Zircon U-Pb Ages, Hf Isotopes and Geological Significance of Mesozoic Granites in Dandong Area, Liaodong Peninsula
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摘要: 为了确定辽东半岛丹东地区中生代花岗岩岩石类型、成岩时代及其形成构造背景.选取三股流岩体、五龙背岩体和丁岐山岩体开展岩相学、锆石LA-ICP-MS U-Pb年代学、岩石地球化学和锆石Hf同位素地球化学研究.结果表明:三股流岩体由花岗闪长岩、似斑状黑云母二长花岗岩和中粗粒黑云母二长花岗岩组成,后两者成岩年龄分别为137.2±1.2 Ma和123.2±1.3 Ma;丁岐山岩体由中细粒碱长花岗岩、石英正长岩和石英二长岩组成,获得中细粒碱长花岗岩成岩年龄为121.1±1.5 Ma;五龙背岩体由中粗粒二长花岗岩组成,成岩年龄为146.8±0.8 Ma.元素和同位素地球化学特征表明,三股流岩体的花岗闪长岩为钾玄岩系列,似斑状黑云母二长花岗岩和中粗粒黑云母二长花岗岩以及五龙背岩体和丁岐山岩体均为高钾钙碱性,3个岩体不同岩石类型的A/CNK均小于1.1,为I型花岗岩;岩体均富集轻稀土元素和大离子亲石元素,亏损重稀土元素和高场强元素,具Eu负异常;εHf(t)值为-22.40~-9.77,两阶段Hf模式年龄TDM2为2 999~1 915 Ma,揭示三股流岩体、五龙背岩体和丁岐山岩体可能是古元古代古老地壳部分熔融形成.结合区域构造演化认为三股流岩体、五龙背岩体和丁岐山岩体均形成于活动大陆边缘,五龙背岩体形成于古太平洋板块向欧亚板块的俯冲挤压的构造背景,三股流岩体和丁岐山岩体形成于古太平洋板块向欧亚板块的俯冲后的伸展环境.Abstract: In order to determine the rock types, petrogenic age and tectonic setting of the Mesozoic granites from the Dandong area in Liaodong peninsula, the lithology identification, zircon LA-ICP-MS U-Pb dating, major and trace elements, and Hf isotope data for the Sanguliu, Wulongbei and Dingqishan granites are presented in this paper. The LA-ICP-MS U-Pb ages of the Sanguliu pluton of the porphyritic biotite monzogranite and the medium-coarse grained biotite monzogranite are 137.2±1.2 Ma and 123.2±1.3 Ma. The LA-ICP-MS U-Pb geochronology of the Wulongbei medium-fine grained biotite monzogranite and Dinqishan alkali feldspar granite are 146.8±0.8 Ma and 121.1±1.5 Ma.The results of elemental and isotope geochemistry show that the Sanguliu granodiorite belong to shoshonite series, while the porphyritic biotite monzogranite and the medium-coarse grained biotite monzogranite, the Wulongbei medium-fine grained biotite monzogranite and Dinqishan alkali feldspar granite belong to high potassium Ca-alkaline series. Their aluminum indexes (A/CNK ratios) are all less than 1.1, showing the special feature of I-type granite. The samples of the Sanguliu, Wulongbei and Dingqishan granites are enriched in LREE and LILE, but depleted in HREE and HFSE with minor negative Eu anomalies. The zircon εHf(t) values of the three pluton are from -22.40 to -9.77, TDM2 are between 2 999 and 1 915 Ma, suggesting that the Sanguliu, Wulongbei and Dingqishan granites were mainly derived from the partial melting of the Paleoproterozoic crustal material. Combined with regional tectonic evolution, it is proposed that the Sanguliu, Wulongbei and Dinqishan rock plutonic diagenetic tectonic environment is the active continental margin, the Wulongbei rock may be formed in the compression tectonic environment and the Sanguliu rock and Dinqishan rock may be formed in the extension tectonic environment, which is closely associated with the subduction of the Paleo-Pacific plate.
