秦岭山阳-柞水地区燕山期中酸性侵入岩地球化学特征、锆石U-Pb年龄及Lu-Hf同位素组成
Geochemical characteristics, zircons U-Pb ages and Lu-Hf isotopic composition of the Yanshanian intermediate-acidic plutons in the Shanyang-Zhashui areas, Qinling Orogenic Belt.
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摘要: 秦岭山阳-柞水地区广泛出露燕山期中酸性花岗（斑）岩体，并有大量与其相关的斑岩-矽卡岩型Cu-Mo-Fe、Cu-Au-Fe矿化。LA-ICP-MS锆石U-Pb测年结果表明，与矿化密切相关的斑岩体形成于144.6~141.5Ma。岩石地球化学分析结果表明，这些花岗（斑）岩体SiO2含量为55.73%~67.80%，K2O含量为2.52%~6.40%，Na2O含量为1.94%~5.19%，Al2O3含量为14.61%~16.10%，FeOT含量为2.1%~9.0%，MgO含量为1.32%~5.52%，主体显高钾钙碱性准铝质特征。A/CNK2O5与SiO2负相关，Mg#平均为49，含有角闪石、黑云母、榍石、磁铁矿等矿物，属I型花岗岩类；稀土元素分异明显，无明显Eu异常；富集K、Rb、Sr、Ba等大离子亲石元素，Nb、Ta、Ti、P和Hf等高场强元素亏损，属后碰撞型花岗岩。岩体的锆石εHf（t）为-4.5~+1.78，平均为-0.87，表明其岩浆源区为地壳物质的熔融岩浆与幔源岩浆的混合，且以地壳熔融成份为主；Hf同位素二阶段模式年龄（tDM2）为1479~1084Ma，表明其壳源源区物质可能形成于中晚元古代（1.4~1.0Ga）。Abstract: A large number of Yanshanian intermediate-acidic granite (porphyry) are widely exposed in the Shanyang-Zhashui region, Qinling, and among of them are associated porphyry-skarn Cu-Mo-Fe and Cu-Au-Fe mineralization. LA-ICP-MS zircon U-Pb ages reveal porphyry bodies are formed in the 144.6~141.5Ma. Geochemical analysis results showing that intermediate-acidic granite (porphyry) have SiO2=55.73%~67.80%, K2O=2.52%~6.40%, Na2O=1.94%~5.19%, Al2O3=14.61%~16.10%, FeOT=2.1%~9.0% and MgO=1.32%~5.52%, proving that they belong to high-K calc-alkaline granites. A/CNK2O5 and SiO2, Mg# average values 49 and mineral ingredients (hornblende, biotite, sphenes and magnetite), all of these reveal the characteristics of I-type granites. REE fractionation obviously, no manifest Eu anomaly, enriched in large ion lithophile elements, such as K, Rb, Sr and Ba, and depleted in high field strength elements, e.g. Nb, Ta, Ti, P and Hf, show that they belong to post-collision granites. Zircon εHf(t) range from -4.5 to +1.78 (average -0.87), indicating that the magma may sourcing from subducted mafic crustal material mixing with mantle material, and crustal melting are main ingredients. Hf isotopes two-stage model ages (tDM2), 1479~1084Ma, indicated its crustal source is formed in Middle to Late Proterozoic (ca. 1.4~1.0Ga).
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Key words:
- Granite /
- Zircons U-Pb ages /
- Lu-Hf isotope /
- Yanshanian /
- Shanyang-Zhashui
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