Petrogeochemistry, Zircon SHRIMP U-Pb Geochronology of Mafic Dykes in South Guizhou and Their Geological Implications
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摘要: 基性岩墙，与层状、环状基性杂岩体和高Ti、低Ti玄武岩共同组成了峨眉山大火成岩省岩石组合.为进一步确定大火成岩省及相关生物灭绝事件的时间联系，及更深化研究大火成岩省的成因，对分布于贵州省南部的基性岩墙进行了主、微量元素、Sr-Nd同位素测定和锆石SHRIMP U-Pb年代学研究.黔南基性岩墙∑REE=135.66×10-6~280.59×10-6，LREE/HREE为6.42~7.54，（La/Yb）N为7.94~9.85，轻重稀土分异明显，δEu为1.0~1.3，具有Ba、Sr、K等LILE富集，Nb、Ta、Zr、Hf等HFSE亏损特征，显示与峨眉山高钛玄武岩相似的地球化学特征.Th/Ta（1.80~1.94）、Nb/U（30.8~39.88）、Th/La（0.08~0.10）、Nb/Th（7.89~8.40）比值与原始地幔相似，较低的初始（87Sr/86Sr）i比值（0.705 278~0.706 052）、εNd（t）（-0.5~+1.6）、以及Th/Ta比值（< 2.13）显示岩浆无明显的地壳混染，岩浆可能形成于受地幔柱作用的富集石榴石地幔源区10%~12%的部分熔融.SHRIMP锆石206Pb/238U加权平均年龄为261.2±2.6 Ma，反映峨眉山大火成岩的喷发时间可能集中在260 Ma左右，并可能与瓜德鲁普末期的生物灭绝有关.Abstract: The rocks of Emeishan large igneous province (ELIP) are mainly composed of mafic dykes, layered and ring mafic complex, high Ti and low Ti basalts. The major elements, trace elements, Sr-Nd isotopes and zircon SHRIMP U-Pb ages of mafic dykes from South Guizhou Province were studied in order to further determine the temporal link between ELIP and related mass extinction events and research the genesis of ELIP in this paper. Results show ∑REE=135.66×10-6-280.59×10-6, LREE/HREE=6.42-7.54, (La/Yb)N=7.94-9.85, relatively enriched LREE to HREE, δEu=1.0-1.3, enriched LILE, such as Ba, K, Sr, depleted HFSE, such as Nb, Ta, Zr, Hf, displaying similar geochemical characteristics of Emeishan high Ti basalts. The similar ratios of Th/Ta(1.80-1.94), Nb/U(30.8-39.88), Th/La(0.08-0.10), Nb/Th(7.89-8.40) to primitive mantle, low (87Sr/86Sr)i(0.705 278-0.706 052)), εNd(t)(-0.5~+1.6) and Th/Ta(< 2.13) imply no obvious crustal contamination, and the mafic rocks may have been caused by 10%-12% partial melting of the garnet peridotite in their source region that interacted with the upwelling Emeishan plume at the periphery of the plume. The 261.2±2.6 Ma age of zircon SHRIMP U-Pb may imply that the ELIP formed by a mantle plume at~260 Ma and was one of the likely causes of the end-Guadalupian mass extinction.
