Geochronology and origin of the Laoniushan complex in the southern margin of North China Block and their implications: New evidences from zircon dating, Hf isotopes and geochemistry
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摘要:
老牛山杂岩体位于华北地块南缘。野外侵入关系和锆石LA-ICP-MS U-Pb定年显示，其由晚三叠世(印支期)和晚侏罗(燕山期)花岗质岩石组成。印支期岩石类型为石英二长岩、石英闪长岩和粗粒黑云母二长花岗岩，年龄分别为223±1Ma、222±1Ma和214±1Ma； 燕山期为中粒-中粗粒黑云母二长花岗岩和细粒-中细粒黑云母二长花岗岩，年龄分别为152±1Ma和146±1Ma。印支期石英闪长岩、石英二长岩的SiO2相对含量低、富碱、高铝，为钾玄系列，准铝质Ⅰ型花岗岩；印支期粗粒黑云母二长花岗岩具富硅、碱、高铝、低镁的特点，属于高钾钙碱性系列，为准铝质-过铝质Ⅰ型花岗岩；燕山期黑云母二长花岗岩具高硅和铝、富碱，低镁的特点，为高钾钙碱性系列，准铝质Ⅰ型花岗岩。组成老牛山杂岩体的花岗岩从早到晚SiO2含量由低变高，MgO、CaO和Na2O由高变低。各期次岩石均表现出稀土元素总量较高，轻稀土元素明显富集，轻、重稀土元素分馏明显，具有较弱的铕异常。两期花岗质岩石均富集大离子亲石元素(K、Rb、Ba、Sr)，而相对亏损高场强元素(Nb、Ta、P)。印支期花岗质岩石的全岩εNd(t)为-11.3~-14.87，tDM为1.7~1.9Ga，锆石的εHf(t)为-9.57~-25.11，tDM2为1863~2841Ma；燕山期花岗岩的全岩εNd(t)为-13.32~-16.83，tDM为 1.7~1.9Ga，锆石的εHf(t)为-18.28~-24.79，tDM2 为2360~2767Ma，表明该杂岩体的源区物质以壳源物质为主，可能与太古宙太华群相似，印支期有年轻地幔物质贡献。
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关键词:
- 锆石U-Pb定年 /
- Sr-Nd-Hf同位素 /
- 物质源区 /
- 花岗质杂岩体 /
- 华北地块南缘
Abstract:The Laoniushan granitoid complex is located in the southern margin of North China Block. Field work and LA-ICP-MS zircon dating suggest that this complex consists of Late Triassic (Indosinian) and Late Jurassic (Yanshanian) granitoids. The rock types of the Indosinian granitoids are adamellite, quartz diorite and coarse-grained biotite monzogranite with ages of 223±1Ma, 223±1Ma and 214±1Ma, respectively. The Yanshanian granitoids are mid-coarse-grained, mid-grained biotite monzogranite and fine-grained biotite monzogranite with ages of 152±1Ma and 146Ma, respectively. The Indosinian adamellite and quartz diorite are low in SiO2 but rich in Al2O3 and Na2O+K2O, showing Shoshonite series and metaluminous I-type granite; coarse-grained biotite monzogranite are rich in SiO2, Al2O3 and Na2O+K2O, but poor in MgO with the features of high-K calc-alkalic series and metaluminous to peraluminous I-type granite. The Yanshanian biotite monzogranite with high SiO2, Al2O3 and Na2O+K2O also show the nature of high-K calc-alkalic series and metaluminous I-type granite. From Late Triassic to Late Jurassic SiO2 content of these granitoids increase, but MgO, CaO and Na2O decrease. The total REE contents of the granitoids are very high, especially LRRE, suggesting obvious LRRE and HRRE fractionation, and weakly negative Eu anomalies. The granitoids of Indosinian and Yanshanian are all rich in large ion lithophile elements (K, Rb, Ba, Sr), and relative depleted in high-field strength elements (Nb, Ta, P). The Indosinian granitoids with εNd(t)=-11.3~-14.87, tDM=1.7~1.9Ga, εHf(t)=-9.57~-25.11，tDM2=1863~2841Ma, and the Yanshanian εNd(t)=-13.32~-16.83, tDM=1.7~1.9Ga, εHf(t)=-18.28~-24.79, tDM2=2360~2767Ma, indicate that their sources are dominated by old crust component related to the Archaean Taihua Group and the sources of the Indosinian granitoids is with more juvenile component contributed.
