Petrogenesis and Tectonic Implications of ~2.33 Ga Luobuqigou Diabase-Gabbro in Northern End of Trans-North China Orogen of North China Craton
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摘要: 古元古代早期岩浆活动对理解华北克拉通中部造山带构造演化史和地球动力学过程具有重要意义.首次在中部造山带北端赤峰南部罗卜起沟发现早古元古代辉绿辉长岩，并对其开展了详细的岩相学、全岩地球化学、锆石U-Pb-Hf同位素地球化学研究.锆石U-Pb同位素定年结果表明辉绿辉长岩侵入年龄为2 332 Ma.地球化学特征表明，辉绿辉长岩属于拉斑玄武岩系列，具Rb、Ba、U、Pb正异常，Sr、Nb、Th、Y负异常，具有相对较缓的右倾REE配分模式，LREE相对于HREE弱富集，Eu异常不明显.锆石εHf（t）值为-4.4~-0.8，单阶段模式年龄tDM1为2 722~2 837 Ma.岩石成因研究表明辉绿辉长岩岩浆起源于有软流圈地幔参与的大陆岩石圈富集地幔，富集地幔源为10%~20%部分熔融的含尖晶石和石榴石二辉橄榄岩地幔.其岩浆演化以单斜辉石分离结晶为主，橄榄石和斜长石次之，地壳混染影响有限.综合研究表明，早古元古代构造‒岩浆寂静期中部造山带北端赤峰南部罗卜起沟~2.33 Ga辉绿辉长岩可能处于弧后伸展裂谷环境.研究区可能经历了板块后撤引发的软流圈上涌、岩石圈减薄的地球动力学过程.研究结果为古元古代早期华北克拉通中部造山带北端构造演化提供约束和借鉴.Abstract: The magmatic activities in the Early Paleoproterozoic are of great significance for understanding the tectonic evolution history and geodynamic processes of the Trans-North China Orogen (TNCO) in the North China Craton (NCC). In this study, the Early Paleoproterozoic diabase-gabbro was discovered for the first time in the Luobuqigou area of southern Chifeng at the northern end of the TNCO, and detailed petrography, whole rock geochemistry and zircon U-Pb-Hf isotope geochemistry studies were carried out. Zircon U-Pb isotopic dating reveals that the intrusion age of diabase-gabbro is 2 332 Ma. The geochemical characteristics indicate that the diabase-gabbro belongs to the tholeiitic basalt series. It shows positive anomalies of Rb, Ba, U and Pb, and negative anomalies of Sr, Nb, Th and Y. It has a relatively gentle right-dipping REE distribution pattern, with a weak enrichment of LREE relative to HREE, and the Eu anomaly is not obvious. Zircon εHf(t) value ranging from -4.4 to -0.8, and the single-stage Hf model age tDM1 range from 2 722 Ma to 2 873 Ma. Petrogenetic studies have shown that the diabase-gabbro magma originated from the enriched subcontinent lithosphere mantle with the participation of the asthenospheric mantle. The enriched mantle source is a 10% to 20% partially melted spinel- and garnet-bearing lherzolite mantle. Its magma evolution is dominated by the fractional crystallization of clinopyroxene, followed by olivine and plagioclase, and the influence of crustal contamination was limited. The comprehensive study shows that the ~2.33 Ga diabase-gabbro in the Luobuqigou area of southern Chifeng at the northern end of the TNCO during the Early Proterozoic tectono-magmatic lull (TML) period, might beformed in a back-arc extensional rift environment. The study area might have experienced the geodynamic process of asthenosphere upwelling and lithosphere thinning caused by plate rollback. Our research results provide constraints and references for the tectonic evolution of the northern end of the TNCO in the NCC during the Early Paleoproterozoic.