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Key words:
- mafic dyke /
- petrology /
- geochemistry /
- zircon SHRIMP U-Pb age /
- Emeishan large igneous province /
- South Guizhou
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图 1 黔南基性岩墙地质图
a.研究区大地构造位置图, 据程裕淇(1994)；b.黔南基性岩墙地质略图，据1：20万罗甸幅(贵州省地质局108队，1965；1：20万罗甸幅)、乐业幅地质图(广西壮族自治区地质局，1972；1：20万乐业幅地质图)修改.T2b2.中三叠统边阳组中段；T1.下三叠统；P2m.中二叠统茅口组；P2q.中二叠统栖霞组；C2mp.上石炭统马平组；C2hn.上石炭统黄龙组；C1d-b.下石炭统大塘组-摆佐组；D3s-d.上泥盆统响水洞组-代化组；D2h.中泥盆统火烘组；βμ.基性岩墙
Fig. 1. Geological background of the mafic dyke, South Guizhou
图 3 基性岩墙野外露头(a)、手标本(b)以及正交偏光镜下特征(c)
Pl.斜长石；Cpx.单斜辉石；Mt.磁铁矿
Fig. 3. Photos of the outcrops (a), hand specimen (b) and microscope of the mafic dyke in cross-polarized light (c)
图 4 黔南基性岩墙SiO2-K2O+Na2O图解(a)和Nb/Y-Zr/TiO2×0.000 1图解(b)
图a据Bas et al.(1986)；图b据Winchester and Floyd(1977)
Fig. 4. SiO2 vs. K2O+Na2O (a), and Nb/Y-Zr/TiO2×0.000 1 (b) for the mafic dyke from South Guizhou
图 6 黔南基性岩墙稀土元素球粒陨石标准化图解(a)和微量元素原始地幔蛛网图(b)
图a据Taylor and McLennan(1985)；图b据Sun and McDonough(1989).峨眉山高钛玄武岩数据来自Xu et al.(2001); Xiao et al.(2003); Zhou et al.(2006)
Fig. 6. Chondrite-normalized REE patterns (a) and primitive mantle-normalized trace element patterns (b) for the mafic dyke from South Guizhou
图 7 黔南基性岩墙Sr-Nd同位素初始比值
峨眉山玄武岩数据来自Xu et al.(2001); Song et al.(2004, 2008); Xiao et al.(2004); Wang et al.(2007); Fan et al.(2008); Qi and Zhou(2008); Shellnutt et al.(2008).DMM, EMI, EMII来自Zindler and Hart(1986); Hart(1988); Weaver(1991)
Fig. 7. Plot of initial εNd(t) vs. (87Sr/86Sr)i for the mafic dyke from South Guizhou
图 8 黔南基性岩墙锆石U-Pb年龄谐和图及CL图像
Fig. 8. Zircon SHRIMP U-Pb convordia diagrams and CL images for the mafic dyke from South Guizhou
图 9 黔南基性岩墙Nb/Yb-Th/Yb(a)和Nb/Yb-TiO2 /Yb(b)图解
Fig. 9. Nb/Yb vs.Th/Yb (a) and Nb/Yb vs. TiO2/Yb (b) diagrams for the mafic dyke from South Guizhou
图 10 黔南基性岩La/Yb-Sm/Yb图解
底图引自王妍(2011)
Fig. 10. La/Yb vs. Sm/Yb diagram for the mafic dyke from South Guizhou
表 1 黔南基性岩墙岩石主量元素(%)、微量和稀土元素(10-6)化学成分分析结果
Table 1. Major (%) and trace and REE element (10-6) abundances for the mafic dyke from South Guizhou
