Genesis and tectonic implications of Caledonian Dayekou adakite diorite porphyry of Xishui area, Zoulangnanshan, North Qilian Mountain
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摘要:
北祁连走廊南山北坡西水地区的加里东期大野口岩体中闪长玢岩地球化学的研究表明，该套岩石的SiO2 > 56%，Al2O3 > 15%，Na2O > K2O，富集大离子亲石元素和轻稀土元素，具正Eu异常，富集Sr元素、亏损重稀土元素Yb和Y，具有较高的Sr/Y值，表现出明显的埃达克岩的地球化学性质。结合岩体产出的时空位置，认为大野口岩体形成于奥陶纪与板块俯冲作用相关的俯冲洋壳部分熔融和壳幔岩浆混合作用。
Abstract:Geochemical studies of diorite porphyrite in Xishui area of Zoulangnanshan within North Qilian Mountain show that the rock is characterized by SiO2 > 56%, Al2O3 > 15%, Na2O > K2O%, LILE and LREE enrichment, positive Eu anomalies, Sr enrichment, depletion of heavy rare earth elements Yb and Y, and higher Sr/Y ratios, showing obvious geochemical characteristics of adakite. Ac-cording to the regional geological study, the authors hold that Dayekou diorite porphyrite was formed in the Caledonian Ordovician period associated with subduction of the oceanic crust partial melting and crust-mantle magma mixing.
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Keywords:
- adakite /
- Dayekou diorite porphyry /
- petrogenesis /
- Zoulangnanshan /
- North Qilian
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致谢: 野外地质调查和写作过程中得到中国地质调查局西安地质调查中心余吉远、孟勇高级工程师，朱晓辉、过磊、孙吉明工程师，以及甘肃省第四地勘院张敏、徐沛斌、成锐工程师的帮助，在此一并致以感谢。
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图 1 北祁连山西水—大野口地区地质略图（据参考文献[18-19]修改）
Q41apl—第四系冲洪积砾石层；Q3—第四系疏松黄土；N2s—古近系-新近系疏勒河组；C2y—上石炭统羊虎沟组；C1c—下石炭统臭牛沟组；D1-2l—泥盆系老君山组；O2ZH—中奥陶统中堡群；O1Y—下奥陶统阴沟群；1—花岗闪长岩；2—花岗斑岩脉；3—花岗岩脉；4—闪长玢岩；5—次安山岩；6—次斜长流纹岩；7—次玄武岩；8—辉绿岩；9—角度不整合；10—侵入接触；11—断层；12—产状；13—采样位置
Figure 1. Geological map of Xishui-Dayekou area, North Qilian Mountain
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图 2 大野口岩体中闪长玢岩野外露头和显微照片
Hb—角闪石；Pl—斜长石；Py—黄铁矿
Figure 2. Outcrop photo and microphotograph of Dayekou diorite-porphyrite
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图 4 大野口岩体中闪长玢岩稀土元素配分模式（a）和微量元素原始地幔标准化蛛网图（b）
(球粒陨石标准化值和原始地幔标准化值据参考文献[25])
Figure 4. Chondrite-normalized REE patterns (a) and primitive mantle-normalized trace element patterns (b) of Dayekou diorite porphyry
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图 5 大野口闪长玢岩Y-Sr/Y（a）和YbN-（La/Yb）N图（b）（底图均据参考文献[26]）
Figure 5. Sr/Y versus Y(a) and chondrite-normalized La/Yb ratios versus chondrite-normalized Yb abundances(b) in Dayekou diorite porphyry
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图 6 大野口岩体中埃达克质闪长玢岩与玄武岩实验溶体SiO2-MgO图解[42]
Figure 6. SiO2-MgO diagram for adakite and experimental melts of the basalts of Dayekou intrusive body
表 1 大野口岩体中闪长玢岩主量、微量和稀土元素分析结果
Table 1 Major, trace elements and REE composition of Dayekou diorite porphyry
样品名称 PM009-8-1H PM009-8-2H PM009-8-3H PM009-8-4H PM009-8-5H PM009-8-6H SiO2 57.84 58.41 57.84 58.41 58.01 59.14 TiO2 0.44 0.45 0.44 0.42 0.45 0.42 Al2O3 17.62 17.85 17.32 17.22 17.77 17.53 FeO 3.72 3.68 3.65 3.28 3.5 3.25 Fe2O3 3.26 3.32 3.21 3.22 3.44 3.32 MnO 0.17 0.17 0.16 0.16 0.16 0.14 MgO 3.36 3.42 3.44 2.99 3.22 3.06 CaO 5.45 4.81 4.43 4.52 5.44 2.96 Na2O 3.91 3.96 4.07 3.95 4.01 4.56 K2O 0.85 0.91 1.22 1.66 0.84 1.78 P2O5 0.14 0.14 0.14 0.14 0.14 0.14 烧失量 3.16 2.81 4.00 3.97 2.94 3.62 H2O+ 2.28 2.14 2.86 2.56 2.26 2.51 总和 102.2 102.07 102.78 102.5 102.18 102.43 A/CNK 1.02 1.10 1.08 1.04 1.02 1.18 Mg# 47.37 47.76 48.40 46.32 46.53 46.65 Na2O/K2O 4.60 4.35 3.34 2.38 4.77 2.56 σ 1.53 1.54 1.89 2.04 1.57 2.49 Cr 36.6 11.7 15.5 9.68 7.79 7.28 Ni 28.6 12.1 10.2 8.85 8.85 7.44 Rb 31.60 23.90 38.7 54.5 19.1 63.9 Ba 1120.00 358 354 260 238 242 Th 2.14 1.70 1.77 1.82 1.73 1.78 U 0.56 0.53 0.53 0.52 0.51 0.52 Nb 1.74 1.50 1.42 1.51 1.49 1.50 Ta 0.17 0.14 0.14 0.15 0.15 0.14 La 10.40 8.22 8.94 8.19 8.43 8.28 Ce 22.6 18.5 19.9 18.0 18.6 17.8 Pr 2.95 2.52 2.58 2.40 2.48 2.44 Sr 460.0 433.0 360.0 332.0 418.0 409.0 Nd 11.8 10.5 11.0 10.0 10.9 10.1 Zr 68.8 66.9 69.2 71.60 68.9 69.3 Hf 2.11 1.96 1.99 2.07 2.02 2.10 Sm 2.57 2.32 2.40 2.28 2.44 2.36 Eu 1.03 0.88 0.86 0.79 0.84 0.78 Gd 2.42 2.21 2.23 2.12 2.24 2.04 Tb 0.40 0.36 0.40 0.35 0.38 0.34 Dy 2.40 2.17 2.26 2.11 2.22 2.02 Y 13.50 12.60 12.30 12.20 12.90 11.90 Ho 0.48 0.44 0.45 0.44 0.46 0.42 Er 1.37 1.30 1.28 1.23 1.36 1.22 Tm 0.22 0.20 0.20 0.20 0.22 0.19 Yb 1.50 1.40 1.39 1.30 1.52 1.34 Lu 0.22 0.22 0.23 0.21 0.24 0.22 δEu 1.24 1.17 1.12 1.08 1.08 1.06 Sr/Y 34.07 34.37 29.27 27.21 32.40 34.37 注：主量元素含量单位为%，微量和稀土元素含量为10-6 
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