Geochronology, Geochemistry and Geological Significance of Gabbros from Yongding Daping Area, Southwest Fujian
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摘要: 南岭地区湘南-赣南-粤北-闽西南近东西向的岩浆岩活动带在年龄、成因、动力学背景等方面一直存有争议.以福建西南部永定地区的大坪辉长岩脉为研究对象,在详细的野外工作及镜下岩相学观察的基础上,对其开展了斜锆石U-Pb同位素定年、全岩主微量元素含量以及Sr-Nd同位素比值的测试工作.获得同位素年龄为184.0±6.5 Ma,表明岩浆活动为早侏罗世.其地球化学特征具有高碱高钾的特点,无Nb,Ta的正异常,(87Sr/86Sr)i初始值变化在0.708 0~0.709 0之间,εNd(t)值在-3.6~-3.0之间,显示辉长岩脉起源于富集岩石圈地幔的部分熔融,未经历过壳源物质的AFC作用.该地区同时发育有双峰式火山岩及A型花岗岩,表明在早侏罗世包括永定在内的该岩浆带处于拉张的动力学背景,软流圈上涌,加热EMII型富集岩石圈地幔,分别形成了藩坑组玄武岩和永定大坪辉长岩脉.Abstract: The age,petrogenesis and geodynamic background of the igneous rock belt across southern Hunan,southern Jiangxi,northern Guangdong and southwestern Fujian,have been controversial in last decades. In this paper,new gabbro samples from Daping of Yongding area in southwestern Fujian are studied to discuss related problems. Based on field work and microscopic petrographical observation,baddeleyite U-Pb isotope age,whole rock major and trace elements content,and Sr-Nd isotoperatios are acquired. The obtained isotopic dating result is 184.0±6.5 Ma,which indicates that the time of magmatism is in early Jurassic. Whole rock data show that these gabbros are high K2O and high K2O+Na2O,no Nb and Ta positive anomalies,(87Sr/86Sr)i value are between 0.708 0 and 0.709 0,εNd(t) value are from -3.6 to -3.0. Geochemistry data prove that gabbro originated from partial melting of enriched lithospheric mantle and had not experienced AFC process. At the same time,there are bimodal volcanic rocks and A-type granites formed in same area,indicating a extension dynamic background in Early Jurassic,enriched lithospheric mantle has EMII characteristics and been heated by the upwelling of as the nosphere mantle,their melts formed Yongding Daping gabbros and Fangkeng Formations basalt respectively.
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Key words:
- Southwestern Fujian /
- Yongding Daping /
- gabbro /
- petrogeochemistry
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图 1 (a) 华南侏罗世玄武岩、辉长岩和花岗岩分布;(b)福建永定地区地质钻孔简图
图a据Gan et al.(2017)修改;岩体年龄数据统计据:赵振华等(1998);周金城和陈荣(2001);Li et al.(2003, 2004);Wang et al.(2003, 2005, 2008); He et al.(2010);冀春雨和巫建华(2010);Zhu et al.(2010);项媛馨和巫建华(2012);许华等(2014); Jiang et al.(2015);Cen et al.(2016)
Fig. 1. The distribution of 200~145 Ma basalts、gabbros and granites in South China (a) and simplified geological map of the Yongding area, Fujian Province (b)
图 4 永定大坪辉长岩及藩坑组玄武岩岩石分类图解