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Key words:
- Sanguliu pluton /
- Wulongbei pluton /
- Dinqishan pluton /
- zircon U-Pb /
- geochemistry /
- Dandong area of Liaodong peninsula /
- petrology
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图 4 辽东半岛丹东地区花岗岩的SiO2-Na2O+K2O(a),SiO2-K2O(b)和A/CNK-A/NK(c)图解
图a据Le Maitre et al.(1989); 图b据Rickwood(1989); 图c据Maniar and Piccoli(1989)
Fig. 4. Plots of SiO2-Na2O+K2O (a), SiO2-K2O (b) and A/CNK-A/NK(c) for granite rocks in Dandong, Liaodong peninsula
图 5 辽东半岛丹东地区花岗岩的稀土配分曲线(a,c,e,g,i)和微量蛛网图(b,d,f,h)
Fig. 5. Rare earth element distribution curves (a, c, e, g, i) and trace element spider diagrams (b, d, f, h) for granite rocks in Dandong, Liaodong peninsula
图 8 辽东半岛花岗岩的锆石Lu-Hf同位素特征图解
Fig. 8. Lu-Hf diagram of the granite rocks of Dingqishan rocks in Dandong, Liaodong peninsula
图 9 丹东地区花岗岩成因类型判别图(Zr+Nb+Ce+Y)-(K2O+Na2O) (a); (Zr+Nb+Ce+Y)-(FeOT/MgO) (b); 10 000Ga/Al-Zr; (d) 10 000Ga/Al-Nb(c)
FG.分异的I型、S型花岗岩分布区; OGT. I型、S型、M型花岗岩分布区;图a~d据Whalen et al.(1987)
Fig. 9. Granite genesis and type discrimination diagrams (Zr+Nb+Ce+Y)-(K2O+Na2O) (a), (Zr+Nb+Ce+Y)-(FeOT/MgO) (b), 10 000Ga/Al-Zr (c); 10 000Ga/Al-Nb(d)
图 10 丹东地区花岗岩Rb /30-Hf-3Ta三元图解(a)和Rb-(Y+Nb)图解(b)
图a据Harris et al.(1986);图b据Pearce et al.(1984)
Fig. 10. Rb/30-Hf-3Ta diagram(a); Rb-(Y+Nb) diagram(b)
表 1 辽东半岛丹东地区花岗岩岩相学基本特征
Table 1. Petrographic features of granite rocks in Dandong, Liaodong peninsula
岩石名称 采样位置 组构和矿物组成 备注 三股流花岗闪长岩 124°13′42″E、40°06′14″N 中粗粒花岗结构,块状构造;粒度一般在3.5~6.0 mm, 个别2.5~3.0 mm;斜长石(50%)(An=36)、钾长石(20%)、石英(20%)、黑云母(5%)、角闪石(5%),副矿物为磷灰石、磁铁矿、锆石、褐帘石、榍石等 图 3a~3b 三股流似斑状黑云母二长花岗岩 124°15′20″E、40°05′54″N 似斑状结构,基质为中粒花岗结构,块状构造;粒度一般在2.8~10.0 mm, 少量0.5~1.5 mm, 个别1.6~2.0 mm;斜长石(30%)(An=22)、钾长石(30%)、石英(25%)、黑云母(10%)、角闪石(5%),副矿物为磷灰石、磁铁矿、锆石、褐帘石、榍石等 图 3c~3d 三股流中粗粒二长花岗岩 124°14′45″E、40°06′15″N 中粗粒花岗结构,块状构造;粒度一般在0.6~2.8 mm, 个别4.0~6.3 mm;斜长石(30%)(An=22)、钾长石(25%)、石英(30%)、黑云母(10%)、角闪石(5%),副矿物为磷灰石、磁铁矿、锆石、褐帘石、榍石等 图 3e~3f 五龙背岩体中粗粒二长花岗岩 124°16′30″E、40°16′45″N 中粗粒花岗结构,块状构造;粒度一般在0.6~2.8 mm, 个别4.0~6.3 mm;斜长石(30%)、钾长石(35%)、石英(30%)、黑云母(5%),副矿物为磷灰石、锆石、褐帘石、榍石等 图 3g~3h 丁岐山岩体中细粒碱长花岗岩 124°21′49″E、40°17′29″N 中细粒花岗结构,块状构造;粒度一般在0.3~0.6 mm, 少量0.7~0.8 mm, 个别3~5 mm以上;条纹长石(55%)、斜长石(5%)(An=15±)、石英(30%)、黑云母(5%),副矿物为磷灰石、锆石、磁铁矿、榍石等 图 3i~3j -
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