Implications to the Petrogenesis and Sn Mineralization of the Granite in the Tengshan’ao Sn deposit, the Nanling Metallogenic Belt
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摘要: 藤山坳锡矿床位于南岭成矿带大义山复式花岗岩体南部，具有大型规模潜力。在详细野外地质调查的基础上，本文以矿区分布的花岗岩为研究对象，进行了系统的岩相学、岩石地球化学、高精度LA-ICP-MS锆石U-Pb定年和Lu-Hf同位素测试。定年结果显示，细粒二云母二长花岗岩锆石U-Pb年龄为146.2±1.6 Ma（MSWD=2.2，n=18），与矿区细粒含斑二云母二长花岗岩年龄（158.2±1.2 Ma）相差约12 Ma，指示区内至少存在两期岩浆活动。矿区花岗岩富Si、Al、K，贫Ca、Mg，稀土元素具有四分组效应，ΣREE低（平均91.0×10-6）、δEu值极低（平均0.03），以及高FeOT/MgO值（平均16.8），10000×Ga／Al值（3.3~4.8）＞2.6等特征，总体显示为高分异的铝质A型花岗岩。岩石微量元素特征及部分锆石εHf(t)值（-3.88~6.54）为正值等表明成岩岩浆具有壳幔物质混合来源的特点，形成于板内伸展构造环境，具有较好的锡多金属成矿潜力。Abstract: The Tengshan’ao Sn deposit, located in the south of the Dayishan Granitic Complex in the Nanling metallogenic belt, provides large-scale potential. Based on a detailed geological survey, the granites of the mining area have been systematically studied on petrography, geochemistry, zircon U-Pb dating, and Lu-Hf isotope in this paper. The results show that the age of the fine-grained two-mica monzonitic granite is 146.2±1.6 Ma, about 12 Ma away from that of the fine-grained two-mica monzonitic granite (158.2±1.2 Ma) containing phenocryst, indicating that at least two stages of magmatic intrusion have occurred in the mining area. The granites have consistent litho-geochemistry characteristics, which are rich in silicon, aluminum, and potassium, poor in calcium and magnesium with a low ΣREE content(average 91.0×10-6), and an REE pattern showing an obvious tetrad effect and a strong negative Eu anomaly (the δEu average is 0.03). A combination of the characteristics of high FeOT/MgO ratios (average 16.8) and the 10000×Ga/Al values (3.3-4.8) above 2.6, it is presumed to be the highly differentiated and aluminous A-type granite. The characteristics of trace elements and some of the zircon εHf(t) values (-3.88-6.54) are positive, indicating that the diagenetic magma is of mixed origin of crust-mantle materials, and has been formed in an extensional tectonic environment within the plate, which is in favor of the tin polymetallic mineralization.
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