样号 GG14-1 GG14-2 QJ1-1 ec7 ec8 ec10 BS2 BS5 LM1 LM4 SiO2 47.00 46.20 45.50 45.80 47.50 48.50 46.00 45.50 44.40 46.80 TiO2 3.10 3.28 3.29 2.81 3.65 3.63 2.79 2.83 3.25 3.65 Al2O3 12.90 13.05 14.10 14.15 12.45 12.55 15.70 15.60 13.95 12.05 Fe2O3 15.60 15.50 14.92 14.08 16.36 14.33 13.98 14.72 14.76 16.46 MnO 0.23 0.21 0.22 0.19 0.27 0.19 0.16 0.18 0.20 0.27 MgO 5.52 4.32 6.02 5.24 4.05 5.64 4.48 4.70 5.80 4.90 CaO 7.51 9.22 10.00 9.20 6.76 7.35 7.61 8.22 10.80 8.24 Na2O 4.25 3.98 2.63 3.57 4.08 4.70 3.72 3.68 2.93 3.07 K2O 0.75 1.06 1.18 0.59 1.34 0.45 0.94 0.99 0.64 1.10 P2O5 0.76 0.84 0.71 0.71 1.08 0.93 0.54 0.57 0.73 0.95 LOI 2.42 1.91 1.74 2.88 1.59 1.55 3.42 2.86 2.48 2.00 Total 100.04 99.57 100.31 99.22 99.13 99.82 99.34 99.85 99.94 99.49 Rb 13.40 18.00 21.40 9.70 22.70 8.30 22.90 23.90 7.30 22.50 Sr 454 916 606 602 332 437 596 663 694 708 Ba 340 440 640 270 570 360 490 490 1860 600 Th 2.50 3.20 2.80 2.70 3.90 3.40 1.80 1.90 2.60 3.50 U 0.60 0.70 0.70 0.60 0.80 0.80 0.40 0.50 0.60 0.80 Nb 21.00 25.90 22.10 21.60 31.90 27.20 15.10 15.40 21.70 29.40 Ta 1.36 1.68 1.46 1.44 2.17 1.81 0.97 0.98 1.43 1.89 Pb 2.10 7.10 2.60 1.30 3.00 2.00 2.00 1.90 1.60 4.40 Zr 106.50 129.00 150.00 98.10 130.50 146.50 77.60 83.00 125.00 152.50 Hf 3.20 3.80 3.90 2.90 3.90 4.10 2.30 2.40 3.70 4.20 Ti 18 585 19 664 19 724 16 846 21 882 21 762 16 726 16 966 19 484 21 882 Ni 39.30 25.10 81.60 35.50 7.50 20.80 59.80 66.50 83.90 6.30 V 311 367 345 310 297 343 362 404 344 335 La 30.50 35.50 27.60 30.70 49.70 37.80 22.90 23.10 29.40 43.10 Ce 69.00 80.10 62.70 68.50 110.00 88.40 51.20 52.60 67.00 97.90 Pr 8.80 10.10 8.25 8.88 14.05 11.40 6.66 6.77 8.41 12.30 Nd 37.80 42.80 33.60 36.90 58.00 47.50 27.80 28.70 35.30 51.20 Sm 8.01 8.84 7.08 7.89 11.70 10.30 6.37 6.24 7.54 10.85 Eu 3.11 3.66 3.13 2.93 4.17 3.30 2.45 2.42 3.11 3.92 Gd 7.87 8.72 6.93 7.60 11.45 9.95 6.21 6.06 7.12 10.50 Tb 1.11 1.23 0.89 1.09 1.60 1.34 0.91 0.85 0.93 1.46 Dy 6.12 7.03 5.23 6.12 8.97 7.48 4.87 4.98 5.44 8.42 Ho 1.19 1.34 1.02 1.20 1.69 1.48 0.95 0.98 1.02 1.62 Er 3.32 3.79 2.50 3.32 4.46 4.01 2.56 2.34 2.60 4.23 Tm 0.42 0.45 0.34 0.44 0.61 0.49 0.36 0.33 0.35 0.51 Yb 2.50 3.08 2.15 2.52 3.62 3.24 2.07 1.93 2.20 3.43 Lu 0.40 0.47 0.32 0.40 0.57 0.50 0.35 0.31 0.33 0.49 Y 30.50 35.10 26.70 31.10 42.90 38.70 23.90 23.50 26.60 40.20 δEu 1.20 1.27 1.37 1.16 1.10 1.00 1.19 1.20 1.30 1.12 ∑REE 180.15 207.11 161.74 178.49 280.59 227.19 135.66 137.61 170.75 249.93 LREE/HREE 6.86 6.93 7.35 6.87 7.51 6.97 