Zircon U-Pb Chronology, Geochemistry of Jiangjunmu Ore-Bearing Pluton, Eastern Part of East Kunlun and Their Geological Significance
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摘要: 将军墓含矿花岗闪长斑岩位于东昆仑造山带东段.通过岩石地球化学、锆石U-Pb年代学、Lu-Hf同位素研究,结果表明,含矿花岗闪长斑岩LA-ICP-MS锆石U-Pb年龄为218.8±1.3 Ma,形成于晚三叠世.含矿花岗闪长斑岩SiO2含量为65.23%~67.25%,MgO含量1.50%~1.59%,Al2O3含量15.30%~15.75%,K2O/Na2O比值1.00~1.20,Mg#值43~44.表现富硅、富铝、富钾特征,显示高钾钙碱性系列;岩石具有轻重稀土分馏和轻稀土富集及负Eu异常特征,富集大离子亲石元素(LILE),如Th、U、Rb、K;亏损高场强元素(HFSE),如Nb、P、Zr等;锆石εHf(t)=-1.7~+1.01,TDM2=1 064~1 214 Ma,反映源区主体为中元古代下地壳.综合年代学、岩石学和地球化学证据,显示将军墓含矿花岗闪长斑岩源于中元古代下地壳重熔,并有少量地幔岩浆加入而发生不完全混合,含少量暗色微粒包体的含矿岩石.将军墓含矿花岗闪长斑岩形成于东昆仑晚三叠世碰撞后伸展环境,是东昆仑晚三叠世壳幔相互作用成岩-成矿的体现.该岩体不仅仅是东昆仑古特提斯构造岩浆事件的产物,同时具备良好的成矿条件,为东昆仑晚三叠世岩浆作用研究和寻找与之有关的斑岩型或热液型多金属矿床提供重要的证据.
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关键词:
- 东昆仑东段 /
- 将军墓含矿花岗闪长斑岩 /
- 锆石U-Pb年龄 /
- 暗色微粒包体 /
- 岩石学
Abstract: Jiangjunmu ore-bearing granodiorite porphyry is located in the eastern part of East Kunlun orogenic belt. In this paper,zircon U-Pb dating and Lu-Hf isotopes,whole-rock major and trace elements of ore-bearing granodiorite porphyry are presented to discuss their geochronology and genesis. The results show that the ore-bearing granodiorite porphyry was formed at the Late Triassic with the age of 218.8±1.3 Ma. It has contents of SiO2(65.23%-67.25%),MgO(1.50%-1.59%),Al2O3(15.30%-15.75%) with K2O/Na2O ratios ranging from 1.00 to 1.20 and Mg# values ranging from 43 to 44. The ore-bearing granodiorite porphyries are characterized by high silicon,aluminum and high-potassium,belonging to the high-potassium rock. Meanwhile,they are enriched in large ion lithophile elements (LILEs) such as Th,U,Rb and K,and depleted in high field strength elements (HFSE) such as Nb,P and Zr. Hf isotopic compositions of the ore-bearing granodiorite porphyry (εHf(t)=-1.7-+1.01,TDM2=1 064-1 214 Ma),indicating that their parental magmas were derived from the Middle Proterozoic lower crust. Coupled with the petrography of a small number of mafic microgranular enclaves,geochronology,petrology and geochemistry data indicate that ore-bearing granodiorite porphyry originated from the mixing of dominating re-melting of Middle Proterozoic lower crust and a small amount of mantle-derived materials. The ore-bearing granodiorite porphyry was formed in the post-collisional orogenic extensional setting,indicative of the crust-mantle diagenesis and mineralization at Late Triassic in the East Kunlun. It is not only the product of the Paleo-Tethys tectonic and magmatic event in the East Kunlun,but also has good metallogenic conditions,which provides important evidence for the study of the Late Triassic magmatism in the East Kunlun and search for porphyry or hydrothermal polymetallic deposits. -
图 1 中国大地构造格架示意图(a);东昆仑造山带示意图(b);东昆仑三叠纪矿花岗岩类年龄统计直方图(c);东昆仑地区岩浆岩分布简图(d)
图a底图基于国家测绘地理信息局标准地图服务网站下载的审图号为GS(2019)1675号的标准地图制作,底图无修改;,图b,d底图引自Hu et al.(2016);图c数据张炜等(2016)、丰成友等(2012)、张明东等(2018)