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图 1
秦岭造山带构造简图及中生代花岗岩体分布(a, 底图据Ding et al., 2011修改)和华北地块南缘老牛山岩体地质图(b,六分队, 1966①)
Figure 1.
Sketch tectonic map of the Qinling orogen and distribution of the Mesozoic granitoids (a, after Ding et al., 2011) and geological map of the Laoniushan complex in southern margin of North China Block (b)
图 2
粗粒黑云母二长花岗岩被中粗粒黑云母二长花岗岩包裹(a)和石英闪长岩被细粒花岗岩包裹(b)
Figure 2.
Coarse-grained biotite monzogranite in the coarse-grained biotite monzogranite (a) and fine-grained granite in the quartz diorite (b)
图 4
老牛山杂岩体锆石CL图像
Figure 4.
Cathodeluminescence (CL) images of zircons from the Laoniushan complex
图 5
老牛山杂岩体锆石LA-ICP-MS U-Pb年龄谐和图
Figure 5.
Concordia diagram of LA-ICP-MS U-Pb zircon analyses from the Laoniushan complex
图 6
K2O-SiO2岩石系列判别图(底图据Rollinson, 1993)
Figure 6.
K2O-SiO2 diagram for the Laoniushan complex (after Rollinson, 1993)
图 7
岩石铝饱和指数判别图解(底图据Rollinson，1993)
Figure 7.
ACNK-ANK diagram for the Laoniushan complex (after Rollinson, 1993)
图 8
老牛山杂岩体印支期花岗岩类(a)和燕山期黑云母二长花岗岩(b)球粒陨石标准化图(球粒陨石标准化值据Sun and McDonough, 1989)
Figure 8.
Chondrite-normalized REE patterns of Indo-Chinese Epoch granites (a) and Yanshan Period granites (b) (normalization values after Sun and McDonough, 1989)
图 9
老牛山杂岩体印支期花岗岩类(a)和燕山期花岗岩类(b)原始地幔标准化蛛网图(原始地幔标准值据Sun and McDonough, 1989)
Figure 9.
Primitive mantle-normalized trace element spidergrams of Indo-Chinese Epoch granites (a) and Yanshan Period granites (b) (normalization values after Sun and McDonough, 1989)
图 10
老牛山杂岩体I、A型成因类型图解(据Collis，1982)
Figure 10.
SiO2-Ce diagram for the Laoniushan complex (after Collis, 1982)
图 11
老牛山杂岩体εNd(t)-t和εNd(t)-ISr同位素图解
Figure 11.
Diagram of εNd(t)-t and εNd(t)-ISr for granites from the Laoniushan complex
图 12
老牛山杂岩体锆石地壳模式年龄(tDM2)和εHf(t)柱状图
Figure 12.
Zircon tDM2 and Hf isotopic compositions of the granites from the Laoniushan complex
图 13
老牛山杂岩体的εHf(t)-t和176Hf/177Hf-t图解
Figure 13.
Diagrams of εHf(t)-t and 176Hf/177Hf-t of granites for the Laoniushan complex
图 14
金堆城花岗斑岩和老牛山花岗岩的稀土元素球粒陨石标准化曲线(a)和微量元素原始地幔标准化蛛网图 (b) (标准值据Sun and McDonough, 1989)
Figure 14.
Chondrite-normalized REE patterns (a) and primitive mantle-normalized trace element spidergrams (b) for granites of the Laoniushan complex and granite porphyry of the Jinduicheng pluton (normalization values after Sun and McDonough, 1989)
表 1
老牛山杂岩体主要岩石类型的特征
Table 1.
Characteristics of the major rock types of the Laoniushan complex
期次 岩石名称 岩石结构 主要及次要矿物百分含量(%) 副矿物 钾长石 斜长石 石英 黑云母 角闪石 印支期 石英二长岩 中细粒结构 20~35 40~55
An=37~435~10 10~20 磷灰石、榍石、
磁铁矿、锆石石英闪长岩 中细粒半自形
粒状结构20~30 30~45
An=22~305~10 ＜8 5~10 榍石、磷灰石、
磁铁矿、锆石粗粒黑云母
二长花岗岩粗粒花岗结构
似斑状结构20~35 30~40
An=29~3522~27 10~20 榍石、磷灰石、
磁铁矿、锆石燕山期 中粒-中粗粒
黑云母二长
花岗岩中粒-中粗粒花岗
结构似斑状结构25~30 35~45
An=30~3520~25 10~15 榍石、磷灰石、
磁铁矿、锆石细粒-中细粒
黑云母二长
花岗岩细粒-中细粒
花岗结构25~35 25~40
An=15~2020~25 约5 磷灰石、锆石、
榍石、磁铁矿
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表 2
老牛山杂岩体锆石LA-ICP-MS U-Pb测试结果
Table 2.