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图 1 华北克拉通构造简图(a)及小牛群‒罗卜起沟地区地质简图(b)
图a据Zhao et al., 2005. 图b据核工业二〇八大队，2015；内蒙古赤峰地质矿产勘查开发院，2016
Fig. 1. Tectonic map of the North China Craton (a) and geological sketch map of Luobuqigou-Xiaoniuqun area (b)
图 2 罗卜起沟辉绿辉长岩野外露头照片
a.罗卜起沟辉绿辉长岩野外照片及其与斑状二长花岗岩关系；b、c.古元古代早期辉绿辉长岩采样位置之一及样品照片；d.罗卜起沟老矿部后山东坡2.33 Ga辉绿辉长岩被1.86 Ga斑状二长花岗岩侵入照片
Fig. 2. Field photographs of the diabase-gabbro in the Luobuqigou area
图 3 罗卜起沟辉绿辉长岩显微镜下照片
Cpx.单斜辉石；Pl.斜长石；Hbl.角闪石；Chl.绿泥石；Mag.磁铁矿
Fig. 3. Photomicrographs (a、b) of the diabase-gabbro in the Luobuqigou area
图 4 罗卜起沟辉绿辉长岩锆石U-Pb年龄谐和图及典型锆石阴极发光图像
实线圈为锆石U-Pb测试点位，虚线圈为锆石Lu-Hf同位素测试点位
Fig. 4. Zircon U-Pb isotopic concordia diagrams and the representative CL images of analyzed zircons from the diabase-gabbro in the Luobuqigou area
图 5 罗卜起沟辉绿辉长岩岩石分类图解
a. Nb/Y-Zr/TiO2×0.000 1图解（据Winchester and Floyd, 1977）；b. SiO2-FeOT/MgO图解（据Miyashiro，1975）
Fig. 5. Geochemical classification diagrams of the diabase-gabbro in the Luobuqigou area
图 6 罗卜起沟辉绿辉长岩哈克图解
R值为Pearson相关系数
Fig. 6. Harker plots of the diabase-gabbro in the Luobuqigou area
图 7 罗卜起沟辉绿辉长岩稀土元素球粒陨石标准化配分图(a)和微量元素原始地幔标准化蛛网图(b)
球粒陨石、原始地幔、N-MORB、E-MORB和OIB数据均源自Sun and McDonough（1989）
Fig. 7. Chondrite-normalized rare elemental patterns (a) and primitive mantle-normalized trace elemental patterns (b) of diabase-gabbro in the Luobuqigou area
图 8 罗卜起沟辉绿辉长岩Pearce元素比值图
据Russell and Nicholls, 1988. 矿物缩写：Ol.橄榄石；Opx.斜方辉石；Cpx.单斜辉石；Plg.斜长石
Fig. 8. Pearce element ratio diagrams fordiabase-gabbroin the Luobuqigou area
图 9 罗卜起沟辉绿辉长岩Nb/La-La/Yb (a)、Nb/Yb-Th/Yb (b)、Nb/Yb-TiO2/Yb (c)、LaN/SmN-TbN/YbN (d)地幔源区判别图解
图a~c据 Pearce, 2008, 2014；图d据Wang et al.（2002）
Fig. 9. (a) Nb/La-La/Yb; (b) Nb/Yb-Th/Yb; (c) Nb/Yb-TiO2/Yb; (d) LaN/SmN-TbN/YbN diagrams of mantle source for diabase-gabbroin the Luobuqigou area
图 10 罗卜起沟辉绿辉长岩Dy/Dy*-Dy/Yb (a)、La/Sm-Sm/Yb (b)地幔源性质及部分熔融图解
图a中Dy/Dy*定义来自Davidson et al.（2013）.图b据Aldanmaz et al.（2000），黑色虚线和彩色虚线分别表示亏损MORB地幔（DMM）和富集的大陆岩石圈地幔（SCLM）熔融趋势，百分数为熔融程度；其中garnet-lherzolite（grt）.石榴石二辉橄榄岩；spinel-lherzolite（sp）.尖晶石二辉橄榄岩；DMM.亏损洋中脊玄武岩地幔；N/E-MORB.正常/富集洋中脊玄武岩；OIB.洋中脊玄武岩；PM.原始地幔；GLOSS.全球俯冲沉积物
Fig. 10. Dy/Dy*-Dy/Yb (a), La/Sm-Sm/Yb (b) diagrams of nature and partial melting of mantle source for diabase-gabbro in the Luobuqigou area
图 11 罗卜起沟辉绿辉长岩Zr-Zr/Y (a)、Ta/Hf-Th/Hf (b)、2Nb-Zr/4-Y (c)图解
