Petrogenesis and implications of the Dupangling compound granite in southern Hunan Province, China: Constraints from mineralogical chemistry, zircon U-Pb age, geochemistry and Nd-Hf isotope
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摘要: 文章对位于南岭西段湘桂交界处的都庞岭东侧岩体开展了锆石SHRIMP U-Pb年代学、岩石学、矿物化学、岩石地球化学和Sm-Nd、Lu-Hf同位素分析研究。锆石SHRIMP U-Pb定年结果显示，粗中粒斑状黑云母二长花岗岩年龄为215.6±2.1 Ma，中粒斑状黑云母二长花岗岩年龄为220.5±1.8 Ma，中粒环斑黑云母二长花岗岩年龄为222.8±1.5 Ma，结合以往研究获得的细粒白云母二长花岗岩年龄209.7±3.1 Ma，认为岩体侵位时限介于222.8~209.7 Ma，为印支期岩浆活动产物，非以往认为的燕山期。环斑钾长石、黑云母聚晶的矿物化学特征表明环斑黑云母二长花岗岩形成过程中岩浆温度、压力、成分发生震荡变化，在玄武质岩浆的底侵作用下发生多次熔融作用形成黑云母聚晶。都庞岭黑云母二长花岗岩具有较高的SiO2和K2O+Na2O含量，A/CNK值为1.02~1.39，里特曼指数(δ)为0.93~2.18，属过铝质钙碱性系列；微量元素地球化学性质表现为富集REE、Rb、Th和U及较高的HFSE(Nb、Y和Ga)，亏损Ba、Sr、Eu，具有高的TFeO/MgO、Ga/Al比值，地球化学特征显示为A型花岗岩；Nd同位素εNd(t)值为-8.74~-8.13，T2DM值为1.71~1.66 Ga；锆石Hf同位素εHf(t)值为-14.1~-1.4，T2DM值为2.14~1.34 Ga，显示都庞岭黑云母二长花岗岩主要源于古老地壳物质的部分熔融，并受到了一定程度的亏损地幔物质的混染。印支运动的变质峰期在258~243 Ma，233 Ma以后华南地区处于伸展的构造背景并受到幔源玄武质岩浆大范围底侵，诱发地壳物质重熔形成伸展背景下的都庞岭印支期铝质A型(环斑)花岗岩。Abstract: In this paper, zircon SHRIMP U-Pb geochronology, petrology, mineral chemistry, petrogeochemistry, Sm-Nd and Lu-Hf isotopes were studied for the eastern part of the Dupangling pluton, which is located at the western section of Nanling at the junction of Hunan and Guangxi provinces. The zircon SHRIMP U-Pb dating results show that the age of coarse-to-medium-grained porphyritic biotite monzogranite is 215.6±2.1 Ma, medium-grained porphyritic biotite monzogranite 220.5±1.8 Ma, medium-grained rapakivi biotite monzogranite 222.8±1.5 Ma. Combined with the age of fine-grained muscovite monzogranite as 209.7±3.1 Ma obtained in the previous research, it is suggested that the emplacement time ranges from 222.8 Ma to 209.7 Ma, and the pluton is derived from the Indosinian magmatic activity rather than the Yanshanian as previously thought. The mineral-chemical characteristics of rapakivi K-feldspar and biotite phenocryst indicate that the magma temperature, pressure and composition have gone through fluctuation during the formation process, and biotite phenocryst was formed by multiple melting under the underplating by basaltic magma in this area. The Dupangling biotite monzogranites have higher contents of SiO2 and K2O+Na2O, A/CNK value ranges between 1.02 and 1.39 and Rittman index (δ) between 0.93 and 2.18, belonging to the peraluminous calc-alkaline. Moreover, these monzogranites are enriched in REE, Rb, Th and U with higher content of HFSE (Nb, Y and Ga), depleted in Ba, Sr and Eu with higher ratios of TFeO/MgO and Ga/Al, showing the characterisitics of A-type granite. The isotope εNd(t) value ranges from -8.74 to -8.13, and the T2DM value from 1.71 to 1.66 Ga; the zircon isotope εHf(t) value ranges from -14.1 to -1.4, and the T2DM value from 2.14 to 1.34 Ga. It reveals that the Dupangling biotite monzogranites mainly originated from the partial melting of ancient crustal materials and were mixed with a certain degree of depleted mantle materials. The metamorphic peak period of the Indosinian movement is from 258 Ma to 243 Ma. South China was in an extensional tectonic setting after 233 Ma and mantle-derived basalt magma was in a wide range of underplating, which caused the crustal material remelting to form the Dupangling Indosinian aluminous A-type granite (rapakiwi granite) under an extensional background.
