Li-Sr-Nd Isotopes and Geochemistry of Wushan Intermediate-Acidic Magmatic Rocks in Middle-Lower Yangtze River Region
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摘要: 为确定长江中下游地区中酸性岩石的成因，对武山花岗闪长斑岩、石英闪长玢岩和基性岩脉进行Li-Sr-Nd同位素和地球化学分析测试.武山花岗闪长斑岩样品以高SiO2、MgO、K2O和低Na2O的含量，富集大离子亲石元素和轻稀土元素，Y和Yb相对亏损为特征.花岗闪长斑岩的全岩（87Sr/86Sr）i、εNd（t）和δ7Li值分别为0.703 0~0.707 4、-5.1~-4.6和+0.9‰~+3.2‰，均介于地壳和地幔端元的同位素值之间，揭示出年轻下地壳起源的长英质熔体和富集地幔起源的基性熔体之间的壳幔岩浆混合过程.岩浆在上升至侵位过程中经历了轻微的以辉石和角闪石为主的分离结晶和轻微的地壳混染作用.长江中下游地区早白垩世中酸性岩及相关矿床与古太平洋板块俯冲引起的软流圈地幔上涌及其引起的岩石圈活化有关.
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关键词:
- 长江中下游地区 /
- 武山 /
- 中酸性岩石 /
- 地球化学 /
- Li-Sr-Nd同位素
Abstract: To provide important insights into the petrogenesis of the Early Cretaceous intermediate-acidic magmatic rocks in middle-lower Yangtze River region, it carried out a detailed investigation of Li-Sr-Nd isotopes and geochemistry for the Wushan granodiorite porphyry, quartz diorite porphyry and the basic dyke. The Wushan granodiorite porphyry samples are characterized by the high concentrations of SiO2, MgO, and K2O and low concentration of Na2O, respectively, enrichment in LREEs and LILEs, and relative depletion in Y and Yb. They exhibit isotopic values of (87Sr/86Sr)i=0.703 0-0.707 4, εNd(t)=-5.1--4.6, and δ7Li=+0.9‰-+3.2‰, respectively, which are between the isotopic values of crustal and mantle end-members, revealing a crust-mantle mixing process between felsic melts from a juvenile lower crust and mafic melts from an enriched mantle source. They were subsequently subjected to weakly fractional crystallization of pyroxene and hornblende and minor crustal contamination during the ascent and emplacement. The Early Cretaceous intermediate-acidic magmatic rocks and related deposits in middle-lower Yangtze River region could be related to upwelling of asthenospheric mantle caused by the subduction of the Paleo-Pacific plate and its induced reactivation of sub-continental lithosphere. -
图 1 长江中下游地区晚中生代岩浆岩和相关矿床地质简图
据Pan and Dong（1999）、Mao et al.（2011）、Xie et al.（2011）修改
Fig. 1. Geological sketch map showing the distribution of the Late Mesozoic magmatic rocks and related ore deposits in the middle-lower Yangtze River region
图 2 （a）九瑞矿集区地质简图（据Xu et al.，2014修改）；（b）武山矿区地质简图及采样位置（据Yang et al.，2011修改）；（c）花岗闪长斑岩的薄片照片；（d）石英闪长玢岩的薄片照片
Fig. 2. (a) Geological sketch map of the Jiurui district (modified from Xu et al., 2014); (b) geological sketch map of the Wushan area (modified from Yang et al., 2011); (c) microphotograph of granodiorite porphyry; (d) microphotograph of quartz diorite porphyry
图 3 （a）TAS分类图解（据Irvine and Baragar, 1971）；（b）K2O-SiO2图解（据Rickwood，1989）；（c）A/NK-A/CNK图解（Maniar and Piccoli, 1989）
Fig. 3. (a) (Na2O+K2O) vs. SiO2 plot (Irvine and Baragar, 1971); (b)K2O vs. SiO2 plot (Rickwood, 1989); (c) A/NK vs. A/CNK plot (Maniar and Piccoli, 1989)
图 4 （a）球粒陨石标准化的稀土元素配分图和（b）原始地幔标准化的微量元素蛛网图（标准化值引自Sun and McDonough, 1989）
Fig. 4. (a) Chondrite-normalized REE patterns and (b) primitive mantle-normalized multi-element patterns (normalization values after Sun and McDonough, 1989)
图 5 （a）δ7Li值-LOI图解和（b）Ba/Nb-LOI图解
Fig. 5. (a) δ7Li value vs. LOI plot and (b) Ba/Nb vs. LOI plot
图 6 （a）Sr/Y-Y图解和（b）（La/Yb）N-（Yb）N图解（据Martin et al.，2005）
Fig. 6. (a) Sr/Y vs. Y plot and (b) (La/Yb)N vs. (Yb)N plot (Martin et al., 2005)
图 7 （a）MgO-SiO2图解（据Martin et al.，2005）和（b）Mg#-SiO2图解（据Yang et al.，2008）
Fig. 7. (a) MgO vs. SiO2 plot(Martin et al., 2005)and (b) Mg# vs. SiO2 plot (Yang et al., 2008)
图 8 （a）Rb/V-1/V图解和（b）δ7Li-Ba/Nb图解
Fig. 8. (a) Rb/V vs. 1/V plot and (b) δ7Li vs. Ba/Nb plot
图 10 δ7Li-Li图解
灰色实线、灰色虚线和黑色实线分别代表了镁铁质底侵下地壳起源的熔体与中上地壳、石炭系黄龙组白云岩和地幔物质二端元模拟曲线，曲线上数字代表了中上地壳、黄龙组白云岩和地幔物质加入的比例；流体活动趋势由花岗闪长斑岩和蚀变石英闪长玢岩厘定
Fig. 10. δ7Li vs. Li plot
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