a.据Middlemost(1994);玄武岩据周金城等(2005);许中杰等(2019)
Fig. 4. Rock classification diagram for Fangkeng Formation basalt and Yongding Daping gabbros
图 5 永定大坪辉长岩及藩坑组玄武岩微量元素及稀土元素蛛网图
藩坑组玄武岩据周金城等(2005);许中杰等(2019);中国东部OIB玄武岩据Zhang et al.(2009); Wang et al.(2011);徐峥(2012)
Fig. 5. Chondrite-normalized REE pattern diagram(a) and primitive mantle normalized trace element diagram(b) in Fangkeng Formation basalt and Yongding Daping gabbros
图 6 永定大坪辉长岩脉及藩坑组玄武岩壳源物质混染判别图解
藩坑组玄武岩据周金城等(2005);许中杰等(2019)
Fig. 6. Crustal source substance mixed discrimination diagrams for Fangkeng Formation basalt and Yongding Daping gabbros
图 7 永定大坪辉长岩脉及藩坑组玄武岩相容元素与不相容元素图解
藩坑组玄武岩据周金城等(2005);许中杰等(2019)
Fig. 7. Compatible elements vs. incompatible elements diagrams for Fangkeng Formation basalt and Yongding Daping gabbros
图 8 永定大坪辉长岩脉及藩坑组玄武岩Nb/U-Nb和Ce/Pb-Ce图解
底图据Hofmann et al.(1986);藩坑组玄武岩据周金城等(2005);许中杰等(2019)
Fig. 8. Nb/U-Nb(a) and Ce/Pb-Ce(b) diagram for Fangkeng Formation basalt and Yongding Daping gabbros
图 9 永定大坪辉长岩脉及藩坑组玄武岩Lu/Yb-Nb/La图解
底图据Zhou et al. (2009);藩坑组玄武岩据周金城等(2005);许中杰等(2019)
Fig. 9. Lu/Yb-Nb/La diagram for Fangkeng Formation basalt and Yongding Daping gabbros
图 10 永定大坪辉长岩脉及藩坑组玄武岩Sr-Nd同位素图解
源区储库据Zindler and Hart(1986);Jahn et al.(1999);藩坑组玄武岩据周金城等(2005);许中杰等(2019);中国东部OIB玄武岩据Zhang et al.(2009); Wang et al.(2011);徐峥(2012)
Fig. 10. Sr-Nd diagram for Fangkeng Formation basalt and Yongding Daping gabbros
表 1 永定大坪辉长岩脉斜锆石U-Pb同位素定年数据表
Table 1. LA-ICP-MS baddeleyite U-Pb dating results for the Yongding Daping gabbros
编号 同位素比值 年龄(Ma) 207Pb/235
U2SE 206Pb/238
U2SE 207Pb/206
Pb2SE 208Pb/232
U2SE 207Pb/235
U2SE 206Pb/238
U2SE 208Pb/232
U2SE 207Pb/206
Pb2SE 1 0.259 0.074 0.029 8 0.003 0 0.061 0 0.015 0 0.025 0 0.011 0 216 47 189 19 480 200 160 350 2 0.187 0.033 0.029 9 0.001 5 0.046 9 0.007 6 0.023 0 0.016 0 171 28 190 10 450 300 -20 300 3 0.350 0.140 0.029 7 0.002 9 0.089 0 0.041 0 0.001 0 0.035 0 340 130 188 18 120 750 730 740 4 0.186 0.042 0.029 2 0.001 6 0.049 0 0.011 0 0.019 0 0.022 0 170 35 186 10 350 420 140 450 5 0.360 0.130 0.030 0 0.003 6 0.092 0 0.036 0 0.150 0 0.140 0 280 89 190 22 2 000 1 700 610 710 6 0.438 0.097 0.031 7 0.003 8 0.094 0 0.015 0 0.082 0 0.031 0 350 58 201 24 1 520 540 1 460 380 7 0.286 0.092 0.028 6 0.001 4 0.075 0 0.023 0 0.014 9 0.009 8 239 59 182 9 290 190 630 480 8 0.168 0.020 0.028 6 0.001 4 0.044 2 0.005 7 0.022 0 0.025 0 157 18 182 9 420 450 -90 240 9 0.590 0.170 0.029 7 0.002 7 0.142 0 0.040 0 0.101 0 0.035 0 430 100 188 17 1 870 630 1 780 580 10 0.370 0.240 0.027 4 0.003 1 0.110 