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Key words:
- Dupangling pluton /
- rapakiwi granite /
- SHRIMP U-Pb age /
- mineral chemistry /
- A-type granite /
- extensional setting
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图 1 湘南都庞岭岩体所处大地构造位置及都庞岭岩体地质简图(据徐德明等，2017修改)
1—志留纪花岗闪长岩；2—志留纪二长花岗岩；3—印支期粗中粒斑状黑云母二长花岗岩；4—印支期中粒斑状黑云母二长花岗岩；5—印支期中粒环斑黑云母花岗岩；6—燕山期中粒斑状黑云母二长花岗岩；7—寒武系；8—奥陶系；9—泥盆系；10—石炭系；11—白垩系；12—第四系；13—同位素年龄点(D0056、D0059和D0070-1)；14—样品采样位置；15—角岩化带；16—地质界线；17—断裂；18—角度不整合界线
a—都庞岭岩体大地构造位置；b—都庞岭岩体地质简图Figure 1. Tectonic position and geological sketch of the Dupangling pluton in the south of Hunan(modified from Xu et al., 2017)
(a) Tectonic position; (b) Geological sketch
1-Silurian granodiorite; 2-Silurian monzogranite; 3-Indosinian coarse-to-medium-grained porphyritic biotite monzogranite; 4-Indosinian medium-grained porphyritic biotite monzogranite; 5-Indosinian medium-grained rapakivi biotite syenogranite; 6-Yanshanian medium-grained porphyritic biotite monzogranite; 7-Cambrian system; 8-Ordovician system; 9-Devonian system; 10-Carboniferous system; 11-Cretaceous system; 12-Quaternary system; 13-Sample locations for isotopic age analysis (D0056, D0059, and D0070-1); 14-Sample locations; 15-Hornfelsic zones; 16-Geologic boundary; 17-Fracture; 18-Angular unconformity boundary
图 2 都庞岭黑云母二长花岗岩、黑云母斑晶集合体岩石学特征
a—灰白色粗中粒斑状黑云母二长花岗岩(斑晶含量约15%)；b—中粒斑状黑云母二长花岗岩与粗中粒斑状黑云母二长花岗岩呈脉动接触；c—中粒斑状黑云母二长花岗岩(黑云母含量较低)；d—灰白色中粒环斑黑云母二长花岗岩中环斑晶含量约20%(钾长石环斑呈卵球状)；e—中粒环斑黑云母二长花岗岩中发育的环斑钾长石见斜长石环边; f—中粒环斑黑云母二长花岗岩中钾长石见震荡环带(背散射图像)；g—粗中粒斑状黑云母二长花岗岩中见黑云母斑晶集合体；h—粗中粒斑状黑云母二长花岗岩中见黑云母斑晶呈不均匀特征(局部含量达45%)；i—黑云母斑晶中见石英、绢云母等细小矿物(背散射图像)
Figure 2. Petrological characteristics of the Dupangling biotite monzogranite and biotite phenocryst aggregate
(a) Gray-white coarse-to-medium-grained porphyritic biotite monzogranite (Phenocryst content is about 15%); (b) Pulsating contact between medium-grained porphyritic biotite monzogranite and coarse-to-medium-grained porphyritic biotite monzogranite; (c) Characteristics of medium-grained porphyritic biotite monzogranite (Biotite content is low); (d) Phenocryst content is about 20% in gray-white medium-grained rapakivi biotite monzogranite (The rapakivi texture of potassium feldspar is ovoid); (e) Rapakivi potassium feldspar with medium-grained marginal ring plagioclase developed in the medium-grained rapakivi biotite monzogranite; (f) Back-scattered electron image of potassium feldspar with oscillatory zoning in the medium-grained rapakivi biotite monzogranite; (g) Biotite phenocryst aggregates in coarse-to-medium-grained porphyritic biotite monzogranite; (h) Biotite phenocryst with heterogeneous characteristics in coarse-to-medium-grained porphyritic biotite monzogranite (Local content is up to 45%); (i) Back-scattered electron image of fine minerals such as quartz and sericite in biotite phenocryst
图 3 都庞岭中粒环斑黑云母二长花岗岩中钾长石成分变化图
Figure 3. Back-scattered image and variation diagram showing the potassium feldspar composition in medium-grained rapakivi biotite monzogranites
图 4 都庞岭斑状黑云母二长花岗岩中钾长石Or-Ab-An分类图解(Smith, 1974)
Figure 4. Or-Ab-An diagram for the potassium feldspar in the Dupangling porphyrite biotite monzogranite (Smith, 1974)
图 5 都庞岭斑状黑云母二长花岗岩中黑云母的成分分类图(Foster, 1960)
A—金云母；B—镁质黑云母；C—铁质黑云母；D—铁叶黑云母；E—铁白云母；F—白云母
Figure 5. Diagram showing the biotite composition in the Dupangling porphyritic biotite monzogranite (Foster, 1960)
A-Phlogopite; B-Magnesian biotite; C-Ferric biotite; D-Siderophyllite; E-Ferrimuscovite; F-Muscovite
图 6 都庞岭黑云母二长花岗岩锆石U-Pb年龄谐和图
Figure 6. Zircon U-Pb concordant diagrams for the Dupangling biotite monzogranite
