Zircon U-Pb Geochronology, Geochemistry and Geological Significance of Daan Granite in Northwestern Margin of Yangtze Block
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摘要: 位于扬子板块西北缘宁强地区的大安花岗岩体，岩石类型主要为黑云母花岗闪长岩，但其形成时代却有一定的争议，成因及地质意义尚未明确.对大安花岗岩体进行详细的LA-ICP-MS锆石U-Pb年代学和岩石地球化学研究.结果表明，花岗闪长岩年龄为212.3±1.6 Ma和212.48±0.43 Ma，属晚三叠世.地球化学特征显示花岗闪长岩相对高硅（67.61%~69.02%）、高Al2O3（16.14%~16.80%），Na2O > K2O，富集大离子亲石元素（Cs、Ba）和轻稀土元素，Eu负异常不明显，强烈富集Sr（538×10-6~907×10-6）和亏损Y（3.10×10-6~3.90×10-6），高Sr/Y比值（138~291），表现出明显的埃达克质岩石的地球化学特征.综合区域地质资料认为，大安花岗岩体形成于后碰撞构造环境，是在华北板块与扬子板块碰撞后期伸展体制下，由于地幔物质上涌带来的热量导致加厚基性下地壳脱水熔融，形成了具有埃达克质性质的岩浆.Abstract: Located in the Ningqiang area of the northwest margin of the Yangtze block, the Daan granite consists mainly of biotite granodiorite. However, the petrogenesis and geological significances of the Daan pluton remain unclear in addition to the controversial formation age. In this paper, a detailed study of LA-ICP-MS zircon U-Pb geochronology and geochemistry is presented for the Daan granite.The results show that the age of granodiorite is 212.3±1.6 Ma and 212.48±0.43 Ma, belonging to the Late Triassic. Geochemically, the Daan granites have relatively high SiO2 (67.61%-69.02%) and Al2O3 (16.14%-16.80%) contents, and are enriched in LILE (Cs, Ba) and LREE. The samples display an insignificant negative Eu anomaly, low Y (3.10×10-6-3.90×10-6) contents, and high Sr contents (538×10-6-907×10-6) and Sr/Y ratios (138-291), exhibiting marked geochemical features of adakite. Combined with regional geological data, it is proposed that the Daan granite was formed in a post-collisional tectonic environment. The extensional regime after collision between the North China block and the Yangtze block induced the upwelling of mantle material, resulting in the dehydration and melting of thickened basic lower crust and formed the adakitic magma.
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图 1 大安花岗岩体构造位置及岩体地质简图
1.第四系；2.志留系茂县群；3.上震旦统灯影组；4.下震旦统陡山沱组；5.下南华统莲沱组；6.新元古界碧口岩群；7.大安花岗岩体；8.断层；9.产状；10.采样位置.据陕西省地质调查中心, 2017, 1:5万陕西省勉略宁地区地质图
Fig. 1. Regional location map and geological map of Daan granite
图 2 大安花岗岩体野外露头及显微镜下照片
a, c, d.黑云母花岗闪长岩；b.大安花岗岩体(γδT)与志留系茂县群(SM)侵入接触，岩体中可见围岩捕掳体.矿物名称缩写：Pl.斜长石；Qtz.石英；Bi.黑云母；Ap.磷灰石
Fig. 2. Field and microscopic photos of Daan granite
图 3 大安花岗岩体中粒黑云母花岗闪长岩(DA01/2)(a)和中粗粒黑云母花岗闪长岩(DA06/1)(b)代表性单颗粒锆石阴极发光图像和年龄值
Fig. 3. CL images and age values of selected zircons for biotite granodiorite (DA01/2) (a) and middle-coarse biotite granodiorite (DA06/1) (b) of the Daan granite