Fig. 1. Outline of the geological framework of China(a); schematic geological map of the East Kunlun orogenic belt (EKB) (b); age histogram of granitoids at the Triassic in the East Kunlun(c); Simplified distribution map of magmatic rocks along the East Kunlu(d)
图 5 将军墓花岗闪长斑岩SiO2-(Na2O+K2O)图解(a)、SiO2-K2O图解(b)和A/CNK-A/NK图解(c)
图a据Middlemost(1994);图b据Peccerillo and Taylor(1976);图c据Maniar and Piccolio(1989)
Fig. 5. Diagrams of SiO2-(Na2O+K2O)(a), SiO2-K2O(b) and A/CNK-A/NK(c) of Jiangjunmu granodiorite porphyry
图 6 将军墓花岗闪长斑岩及暗色微粒包体稀土球粒陨石标准化配分曲线和原始地幔标准化蛛网图解
球粒陨石和原始地幔数据引自Sun and McDonough(1989)
Fig. 6. Chondrite-normalized rare earth elements pattern and primitive mantle-normalized elements spider diagram of Jiangjunmu granodiorite porphyry and MME
图 7 将军墓花岗闪长斑岩MgO-FeOT图解(a)和SiO2-A/CNK图解(b)
图a底图据朱玉娣等(2014);图b底图据Zorpi et al. (1989)
Fig. 7. MgO-FeOT diagram (a) and SiO2-A/CNK diagram (b) of Jiangjunmu granodiorite porphyry
图 9 将军墓花岗闪长斑岩YbN-(La/Yb)N图解
底图据Defant and Drummond(1990),球粒陨石标准化数据引自Sun and McDonough (1989)
Fig. 9. YbN-(La/Yb)N diagram of Jiangjunmu granodiorite porphyry
图 10 将军墓花岗闪长斑岩Cr- Ni图解(a)和(La/Yb)N -Sr/Y图解(b)
图a据Wang et al.(2006);图b据Liu et al.(2010)和Ling et al.(2013). (La/Yb)N球粒陨石标准化数据根据Sun and McDonough (1989)
Fig. 10. Cr- Ni diagram (a) and (La/Yb)N -Sr/Y diagram (b) of Jiangjunmu granodiorite porphyry
图 11 将军墓花岗闪长斑岩La/Yb-La (a)和CaO-Sr (b)图解
图a据Furman and Graham(1999);图b底图据He et al.(2011)
Fig. 11. La/Yb-La (a) and CaO-Sr (b) diagram of Jiangjunmu granodiorite porphyry
图 12 将军墓花岗闪长斑岩R1-R2图解
Fig. 12. R1-R2 diagram of Jiangjunmu granodiorite porphyry
表 1 将军墓花岗闪长斑岩和暗色微粒包体主微量元素地球化学分析数据
Table 1. Whole rock major and trace element contents of Jiangjunmu granodiorite porphyry and MME
样品编号 Jjm-01 Jjm-02 Jjm-03 Jjm01-1 Jjm01-2 Jjm01-3 Jjm01-4 Jjm01-5 Jjm01-6 Jjm01-7 Jjm01-8 Jjm01-9 岩石类型 暗色微粒包体(MME) 花岗闪长斑岩 SiO2 57.19 57.29 54.98 65.50 65.84 65.58 65.82 65.23 65.25 66.31 66.54 67.25 TiO2 0.76 0.77 1.20 0.67 0.65 0.68 0.66 0.68 0.69 0.63 0.60 0.63 Al2O3 17.33 17.75 17.51 15.35 15.31 15.47 15.42 15.3 15.45 15.44 15.47 15.75 TFeO 6.82 7.36 8.39 4.07 4.04 4.07 4.06 4.13 4.14 3.93 3.82 3.95 MnO 0.13 0.14 0.17 0.07 0.07 0.07 0.07 0.07 0.07 0.07 0.06 0.07 MgO 2.93 3.09 3.42 1.59 1.56 1.58 1.56 1.58 1.55 1.54 1.50 1.55 CaO 2.77 2.09 2.99 2.29 2.54 2.31 2.37 2.26 2.31 2.36 2.29 2.32 Na2O 4.63 4.72 5.43 3.69 3.40 3.58 3.60 3.67 3.72 4.03 4.07 4.04 K2O 4.58 4.47 4.27 4.17 4.06 4.10 4.12 4.19 4.22 4.04 4.10 4.12 P2O5 0.16 0.16 0.23 0.14 0.14 0.14 0.14 0.15 0.15 0.15 0.14 0.15 LOI 3.31 2.74 2.10 2.46 2.43 2.30 2.24 2.47 2.39 2.14 2.11 2.45 SUM 100.61 100.58 100.69 99.99 100.04 99.88 100.06 99.73 99.94 100.64 100.70 102.28 Mg# 46 46 45 44 44 44 43 43 43 44 44 44 Li 69.17 77.09 86.69 56.40 60.80 58.94 60.31 51.84 53.51 53.49 51.48 52.67 Be 2.15 2.33 2.51 2.24 2.63 2.39 2.53 2.21 2.3 2.35 2.22 2.32 Sc 22.11 22.79 17.59 6.98 7.93 7.65 7.70 7.72 7.61 7.70 7.55 8.45 V 94.39 97.65 74.04 39.33 39.03 41.15 41.37 40.86 40.60 41.66 39.20 40.84 Cr 58.98 63.65 23.61 7.15 8.24 7.34 7.59 8.87 7.95 11.56 8.90 8.76 Co 30.45 