Geochemistry, Petrogenesis and Geological Significance of Early Jurassic Granite in Mozhugongka Area, Tibet
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摘要: 为了研究南冈底斯晚三叠世-早侏罗世时期岩浆岩的成因类型和构造背景，针对墨竹工卡地区的松多黑云母二长花岗岩体进行岩相学、年代学、全岩地球化学研究.LA-ICP-MS锆石U-Pb定年结果显示，松多黑云母二长花岗岩结晶年龄为190.2±2.9 Ma，形成于早侏罗世.在地球化学组成上，黑云母二长花岗岩具有低TiO2（0.68%~0.75%），富SiO2（65.22%~66.13%）、Al2O3（16.26%~16.73%）、Na2O（4.05%~4.29%）、K2O（3.96%~4.24%）的特点，显示钾玄岩系列和弱过铝质（A/CNK=1.04~1.11）的主量元素地球化学特征；在微量元素蛛网图上，具有富集Rb、Th、K、Zr、Hf元素和亏损Ba、Nb、Ta、Sr、Ti、P元素的特征；锆石饱和温度介于805~835℃，FeOT/MgO比值高，样品显示出具有部分A型花岗岩特征.结合前人研究表明，晚三叠世-早侏罗世时期南冈底斯岩浆岩构造背景与新特提斯洋北向俯冲有关，松多黑云母二长花岗岩形成于新特提斯洋板片北向俯冲引起的弧后伸展环境；其成因与软流圈上涌导致幔源岩浆底侵引起下地壳的部分熔融有关.Abstract: In order to explore the petrogenesis types and tectonic setting of the Late Triassic-Early Jurassic magmatic rocks in the southern Gangdese, we report detailed petrography, geochronology, and whole-rock geochemistry of the Songduo biotite monzogranite plutons in the Mozhugongka area.The zircon LA-ICP-MS U-Pb dating results show that the age of the Songduo biotite monzogranite plutons is 190.2±2.9 Ma, indicating that it was formed in the Early Jurassic.In terms of geochemical composition, the Songduo biotite monzogranite plutons have low TiO2 (0.68%-0.75%), high SiO2 (65.22%-66.13%), Al2O3 (16.26%-16.73%), Na2O (4.05%-4.29%), and K2O (3.96%-4.24%) contents, belonging to the shoshonite series and weakly-peraluminous (A/CNK=1.04-1.11);In the spidergram, the samples show enrichment in Rb, Th, K, Zr and Hf, and depletion in Ba, Nb, Ta, Sr, Ti and P. The whole-rock zircon saturation temperature varies from 805 to 835 ℃, with high FeOT/MgO ratios. The Songduo pluton has an affinity with A-type granite. In combination with pervious research results, it shows that the Late Triassic-Early Jurassic magmatic rocks in central and southern Gangdese were formed in magmatic arc related to the northward subduction of the Neo-Tethys oceanic slab. We suggest that the Songduo biotite monzogranite plutons generated in a back-arc extensional environment during the subduction of the Neo-Tethys oceanic slab, and the formation of granite is related to the partial melting of the lower crust caused by the intrusion of mantle-derived magma.