图a据Pearce and Norry, 1979；图b据汪云亮等，2001；图c据Meschede，1986. b. Ⅰ.正常洋中脊玄武岩；Ⅱ1.洋岛玄武岩；Ⅱ2.大陆边缘岛弧玄武岩；Ⅲ.洋岛玄武岩、过渡洋中脊玄武岩、富集洋中脊玄武岩；Ⅳ1.陆内裂谷拉斑玄武岩；Ⅳ2.大陆伸展/裂谷玄武岩；Ⅳ3.陆内钙碱性玄武岩；V.地幔柱玄武岩.c. AI-AII.板内碱性玄武岩；AII-C.板内拉斑玄武岩；C.板内玄武岩；D.正常洋中脊玄武岩；B.富集洋中脊玄武岩
Fig. 11. Zr-Zr/Y (a), Ta/Hf-Th/Hf (b), 2Nb-Zr/4-Y (c) diagrams for diabase-gabbro in the Luobuqigou area
表 1 罗卜起沟古元古代早期辉绿辉长岩LA-ICP-MS锆石U-Pb定年结果
Table 1. LA-ICP-MS zircon U-Pb dating results for the Early Paleoproterozoic diabase-gabbro in the Luobuqigou area
测点号 Pb Th U Th/U 207Pb/206Pb 2σ 207Pb/235U 2σ 206Pb/238U 2σ 207Pb/206Pb 2σ 谐和度 含量(10‒6) 同位素比值 年龄(Ma) A1 157 142 203 0.70 0.150 4 0.004 4 9.070 0 0.280 0 0.442 2 0.011 0 2 350 24 99 A2 95 68 90.3 0.75 0.147 9 0.009 0 8.970 0 0.460 0 0.430 2 0.018 6 2 322 40 99 A3 36.3 31.3 44.8 0.70 0.150 7 0.008 0 9.090 0 0.480 0 0.441 1 0.015 4 2 354 46 100 A4 113 97 164 0.59 0.151 4 0.005 6 9.070 0 0.380 0 0.435 2 0.008 8 2 362 44 99 A5 324 241 807 0.30 0.170 3 0.002 2 11.602 0 0.178 0 0.488 9 0.010 4 2 561 18 100 A6 61.2 54.4 106 0.51 0.147 1 0.005 4 8.580 0 0.380 0 0.426 1 0.015 2 2 312 34 100 A7 69.9 59.8 142 0.42 0.148 6 0.004 0 9.160 0 0.420 0 0.441 8 0.015 0 2 330 38 100 A8 41.6 38.7 67.3 0.58 0.147 7 0.007 6 8.900 0 0.420 0 0.446 9 0.015 8 2 319 38 98 A9 49.9 52.6 260 0.20 0.142 0 0.009 4 7.350 0 0.700 0 0.392 0 0.022 0 2 252 90 99 A10 66.7 62.6 105 0.60 0.151 9 0.008 2 8.930 0 0.540 0 0.440 4 0.019 0 2 367 50 99 A11 37.6 33.3 58.5 0.57 0.145 0 0.008 2 8.770 0 0.580 0 0.443 5 0.018 2 2 288 60 98 A12 73 63.4 130 0.49 0.142 8 0.008 2 8.480 0 1.000 0 0.430 0 0.046 0 2 261 90 99 A13 110 92.6 104 0.89 0.144 9 0.007 4 8.610 0 0.420 0 0.4291 0.014 4 2 287 42 100 A14 73.6 77.2 330 0.23 0.145 8 0.006 8 7.910 0 0.580 0 0.411 0 0.028 0 2 297 56 100 A15 117 106 251 0.42 0.140 5 0.008 4 6.570 0 0.480 0 0.354 0 0.030 0 2 233 66 95 A16 113 111 212 0.52 0.139 8 0.005 8 6.830 0 0.420 0 0.363 0 0.020 0 2 225 48 95 A17 124 76.6 278 0.28 0.142 7 0.004 0 7.249 5 0.273 7 0.365 3 0.015 1 2 256 49 93 A18 94.1 117 174 0.68 0.149 0 0.004 2 8.418 5 0.411 1 0.405 5 0.016 7 2 330 50 96 A19 77.3 40.2 147 0.27 0.152 5 0.004 7 8.986 5 0.389 7 0.423 7 0.016 9 2 369 52 97 A20 34.1 26.4 59.7 0.44 0.153 0 0.008 7 9.606 4 0.371 2 0.462 1 0.020 5 2 365 94 99 A21 55.4 37.1 97.3 0.38 0.146 9 0.004 5 9.115 6 0.454 0 0.444 6 0.014 