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1 Vol.31 No.1 : Acta Geoscientica Sinica Feb. 2010: www. 地球学报.com 1,2), 2), 2), 3), 2), 4), 1), 4), 5), 5) 1), ; 2), ; 3), ; 4), ; 5), 摘要 : (ICP-MS) V Ni Cr U Th, Eu δeu 0.63~10.61( 1.54), Ce δce 0.65~1.02( 0.893) ; U/Th 0.38~4.07, w (V)/w (V +Ni) 0.38~0.93 w (Ce)/w (La) 1.27~2.17, La/Yb-Ce/La La/Yb-REE,, 关键词 : ; ; ; ; 中图分类号 : P595; P618.7; P 文献标志码 : A 文章编号 : (2010) REE Geochemical Characteristics of the Miaowan Formation Black Rock Series in North Qinling Mountain and Their Genetic Significance WANG Li-she 1,2), HOU Jun-fu 2), ZHANG Fu-xin 2), QIN Yan 3), CAO Hong-xia 2), QI Ya-lin 4), YANG Peng-fei 1), JIN Suan-lian 4), FANG Bo 5), ZHOU Yan 5) 1) Xi an Geological Survey Center, Xi an, Shaanxi ; 2) State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi an, Shaanxi ; 3) Institution of Geochemistry, Chinese Academy of Sciences, Guangzhou, Guangdong ; 4) Research Institute of Changqing Oil Company, PetroChina Limited Company, Xi an, Shaanxi ; 5) Plant of Qinghai OilField, PetroChina Limited Company, Dunhuang, Gansu Abstract: The abundances of rare earth elements and some trace elements such as V, Ni, Cr, U and Th of the black rock series from the Miaowan Formation in North Qinling Mountain were measured by using the ICP-MS method. The results show that the black rock series of the Miaowan Formation is usually of the LREE-enriched type, that the samples are characterized by slightly negative or positive Ce anomalies (δce=0.65~1.02) and distinct positive Eu anomalies (with δeu mostly higher than 1.54), and that the ratios of U/Th display a wide variation range from 0.38 to 4.07, the ratios of w (V) /w (V +Ni)(= 0.38~0.93) are normal, and the ratios of w (Ce)/w (La) (=1.27~2.17) are relatively high. A study of the parameters of REE and trace elements in comparison with the available data and an analysis of the La/Yb-Ce/La and La/Yb- REE diagrams reveal that the black rock series was formed in a dry, anoxic and shallow sea environment belonging to an active continental margin, with the participation of some hydrothermal fluids. Key words: Miaowan Formation; black rock series; REE geochemistry; dry and anoxic environment; Northern Qinling ( : [2006]) - ( : ) : ; : :,, xawlishe@cgs.gov.cn

2 74 ( C 1%) ( ) ( ) (, 1973),, PGE Hg B As Mn Sb Au Ag Pb P Ba U Mo V Zn Cu Co Ni, (, 2005;, 2007), (, 2004;, 2000),,, (, 1999;, 2000;, 2002;, 2004;, 2004;, 2004;, 2005) (, 2003;, 2005) (, 2002) (, 2001;, 2002;, 2005) (, 2006;, 2007) (, 2000;, 2001;, 2003;, 2005) (, 2005),,, (Om) 1 区域地质概况 1982,, - ; - (, 1983),,, 4, Fig. 1 图 1 北秦岭黑色岩系剖面位置图 Geological map showing section locality of the black rock series in North Qinling Mountain a. ; b. a. Baishigou section; b. Jiangshan village section Fig. 2 图 2 北秦岭庙湾组黑色岩系剖面 Sections of the Miaowan Formation black rock series in North Qinling Mountain a. ; b. a. Baishigou area; b. Jiangshan village area

3 : 75 Table 1 表 1 北秦岭庙湾组黑色岩系稀土元素和部分微量元素分析结果及有关参数 /10-6 REE and some trace elements analyses and related parameters of the Miaowan formation black rock series in northern Qinling mountain H-BS-2 H-BS-3 H-BS-4 H-JS-1 H-JS-4 H-JS-5 H-JS-6 La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Y ΣREE LREE HREE LREE/HREE (La/Yb) N (La/Sm) N (Tb/Yb) N δeu N δce N (La/Yb) S (La/Sm) S (Tb/Yb) S δeu S δce S Ce/La V Zn Co Ni Th U V/(V+Ni) U/Th V/Cr Ni/Co Co/Zn : ICP-MS ( N, S )