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Key words:
- Gangdese /
- zircon U-Pb dating /
- geochemistry /
- A-type granites /
- Neo-Tethys Ocean
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图 1 冈底斯构造划分(a)和冈底斯岩浆岩分布(b)
a.据Zhu et al.(2011)修改; b.据Wang et al.(2016); 图b中晚三叠世-早侏罗世岩浆岩年龄数据来自Chu et al., 2006; 耿全如等, 2006; 和钟铧等, 2006; 张宏飞等, 2007a; 陈炜等, 2009; Ji et al., 2009b; 唐菊兴等, 2010; Zhu et al., 2011; 董昕和张泽明, 2013; Guo et al., 2013; Kang et al., 2014; Lang et al., 2014; 宋绍玮等, 2014; Meng et al., 2016a, 2016b; 水新芳等, 2016; Wang et al., 2016; Ma et al., 2017; Xu et al., 2017; 卢志友等, 2018; 孟元库等, 2018a, 2018b; 王旭辉等, 2018; 邹洁琼等, 2018
Fig. 1. Tectonic framework of the Gangdese (a) and diagram showing the distribution of magmatic rocks in the Gandese (b)
图 2 松多黑云母二长花岗岩体野外地质简图(a)、野外照片(b~c)和镜下照片(d~e)
Qtz.石英; Pl.斜长石; Kfs.钾长石; Bt.黑云母
Fig. 2. Simplified geological map (a), field photographs (b-c) and photomicrographs (d-e) of the Songduo biotite monzogranite plutons
图 3 松多黑云母二长花岗岩体部分锆石阴极发光(CL)图像
Fig. 3. CL image of zircons from part of the Songduo biotite monzogranite plutons
图 4 松多黑云母二长花岗岩体锆石U-Pb谐和图
Fig. 4. U-Pb concordia diagrams of zircons from the Songduo biotite monzogranite plutons
图 5 松多黑云母二长花岗岩体Na2O+K2O-SiO2(a)、K2O-SiO2(b)、A/NK-A/CNK(c)、Zr+Nb+Ce+Y-(Na2O+K2O)/CaO、Zr+Nb+Ce+Y-FeOT/MgO和10 000Ga/Al-Zr(d, e, f)图解
a.据Middlemost(1994); b.据Richwood(1989); c.据Peccerillo and Taylor(1976); d, e, f.据Whalen et al.(1987)
Fig. 5. Na2O+K2O-SiO2 (a), K2O-SiO2 (b), A/NK-A/CNK(c), Zr+Nb+Ce+Y-(Na2O+K2O)/CaO, Zr+Nb+Ce+Y-FeOT/MgO and 10 000Ga/Al-Zr (d, e, f) diagrams of the Songduo biotite monzogranite plutons
图 6 松多黑云母二长花岗岩体球粒陨石标准化稀土元素配分曲线图(a)和原始地幔标准化微量元素蛛网图(b)
Fig. 6. Chondrite-normalized REE patterns (a) and primitive mantle normalized muti-element diagrams (b) of the Songduo biotite monzogranite plutons
图 7 松多黑云母二长花岗岩体Th/Y-Nb/Y(a)和Zr/Sm-Zr(b)图解
a.据Boztuğ et al.(2007);b.据Schiano et al.(2010)
Fig. 7. Th/Y-Nb/Y (a) and Zr/Sm-Zr (b) diagrams of the Songduo biotite monzogranite plutons
图 8 松多黑云母二长花岗岩体CaO/(MgO+FeOT)-Al2O3/(MgO+FeOT)图解
Fig. 8. CaO/(MgO+FeOT)-Al2O3/(MgO+FeOT) diagrams of the Songduo biotite monzogranite plutons
图 9 松多黑云母二长花岗岩体A1、A2类型判别图
Fig. 9. Diagram for division of A1-and A2-type of the Songduo biotite monzogranite plutons
图 10 松多岩体和曲龙寺岩体Rb/30-Hf-3Ta(a)、Rb-Y+Nb、Nb-Y及Ta-Yb(b, c, d)图解
b, c, d.据Pearce et al.(1984); 曲龙寺花岗岩数据卢志友等(2018)
Fig. 10. Rb/30-Hf-3Ta (a), Rb-Y+Nb, Nb-Y and Ta-Yb (b, c, d) diagrams of the Songduo and Qulongsi plutons
图 11 松多黑云母二长花岗岩体的形成构造演化模式
Fig. 11. Tectonic evolution models showing the petrogensis of the Songduo biotite monzogranite plutons
表 1 松多黑云母二长花岗岩体锆石LA-ICP-MS U-Pb测年结果