图 4 大安花岗岩体中粒黑云母花岗闪长岩(DA01/2)(a, b)和中粗粒黑云母花岗闪长岩(DA06/1)(c, d)锆石U-Pb年龄谐和图
Fig. 4. U-Pb concordia diagrams of zircon for biotite granodiorite (DA01/2) (a, b) and middle-coarse biotite granodiorite (DA06/1) (c, d) of the Daan granite
图 5 大安花岗岩体TAS(a)、K2O-Na2O(b)、SiO2-K2O(c) and A/NK-A/CNK(d)图解
图a据Rickwood(1989)，图b据Maniar and Piccoli(1989)，虚线代表Ⅰ型和S型花岗岩之间的边界(Chappell and White, 1992)
Fig. 5. TAS (a), K2O-Na2O (b), SiO2-K2O (c) and A/NK-A/CNK (d) diagrams for Daan granite
图 6 大安花岗岩体主要氧化物、微量元素Harker图解
Fig. 6. Harker plots of selected major and trace elements for the Daan granite
图 7 大安花岗岩体稀土元素球粒陨石标准化配分曲线图(a)和微量元素原始地幔标准化蛛网图(b)
球粒陨石标准化数据值引自Boynton(1984); 原始地幔标准化数据值引自Sun and McDonough(1989).埃达克岩据张旗等(2001)
Fig. 7. Chondrite-normalized REE patterns (a) and primitive mantle-normalized trace element spider diagram (b) for Daan granite
图 8 大安花岗岩体Sr/Y-Y图解(a)和Sr-Yb图解(b)
图a据Defant et al.(2002); 图b据张旗等(2008)；Ⅰ.埃达克岩；Ⅱ.喜马拉雅型花岗岩；Ⅲ.广西型花岗岩；Ⅳ.南岭型花岗岩
Fig. 8. Sr/Y-Y (a) and Sr-Yb (b) diagrams of Daan granite
图 9 大安花岗岩体岩石化学成分与变泥质岩、变杂砂岩、变角闪岩派生的实验熔体化学成分对比(a)和YbN-(La/Yb)N图解(b)
图a据Kaygusuz et al.(2008); 图b据Drummond and Defant(1990)
Fig. 9. Chemical content contrast between Daan granite and meta-mudstone-, greywacke-, meta-amphibolite-derived experimental melt (a) and YbN-(La/Yb)N diagram(b) of Daan granite
图 10 大安花岗岩体SiO2-lg[CaO/(K2O+Na2O)]图解(a)和R1-R2图解(b)
图a据Brown and Nordin(1982)；图b据Batchelor and Bowden(1985)
Fig. 10. SiO2-lg[CaO/(K2O+Na2O)] diagram (a) and R1-R2 diagram (b) of Daan granite
图 11 秦岭造山带中段印支期花岗岩年龄分布
底图据张成立等(2005)补充修改.数据来源：张宗清等(1999, 2006), 卢欣祥等(1999), 孙卫东和李曙光(2000), Sun et al.(2002), 王娟(2006), Zhang et al.(2006), 张宏飞等(2005, 2007), 弓虎军等(2009), 杨恺等(2009), 陈旭等(2009), 吴峰辉等(2009), 吕崧等(2010), 秦江锋等(2005), 秦江锋(2010), 骆金诚等(2010, 2011), 刘树文等(2011), Wang et al.(2011), Dong et al.(2012), 李佐臣等(2007, 2009, 2010, 2013), 孟旭阳等(2013), 刘春花等(2014), 吕星球等(2014), Deng et al.(2016), 韦龙猛等(2016), Lu et al.(2016), Ju et al.(2017); 杨阳(2017)
Fig. 11. Age distribution of Indosinian granites in the middle segment of the Qinling orogenic belt
表 1 大安花岗岩体与典型埃达克岩地球化学特征对比
Table 1. Comparison of geochemical characteristics of Daan granite and adakites
典型埃达克岩 大安花岗岩体 SiO2(%) ＞56 68.20 Al2O3(%) ＞15 16.43 K2O/Na2O ＜0.5 0.26 Sr(10-6) ＞400 766 Yb(10-6) ＜2 0.33 Y(10-6) ≤18 3.55 Mg# ＞47 35.66 Sr/Y ＞40 218 Zr/Sm ＞50 93 La/Yb ＞20 12.54 Eu异常 无Eu异常或Eu负异常不明显 弱负异常 Sr异常 正 正 注：据张旗等(2001). 
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