LA-ICP-MS U-Pb zircon analytical results for the Laoniushan complex
测点号 含量(×10-6) Th/U 同位素比值(±1σ) 年龄(Ma)±1σ Pb Th U 207Pb/206Pb 207Pb/235U 206Pb/238U 207Pb/206Pb 207Pb/235U 206Pb/238U 石英二长岩(LN-11/B1) LN-11/B1-1 159.6 100.8 473.8 0.21 0.13705±0.00028 7.02333±0.06452 0.36081±0.00333 2190±4 2114±8 1986±16 LN-11/B1-2 10.2 201.9 209.7 0.96 0.05023±0.00042 0.25482±0.00277 0.03581±0.00034 206±23 230±2 227±2 LN-11/B1-3 16.8 315.8 260.4 1.21 0.05088±0.00080 0.25648±0.00517 0.03534±0.00028 235±37 232±4 224±2 LN-11/B1-4 10.8 191.3 226.1 0.85 0.04833±0.00033 0.2438±0.00267 0.03551±0.0003 122±17 222±2 225±2 LN-11/B1-5 14.7 217.0 252.5 0.86 0.05237±0.00046 0.26295±0.00259 0.03546±0.00029 302±20 237±2 225±2 LN-11/B1-7 6.0 134.8 157.9 0.85 0.04798±0.00040 0.23849±0.00239 0.03503±0.00025 98±19 217±2 222±2 LN-11/B1-8 9.0 129.9 137.1 0.95 0.04802±0.00060 0.23798±0.00306 0.03499±0.00032 102±25 217±3 222±2 LN-11/B1-11 15.5 373.6 249.7 1.50 0.050791±0.00100 0.24909±0.00551 0.03455±0.00049 232±46 226±4 219±3 LN-11/B1-12 85.9 100.5 241.4 0.42 0.12436±0.00027 5.78853±0.03604 0.32782±0.00202 2020±8 1945±5 1828±10 LN-11/B1-13 7.0 138.8 140.0 0.99 0.04894±0.00053 0.24368±0.00273 0.03511±0.00021 146±24 221±2 222±1 LN-11/B1-14 11.6 227.8 229.7 0.99 0.04879±0.00034 0.24617±0.00204 0.0356±0.00025 200±17 223±2 226±2 LN-11/B1-15 8.6 183.5 183.1 1.00 0.04835±0.00043 0.24083±0.00269 0.0351±0.00028 117±53 219±2 222±2 LN-11/B1-16 10.3 212.3 205.2 1.03 0.04875±0.00039 0.24498±0.00265 0.03547±0.00034 200±19 222±2 225±2 LN-11/B1-17 11.3 210.7 230.3 0.91 0.04862±0.00040 0.24324±0.00312 0.03527±0.00039 128±20 221±3 223±2 LN-11/B1-19 6.9 125.2 174.4 0.72 0.04832±0.00042 0.2427±0.00285 0.03544±0.00035 122±53 221±2 224±2 LN-11/B1-20 13.7 268.6 239.3 1.12 0.04817±0.00040 0.23945±0.00209 0.03503±0.00018 109±20 218±2 222±1 石英闪长岩(LN-12/B1) LN-12/B1-1 40.2 246.4 231.7 1.06 0.048496±0.00031 0.24185±0.00219 0.03511±0.00024 124±15 220±2 222±1 LN-12/B1-2 42.5 185.2 205.5 0.90 0.04847±0.00037 0.2404±0.00224 0.035±0.00029 120±17 219±2 222±2 LN-12/B1-4 40.3 124.7 142.6 0.87 0.04924±0.00043 0.24604±0.00246 0.03528±0.00029 167±25 223±2 224±2 LN-12/B1-5 79.4 1551 696.8 2.23 0.05026±0.00018 0.25268±0.00245 0.03541±0.00034 206±10 229±2 224±2 LN-12/B1-6 23.9 241.9 250.8 0.96 0.04873±0.00030 0.24426±0.00238 0.0353±0.00029 200±15 222±2 224±2 LN-12/B1-7 32.2 303.9 264.6 1.15 0.04894±0.00031 0.24331±0.00237 0.03502±0.00029 146±18 221±2 222±2 LN-12/B1-8 23.8 231.0 266.5 0.87 0.04947±0.00030 