图 7 都庞岭黑云母二长花岗岩岩石化学图解
a—TAS分类图解(据Cox et al., 1979；Wilson, 1989修改)；b—Na2O-K2O图解；c—A/CNK-A/NK图解(Maniar and Piccoli, 1989)；d—SiO2-[(Na2O+K2O)-CaO] 图解(Frost，2001)
Figure 7. Petrochemical diagrams for the Dupangling biotite monzogranite
(a) TAS classification diagram(Schema is modified from Cox et al., 1979; Wilson, 1989); (b) Na2O-K2O diagram; (c) A/CNK-A/NK diagram(Schema from Maniar and Piccoli, 1989); (d) SiO2-[(Na2O+K2O)-CaO] diagram(Schema from Frost, 2001)
图 8 都庞岭岩体微量元素原始地幔蛛网图和稀土元素球粒陨石配分模式图(典型A型花岗岩的微量元素原始地幔标准化蛛网图和REE球粒陨石标准化图(蓝色)分布区域据张旗，2012修改；标准化数据引自Sun and Mcdonough, 1989)
a—微量元素原始地幔蛛网图；b—稀土元素球粒陨石配分模式图
Figure 8. Primitive mantle spider diagram for trace elements and chondrite partition pattern diagram for rare earth elements of the Dupangling pluton (Primitive mantle spider diagram of trace elements and REE chondrite standardized map (blue) of typical A-type granite are modified from Zhang, 2012; Standardized data are quoted from Sun and Mcdonough, 1989)
(a) Primitive mantle spider diagram for trace elements; (b) Chondrite partition pattern diagram for rare earth elements
图 9 都庞岭东侧岩体岩石类型判别图解
a—A型花岗岩的SiO2-TFeO/MgO判别图解(Whalen et al., 1987)；b—A型花岗岩的K2O-Na2O判别图解(Collins et al., 1982)
Figure 9. Discrimination diagram for the rock-type of the eastern part of the Dupangling pluton
(a) SiO2-TFeO/MgO discrimination diagram for A-type granite (Schema from Whalen et al., 1987); (b) K2O-Na2O discrimination diagram for A-type granite (Schema from Collins et al., 1982)
图 10 都庞岭东侧岩体岩石类型判别图解
a—A型花岗岩的10000×Ga/Al-Nb判别图解(Whalen et al., 1987)；b—A型花岗岩的10000×Ga/Al-TFeO/MgO判别图解(Whalen et al., 1987)
Figure 10. Discrimination diagram for the rock-type of the eastern part of the Dupangling pluton
(a) 10000×Ga/Al-Nb discrimination diagram for A-type granite(Schema from Whalen et al., 1987); (b) 10000×Ga/Al-TFeO/MgO discrimination diagram for A-type granite(Schema from Whalen et al., 1987)
图 11 都庞岭岩体印支期花岗岩εHf(t)-t关系图
(华夏基底数据引自Yu et al., 2010；扬子基底数据引自Wang et al., 2010和何苗等，2018；三条虚线代表的地壳演化趋势线于津海等，2007)
Figure 11. εHf(t)-t diagram for the Indosinian Dupangling granite (Huaxia base data from Yu et al., 2010; Yangtze base Data from Wang et al., 2010 and He et al., 2018; The three dotted lines which represent crustal evolution trend from Jin et al., 2007)
图 12 都庞岭二长花岗岩中黑云母的TFeO/(TFeO+MgO)-MgO图解(周作侠，1988)
Figure 12. TFeO/(TFeO+MgO)-MgO diagram for the biotite in the Dupangling monzonite granite
图 13 Nb-Y及Rb-Yb+Ta环境判别图解(Pearce，1996)
WPG—板内花岗岩；ORG—洋脊花岗岩；VAG—火山弧花岗岩；syn-COLG—同碰撞花岗岩；post-COLG—后碰撞花岗岩
a—Nb-Y环境判别图解；b—Rb-Yb+Ta环境判别图解Figure 13. Environmental discrimination diagrams of Nb-Y and Rb-Yb+Ta(Pearce, 1996)
(a) Nb-Y diagram; (b)Rb-Yb+Ta diagram
WPG-Intraplate granite; ORG-Ridge granite; VAG-Volcanic arc granite; syn-COLG-Syn-collisional granite; post-COLG-Post-collisional granite表 1 都庞岭花岗岩主要造岩矿物含量及副矿物含量表(%)
Table 1. Contents of major rock-forming minerals and accessory minerals of the Dupangling granite (%)
类型/矿物 石英 钾长石 斜长石 黑云母 磁铁矿 磷灰石 粗中粒斑状黑云母二长 30~36 32~35 28~33 2~3 1~3 <1 花岗岩 均值 33 34 31 3 2 中粒斑状(环斑)黑 33~38 30~35 25~30 2~3 1~3 <1 云母二长花岗岩 均值 35 33 27 2 2 
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表 2 都庞岭斑状黑云母二长花岗岩黑云母化学组成电子探针分析结果
Table 2. Electron probe analysis results of the biotite chemical composition of the Dupangling porphyritic biotite monzogranite