6 2 305 52 99 A22 98.2 54.9 244 0.22 0.141 6 0.003 9 6.554 6 0.320 4 0.336 2 0.008 2 2 242 47 90 A23 43.3 34.7 83.4 0.42 0.152 4 0.005 2 8.550 9 0.482 9 0.402 4 0.017 1 2 366 61 95 A24 75.9 62.3 132 0.47 0.151 5 0.004 5 9.132 3 0.342 1 0.430 3 0.011 4 2 358 50 98 A25 104 88.7 223 0.40 0.144 3 0.002 5 7.501 8 0.267 4 0.374 1 0.012 6 2 277 30 94 A26 96.3 68.4 183.1 0.37 0.146 9 0.003 7 8.486 3 0.424 3 0.417 6 0.014 5 2 322 33 99 A27 43.7 32.6 69.0 0.47 0.150 0 0.004 3 10.112 3 0.476 6 0.485 0 0.019 5 2 341 49 96 A28 45.5 33.1 80.1 0.41 0.152 7 0.003 9 9.638 6 0.452 2 0.455 2 0.016 0 2 373 45 99 A29 70.2 73.6 114 0.65 0.152 2 0.005 4 9.527 6 0.478 8 0.451 7 0.013 1 2 364 62 99 A30 102 43.2 188 0.23 0.147 1 0.003 8 9.206 7 0.451 0 0.450 9 0.014 7 2 309 45 98 A31 108 78.7 243 0.32 0.140 0 0.003 7 6.886 4 0.362 8 0.355 4 0.017 0 2 223 45 93 A32 123 251 265 0.95 0.141 0 0.003 6 6.719 5 0.626 2 0.343 4 0.027 3 2 235 45 91 A33 100 47.9 202 0.24 0.144 5 0.003 5 7.766 5 0.426 7 0.389 0 0.016 4 2 278 42 96 
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表 2 罗卜起沟古元古代早期辉绿辉长岩LA-ICP-MS锆石Lu-Hf同位素结果
Table 2. LA-ICP-MS zircon Lu-Hf isotope results for the Early Paleoproterozoic diabase-gabbro in the Luobuqigou area
测点号 t (Ma) 176Yb/177Hf 176Lu/177Hf 176Hf/177Hf 2σ 176Hf/177Hfi εHf(0) εHf(t) 2σ tDM1(Ma) fLu/Hf A1 2 350 0.014 260 0.000 526 0.281 255 0.000 012 0.281 232 ‒53.6 ‒1.8 0.4 2 749 ‒0.98 A2 2 322 0.018 350 0.000 602 0.281 252 0.000 012 0.281 226 ‒53.7 ‒2.7 0.4 2 759 ‒0.98 A3 2 354 0.012 537 0.000 436 0.281 225 0.000 012 0.281 205 ‒54.7 ‒2.7 0.4 2 783 ‒0.99 A4 2 362 0.018 139 0.000 629 0.281 281 0.000 012 0.281 252 ‒52.7 ‒0.8 0.4 2 722 ‒0.98 A6 2 312 0.010 523 0.000 414 0.281 246 0.000 011 0.281 228 ‒54.0 ‒2.8 0.4 2 754 ‒0.99 A7 2 330 0.012 734 0.000 470 0.281 259 0.000 012 0.281 238 ‒53.5 ‒2.0 0.4 2 740 ‒0.99 A8 2 319 0.015 636 0.000 608 0.281 246 0.000 015 0.281 219 ‒54.0 ‒3.0 0.5 2 768 ‒0.98 A13 2 287 0.025 005 0.000 985 0.281 262 0.000 021 0.281 219 ‒53.4 ‒3.7 0.8 2 773 ‒0.97 A14 2 297 0.015 112 0.000 610 0.281 222 0.000 017 0.281 195 ‒54.8 ‒4.3 0.6 2 800 ‒0.98 A17 2 256 0.023 534 0.000 875 0.281 266 0.000 013 0.281 229 ‒53.2 ‒4.1 0.5 2 759 ‒0.97 A21 2 305 0.019 707 0.000 708 0.281 278 0.000 014 0.281 247 ‒52.8 ‒2.3 0.5 2 732 ‒0.98 A23 2 366 0.008 874 0.000 302 0.281 240 0.000 