23.30 24.32 32.38 23.80 26.73 23.22 32.31 29.01 24.57 25.43 26.24 Ni 3.75 3.83 3.65 2.53 2.34 2.47 2.39 2.78 2.62 2.16 2.38 2.42 Cu 25.21 35.72 6.31 11.07 12.79 6.42 6.48 3.91 5.41 5.17 6.52 5.50 Zn 319.50 429.55 197.43 82.53 72.50 72.52 73.99 73.39 74.76 72.15 68.70 73.99 Ga 24.92 26.71 28.60 20.06 20.67 21.48 21.77 20.6 20.69 20.20 19.79 19.80 Rb 173.22 172.37 51.64 204.71 202.81 204.94 210.74 190.16 200.27 183.69 182.36 183.20 Sr 354.6 341 567.98 482.62 463.59 482.34 483.65 457.85 500.44 319.02 326.65 331.47 Y 45.95 50.08 16.43 19.93 21.93 20.82 20.07 20.39 21.20 19.47 18.93 19.16 Zr 141.91 142.99 240.02 207.83 215.00 207.26 224.70 194.62 217.88 196.44 195.99 208.52 Nb 15.24 15.39 18.97 14.77 14.78 15.30 15.51 14.98 15.02 13.90 13.56 13.91 Sn 2.17 2.22 1.25 2.69 1.86 2.31 2.70 2.19 2.34 2.18 2.23 2.22 Cs 6.05 6.49 13.11 7.78 12.77 10.49 9.89 7.04 7.70 4.26 4.31 4.40 Ba 676.39 632.45 233.36 773.58 728.22 741.27 765.04 819.96 785.65 607.64 640.9 624.33 Lu 0.53 0.58 0.23 0.21 0.23 0.21 0.21 0.21 0.21 0.23 0.24 0.25 Hf 4.87 4.73 6.46 5.74 5.89 5.68 6.09 5.34 5.91 5.87 6.08 6.48 Ta 1.32 1.27 1.48 1.07 1.05 1.08 1.09 1.07 1.04 1.23 1.32 1.29 Tl 0.90 0.88 0.26 1.08 1.06 1.04 1.15 1.11 1.12 0.82 0.90 0.91 Pb 33.84 43.6 18.75 24.90 24.35 25.67 25.37 23.9 23.99 18.59 20.04 19.89 Th 15.26 14.21 8.23 25.83 27.30 28.69 28.99 26.03 26.51 25.05 27.12 24.88 U 2.64 2.48 2.33 3.19 3.44 3.40 3.50 3.37 3.35 2.76 2.92 2.84 La 42.37 41.99 32.14 54.50 54.60 62.70 59.50 54.50 56.70 51.70 53.57 48.58 Ce 108.18 110.14 65.43 105.00 104.00 119.00 113.00 104.00 108.00 107.24 109.82 98.97 Pr 15.38 16.13 8.07 11.60 11.90 13.20 12.50 11.80 12.10 11.97 12.21 11.18 Nd 68.94 71.47 31.88 42.30 43.30 46.8 44.70 43.00 43.80 44.01 44.98 42.30 Sm 16.32 17.16 6.29 7.90 8.08 8.61 8.22 8.00 8.07 8.30 8.35 7.95 Eu 1.86 1.90 1.15 1.21 1.16 1.20 1.20 1.25 1.19 1.18 1.25 1.25 Gd 13.25 13.51 4.85 5.62 5.85 6.05 5.87 5.84 5.72 5.96 5.75 5.68 Tb 1.88 1.97 0.67 0.76 0.83 0.82 0.77 0.77 0.77 0.79 0.80 0.79 Dy 10.77 11.05 3.55 4.11 4.33 4.17 3.97 4.18 4.19 4.20 4.32 4.24 Ho 1.86 1.95 0.63 0.68 0.74 0.72 0.66 0.68 0.70 0.71 0.73 0.74 Er 4.92 5.05 1.72 1.87 2.07 1.91 1.88 1.93 2.02 1.90 1.90 1.89 Tm 0.64 0.68 0.24 0.24 0.25 0.25 0.23 0.23 0.23 0.26 0.26 0.26 Yb 3.90 4.17 1.54 1.54 1.61 1.52 1.56 1.63 1.60 1.65 1.71 1.71 ΣREE 290.79 297.76 158.39 237.54 238.95 267.16 254.27 238.02 245.3 240.11 245.90 225.77 LREE 253.05 258.79 144.97 222.51 223.04 251.51 239.12 222.55 229.86 224.40 230.19 210.22 HREE 37.75 38.97 13.42 15.03 15.91 15.65 15.15 15.47 15.44 15.71 15.71 15.55 LREE/HREE 6.70 6.64 10.80 14.80 14.02 16.07 15.78 14.39 14.89 14.29 14.65 13.52 (La/Yb)N 7.80 7.22 14.96 25.38 24.33 29.59 27.36 23.98 25.42 22.48 22.51 20.42 δEu 0.38 0.37 0.61 0.53 0.49 0.48 0.50 0.53 0.51 0.49 0.52 0.54 δCe 1.04 1.04 0.97 0.97 0.96 0.96 0.97 0.96 0.96 1.02 1.01 1.00 注:主量元素单位为%;微量和稀土元素单位为10-6;Mg#=Mg2+/(Mg2++Fe2+);(La/Yb)N标准化数据引自Sun and McDonough (1989). -
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