0.24836±0.00247 0.03536±0.0003 169±15 225±2 224±2 LN-12/B1-9 19.7 136.8 179.6 0.76 0.04893±0.00035 0.24443±0.00241 0.03522±0.0003 143±17 222±2 223±2 LN-12/B1-10 34.8 227.2 218.5 1.04 0.048570±0.00033 0.24194±0.00245 0.03511±0.00031 128±17 220±2 222±2 LN-12/B1-11 7.6 142.6 135.5 1.05 0.04933±0.00076 0.24704±0.00418 0.03529±0.0003 165±35 224±3 224±2 LN-12/B1-12 5.8 120.3 126.6 0.95 0.04990±0.00069 0.24336±0.00402 0.0349±0.00034 154±31 221±3 221±2 LN-12/B1-13 7.1 175.9 143.9 1.22 0.04812±0.00053 0.23948±0.00305 0.03504±0.00025 106±26 218±2 222±2 LN-12/B1-14 8.8 210.7 167.3 1.26 0.04874±0.00051 0.24134±0.00275 0.03489±0.00025 200±29 220±2 221±2 LN-12/B1-15 6.1 121.6 109.5 1.11 0.04842±0.00055 0.2411±0.00291 0.03509±0.00023 120±23 219±2 222±1 LN-12/B1-17 44.0 157.5 145.2 1.08 0.04796±0.00045 0.2403±0.00267 0.03532±0.00028 98±22 219±2 224±2 LN-12/B1-18 35.7 425.2 243.6 1.75 0.049069±0.00039 0.24395±0.00286 0.035±0.00032 150±19 222±2 222±2 LN-12/B1-19 51.0 140.9 163.9 0.86 0.04803±0.00043 0.24085±0.0029 0.03528±0.00028 102±20 219±2 224±2 LN-12/B1-20 16.5 168.7 184.3 0.92 0.04798±0.00033 0.24109±0.00263 0.0354±0.00033 98±19 219±2 224±2 粗粒黑云母二长花岗岩(LN-18/B1) LN-18/B1-1 51.1 756.7 1745.2 0.43 0.05086±0.00015 0.23912±0.00135 0.03410±0.00016 235±7 218±1 217±1 LN-18/B1-2 33.9 498.8 1251.0 0.40 0.05084±0.00015 0.23553±0.00128 0.03361±0.00015 232±3 215±1 213±1 LN-18/B1-4 38.6 729.1 874.4 0.83 0.05032±0.00019 0.23363±0.00125 0.03369±0.00014 209±3 213±1 214±1 LN-18/B1-5 56.3 996.4 1456.9 0.68 0.05056±0.00015 0.23511±0.00117 0.03374±0.00015 220±7 214±1 214±1 LN-18/B1-6 35.6 485.4 1229.7 0.39 0.05060±0.00027 0.23339±0.00173 0.03347±0.00021 233±13 213±1 212±1 LN-18/B1-7 35.5 493.3 1193.1 0.41 0.05081±0.00018 0.23660±0.00147 0.03378±0.00018 232±3 216±1 214±1 LN-18/B1-8 49.8 652.6 1820.6 0.36 0.05090±0.00015 0.23481±0.00144 0.03346±0.00018 235±7 214±1 212±1 LN-18/B1-9 54.2 795.2 1690.1 0.47 0.05107±0.00020 0.23708±0.00139 0.03368±0.00017 243±9 216±1 214±1 LN-18/B1-10 34.0 500.9 1162.9 0.43 0.05101±0.00020 0.23597±0.00135 0.03355±0.00014 243±9 215±1 213±1 LN-18/B1-11 53.4 1023 1196.3 0.85 0.05045±0.00016 0.23755±0.00252 0.03413±0.00033 217±12 216±2 216±2 LN-18/B1-12 65.9 981.8 2139.8 0.46 0.05104±0.00014 0.23962±0.00259 0.03408±0.00038 243±10 218±2 216±2 LN-18/B1-13 60.9 876.0 2101.4 0.42 0.05131±0.00014 0.24042±0.00266 0.03398±0.00037 254±3 219±2 215±2 LN-18/B1-14 58.9 866.5 1958.9 0.44 0.05140±0.00014 0.24024±0.00209 0.03390±0.00028 