012 0.281 226 ‒54.2 ‒1.6 0.4 2 754 ‒0.99 A24 2 358 0.025 860 0.000 905 0.281 258 0.000 012 0.281 217 ‒53.5 ‒2.1 0.4 2 773 ‒0.97 A25 2 277 0.024 889 0.000 963 0.281 247 0.000 019 0.281 205 ‒53.9 ‒4.4 0.7 2 792 ‒0.97 A26 2 322 0.036 846 0.001 326 0.281 263 0.000 017 0.281 204 ‒53.4 ‒3.4 0.6 2 796 ‒0.96 A27 2 341 0.016 067 0.000 605 0.281 260 0.000 012 0.281 233 ‒53.5 ‒2.0 0.4 2 749 ‒0.98 A28 2 373 0.012 245 0.000 479 0.281 255 0.000 014 0.281 234 ‒53.6 ‒1.2 0.5 2 746 ‒0.99 A29 2 364 0.025 627 0.001 015 0.281 217 0.000 014 0.281 171 ‒55.0 ‒3.7 0.5 2 837 ‒0.97 A30 2 309 0.015 799 0.000 600 0.281 273 0.000 012 0.281 247 ‒53.0 ‒2.2 0.4 2 730 ‒0.98 A33 2 278 0.022 936 0.000 937 0.281 274 0.000 017 0.281 233 ‒53.0 ‒3.4 0.6 2 753 ‒0.97
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表 3 罗卜起沟古元古代早期辉绿辉长岩的全岩主量(%)和微量元素(10-6)分析结果
Table 3. Analyzed whole-rock major (%) and trace (10-6) element results for the Early Paleoproterozoic diabase-gabbro in the Luobuqigou area
样品号 LBQG-H2 LBQG-H3 LBQG-H4 LBQG-H5 LBQG-H6 LBQG-H7 LBQG-H8 LBQG-H9 LBQG-H11 SiO2 46.8 46.77 47.75 45.07 43.04 44.27 46.83 47.09 47.64 TiO2 2.48 2.85 2.53 2.2 2.28 2.95 1.72 1.74 1.99 Al2O3 13.17 11.78 13.86 12.11 12.43 12.29 13.94 13.58 12.93 Fe2O3T 15.67 17.01 13.44 13.82 16.84 17.3 13.75 13.87 14.03 MnO 0.2 0.21 0.18 0.19 0.2 0.22 0.21 0.28 0.29 MgO 5.43 4.53 6.01 5.65 6.17 5.26 6.9 6.88 6.16 CaO 5.1 5.63 6.69 8.08 7.33 6.21 9.15 7.07 8.51 Na2O 2.56 2.24 2.32 2.21 1.34 1.72 2.69 1.9 3.92 K2O 2.42 1.89 1.99 0.46 0.46 3.1 1.32 3.88 0.38 P2O5 0.23 0.28 0.22 0.19 0.19 0.27 0.15 0.16 0.18 LOI 5.81 7.24 5.16 10.1 9.8 6.59 2.78 2.7 3.69 Total 99.87 100.43 100.15 100.08 100.08 100.18 99.44 99.15 99.72 FeO 10.96 9.12 7.47 10.78 12.21 8.48 7.54 7.31 8.23 Mg# 44.68 38.30 51.03 48.79 46.06 41.47 53.91 53.62 50.57 Li 48.0 60.5 37.6 66.4 75.3 35.9 28.6 27.9 16.7 Be 2.19 2.59 1.91 1.69 1.69 1.92 0.86 0.87 1.44 Sc 35.8 38.1 37.5 34.1 36.0 39.8 41.9 43.6 38.1 Ti 15 849 18 309 16 005 14 276 14 826 18 058 12 217 12 656 11 925 V 433 588 456 399 439 599 446 459 445 Cr 76.4 63.4 123 125 129 67.4 128 127 71.8 Mn 1 651 1 773 1 402 1 547 1 657 1 738 1 849 2 543 2 205 Co 52.6 52.7 48.1 52.4 61.9 57.8 62.0 62.7 49.3 Ni 58.0 48.5 70.3 67.3 70.2 48.7 86.1 87.5 53.1 Cu 97.0 83.9 183 110 51.5 162 98.8 29.9 490 Zn 129 235 104 113 141 261 169 263 