6.42 6.74 7.54 7.15 (La/Yb)N 8.75 8.27 9.21 8.74 9.85 8.37 7.94 8.59 9.59 9.01 Th/Ta 1.84 1.90 1.92 1.88 1.80 1.88 1.86 1.94 1.82 1.85 Nb/U 35.00 37.00 31.57 36.00 39.88 34.00 37.75 30.80 36.17 36.75 Th/La 0.08 0.09 0.10 0.09 0.08 0.09 0.08 0.08 0.09 0.08 Nb/Th 8.40 8.09 7.89 8.00 8.18 8.00 8.39 8.11 8.35 8.40 La/Nb 1.45 1.37 1.25 1.42 1.56 1.39 1.52 1.50 1.35 1.47 
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表 2 黔南基性岩墙Sr-Nd同位素数据
Table 2. Sr-Nd isotopic data for the mafic dyke from South Guizhou
样品编号 Rb Sr 87Rb/86Sr 87Sr/86Sr ±2σ (87Sr/86Sr)i Sm Nd 147Sm/144Nd 143Nd/144Nd ±2σ εNd(t) GG13 31.7 490 0.187 0.706 582 12 0.706 052 8.21 37.6 0.132 0 0.512 545 10 0.4 GG14-2 18.0 916 0.057 0.706 264 11 0.705 894 8.84 42.8 0.124 9 0.5125 99 6 1.6 GG14-4 16.1 466 0.100 0.706 267 12 0.705 608 8.45 39.5 0.129 3 0.512 587 13 1.3 QJ1-1 21.4 606 0.102 0.705 988 15 0.705 583 7.08 33.6 0.127 4 0.512 509 13 -0.2 QJ1-2 22.1 559 0.114 0.706 008 13 0.705583 6.84 33.2 0.124 6 0.512 491 12 -0.5 QJ1-3 23.0 536 0.124 0.706 045 11 0.705 881 7.00 33.9 0.124 8 0.512 500 10 -0.3 ec11 20.7 561 0.107 0.706 280 13 0.705 278 9.48 42.8 0.133 9 0.512 602 9 1.4 BS5 23.9 663 0.104 0.705 665 13 0.705 405 6.24 28.7 0.131 4 0.512 559 9 0.6 LM4 22.5 708 0.092 0.705 748 15 0.705 888 10.85 51.2 0.128 1 0.512 546 15 0.5 LMZK2 27.5 620 0.128 0.706 365 14 0.706 052 7.47 34.7 0.130 1 0.512 510 11 -0.3
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表 3 黔南基性岩墙SHRIMP锆石U-Pb同位素测定结果
Table 3. SHRIMP U-Pb isotopic compositions of zircons for the mafic dyke from South Guizhou
测点 206Pc
(%)含量及比值 同位素比值 同位素年龄(Ma) U
(10-6)Th
(10-6)206Pb*
(10-6)232Th/
238U207Pb*/
206Pb*测值
(±%)207Pb*/
235U测值
(±%)206Pb*/
238U测值
(±%)误差相关系数 206Pb/
238U测值±1σ207Pb/
206Pb测值±1σ不谐和度
(%)1.1 0.26 624 587 22.1 0.97 0.050 9 2.0 0.289 0 2.20 0.041 2 1.00 0.451 260.1 ±2.6 236 ±46 -10 2.1 0.32 148 1 512 2 52.7 3.57 0.050 7 1.8 0.289 2 2.00 0.041 3 0.93 0.455 261.1 ±2.4 229 ±42 -14 3.1 0.21 203 7 660 2 73.8 3.35 0.051 2 1.3 0.297 3 1.60 0.042 1 0.93 0.579 265.8 ±2.4 251 ±30 -6 4.1 0.19 619 748 22.2 1.25 0.051 3 1.9 0.295 0 2.10 0.041 7 0.99 0.465 263.4 ±2.6 254 ±44 -4 5.1 0.14 215 5 360 0 77.4 1.73 0.051 3 1.6 0.295 3 1.80 0.041 7 0.92 0.506 263.5 ±2.4 256 ±36 -3 6.1 0.08 307 7 328 3 112.0 1.10 0.051 4 0.8 0.299 3 1.20 0.042 2 