257±6 210±2 215±2 LN-18/B1-15 64.0 803.5 2333.3 0.34 0.05219±0.00013 0.24550±0.00144 0.03412±0.00019 295±6 223±1 216±1 LN-18/B1-16 70.5 865.2 2394.4 0.36 0.05339±0.00019 0.25164±0.00094 0.03424±0.00016 346±5 228±1 217±1 LN-18/B1-17 57.5 844.4 1852.1 0.46 0.05117±0.00013 0.24111±0.00152 0.03417±0.00019 256±6 219±1 217±1 LN-18/B1-18 66.5 1167 1755.1 0.67 0.05096±0.00014 0.23920±0.00133 0.03404±0.00017 239±12 218±1 216±1 LN-18/B1-19 58.69 892.9 1936.6 0.46 0.05099±0.00015 0.23689±0.00122 0.03370±0.00015 239±10 216±1 214±1 LN-18/B1-20 101.7 1565 3095.0 0.51 0.05118±0.00012 0.238108±0.00130 0.03374±0.00016 250±6 217±1 214±1 中粒黑云母二长花岗岩(LN-05) LN-05-1 5.7 121.9 296.9 0.41 0.04689±0.00037 0.16151±0.0019 0.02382±0.00024 43±14 152±2 152±1 LN-05-2 4.8 116.1 252.2 0.46 0.04689±0.00038 0.16165±0.00204 0.02395±0.00024 32±20 152±2 153±1 LN-05-4 10.3 232.4 434.5 0.53 0.04689±0.00039 0.1644±0.00198 0.02364±0.00026 102±15 155±2 151±2 LN-05-5 4.9 77.5 177.6 0.44 0.04689±0.00040 0.16416±0.00217 0.02382±0.00025 83±24 154±2 152±2 LN-05-6 16.2 391.1 586.8 0.67 0.04689±0.00041 0.1696±0.00259 0.02349±0.00038 191±19 159±2 150±2 LN-05-7 6.9 186.6 385.9 0.48 0.04689±0.00042 0.16552±0.00171 0.02379±0.00021 102±15 156±1 152±1 LN-05-8 7.7 217.7 307.2 0.71 0.04689±0.00043 0.16209±0.00173 0.02365±0.00024 72±23 153±2 151±2 LN-05-9 3.6 72.1 118.7 0.61 0.04689±0.00044 0.1624±0.00295 0.02409±0.00021 33±31 153±3 153±1 LN-05-10 7.3 132.4 452.9 0.29 0.04689±0.00045 0.16123±0.00142 0.0237±0.00016 56±13 152±1 151±1 LN-05-11 5.6 160.8 255.4 0.63 0.04689±0.00046 0.16116±0.00158 0.02372±0.00013 56±22 152±1 151±1 LN-05-12 6.6 165.1 271.6 0.61 0.04689±0.00047 0.16439±0.00175 0.02408±0.00017 58±20 155±2 153±1 LN-05-13 5.6 180.5 185.1 0.98 0.04689±0.00048 0.16176±0.002 0.02372±0.00017 58±28 152±2 151±1 LN-05-14 3.6 68.0 167.8 0.41 0.04689±0.00049 0.16274±0.00188 0.02395±0.00015 56±21 153±2 153±1 LN-05-15 6.7 136.7 386.0 0.35 0.04689±0.00050 0.16484±0.00145 0.02371±0.00015 102±17 155±1 151±1 LN-05-17 8.3 149.7 527.4 0.28 0.04689±0.00051 0.16489±0.00116 0.02369±0.00011 106±10 155±1 151±1 LN-05-18 7.9 189.9 421.6 0.45 0.04689±0.00052 0.16524±0.0017 0.02376±0.00013 102±20 155±1 151±1 LN-05-19 5.0 136.9 278.9 0.49 0.04689±0.00053 0.16435±0.00131 0.02388±0.00012 76±17 155±1 152±1 LN-05-20 22.2 659.2 614.3 1.07 0.04689±0.00054 0.1664±0.00153 0.02394±0.00019 102±18 156±1 153±1
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表 3
老牛山岩体主量元素(wt%)、稀土和微量元素(×10-6)测试结果
Table 3.
