-15 220 231 0.95 0.068 49 0.000 33 1.428 76 0.010 14 0.150 96 0.000 84 883 10 901 4 906 5 13wy-147B-16 170 262 0.65 0.067 45 0.000 33 1.400 89 0.009 87 0.150 31 0.000 86 852 9 889 4 903 5 13wy-147B-17 189 251 0.75 0.067 95 0.000 28 1.411 09 0.010 53 0.150 27 0.001 01 878 9 894 4 902 6 13wy-147B-18 159 268 0.59 0.067 72 0.000 37 1.402 92 0.010 52 0.149 92 0.000 90 861 11 890 4 901 5 13wy-147B-19 153 274 0.56 0.067 36 0.000 36 1.387 22 0.011 40 0.148 98 0.001 01 850 11 884 5 895 6 13wy-147B-20 193 248 0.78 0.067 38 0.000 31 1.388 81 0.009 68 0.149 14 0.000 94 850 9 884 4 896 5 13wy-147B-21 118 295 0.40 0.067 50 0.000 31 1.399 18 0.011 59 0.149 93 0.001 13 854 11 889 5 901 6 13wy-147B-22 126 293 0.43 0.067 24 0.000 32 1.374 70 0.011 63 0.147 93 0.001 16 856 10 878 5 889 7 13wy-147B-23 136 284 0.48 0.067 25 0.000 36 1.380 57 0.010 14 0.148 59 0.000 96 856 11 881 4 893 5 13wy-147B-24 175 259 0.67 0.066 87 0.000 44 1.369 95 0.011 95 0.148 16 0.000 97 835 18 876 5 891 5 注：采样点GPS坐标为29°51.4966′N 120°34.3332′E，地点为浙江绍兴平水镇桃红村红兵线与船外线交界处. 
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表 2 桃红闪长岩样品主量元素(%) 和微量元素(10-6) 分析结果
Table 2. Major elements (%) and trace elements (10-6) results for the Taohong diorite samples
样品 13WY-147A 13WY-147B 13WY-147C 13WY-147D 13WY-147E 13WY-147F Ye et al.(2007) SiO2 56.82 57.17 56.80 62.18 57.43 56.88 56.72~66.57 TiO2 0.57 0.60 0.59 0.53 0.56 0.60 0.62~0.64 Al2O3 16.94 16.81 16.94 15.46 16.33 16.77 14.46~16.99 Fe2O3t 8.25 7.93 7.95 6.48 7.78 8.04 4.52~8.24 MgO 3.62 3.56 3.59 2.68 3.57 3.69 1.82~3.68 MnO 0.16 0.15 0.15 0.13 0.15 0.15 0.07~0.19 CaO 7.43 7.18 7.46 5.78 7.86 7.32 4.10~8.47 K2O 0.59 0.51 0.61 1.50 0.81 0.71 0.60~2.69 Na2O 2.59 3.04 2.86 2.99 2.55 2.61 2.84~3.49 P2O5 0.18 0.18 0.19 0.16 0.16 0.18 0.09~0.19 LOI 2.71 2.64 2.62 1.87 2.56 2.82 1.76~3.23 Total 99.88 99.76 99.76 99.76 99.76 99.78 99.65~100.51 A/CNK 0.92 0.90 0.90 0.91 0.84 0.91 0.78~1.02 Mg# 51 51 51 49 52 52 44~51 K2O/Na2O 4.36 5.92 4.65 2.00 3.14 3.70 V 243 227 173 253 244 198 79.3~184 Cr 33.5 28.1 28.2 25.3 35.1 32.1 Co 20.9 23.1 23.1 16.7 21.8 23.0 Ni 13.2 14.6 15.4 10.7 16.4 17.4 Zn 99.6 82.3 92.7 79.3 88.8 88.4 Ga 16.4 17.2 17.3 15.8 16.7 17.7 12.1~16.2 Rb 10.1 11.5 13.2 34.1 16.8 15.7 13.9~38.9 Sr 502 580 600 518 614 607 369~541 Y 15.20 15.70 13.90 18.70 15.90 15.70 12.50~19.90 Zr 52.60 50.00 62.20 80.30 59.20 44.20 28.00~99.10 Nb 1.90 1.89 1.85 2.40 1.90 1.81 1.87~3.23 Cs 0.62 0.31 0.27 0.75 0.22 0.38 Ba 285 253 312 466 360 366 262~635 La 11.80 11.40 12.10 16.10 12.50 12.00 9.84~20.70 Ce 22.9 27.2 28.0 37.0 29.4 28.1 20.6~42.6 Pr 3.50 3.35 3.33 4.36 3.54 3.39 2.58~5.63 Nd 14.7 14.8 14.3 18.8 15.3 14.9 11.2~24.0 Sm 3.04 3.59 3.12 4.16 3.58 3.37 2.06~5.10 Eu 0.99 1.01 0.96 1.02 1.00 1.02 0.71~1.14 Gd 2.90 3.01 2.81 3.46 2.77 3.07 1.73~4.77 Tb 0.42 0.48 0.42 0.52 0.45 0.45 0.25~0.66 Dy 2.43 2.74 2.47 3.07 2.57 2.64 1.45~3.91 Ho 0.51 0.57 0.49 0.63 0.55 0.55 0.31~0.82 Er 1.44 1.58 1.45 1.83 1.63 1.60 0.88~2.30 Tm 0.22 0.24 0.19 0.27 0.25 0.22 0.12~0.35 Yb 1.41 1.65 1.34 1.89 1.55 1.56 0.88~2.31 Lu 0.23 0.22 0.20 0.26 0.21 0.20 0.15~0.35 Hf 1.49 1.31 1.41 2.04 1.62 1.25 0.63~2.62 Ta 0.33 0.16 0.14 0.22 0.15 0.15 0.11~0.21 Pb 2.93 2.01 2.23 3.28 2.50 2.24 Th 1.23 0.92 1.05 2.94 1.38 1.03 0.45~7.10 U 0.37 0.31 0.33 1.06 0.39 0.34 0.16~3.79 δEu 1.01 0.94 0.99 0.82 0.97 0.97 0.71~1.15 (La/Yb)N 5.64 4.65 6.09 5.76 5.43 5.18 4.68~7.58 Sr/Y 33 37 43 28 39 39 19~48
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表 3 桃红闪长岩样品Sr-Nd同位素分析结果
Table 3. Sr-Nd isotopic results for Taohong diorite samples
样品 13WY-147A 13WY-147C 13WY-147F Li et al.(2009) 87Rb/86Sr 0.058 19 0.063 63 0.074 81 - 87Sr/86Sr 0.703 817 0.703 898 0.704 049 - 1σ 7 6 7 - (87Sr/86Sr)i 0.703 060 0.703 070 0.703 076 - 147Sm/144Nd 0.125 022 0.132 072 0.136 573 0.116~0.135 143Nd/144Nd 0.512 547 0.512 598 0.512 623 0.512 552~0.512 635 1σ 6 5 5 (143Nd/144Nd)i 0.511 801 0.511 810 0.511 808 0.511 821~0.511 912 tDM(Ga) 1.04 1.03 1.04 0.86~1.02 εNd(t) +6.58 +6.76 +6.72 +6.74~+8.50
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