样品号 D0066-1-1 D0066-1-1 位置 黑云母斑晶1 黑云母斑晶2 黑云母基质1 黑云母基质2 点号 1 2 3 4 5 6 7 8 1 2 3 4 5 6 1 2 3 4 5 6 7 1 2 3 4 单位：% SiO2 37.19 37.65 37.4 36.92 37.14 37.00 37.67 37.49 37.70 37.51 37.45 38.01 37.69 37.75 37.84 36.98 37.34 37.6 37.87 37.49 37.92 37.52 37.49 37.55 37.21 TiO2 3.68 3.05 3.47 4.09 4.59 4.27 3.26 2.44 3.35 3.56 4.08 3.07 3.41 4.31 2.89 2.77 3.63 4.26 4.08 3.58 2.90 4.09 3.49 4.08 4.61 Al2O3 13.97 14.51 14.20 13.54 13.56 13.69 14.03 14.69 13.88 13.92 13.62 14.22 13.74 13.53 14.45 13.69 13.66 13.31 13.47 13.95 14.64 13.84 14.26 13.97 13.65 TFeO 22.27 22.37 22.95 22.68 22.91 22.46 22.35 22.29 23.36 23.45 23.41 22.94 23.04 23.28 23.70 22.57 23.48 23.08 22.84 22.96 23.10 22.84 22.81 23.09 22.87 MnO 0.32 0.31 0.35 0.24 0.32 0.35 0.37 0.22 0.28 0.34 0.33 0.30 0.35 0.35 0.38 0.46 0.28 0.35 0.27 0.31 0.32 0.37 0.41 0.37 0.35 MgO 4.50 4.74 4.70 4.29 4.27 4.22 4.62 4.75 4.55 4.27 4.26 4.80 4.64 4.39 4.47 4.88 4.66 4.47 4.53 4.67 4.51 4.40 4.54 4.36 4.11 CaO 0.06 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.03 0.03 0.01 0.00 0.00 0.05 0.08 0.10 0.02 0.00 0.00 0.00 0.03 0.03 0.00 0.01 K2O 11.44 11.61 11.51 11.39 11.31 11.44 11.75 11.66 11.61 11.60 11.61 11.64 11.68 11.30 11.49 11.50 11.65 11.60 11.65 11.73 11.71 11.70 11.69 11.67 11.53 Cl 0.09 0.09 0.10 0.08 0.09 0.09 0.08 0.09 0.09 0.08 0.09 0.08 0.09 0.07 0.08 0.09 0.09 0.08 0.10 0.09 0.09 0.05 0.09 0.06 0.10 F 0.00 0.12 0.00 0.00 0.00 0.00 0.15 0.10 0.19 0.00 0.00 0.16 0.06 0.00 0.00 0.09 0.06 0.00 0.12 0.08 0.03 0.01 0.03 0.00 0.00 以23个氧原子计算的阳离子数 Si 5.95 5.96 5.92 5.94 5.91 5.93 5.99 5.98 5.97 5.95 5.94 5.98 5.98 5.96 5.96 5.97 5.92 5.96 5.99 5.94 5.96 5.93 5.93 5.92 5.91 AlIV 2.05 2.04 2.08 2.06 2.09 2.07 2.01 2.02 2.03 2.05 2.06 2.02 2.02 2.04 2.04 2.03 2.08 2.04 2.01 2.06 2.04 2.07 2.07 2.08 2.09 AlVI 0.58 0.67 0.57 0.51 0.46 0.51 0.61 0.74 0.56 0.55 0.48 0.62 0.54 0.47 0.64 0.57 0.48 0.44 0.49 0.54 0.68 0.51 0.59 0.52 0.47 Ti 0.44 0.36 0.41 0.49 0.55 0.51 0.39 0.29 0.4 0.42 0.49 0.36 0.41 0.51 0.34 0.34 0.43 0.51 0.48 0.43 0.34 0.49 0.42 0.48 0.55 Fe2+ 2.53 2.41 2.47 2.63 2.74 2.64 2.41 2.31 2.51 2.56 2.61 2.44 2.45 2.77 2.52 2.27 2.43 2.6 2.60 2.42 2.45 2.54 2.44 2.57 2.70 Fe3+ 0.45 0.55 0.57 0.42 0.31 0.37 0.57 0.66 0.59 0.55 0.50 0.58 0.60 0.31 0.60 0.78 0.69 0.46 0.42 0.62 0.59 0.48 0.58 0.48 0.35 Mn 0.04 0.04 0.05 0.03 0.04 0.05 0.05 0.03 0.04 0.05 0.04 0.04 0.05 0.05 0.05 0.06 0.04 0.05 0.04 0.04 0.04 0.05 0.05 0.05 0.05 Mg 1.07 1.12 1.11 1.03 1.01 1.01 1.09 1.13 1.07 1.01 1.01 1.13 1.10 1.03 1.05 1.17 1.10 1.06 1.07 1.10 1.06 1.04 1.07 1.03 0.97 Ca 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.00 0.00 0.00 0.01 0.01 0.02 0.00 0.00 0.00 0.00 0.01 0.01 0.00 0.00 K 2.33 2.34 2.32 2.34 2.30 2.34 2.38 2.37 2.35 2.35 2.35 2.34 2.36 2.27 2.31 2.37 2.36 2.35 2.35 2.37 2.35 2.36 2.36 2.35 2.34 Cl 0.02 0.02 0.03 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.03 0.02 0.02 0.01 0.02 0.02 0.03 F 0.00 0.06 0.00 0.00 0.00 0.00 0.08 0.05 0.10 0.00 0.00 0.08 0.03 0.00 0.00 0.05 0.03 0.00 0.06 0.04 0.01 0.01 0.02 0.00 0.00 OH 3.98 3.92 3.97 3.98 3.98 3.98 3.90 3.93 3.88 3.98 3.98 3.9 3.95 3.98 3.98 3.93 3.95 3.98 3.91 3.94 3.96 3.98 3.96 3.98 3.97 TFe/(TFe+Mg) 0.74 0.73 0.73 0.75 0.75 0.75 0.73 0.72 0.74 0.75 0.76 0.73 0.74 0.75 0.75 0.72 0.74 0.74 0.74 0.73 0.74 0.74 0.74 0.75 0.76 Fe3+/TFe 0.15 0.19 0.19 0.14 0.10 0.12 0.19 0.22 0.19 0.18 0.16 0.19 0.20 0.10 0.19 0.26 0.22 0.15 0.14 0.20 0.19 0.16 0.19 0.16 0.11 Mg/(Mg+Fe) 0.26 0.27 0.27 0.25 0.25 0.25 0.27 0.28 0.26 0.25 0.24 0.27 0.26 0.25 0.25 0.28 0.26 0.26 0.26 0.27 0.26 0.26 0.26 0.25 0.24
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表 3 都庞岭环斑黑云母二长花岗岩钾长石化学组成电子探针分析结果
Table 3. Electron probe analysis results of the chemical composition of potassium feldspar in the Dupangling rapakivi biotite monzogranite