0 0.075 0 0.083 0 0.073 0 270 140 174 19 1 400 1 300 1 100 1 200 11 0.307 0.068 0.031 4 0.003 6 0.076 0 0.018 0 0.670 0 0.670 0 276 57 199 22 4 400 2 800 790 500 12 0.174 0.034 0.027 8 0.004 8 0.048 0 0.012 0 0.012 0 0.017 0 161 29 176 30 230 320 150 550 13 0.320 0.190 0.028 8 0.001 8 0.082 0 0.046 0 0.017 0 0.015 0 242 98 183 11 320 280 380 500 14 0.370 0.180 0.028 0 0.001 2 0.124 0 0.072 0 0.006 3 0.003 5 360 150 178 8 126 71 960 670 表 2 永定大坪辉长岩脉主量元素和微量元素含量数据
Table 2. Major (%) and trace (10-6) element compositions of the Yongding Daping gabbros
样品 辉长岩 辉长岩 辉长岩 辉长岩 SiO2 46.27 46.96 46.97 46.48 TiO2 3.84 3.42 3.45 3.43 Al2O3 14.51 14.62 14.61 14.31 TFe2O3 14.31 13.94 13.91 14.81 MnO 0.21 0.18 0.18 0.19 MgO 4.41 4.58 4.61 4.70 CaO 8.19 7.90 7.97 7.70 Na2O 2.95 2.85 2.86 2.73 K2O 2.20 2.49 2.49 2.41 P2O5 0.96 0.91 0.93 0.84 LOI 1.85 1.77 1.83 1.65 Total 100.00 100.00 100.00 100.00 Li 29.96 29.25 29.90 23.20 Be 1.38 1.22 1.26 1.29 Sc 31.73 28.22 28.84 18.30 V 319.7 298.2 304.6 270.0 Cr 11.99 11.67 11.57 17.90 Mn 1 625 1 378 1 378 1 490 Co 38.44 39.25 40.82 40.50 Ni 23.78 22.65 23.34 26.20 Cu 31.31 26.44 26.51 51.90 Zn 152.1 142.4 143.6 159.0 Ga 22.31 22.31 23.51 22.10 Rb 56.59 77.14 80.71 83.00 Sr 551.5 560.0 575.0 587.0 Y 32.52 31.31 32.12 25.60 Zr 224.4 223.1 227.0 215.0 Nb 17.96 16.86 17.23 19.50 Sn 2.45 1.20 1.29 1.49 Cs 3.40 8.52 8.73 5.78 Ba 1 091 1 122 1 152 1 215 La 34.01 34.06 34.77 36.60 Ce 74.64 74.82 76.60 73.70 Pr 9.70 9.42 9.67 10.30 Nd 41.36 39.94 41.35 41.20 Sm 8.96 8.68 8.84 8.61 Eu 3.76 3.65 3.74 3.75 Gd 8.53 7.84 8.31 8.07 Tb 1.12 1.10 1.13 1.16 Dy 6.09 5.97 6.34 5.62 Ho 1.15 1.07 1.18 1.12 Er 3.08 2.92 3.05 2.89 Tm 0.37 0.35 0.37 0.43 Yb 2.36 2.34 2.57 2.47 Lu 0.38 0.37 0.35 0.42 Hf 5.31 5.32 5.46 4.89 Ta 0.99 0.94 0.93 2.90 Pb 7.41 7.74 8.42 8.06 Th 2.21 2.44 2.51 3.16 U 0.40 0.42 0.46 0.73 表 3 永定大坪辉长岩脉Sr-Nd同位素数据
Table 3. Sr-Nd dating results for the Yongding Daping gabbros
样品 辉长岩 辉长岩 辉长岩 年龄(Ma) 184 184 184 Sm(10-6) 8.96 8.68 8.61 Nd(10-6) 41.36 39.94 41.20 147Sm/144Nd 0.130 937 0.131 246 0.126 267 143Nd/144Nd 0.512 374 0.512 404 0.512 378 2σ 4 5 6 Sm/Nd 0.22 0.22 0.21 INd 0.512 216 0.512 246 0.512 226 εNd(0) -5.1 -4.6 -5.1 εNd(t) -3.6 -3.0 -3.4 2σ 0.08 0.10 0.12 TDM(Ma) 1 431 1 381 1 347 TDMC(Ma) 1 262 1 215 1 247 Rb(10-6) 56.59 77.14 83.00 Sr(10-6) 551.45 559.91 587.00 87Rb/86Sr 0.296 955 0.398 679 0.409 145 87Sr/86Sr 0.708 808 0.709 042 0.710 062 2σ 6 6 4 ISr 0.708 0 0.708 0 0.709 0 -
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