4 76 (Om) (Oq) (Os) (Og),,,, ( ); ), ;,,, 4 km (, (Mattauer et al., 1985;, 1995, 1996);, (Pelzer et al., 1988; Zhang et al., 1995) 2 稀土元素地球化学特征及探讨 1,,, ( REE) ( );, ( REE) ( LREE) ( HREE),,, 87 ( ~ ) (, 2004), LREE/HREE ( LREE/HREE 5.82~15.61), ( 3), REE, (La/Yb) N =3.41~25.89>1;, (La/Sm) N = 3.61~8.7), (Tb/Yb) N =0.75~ 1.80;, ( 4), ( (La/Yb) S 1.49),, (La/Sm) S 1.03~2.48,, (Tb/Yb) S 0.7~1.69; Eu Ce (, 2004), Eu 图 3 黑色岩系球粒陨石标准化图解 ( 标准化值据 Sun 等, 1989) Fig. 3 Chondrite-normalized REE-patterns for the Miao wan formation black rock series (modified from Sun et al., 1989) 图 4 黑色岩系北美页岩标准化图解 ( 标准化值据 Haskin 等, 1968) Fig. 4 NAAS-normalized rare earth element patterns for the black rock series (modified from Haskin et al., 1968)

5 : 77 Eu Eu,, (>250 ), (Michard et al., 1983; Michard et al., 1986), (Campbell et al., 1988), (Fouquet et al., 1993), Eu (Klinkhammer et al., 1994; Michael et al., 1999;, 2000),, Eu Ce Eu, Ce (Murray et al., 1991;, 2004) Eu Eu 2+, Eu 3+, Eu (Sverjensky, 1984) > 250, Eu,, Eu (, 2000), Eu Eu 2+ Eu, Eu Eu : Ca, Ca Eu ;, Eu 2+ (Sverjensky, 1984) 7 6 δeu> ,, U/Th, U/Th< 1, U/Th>1(Bostrom, 1983), U/Th 0.38~4.07, Eu (, 1993) Ce Ce, Ce, Ce 3+, Ce 3+ Ce 4+ (, 1998) Brookins(1984) ( Pa ),, Ce 3+ Ce 4+ Eh, Ce, Ce, Ce (, 1996),, Ce Ce +4 (Meller, 1994) Ce 4+, Ce, ;, Ce +3, Ce, (De Barr, 1985; Wilde, 1996), Ce (Wright, 1984) Ce Ce :,, Ce ;,, Ce (Wilde, 1996) δce ( 0.893), Ce (Murray et al., 1991;, 2004),, (Bai et al., 1994) : w (Ce) /w (La) < 1.5, w (Ce) /w (La) = 1.5~1.8, w (Ce) /w (La) > 2.0 (Hatch et al., 1992), w (V) /w (V+Ni) : w (V) /w (V+Ni) (0.84~0.89), H 2 S, (0.54~0.82), (0.46~0.60) w (Ce)/w (La) 1.27~2.17( 1.75) w (V)/w (V +Ni) 0.38~0.93( 0.7),,, La/Yb-Ce/La( 5) La/Yb-REE( 6),,, 3 结论 (1) (Om),

6 78 图 5 庙湾组黑色岩系 La/Yb-Ce/La 图解 ( 据 Kunzendof 等, 1988) Fig.5 La/Yb-Ce/La diagram for the Miao wan formation black rock series (modified from Kunzendof et al., 1988) 图 6 黑色岩系 La/Yb-REE 图解 ( 据 Allegre 等, 1978) Fig.6 La/Yb-REE diagram for the Miao wan formation black rock series (modified from Allegre et al., 1978) 1. chondrite; 2. oceanic tholeiite; 3. continental tholeiite; 4. alkali basalt; 5. granite; 6. kimberlite; 7. carbonate rock; 8. sedimentary rock (2), ( ) ( ), (3) REE,, (LREE/HREE 5.82~15.61, La N /Yb N = >1), (La N /Sm N =3.61~8.7), (Tb N /Yb N =0.75~1.8); ( La S /Yb S 1.49) (4) Eu δeu=0.63~10.61( 1.54>1), δce 0.65~1.02( 0.893) ; U/Th 0.38~4.07, w (V)/w (V+Ni) 0.38~0.93 w(ce)/w (La) 1.27~ 2.17 (5) La/Yb-Ce/La La/Yb-REE,,,,, (, 2003), (, 2003),,,, -,, 致谢 : 本文工作得到高菊生李建斌任涛樊忠平郑炜谭文娟等同志的大力支持, 审稿人以及责任编辑给本文提出了宝贵的修改建议, 在此一并谢过! 参考文献 :,, [J]., 21(2): ,,,,, [J]., 20(3): , [J]., 37(3): ,, [J]., 18(2):

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