样品号 D0072 位置 钾长石：斑晶 点号 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 单位：% SiO2 64.37 64.66 64.62 64.49 65.26 64.43 64.96 65.11 65.00 64.36 64.08 65.00 65.15 64.74 64.56 65.11 65.10 64.73 64.95 TiO2 0.03 0.05 0.04 0.02 0.00 0.04 0.04 0.00 0.03 0.04 0.08 0.05 0.00 0.03 0.02 0.00 0.06 0.01 0.00 Al2O3 18.15 18.28 18.19 18.20 18.09 18.10 18.27 18.19 18.14 17.96 18.17 18.19 18.45 18.40 18.17 18.15 18.21 17.83 18.12 FeO 0.07 0.07 0.10 0.06 0.05 0.06 0.05 0.09 0.10 0.05 0.05 0.09 0.07 0.09 0.08 0.08 0.08 0.04 0.00 MnO 0.01 0.00 0.00 0.00 0.00 0.00 0.03 0.00 0.04 0.00 0.03 0.00 0.00 0.00 0.02 0.02 0.00 0.00 0.02 MgO 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.00 CaO 0.05 0.11 0.11 0.13 0.00 0.00 0.14 0.11 0.07 0.00 0.03 0.09 0.15 0.09 0.03 0.08 0.13 0.02 0.03 Na2O 1.54 2.29 2.04 2.21 1.85 0.54 2.76 2.97 2.29 0.54 0.89 2.83 2.83 2.48 0.83 2.70 2.65 1.22 0.95 K2O 14.86 13.92 14.05 14.14 14.33 16.64 12.94 12.89 13.82 16.41 15.37 13.08 12.67 13.50 16.02 13.38 13.11 15.52 15.86 BaO 0.48 0.64 0.44 0.49 0.24 0.44 0.41 0.48 0.45 0.18 0.59 0.37 0.38 0.53 0.52 0.36 0.35 0.17 0.05 总和 99.56 100.02 99.58 99.75 99.82 100.25 99.61 99.84 99.94 99.54 99.29 99.70 99.70 99.85 100.25 99.89 99.68 99.56 99.98 基于8个氧原子计算 Si 2.99 2.99 2.99 2.99 3.01 2.99 2.99 3.00 3.00 3.00 2.99 2.99 2.99 2.99 2.99 3.00 3.00 3.01 3.00 Al 0.99 0.99 0.99 0.99 0.98 0.99 0.99 0.99 0.99 0.99 1.00 0.99 1.00 1.00 0.99 0.98 0.99 0.98 0.99 Ca 0.00 0.01 0.01 0.01 0.00 0.00 0.01 0.01 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.01 0.00 0.00 Na 0.14 0.21 0.18 0.20 0.16 0.05 0.25 0.26 0.20 0.05 0.08 0.25 0.25 0.22 0.07 0.24 0.24 0.11 0.09 K 0.88 0.82 0.83 0.84 0.84 0.99 0.76 0.76 0.81 0.98 0.92 0.77 0.74 0.79 0.95 0.79 0.77 0.92 0.94 Ba 0.01 0.01 0.01 0.01 0.00 0.01 0.01 0.01 0.01 0.00 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.00 0.00 Or 86.17 79.56 81.46 80.28 83.60 95.34 75.01 73.69 79.60 95.22 91.81 74.92 74.10 77.84 92.56 76.20 76.02 89.24 91.55 Ab 13.61 19.93 18.01 19.11 16.38 4.66 24.31 25.81 20.05 4.78 8.04 24.63 25.18 21.71 7.31 23.40 23.36 10.65 8.33 An 0.22 0.51 0.53 0.61 0.02 0.00 0.67 0.50 0.35 0.00 0.16 0.45 0.72 0.45 0.14 0.40 0.62 0.12 0.13
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表 4 都庞岭环斑黑云母二长花岗岩钾长石化学组成电子探针分析结果
Table 4. Electron probe analysis results of the chemical composition of potassium feldspar in the Dupangling rapakivi biotite monzogranite
样品号 D0070-2-1 位置 钾长石：基质矿物 点号 1 2 3 4 5 6 7 8 9 10 11 12 单位：% SiO2 65.12 64.61 65.06 64.80 65.26 64.81 65.00 65.03 65.21 64.98 64.73 64.58 TiO2 0.04 0.00 0.00 0.01 0.00 0.00 0.00 0.01 0.00 0.02 0.02 0.00 Al2O3 18.07 17.96 18.13 18.04 17.95 17.89 17.84 18.12 18.01 17.90 18.00 17.91 FeO 0.03 0.01 0.06 0.03 0.09 0.00 0.00 0.02 0.01 0.03 0.06 0.04 MnO 0.00 0.01 0.01 0.03 0.00 0.04 0.00 0.00 0.00 0.02 0.00 0.00 MgO 0.00 0.02 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.00 CaO 0.00 0.02 0.02 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Na2O 0.50 0.51 0.54 0.55 0.45 0.48 0.39 0.37 0.46 0.36 0.44 0.35 K2O 16.76 16.39 16.51 16.55 16.70 16.49 16.73 16.90 16.76 17.05 16.68 16.57 BaO 0.03 0.13 0.00 0.00 0.07 0.04 0.00 0.00 0.05 0.05 0.01 0.00 总和 100.55 99.65 100.32 100.01 100.53 99.73 99.96 100.45 100.49 100.40 99.96 99.46 基于8个氧原子计算 Si 3.00 3.00 3.00 3.00 3.01 3.01 3.01 3.00 3.01 3.01 3.00 3.01 Al 0.98 0.98 0.99 0.99 0.98 0.98 0.97 0.99 0.98 0.98 0.98 0.98 Na 0.04 0.05 0.05 0.05 0.04 0.04 0.04 0.03 0.04 0.03 0.04 0.03 K 0.99 0.97 0.97 0.98 0.98 0.98 0.99 1.00 0.99 1.01 0.99 0.98 Ba 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Or 95.68 95.40 95.22 95.14 96.05 95.77 96.57 96.75 95.96 96.93 96.14 96.90 Ab 4.30 4.53 4.69 4.83 3.95 4.23 3.43 3.25 4.04 3.07 3.86 3.10 An 0.02 0.07 0.09 0.02 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