0.90 0.753 266.7 ±2.4 259 ±18 -3 7.1 0.20 773 168 5 27.3 2.25 0.051 7 1.7 0.292 4 2.00 0.041 1 0.97 0.494 259.4 ±2.5 270 ±39 4 8.1 0.14 497 469 17.5 0.98 0.052 4 2.5 0.295 0 2.70 0.040 9 1.00 0.379 258.2 ±2.6 301 ±57 14 9.1 0.13 118 3 460 3 42.0 4.02 0.051 6 1.4 0.293 5 1.70 0.041 3 0.93 0.553 260.8 ±2.4 266 ±32 2 10.1 0.94 863 195 1 30.7 2.34 0.050 1 3.4 0.284 0 3.50 0.041 1 0.97 0.275 259.4 ±2.5 202 ±79 -29
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表 4 与峨眉山大火成岩省有关的年龄统计
Table 4. Summary of reported age data from the ELIP
年龄(Ma) 测年对象 测年方法 采样地点 文献出处 254±5 辉石岩中的金云母 Ar/Ar 云南大理洱海边 Boven et al., 2002 251.2~252.8 玄武岩、粗面岩和正长岩 Ar/Ar 云南和四川 Lo et al., 2002 259±3 辉长岩 SHRIMP 攀西新街侵入岩 Zhou et al., 2002 253.6±0.4 玄武岩 Ar/Ar 广西百色 Fan et al., 2004 255.4±0.4 玄武岩 Ar/Ar 广西田阳 Fan et al., 2004 256.2±0.8 玄武岩 Ar/Ar 广西巴马 Fan et al., 2004 253.7±6.1 玄武岩 SHRIMP 广西百色 Fan et al., 2004 262±3 苏长橄榄辉长岩 SHRIMP 四川盐源 Guo et al., 2004 263±3 淡色辉长岩 SHRIMP 攀枝花侵入岩 Zhou et al., 2005 260±3 辉绿岩 SHRIMP 云南富宁 Zhou et al., 2006 258±3 闪长岩 SHRIMP 云南富宁 Zhou et al., 2006 261.6±4.4 正长岩 SHRIMP 攀西猫猫沟岩体 罗震宇等, 2006 258.9±3.4 玄武岩 Ar/Ar 峨眉山玄武岩省 侯增谦等, 2006 259.3±1.3 矿化辉长岩 TIMS 攀西红格侵入岩 Zhong and Zhu, 2006 260.7±0.8 角闪辉长岩 TIMS 攀西冰谷侵入岩 Zhong and Zhu, 2006 261±4 钠闪石花岗岩 SHRIMP 攀西白马侵入岩附近茨达A型花岗岩 Zhong et al., 2007 251±6 黑云母钾长石花岗岩 SHRIMP 攀西红格侵入岩附近矮郎河I型花岗岩 Zhong et al., 2007 249±32 铜镍硫化物矿石 Re-Os 云南白马寨 Wang et al., 2007 256.85±2.69 辉长岩中黑云母 Ar/Ar 攀枝花岩体 Wang et al., 2007 250.2 ±1.9 苦橄质基性-超基性岩 Ar/Ar 四川丹巴杨柳坪 Wang et al., 2007 257±4 宣威组底部沉积物 SHRIMP 贵州威宁 He et al., 2007 260±5 宣威组底部沉积物 SHRIMP 贵州威宁 He et al., 2007 263±4 玄武岩顶部酸性凝灰岩 SHRIMP 云南洱源 He et al., 2007 260±4 粘土岩 SHRIMP 四川朝天 He et al., 2007 263±3 辉长岩 SHRIMP 攀西力马河侵入岩 Zhou et al., 2008 261±1 闪长岩 SHRIMP 攀西朱布侵入岩 Zhou et al., 2008 262±2 正长岩 SHRIMP 攀西白马侵入岩 Zhou et al., 2008 260.6±3.5 蛇纹石化橄榄岩 SHRIMP 云南金宝山岩体 陶琰等, 2008 260.7±5.6 斜长角闪岩 SHRIMP 云南金宝山岩体 陶琰等, 2008 259.6±5.9 斑状玄武岩 SHRIMP 广西巴马 Fan et al., 2008 259.1±4.0 斑状玄武岩 SHRIMP 广西百色 Fan et al., 2008 261.6±4.4 霞石正长岩 SHRIMP 攀西猫猫沟侵入岩 Xu et al., 2008 259.8±3.5 辉石正长岩 SHRIMP 攀西米易 Xu et al., 2008 260.4±3.6 闪长岩 SHRIMP 攀西米易撒莲镇 Xu et al., 2008 261.4±2.3 A型花岗岩 SHRIMP 攀西太和侵入岩 Xu et al., 2008 266.5±5.1 辉石正长岩 SHRIMP 攀西米易黄草岩体 Xu et al., 2008 255.2±3.6 过铝质花岗岩 SHRIMP 攀西红格侵入岩附近矮郎河 Xu et al., 2008 238.4±3.4 流纹凝灰岩 SHRIMP 云南宾川 Xu et al., 2008 