Table 1. Zircon LA-ICP-MS U-Pb dating result of the Songduo biotite monzogranite plutons
编号 Total
Pb(10-6)Th(10-6) U(10-6) Th/U 比值 年龄(Ma) 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ D0862-N2(松多黑云母二长花岗岩) D0862-N2-01 30.7 188 222 0.85 0.05 190 0.00 338 0.21 269 0.01 369 0.03 002 0.00 052 280 155 196 11 191 3 D0862-N2-02 27.0 157 225 0.70 0.04 885 0.00 286 0.19 808 0.01 128 0.02 964 0.00 051 139 133 184 10 188 3 D0862-N2-03 22.6 137 136 1.01 0.05 149 0.00 375 0.20 692 0.01 341 0.02 938 0.00 050 261 167 191 11 187 3 D0862-N2-04 26.8 158 216 0.73 0.05 095 0.00 336 0.20 199 0.01 190 0.02 912 0.00 046 239 152 187 10 185 3 D0862-N2-07 37.6 222 342 0.65 0.05 063 0.00 249 0.20 503 0.01 014 0.02 942 0.00 044 233 119 189 9 187 3 D0862-N2-08 23.4 140 163 0.86 0.04 983 0.00 337 0.20 389 0.01 334 0.02 913 0.00 056 187 162 188 11 185 4 D0862-N2-09 42.4 265 253 1.05 0.05 065 0.00 297 0.19 519 0.01 136 0.02 810 0.00 036 233 135 181 10 179 2 D0862-N2-11 24.9 144 231 0.62 0.04 508 0.00 255 0.18 665 0.01 029 0.03 016 0.00 047 error 174 9 192 3 D0862-N2-12 28.1 165 252 0.65 0.05 368 0.00 295 0.21 880 0.01 251 0.02 963 0.00 042 367 124 201 10 188 3 D0862-N2-15 40.0 239 329 0.73 0.04 643 0.00 243 0.19 307 0.00 986 0.03 035 0.00 053 20 122 179 8 193 3 D0862-N2-16 21.1 130 139 0.93 0.04 702 0.00 419 0.20 099 0.01 806 0.03 088 0.00 068 50 200 186 15 196 4 D0862-N2-17 107 633 694 0.91 0.05 196 0.00 182 0.22 018 0.00 794 0.03 053 0.00 032 283 75 202 7 194 2 D0862-N2-18 25.3 150 183 0.82 0.05 228 0.00 333 0.22 496 0.01 360 0.03 171 0.00 059 298 144 206 11 201 4 D0862-N2-19 13.4 84.0 123 0.68 0.05 561 0.00 682 0.21 736 0.02 312 0.02 877 0.00 076 435 250 200 19 183 5 D0862-N2-20 34.0 207 256 0.81 0.05 132 0.00 362 0.21 858 0.01 610 0.03 128 0.00 065 254 163 201 13 199 4 D0862-N2-21 60.0 344 369 0.93 0.05 513 0.00 295 0.23 915 0.01 285 0.03 142 0.00 050 417 116 218 11 199 3 D0862-N2-22 34.6 196 306 0.64 0.05 473 0.00 304 0.23 325 0.01 305 0.03 096 0.00 047 467 124 213 11 197 3 D0862-N2-24 13.7 86.6 113 0.77 0.05 180 0.00 471 0.20 823 0.01 768 0.03 008 0.00 065 276 209 192 15 191 4 D0862-N2-25 36.3 202 323 0.63 0.05 141 0.00 268 0.21 240 0.01 066 0.03 013 0.00 041 261 88 196 9 191 3 D0862-N2-05 19.0 119 183 0.65 0.05 465 0.00 512 0.20 068 0.01 826 0.02 642 0.00 071 398 211 186 15 168 4 D0862-N2-06 28.0 172 131 1.31 0.04 678 0.00 379 0.17 848 0.01 236 0.02 783 0.00 054 39 181 167 11 177 3 D0862-N2-10 14.0 88.0 131 0.67 0.05 865 0.01 081 0.18 549 0.02 212 0.02 521 0.00 072 554 411 173 19 160 5 D0862-N2-13 21.4 143 209 0.68 0.04 606 0.00 564 0.16 497 0.01 684 0.02 692 0.00 061 400 -128 155 15 171 4 D0862-N2-14 278 92.8 1 400 0.07 0.09 203 0.00 154 2.92 169 0.05 712 0.22 863 0.00 272 1 533 32 1 388 15 1 327 14 D0862-N2-23 19.4 112 165 0.67 0.05 577 0.00 532 0.29 027 0.03 141 0.03 825 0.00 216 443 213 259 25 242 13 