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表 5 都庞岭黑云母二长花岗岩锆石SHRIMP U-Pb同位素分析结果
Table 5. Zircon SHRIMP U-Pb isotopic analysis results of the Dupangling biotite monzogranite
测试点 206Pbc/% 元素含量/(μg/g) Th/U 同位素比值 年龄/Ma 不一致性/% U Th 206Pb* 207Pb*/206Pb* ±/% 207Pb*/235U ±/% 206Pb*/238U ±/% 206Pb/238U 1σ 208Pb/232Th 1σ 样号：D0056粗中粒斑状黑云母二长花岗岩 D0056-1 1.77 3259 544 103.0 0.17 0.0508 3.3 0.2520 3.5 0.03598 1.2 227.9 ±2.8 233.0 ±21.0 2 D0056-2 0.41 338 218 9.8 0.67 0.0514 2.9 0.2387 3.2 0.03365 1.4 213.4 ±2.9 209.3 ±5.1 18 D0056-3 3.01 413 258 12.3 0.65 0.0512 12.1 0.2380 12.1 0.03367 1.5 213.5 ±3.1 204.0 ±17.0 14 D0056-4 2.30 361 248 10.8 0.71 0.0512 8.9 0.2400 9.1 0.03395 1.5 215.2 ±3.1 196.0 ±12.0 15 D0056-5 0.41 784 379 23.0 0.50 0.0497 3.0 0.2333 3.3 0.03406 1.3 215.9 ±2.7 200.4 ±5.8 -20 D0056-7 0.12 587 353 17.1 0.62 0.0509 3.1 0.2383 3.4 0.03397 1.4 215.3 ±3.0 211.2 ±4.9 9 D0056-8 0.31 970 613 28.8 0.65 0.0499 2.4 0.2371 2.7 0.03446 1.3 218.4 ±2.7 199.8 ±4.4 -15 D0056-9 0.24 264 180 7.8 0.70 0.0504 5.4 0.2380 5.6 0.03417 1.4 216.6 ±3.1 216.5 ±9.5 -1 D0056-10 0.61 250 236 7.3 0.98 0.0512 8.9 0.2400 9.0 0.03400 1.5 215.5 ±3.2 208.6 ±9.1 13 D0056-13 2.20 501 357 15.8 0.74 0.0514 8.0 0.2550 8.1 0.03597 1.6 227.8 ±3.5 224.0 ±11.0 12 样号：D0059中粒斑状黑云母二长花岗岩 D0059-1 2.22 1528 552 46.2 0.37 0.0502 5.0 0.2380 5.1 0.03439 1.3 217.9 ±2.7 179.0 ±14.0 -6 D0059-3 2.05 642 477 19.4 0.77 0.0518 7.5 0.2460 7.6 0.03439 1.3 217.9 ±2.9 164.8 ±9.4 21 D0059-4 0.28 1384 633 44.3 0.47 0.0509 1.7 0.2611 2.1 0.03714 1.2 235.1 ±2.8 212.5 ±4.3 2 D0059-5 0.43 242 159 7.3 0.68 0.0497 3.4 0.2385 3.7 0.03480 1.4 220.5 ±3.1 206.5 ±6.0 -22 D0059-6 0.42 353 279 10.6 0.82 0.0524 3.2 0.2525 3.5 0.03491 1.4 221.2 ±3.0 215.2 ±5.5 27 D0059-7 0.18 321 199 9.6 0.64 0.0509 4.8 0.2440 5.0 0.03479 1.4 220.4 ±3.0 214.8 ±6.8 6 D0059-8 0.40 531 342 16.1 0.67 0.0516 2.8 0.2503 3.2 0.03519 1.4 222.9 ±3.1 157.3 ±4.8 17 D0059-10 0.23 494 298 14.6 0.62 0.0506 2.8 0.2402 3.1 0.03440 1.3 218.0 ±2.8 208.2 ±4.4 3 D0059-12 0.46 781 445 23.6 0.59 0.0511 3.1 0.2472 3.3 0.03506 1.3 222.1 ±2.8 204.6 ±5.5 10 D0059-13 0.11 543 520 16.5 0.99 0.0505 2.0 0.2458 2.4 0.03528 1.3 223.5 ±2.8 205.4 ±6.0 -2 D0059-14 0.31 561 322 16.8 0.59 0.0504 1.9 0.2422 2.3 0.03485 1.3 220.8 ±2.8 214.0 ±4.1 -3 样号：D0070-1中粒环斑黑云母二长花岗岩 D0070-1-1 0.25 415 235 12.4 0.58 0.0500 5.4 0.2390 5.6 0.03474 1.2 220.1 ±2.7 218.4 ±8.9 -14 D0070-1-2 0.00 523 312 15.7 0.62 0.0501 2.4 0.2419 2.6 0.03498 1.2 221.7 ±2.6 219.9 ±4.5 -10 D0070-1-3 - 1179 393 36.2 0.34 0.0512 1.3 0.2529 1.7 0.03580 1.1 226.7 ±2.5 222.6 ±3.9 10 D0070-1-4 0.01 324 114 9.9 0.36 0.0525 3.3 0.2596 3.5 0.03589 1.2 227.3 ±2.8 213.4 ±8.2 26 D0070-1-5 0.01 345 179 10.6 0.54 0.0513 3.3 0.2528 3.6 0.03575 1.2 226.5 ±2.7 220.0 ±6.1 11 D0070-1-6 - 474 721 14.3 1.57 0.0517 2.4 0.2512 2.7 0.03524 1.2 223.3 ±2.6 218.8 ±3.6 18 D0070-1-7 1.28 1509 699 46.4 0.48 0.0488 4.9 0.2380 5.0 0.03534 1.1 223.9 ±2.5 210.3 ±9.5 -61 D0070-1-8 0.33 626 346 18.4 0.57 0.0477 5.5 0.2250 5.6 0.03416 1.2 216.6 ±2.5 209.5 ±6.0 -163 D0070-1-11 0.00 532 350 16.1 0.68 0.0519 2.0 0.2525 2.3 0.03530 1.2 223.6 ±2.6 215.8 ±4.8 20 D0070-1-12 0.26 1126 477 34.2 0.44 0.0498 2.4 0.2420 2.7 0.03521 1.1 223.1 ±2.5 208.8 ±5.4 -19 D0070-1-13 0.33 683 308 20.6 0.47 0.0498 3.2 0.2397 3.4 0.03494 1.2 221.4 ±2.5 208.4 ±6.5 -20 D0070-1-14 1.55 494 285 15.0 0.60 0.0486 7.1 0.2330 7.2 0.03476 1.3 220.3 ±2.9 205 ±11.0 -70 注：Pbc和Pb*分别代表普通铅和放射成因铅；206Pbc指普通铅中的206Pb占全铅206Pb的百分数。
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表 6 都庞岭岩体主量元素和微量元素分析结果(主量元素/%；微量、稀土元素/×10-6；Au/×10-9)