Major elements (wt%), trace elements (×10-6) results of the Laoniushan complex
期次 印支期 燕山期 岩性 石英二长岩 石英闪长岩 粗粒似斑状黑云母二长花岗岩 中粒-中粗粒似斑状黑云母二长花岗岩 细粒-中细粒黑云母二长花岗岩 黑云母二长花岗岩 样品号 LN-11/B1 LN-20/B1 LN-35/B1 LN-12/B1 LN-23/B1 LN-24/B1 LN-25/B1 LN-04 LN-07 LN-18/B1 LN-29/B1 LN-30/B1 LN-02 LN-05 LN-15/B2 LN-09 LN-44/B1 M0602(a) M0616(a) LNS02(d) LNS03(d) LNS16(d) 8401(c) 8402(c) 8403(c) SiO2 64.44 63.58 59.84 61.24 59.54 61.31 60.43 68.38 70.89 70.11 70.63 67.76 66.72 66.60 67.46 65.31 72.56 71.49 70.31 69.38 71.03 73.05 TiO2 0.38 0.25 0.61 0.49 0.57 0.51 0.50 0.34 0.31 0.15 0.19 0.38 0.35 0.44 0.27 0.50 0.09 0.13 0.16 0.31 0.26 0.14 Al2O3 16.43 19.07 18.16 16.11 16.46 16.36 16.34 16.40 14.84 16.39 15.84 16.45 16.94 16.45 16.64 16.88 15.26 15.80 16.25 14.87 14.35 13.91 Fe2OT3 3.67 2.64 6.03 5.10 5.78 5.08 5.38 2.91 2.72 1.58 1.60 3.05 3.24 3.76 2.91 4.47 0.94 1.56 1.83 2.87 2.52 1.54 MnO 0.08 0.05 0.14 0.10 0.12 0.10 0.11 0.07 0.09 0.04 0.04 0.06 0.09 0.11 0.06 0.11 0.06 0.07 0.08 0.08 0.07 0.08 MgO 1.55 0.73 1.80 2.42 2.58 2.28 2.57 0.86 0.83 0.48 0.45 0.99 0.92 1.03 0.98 1.23 0.12 0.26 0.30 0.70 0.58 0.41 CaO 3.18 2.46 5.63 4.17 4.47 4.10 4.43 3.08 2.70 1.42 1.97 3.22 3.50 3.12 2.35 4.45 1.08 1.51 1.62 2.01 1.77 1.70 Na2O 4.29 5.70 4.20 4.21 4.26 4.12 4.22 3.77 3.78 5.08 3.71 4.06 3.94 3.83 4.98 3.66 4.52 4.13 4.17 4.40 3.95 3.47 K2O 5.63 5.37 3.18 5.66 5.57 5.58 5.42 4.01 3.67 4.68 5.47 3.84 4.11 4.44 4.13 3.10 5.35 5.01 4.44 4.32 4.37 4.55 P2O5 0.34 0.14 0.39 0.47 0.61 0.54 0.57 0.17 0.17 0.06 0.09 0.18 0.18 0.21 0.20 0.27 0.02 0.05 0.06 0.13 0.03 0.05 LOI 0.90 0.50 0.60 0.80 0.80 0.60 0.60 1.00 0.80 0.50 0.50 0.60 0.60 0.90 0.40 0.90 0.40 0.32 0.60 0.51 4.64 Sum 99.39 98.89 99.50 99.24 99.23 99.24 99.23 99.74 99.81 99.53 99.80 99.69 99.70 99.70 99.43 99.71 99.45 100.33 99.82 99.48 100.43 99.53 Mg﹟ 0.51 0.43 0.30 0.52 0.51 0.51 0.50 0.41 0.40 0.43 0.53 0.38 0.40 0.44 0.39 0.32 0.51 0.25 0.25 0.33 0.31 0.35 A/NK 1.25 1.26 1.76 1.23 1.26 1.28 1.28 1.56 1.46 1.22 1.32 1.52 1.55 1.48 1.31 1.80 1.15 1.29 1.39 1.25 1.28 1.31 A/CNK 0.87 0.97 0.88 0.78 0.78 0.81 0.78 1.02 0.98 1.02 1.02 0.99 0.98 0.98 0.98 0.97 1.01 1.06 1.11 0.95 0.99 1.01 Na2O+K2O 9.91 11.07 7.37 9.87 9.83 9.69 9.63 7.78 7.44 9.76 9.17 7.90 8.04 8.27 9.11 6.76 9.87 9.14 8.61 8.72 8.32 8.02 K2O/Na2O 1.31 0.94 0.76 1.35 1.31 1.35 1.28 1.06 0.97 0.92 