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表 2 松多黑云母二长花岗岩体花岗岩全岩主量(%)、微量(10-6)及稀土元素(10-6)分析结果
Table 2. Analytic results of the major (%), trace (10-6) and rare earth elements (10-6) of the Songduo biotite monzogranite plutons
样品编号 D0862-DH1 D0862-DH2 D0862-DH3 D0862-DH4 D0862-DH5 SiO2 65.93 65.34 66.13 65.22 65.69 TiO2 0.75 0.75 0.68 0.71 0.71 Al2O3 16.73 16.37 16.26 16.43 16.33 Fe2O3 0.54 0.61 0.52 0.59 0.55 FeO 3.08 3.46 2.93 3.33 3.10 MnO 0.29 0.30 0.27 0.29 0.28 MgO 1.25 1.19 1.15 1.48 1.26 CaO 2.05 2.30 2.41 2.19 2.31 Na2O 4.29 4.07 4.11 4.12 4.05 K2O 3.96 4.21 4.20 4.24 4.13 P2O5 0.41 0.40 0.48 0.42 0.41 LOI 0.20 0.65 0.79 0.61 0.63 Total 99.11 99.03 99.26 99.04 99.17 K2O/ Na2O 0.92 1.03 1.02 1.03 1.01 FeOT 3.63 4.07 3.45 3.92 3.64 Fe2O3T 4.07 4.59 3.89 4.43 4.11 FeOT/MgO 2.90 3.42 3.00 2.65 2.89 A/CNK 1.11 1.06 1.04 1.07 1.07 A/NK 2.41 2.49 2.45 2.47 2.49 DI(分异指数) 47.85 50.08 53.88 54.49 59.89 Mg# 35.60 31.94 34.86 37.70 35.67 Li 113.75 103.04 93.52 106.34 102.82 Be 1.83 1.66 1.72 1.69 1.75 Sc 15.77 14.34 15.07 14.62 15.34 Ti 4 742.13 4 565.57 4 195.07 4 384.72 4 514.83 V 49.87 55.62 51.40 52.06 53.87 Cr 16.12 15.88 29.97 18.45 17.96 Mn 2 724.57 2 800.36 2 737.29 2 748.09 2 784.35 Co 8.65 8.60 8.24 8.43 8.62 Ni 3.32 2.97 7.64 3.36 3.54 Cu 9.44 8.38 9.35 9.14 9.23 Zn 65.78 67.48 59.72 63.71 64.88 Ga 20.19 20.28 19.75 20.08 20.24 Rb 177.09 225.74 249.63 214.83 221.63 Sr 139.57 143.51 158.10 146.34 149.31 Y 68.44 83.51 89.82 81.47 80.96 Zr 265.35 315.94 399.89 354.26 331.36 Nb 25.53 23.77 23.07 23.02 24.13 Mo 0.49 0.38 0.58 0.43 0.46 Sn 4.34 4.39 3.99 4.21 4.31 Cs 9.79 11.73 12.49 11.52 10.96 Ba 269.09 267.97 268.50 268.24 267.83 La 75.16 83.39 88.51 84.63 86.14 Ce 162.10 182.79 201.21 193.02 186.11 Pr 17.49 19.03 20.59 19.36 18.51 Nd 61.67 67.03 72.39 65.72 64.89 Sm 13.35 14.40 15.79 14.33 15.09 Eu 0.89 0.91 0.96 0.92 0.94 Gd 11.03 12.23 13.36 12.08 13.1 Tb 1.91 2.15 2.36 2.12 2.21 Dy 12.24 14.22 15.39 14.16 13.97 Ho 2.43 2.91 3.10 2.81 2.74 Er 6.44 7.87 8.30 7.16 8.03 Tm 1.00 1.23 1.29 1.21 1.12 Yb 6.26 7.57 8.17 6.93 7.42 Lu 1.00 1.21 1.33 1.16 1.23 Hf 8.28 9.47 11.95 9.83 8.91 Ta 1.37 1.17 1.29 1.26 1.31 W 0.48 0.46 0.58 0.51 0.49 Pb 13.42 13.20 14.63 13.32 13.64 Bi 0.07 0.07 0.09 0.08 0.09 Th 29.63 31.17 38.55 35.99 36.26 U 3.63 4.04 5.29 4.26 4.47 ΣREE 372.96 416.95 452.76 425.61 421.50 LREE 330.66 367.55 399.46 377.98 371.68 HREE 42.30 49.39 53.29 47.63 49.82 LREE/HREE 7.81 7.44 7.49 7.94 7.46 (La/Yb)N 8.62 7.91 7.77 8.76 8.33 δEu 0.22 0.21 0.20 0.21 0.20
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