Table 6. Major and trace elements compositions of the Dupangling pluton (main elements/%, trace and REE elements/×10-6, Au/×10-9)
D0055 D0056 D0057 D0059 D0065 D0067-1 D0070 D0070-1 D0072 D0054 斑状黑云母二长花岗岩 环斑黑云母二长花岗岩 SiO2 78.15 76.11 76.11 76.99 77.03 75.57 76.08 76.69 73.82 78.51 TiO2 0.11 0.13 0.12 0.04 0.17 0.08 0.11 0.09 0.25 0.08 Al2O3 11.91 11.81 12.11 12.46 12.06 12.17 12.32 12.12 13.58 12.12 FeO 0.92 1.74 1.86 1.01 1.41 1.79 1.62 1.14 2.02 1.51 Fe2O3 1.67 2.16 2.35 1.41 1.88 2.12 1.97 1.71 2.75 2.14 MnO 0.04 0.05 0.06 0.04 0.04 0.05 0.04 0.03 0.05 0.02 MgO 0.12 0.22 0.17 0.03 0.23 0.07 0.13 0.11 0.37 0.18 CaO 0.19 0.65 0.61 0.26 0.93 0.58 0.62 0.45 0.99 0.12 Na2O 2.71 2.90 3.19 3.64 2.93 3.17 3.12 3.12 2.84 4.12 K2O 4.98 4.51 4.65 4.54 4.94 5.19 5.05 4.93 5.36 1.64 P2O5 0.02 0.02 0.02 0.01 0.03 0.01 0.02 0.01 0.06 0.02 烧失量 0.70 0.66 0.33 0.39 0.35 0.23 0.28 0.36 0.51 0.68 总和 101.52 100.96 101.58 100.82 102.00 101.03 101.36 100.76 102.60 101.14 ALK 7.69 7.41 7.84 8.18 7.87 8.36 8.17 8.05 8.22 5.76 FeOT 2.42 3.68 3.98 2.27 3.09 3.71 3.37 2.68 4.50 3.43 A/CNK 1.17 1.09 1.06 1.09 1.02 1.02 1.05 1.07 1.12 1.39 A/NK 1.21 1.22 1.18 1.14 1.18 1.12 1.16 1.15 1.29 1.42 δ 1.68 1.66 1.86 1.97 1.82 2.15 2.02 1.92 2.18 0.93 W 18.10 12.20 21.90 22.10 4.10 5.90 3.50 5.50 6.60 7.50 Sn 14.00 23.00 20.00 41.00 15.00 13.00 19.00 20.00 12.30 11.00 Mo 0.58 1.15 0.85 1.77 0.51 2.76 0.3 0.31 0.38 0.81 Bi 9.91 1.24 3.17 2.61 2.01 0.65 1.73 1.62 1.24 0.36 Cu 4.80 4.40 2.70 19.20 2.80 3.60 2.50 3.30 9.50 10.00 Pb 55.60 46.30 54.20 74.80 45.80 52.80 56.00 60.40 38.40 18.50 Zn 29.00 26.00 32.00 25.00 27.00 21.00 25.00 23.00 30.00 19.00 Sb 0.27 0.41 0.35 0.29 0.36 0.64 0.28 0.31 0.34 0.54 Cr 4.00 7.00 4.00 3.00 6.00 4.00 4.00 4.00 7.00 6.00 Ni 1.50 2.60 2.00 1.00 2.10 1.30 1.40 1.10 3.00 2.30 Co 1.30 1.50 1.40 0.50 2.00 1.00 1.20 1.00 2.90 1.30 Hg 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 V 5.00 6.00 6.00 1.00 12.00 3.00 5.00 5.00 18.00 4.00 Nb 15.80 16.60 20.90 24.50 14.30 13.40 13.90 14.00 11.60 19.20 Ta 3.73 3.71 4.56 4.25 2.87 3.01 2.82 2.72 1.71 4.78 Th 48.20 46.00 58.20 39.90 57.00 64.40 58.50 54.40 43.80 47.00 U 13.20 21.20 18.50 22.90 16.10 23.60 13.00 11.10 7.50 17.10 Zr 90.00 105.00 123.00 123.00 129.00 91.00 136.00 126.00 141.00 105.00 Hf 3.90 4.90 5.20 6.40 4.30 3.70 5.40 5.40 4.30 4.60 Rb 550.00 544.00 640.00 772.00 460.00 590.00 530.00 490.00 409.00 201.00 Cs 19.30 30.40 44.00 39.70 22.70 31.90 35.00 30.10 24.00 11.80 Sr 13.00 16.50 13.60 2.90 33.20 6.90 21.60 23.70 53.30 47.40 Ba 58.70 58.50 54.40 8.00 151.00 10.10 77.40 63.50 409.00 87.60 Li 58.60 61.30 128.50 154.00 80.10 40.40 71.90 49.50 85.80 55.20 Be 5.41 7.61 6.07 9.36 7.28 7.99 7.56 9.15 4.08 5.71 As 60.20 7.10 0.30 4.30 0.20 2.60 3.10 5.50 1.00 35.10 Ga 18.20 17.85 19.80 20.90 17.45 18.00 18.45 17.85 17.95 17.85 Sc 5.80 5.30 6.90 5.20 5.30 5.80 4.70 4.40 5.60 6.00 Au 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 Ag 0.15 0.03 0.03 0.08 0.03 0.04 0.14 0.13 0.04 0.03 F 710.00 1930.00 2060.00 1580.00 1570.00 1340.00 1280.00 1030.00 720.00 1040.00 Cl 60.00 50.00 50.00 80.00 90.00 90.00 100.00 70.00 90.00 50.00 Cd 0.04 0.02 0.02 0.02 0.03 0.02 0.70 0.06 0.06 0.02 B 5.00 5.00 7.00 7.00 10.00 18.00 5.00 5.00 8.00 16.00 La 24.80 26.50 36.40 7.10 48.50 35.20 32.40 28.40 35.70 24.90 Ce 73.80 62.70 87.30 26.80 108.50 86.30 75.90 66.80 85.90 62.80 Pr 7.25 7.71 10.35 2.57 12.25 10.75 8.92 8.29 8.37 7.34 Nd 26.30 28.10 39.40 11.60 43.40 39.60 32.90 30.40 29.70 28.30 Sm 6.76 8.02 10.71 4.82 9.79 10.75 9.16 8.08 5.91 9.05 Eu 0.11 0.18 0.15 0.05 0.34 0.12 0.21 0.17 0.56 0.26 Gd 7.68 9.46 11.70 6.46 9.37 