1.48 0.95 1.04 1.16 0.83 0.85 1.18 1.21 1.06 0.98 1.11 1.31 CaO/Na2O 0.74 0.43 1.34 0.99 1.05 1.00 1.05 0.82 0.71 0.28 0.53 0.79 0.89 0.81 0.47 1.22 0.24 0.37 0.39 0.46 0.45 0.49 Al2O3/TiO2 43.73 75.04 29.93 33.02 28.93 32.28 32.88 47.62 47.39 108.20 82.79 42.89 47.97 37.81 61.04 34.04 169.60 121.54 101.56 47.97 55.19 99.36 Ba 3285 6407 2122 3900 4120 4127 4099 1391 975 2704 1241 1611 1644 1574 1235 3153 809 2085 2407 1536 2061 2539 Rb 138 95.8 76.1 117 113 116 89.6 126 146 103 203 121 165 172 105 99.5 132 238 182 198 221 194 Sr 1429 2691 1419 1889 1755 1745 1805 665 520 1264 491 742 697 665 818 1436 428 653 1006 562 710 1016 Y 16.1 14.9 26.1 17.8 20.6 18.3 19.1 10.2 9.8 7.3 6.6 11.1 12.6 12.9 17.3 9.5 11.2 15.9 15.2 20.2 17 18.6 Zr 243 337 281 337 290 271 262 156 145 159 119 173 147 179 208 199 124 190 230 217 168 232 Nb 35.8 37.7 44.1 36.3 42.6 38.3 40.9 13.1 14.6 13.2 12.6 14.3 14.9 15.9 16.4 14.0 14.3 31.24 34.99 30.5 33.7 27.3 Th 0.57 0.50 0.93 0.62 0.72 0.67 0.70 12.4 9.7 43.8 10.1 12.2 13.9 13.5 12.8 18.0 17.4 21.17 18.7 27.2 17.15 20.76 U 3.5 2.7 1.7 3.0 1.7 1.9 1.9 2.0 4.7 3.8 2.7 2.1 2.6 2.5 1.9 2.4 1.9 9.54 1.97 6.88 10.45 3.03 Pb 42.4 22.5 5.0 23.5 20.4 14.8 16.1 5.2 8.3 21.0 9.0 4.0 6.5 6.5 3.6 24.7 12.8 42.1 40.5 44.1 47.48 48.7 Ni 6.9 2.2 1.6 8.4 7.2 7.5 7.2 2.4 2.2 3.8 1.4 3.2 1.4 2.2 1.8 3.2 0.2 2 2 2.17 0.53 1.01 V 55 42 81 91 113 96 89 26 30 19 19 41 32 38 47 35 ＜8 14.8 13.5 10.82 9.03 9.2 Hf 6.6 8.2 6.5 8.3 6.8 6.7 7.8 4.6 4.6 4.7 3.6 5.0 4.3 5.3 5.5 5.7 4.8 8.23 9.3 6.1 4.69 5.9 Ta 1.3 1.1 1.4 0.7 0.6 0.6 0.6 1.2 1.2 1.0 1.0 1.1 1.1 1.4 1.1 1.1 1.1 2.68 1.81 2.6 2.42 1.79 Co 8.0 3.8 8.9 12.1 12.7 10.8 12.5 3.9 4.0 1.9 2.5 5.4 4.3 4.3 6.1 4.7 183 141 164 120 138 Cs 2.8 2.6 1.6 1.5 1.6 1.9 0.9 3.2 5.3 1.2 4.3 2.8 10.2 4.3 1.4 4.3 ＜1 4.15 2.57 5.85 4.11 2.89 La 56.8 86.0 50.8 54.0 56.3 47.7 51.8 32.5 25.4 38.4 18.3 38.0 34.8 40.8 51.1 44.7 17.5 43.07 45.54 67.3 49.43 59.07 Ce 106.5 142.5 112.3 106.3 112.6 95.3 104.1 67.6 53.0 64.6 35.1 76.2 69.7 80.7 100.3 83.6 34.6 78.22 94.78 119.7 87.89 117.3 Pr 10.28 12.50 11.85 10.43 11.96 10.37 10.83 6.66 5.44 5.61 3.70 7.74 7.17 8.25 9.81 7.51 3.18 9.02 9.96 12.09 8.91 11.02 Nd 35.8 37.7 44.1 36.3 42.6 38.3 40.9 22.6 20.2 17.4 12.4 27.1 25.2 27.6 34.2 25.0 10.0 31.24 34.99 42.21 31.84 38.69 Sm 5.64 5.10 7.85 6.02 6.88 6.35 6.57 3.84 3.35 