188 Ga 21.8 21.3 20.5 19.2 21.4 21.3 22.0 21.9 19.3 Ge 1.63 1.92 2.00 2.08 2.49 1.92 2.05 2.37 2.19 As 2.18 6.90 3.36 3.09 5.42 3.57 16.29 7.34 5.01 Rb 115 62.7 102 19.0 19.6 88.0 46.4 192 12.7 Sr 112 204 321 237 204 89 418 316 223 Y 30.3 33.5 27.9 25.3 27.2 30.0 23.9 24.9 25.7 Zr 209 227 204 173 183 212 151 155 153 Nb 12.9 17.3 14.6 12.7 13.6 16.0 9.82 10.3 10.1 Mo 0.89 0.62 0.97 1.00 0.92 0.68 0.54 0.46 0.52 In 0.12 0.13 0.10 0.09 0.09 0.10 0.10 0.10 0.09 Cd 0.10 0.15 0.11 0.13 0.10 0.14 0.13 0.10 0.11 Sn 1.68 1.82 1.75 1.83 1.20 1.67 1.27 1.27 1.34 Sb 6.36 8.23 5.56 6.22 7.30 6.75 8.19 8.20 7.93 Cs 5.43 1.69 1.50 0.76 0.73 0.83 0.35 1.14 1.38 Ba 342 431 450 109 100 500 254 1588 59.8 La 13.4 18.7 15.7 13.0 13.8 15.6 12.9 13.3 13.9 Ce 36.1 47.0 40.4 34.5 36.0 41.0 30.9 31.5 34.6 Pr 4.09 5.08 4.45 3.84 4.05 4.44 3.37 3.35 3.60 Nd 21.9 25.8 23.1 20.0 21.1 22.8 17.4 17.5 18.6 Sm 5.83 6.59 5.93 5.16 5.59 5.90 4.53 4.54 4.91 Eu 2.02 2.42 2.10 1.50 1.64 2.10 1.77 2.39 1.68 Gd 6.74 7.86 7.00 5.75 6.68 6.97 5.06 5.57 5.59 Tb 1.17 1.28 1.09 0.97 1.10 1.14 0.91 0.91 0.98 Dy 6.80 7.65 6.41 5.72 6.55 6.76 5.39 5.41 5.83 Ho 1.25 1.42 1.18 1.03 1.18 1.26 0.99 1.00 1.08 Er 3.91 4.53 3.70 3.24 3.60 4.05 3.29 3.29 3.42 Tm 0.47 0.55 0.45 0.39 0.43 0.49 0.40 0.40 0.41 Yb 3.22 3.84 3.02 2.71 2.95 3.48 2.86 2.80 2.92 Lu 0.43 0.51 0.41 0.34 0.39 0.47 0.38 0.38 0.39 Hf 5.59 6.09 5.54 4.75 5.18 5.77 4.29 4.27 4.24 Ta 0.95 1.24 1.09 0.95 1.03 1.19 0.73 0.76 0.79 W 1.51 7.71 1.45 2.05 1.94 2.79 1.42 1.09 1.64 Tl 0.55 0.30 0.45 0.09 0.09 0.40 0.18 0.77 0.07 Pb 2.46 11.1 4.50 4.19 5.74 12.9 15.6 9.73 9.83 Bi 0.13 0.06 0.03 0.13 0.23 0.04 0.04 0.05 0.03 Th 1.55 2.27 2.08 1.78 2.03 2.09 2.11 2.12 2.16 U 0.48 0.65 0.77 0.67 0.73 0.55 0.53 0.50 0.61 ΣREE 107 133 115 98.1 105 116 90.1 92.3 97.9 LREE 83.30 106 91.7 78.0 82.2 91.8 70.8 72.5 77.2 HREE 23.99 27.6 23.3 20.1 22.9 24.6 19.3 19.8 20.6 LREE/HREE 3.47 3.82 3.95 3.87 3.60 3.73 3.68 3.67 3.75 LaN/YbN 2.99 3.49 3.74 3.44 3.35 3.21 3.24 3.40 3.41 δEu 0.98 1.03 1.00 0.84 0.82 1.00 1.13 1.45 0.98 δCe 1.20 1.18 1.18 1.20 1.18 1.21 1.15 1.16 1.20 注：LOI为烧失量; Mg#=100×(MgO/40.30)/(MgO/40.30+Fe2O3T×0.899 8/71.839×(1-0.15)); δEu=EuCN/(SmCN×GdCN)1/2，δCe= CeCN/(LaCN×PrCN)1/2，CN为球粒陨石标准化(Sun and McDonough, 1989).
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