11.05 8.73 8.47 5.07 10.35 Tb 1.49 1.82 2.32 1.66 1.75 2.22 1.59 1.61 0.93 2.45 Dy 11.15 12.61 15.31 12.22 11.45 13.71 10.55 10.50 5.78 17.20 Ho 2.57 2.63 3.43 2.91 2.43 2.96 2.26 2.26 1.22 3.74 Er 8.35 9.09 10.25 9.72 7.06 8.59 6.97 7.15 3.52 10.90 Tm 1.42 1.43 1.71 1.63 1.09 1.33 1.12 1.19 0.55 1.81 Yb 9.62 9.21 11.50 11.23 7.12 8.48 7.53 7.96 3.73 12.30 Lu 1.48 1.41 1.74 1.81 1.04 1.26 1.14 1.14 0.54 1.89 Y 80.20 80.80 99.90 90.60 66.70 79.30 66.10 72.10 34.90 111.00 ∑REE 263.00 261.60 342.10 191.10 330.80 311.60 265.50 254.50 222.40 304.30 δEu 0.05 0.06 0.04 0.03 0.11 0.03 0.07 0.06 0.31 0.08 L/H 1.12 1.04 1.17 0.38 2.06 1.42 1.51 1.26 2.95 0.77 注：DI—分异指数(CIPW标准矿物, %)；A/CNK—铝饱和指数(Al2O3/(CaO+Na2O+K2O), 摩尔比)；A/NK—碱度指数(Al2O3/(N2O+K2O), 摩尔比)；ALK—全碱含量；δ—里特曼钙碱指数；L/H—LREE/HREE
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表 7 都庞岭花岗岩体岩石样品的Sm-Nd同位素组成
Table 7. Sm-Nd isotopic compositions of the Dupangling granite samples
样号 Sm Nd 147Sm/144Nd 143Nd/144Nd εNd(t) T2DM/Ga ×10-6 D0056 9.476 31.92 0.1796 0.512166±3 -8.74 1.71 D0059 4.376 9.913 0.2671 0.512323±6 -8.13 1.66 D0070 7.289 29.58 0.1491 0.512145±4 -8.27 1.67 D0072 6.216 30.72 0.1224 0.512102±4 -8.35 1.68
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表 8 都庞岭岩体锆石Hf同位素分析结果
Table 8. The isotopic analysis results of zircon Hf of the Dupangling pluton
点号 年龄/Ma 176Yb/177Hf 176Lu/177Hf 176Hf/177Hf ±2σ εHf(0) εHf(t) TDM/Ma T2DM/Ma fLu/Hf 样号：D0056-斑状黑云母二长花岗岩 D0056-1 215.6 0.020377 0.000721 0.282509 0.000021 -10.8 -6.2 1103 1638 -0.98 D0056-2 215.6 0.018715 0.000655 0.282532 0.000018 -10.1 -5.5 1083 1594 -0.97 D0056-3 215.6 0.020258 0.000704 0.282466 0.000015 -10.5 -5.9 1103 1622 -0.97 D0056-4 215.6 0.030060 0.001029 0.282487 0.000017 -18.7 -14.1 1425 2136 -0.97 D0056-5 215.6 0.033720 0.001157 0.282475 0.000017 -8.8 -4.2 1027 1514 -0.98 D0056-6 215.6 0.031632 0.001083 0.282244 0.000018 -9.5 -4.9 1058 1556 -0.97 D0056-7 215.6 0.022624 0.000809 0.282522 0.000018 -7.4 -2.7 965 1421 -0.98 D0056-8 215.6 0.028110 0.000998 0.282504 0.000016 -6.8 -2.2 957 1388 -0.96 D0056-9 215.6 0.017312 0.000626 0.282563 0.000027 -12.0 -7.5 1167 1719 -0.96 D0056-10 215.6 0.034881 0.001229 0.282580 0.000021 -10.5 -6.0 1101 1623 -0.97 D0056-11 215.6 0.033261 0.001262 0.282432 0.000017 -7.5 -2.9 972 1428 -0.98 D0056-12 215.6 0.029144 0.001042 0.282474 0.000021 -10.8 -6.2 1103 1638 -0.98 D0056-13 215.6 0.020128 0.000727 0.282560 0.000024 -10.1 -5.5 1083 1594 -0.97 样号：D0070-1-中粒环斑黑云母二长花岗岩 D0070-1-1 222.8 0.019528 0.000692 0.282570 0.000025 -7.1 -2.4 957 1401 -0.98 D0070-1-2 222.8 0.019195 0.000665 0.282563 0.000018 -7.4 -2.6 966 1417 -0.98 D0070-1-3 222.8 0.033373 0.001136 0.282476 0.000016 -10.5 -5.7 1101 1615 -0.97 D0070-1-4 222.8 0.030688 0.001138 0.282500 0.000022 -9.6 -4.9 1067 1562 -0.97 D0070-1-5 222.8 0.016223 0.000576 0.282530 0.000017 -8.6 -3.8 1010 1490 -0.98 D0070-1-6 222.8 0.033771 0.001218 0.282521 0.000017 -8.9 -4.2 1040 1516 -0.96 D0070-1-7 222.8 0.034678 0.001256 0.282507 0.000016 -9.4 -4.7 1061 1547 -0.96 D0070-1-8 222.8 0.021611 0.000804 0.282537 0.000018 -8.3 -3.5 1006 1476 -0.98 D0070-1-9 222.8 0.032734 0.001206 0.282300 0.000016 -16.7 -12.0 1351 2008 -0.96 D0070-1-10 222.8 0.035717 0.001309 0.282310 0.000019 -16.3 -11.6 1341 1987 -0.96 D0070-1-11 222.8 0.022271 0.000819 0.282598 0.000024 -6.2 -1.4 921 1340 -0.98 D0070-1-12 222.8 0.030175 0.001107 0.282519 0.000019 -8.9 -4.2 1040 1519 -0.97 D0070-1-13 222.8 0.027758 0.001012 0.282538 0.000028 -8.3 -3.5 1010 1476 -0.97 D0070-1-14 222.8 0.017280 0.000636 0.282540 0.000017 -8.2 -3.4 998 1468 -0.98
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