255.0±0.62 辉绿岩 LA-ICP-MS 贵州罗甸 韩伟等, 2009 261±2 辉长岩 SHRIMP 攀西白马侵入岩 Shellnutt et al., 2009 253.1±1.9 正长岩 SHRIMP 攀枝花侵入岩中正长岩侵入体 Zhong et al., 2009 259.69±0.61 辉长苏长岩 LA-ICP-MS 攀西大板山 王萌等, 2011 251.0±1.0 凝灰岩 LA-ICP-MS 贵州盘县 朱江等，2011 260±8 花岗岩 SHRIMP 攀西营盘梁子岩体 Shellnutt et al., 2011 261±5 镁铁质岩墙 SHRIMP 攀枝花市南部 Shellnutt and Jahn, 2011 259.5±2.7 镁铁质包体 LA-ICP-MS 攀西白马侵入岩 Zhong et al., 2011 259.0±3.1 镁铁质包体 LA-ICP-MS 攀西白马侵入岩 Zhong et al., 2011 258.2±2.2 辉长岩 LA-ICP-MS 攀西白马侵入岩 Zhong et al., 2011 258.5±2.3 正长岩 LA-ICP-MS 攀西白马侵入岩 Zhong et al., 2011 257.8±2.6 正长岩 LA-ICP-MS 攀西白马侵入岩 Zhong et al., 2011 256.2±1.5 花岗岩 LA-ICP-MS 攀西白马侵入岩 Zhong et al., 2011 257.9±2.4 辉长岩 LA-ICP-MS 攀枝花侵入岩 Zhong et al., 2011 255.4±3.1 辉长岩 LA-ICP-MS 攀枝花侵入岩 Zhong et al., 2011 259.5±1.1 正长闪长岩 LA-ICP-MS 攀枝花侵入岩 Zhong et al., 2011 259.2±1.3 正长闪长岩 LA-ICP-MS 攀枝花侵入岩 Zhong et al., 2011 257.8±2.3 正长闪长岩 LA-ICP-MS 攀枝花侵入岩 Zhong et al., 2011 259.8±1.6 正长闪长岩 LA-ICP-MS 攀枝花侵入岩 Zhong et al., 2011 255.8±1.8 正长岩 LA-ICP-MS 攀枝花侵入岩 Zhong et al., 2011 258.7±2.0 辉长岩 LA-ICP-MS 攀西红格侵入岩 Zhong et al., 2011 258.9±2.1 辉长岩 LA-ICP-MS 攀西红格侵入岩 Zhong et al., 2011 256.8±2.8 I型花岗岩 LA-ICP-MS 攀西红格侵入岩 Zhong et al., 2011 256.2±3.0 I型花岗岩 LA-ICP-MS 攀西红格侵入岩 Zhong et al., 2011 258.8±2.3 辉长岩 LA-ICP-MS 攀西太和侵入岩 Zhong et al., 2011 257.6±0.5 镁铁质侵入岩 CA-TIMS 侵入攀西沃水过铝质正长岩中 Shellnutt et al., 2012 259.2±0.4 镁铁质岩墙 CA-TIMS 侵入攀西白马侵入岩的过碱性正长岩中 Shellnutt et al., 2012 259.4±0.8 镁铁质岩墙 CA-TIMS 侵入攀西白马侵入岩的过碱性正长岩中 Shellnutt et al., 2012 259.6±0.5 准铝质正长岩 CA-TIMS 攀西沃水岩体 Shellnutt et al., 2012 259.1±0.5 准铝质正长岩 CA-TIMS 攀西大黑山岩体 Shellnutt et al., 2012 258.9±0.7 准铝质正长岩 CA-TIMS 攀西草黄岩体 Shellnutt et al., 2012 258.4±0.6 花岗岩 CA-TIMS 攀西白马侵入岩附近茨达 Shellnutt et al., 2012 257±9 玄武岩 LA-ICP-MS 广西 Lai et al., 2012 256.7±4.3 基性岩墙 LA-ICP-MS 四川冕宁 Li, 2012 257.6±2 基性岩墙 LA-ICP-MS 云南富民 Li, 2012 255.1±3. 6 黑云母二长花岗岩 LA-ICP-MS 侵入攀西红格岩体内部的大老包花岗岩 程黎鹿等, 2013 261.4±4.6 苦橄质岩墙 LA-ICP-MS 攀枝花岩体 Hou et al., 2013 263±10 辉绿岩 LA-ICP-MS 贵州普安 曾广乾等, 2014 259.1±0.5 长英质熔结凝灰岩 CA-TIMS 云南江尾镇宾川剖面 Zhong et al., 2014 259.9±1.1 辉长岩 LA-ICP-MS 攀西大板山 Liu et al., 2015 260.3±1.3 辉长苏长岩 LA-ICP-MS 攀西大板山 Liu et al., 2015 262~249 花岗岩和流纹岩 LA-ICP-MS 越南北部Phan Si Pan-Tu Le地区 Usuki et al., 2015 264±3 基性岩墙(斜锆石) SIMS 云南武定 Fan et al., 2017 256±5 基性岩墙(斜锆石) SIMS 云南武定 Fan et al., 2017
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