2.50 2.08 3.95 3.56 4.62 5.35 3.56 1.80 4.82 5.2 6.68 5.07 5.97 Eu 1.34 1.34 2.01 1.56 1.81 1.64 1.73 1.04 0.86 0.68 0.55 1.12 1.05 1.17 1.45 1.03 0.41 1.00 1.16 1.16 1.13 1.36 Gd 3.61 2.89 5.63 4.06 5.01 4.58 4.61 2.71 2.33 1.50 1.37 2.84 2.64 3.17 3.64 2.38 1.42 3.46 3.55 5.16 3.95 4.5 Tb 0.57 0.50 0.93 0.62 0.72 0.67 0.70 0.40 0.35 0.24 0.21 0.41 0.42 0.48 0.57 0.35 0.28 0.56 0.57 0.66 0.52 0.58 Dy 2.90 2.48 4.84 3.06 3.76 3.34 3.50 2.01 1.72 1.18 1.11 1.99 2.23 2.31 2.98 1.84 1.57 2.86 2.95 3.5 2.81 3.2 Ho 0.57 0.49 0.93 0.60 0.74 0.64 0.68 0.36 0.35 0.25 0.19 0.36 0.39 0.45 0.61 0.38 0.36 0.52 0.52 0.66 0.56 0.64 Er 1.63 1.23 2.58 1.68 2.06 1.85 1.99 0.96 0.95 0.71 0.62 1.00 1.25 1.24 1.73 1.01 1.11 1.55 1.48 1.8 1.55 1.77 Tm 0.24 0.20 0.37 0.24 0.30 0.28 0.29 0.15 0.14 0.12 0.10 0.16 0.18 0.19 0.25 0.15 0.18 0.26 0.24 0.27 0.25 0.27 Yb 1.63 1.30 2.39 1.78 1.89 1.67 1.76 1.00 0.99 0.81 0.64 0.96 1.25 1.23 1.63 1.03 1.28 1.77 1.47 1.84 1.73 1.82 Lu 0.25 0.20 0.36 0.27 0.31 0.28 0.28 0.17 0.16 0.13 0.13 0.16 0.22 0.21 0.27 0.17 0.21 0.3 0.23 0.28 0.27 0.28 ΣREE 227.8 294.4 246.9 226.9 246.9 213.0 229.7 142.0 115.2 134.1 76.5 162.0 150.1 172.4 213. 9 172.7 73.9 178.7 202.6 263.3 195.9 246. 5 LREE 216.4 285.1 228.9 214.6 232.2 199.7 215.9 134.2 108.3 129.2 72.13 154.1 141.5 163.1 202.2 165.4 67.49 167.4 191.6 249.1 184.3 233.4 HREE 11.4 9.29 18.03 12.31 14.79 13.31 13.81 7.76 6.99 4.94 4.37 7.88 8.58 9.28 11.68 7.31 6.41 11.28 11.01 14.17 11.64 13.06 LREE/HREE 18.98 30.69 12.70 17.43 15.70 15.00 15.64 17.30 15.49 26.15 16.51 19.56 16.49 17.58 17.31 22.63 10.53 14.84 17.41 17.58 15.83 17.87 (La/Yb)N 25.00 47.45 15.25 21.76 21.37 20.49 21.11 23.31 18.40 34.01 20.51 28.39 19.97 23.79 22.49 31.13 9.81 17.45 22.22 26.24 20.49 23.28 δEu 0.85 0.97 0.88 0.91 0.90 0.89 0.91 0.94 0.89 0.99 0.94 0.97 0.88 0.95 1.02 0.76 0.71 0.78 0.58 0.74 0.71 0.77 δCe 1.00 0.94 1.08 1.03 1.01 1.00 1.02 1.07 1.05 0.95 0.99 1.03 34.12 33.68 37.89 34.91 25.85 23.09 24.73 35.57 35.82 39.32
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表 4
老牛山杂岩体Rb-Sr、Sm-Nd同位素测试结果
Table 4.
Rb-Sr,Sm-Nd isotopic results of the Laoniushan complex
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表 5
老牛山杂岩体中锆石HF同位素分析结果
Table 5.
Lu-Hf isotopic data of zircons from the Laoniushan complex
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