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地质学报  2011 

赣南晚侏罗世九龙脑钨锡铅锌矿集区不同成矿类型花岗岩年龄、地球化学特征对比及其地质意义

, PP. 1188-1205

Keywords: SHRIMP锆石U-Pb年龄,地球化学,Sr-Nd同位素,锆石Hf同位素,九龙脑,淘锡坑石英脉型钨矿,宝山矽卡岩型铅锌矿,晚侏罗世,华南

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Abstract:

九龙脑花岗岩体位于南岭东部,它周围分布着众多钨、锡和铅锌矿床(点)。本文选择岩体北侧淘锡坑石英脉型钨矿、东侧宝山矽卡岩型铅锌矿底部的隐伏花岗岩,对比九龙脑岩体开展了成岩年代学、地球化学、Sr-Nd同位素研究。上述岩体的SHRIMP锆石U-Pb年龄分别是158.7±3.9Ma、157.7±2.7Ma、154.9±2.2Ma,形成年龄在误差范围内一致,为晚侏罗世产物。SiO2含量较高(69.67%~76.99%),Al2O3=12.41%~14.32%,A/CNK=1.00~1.37,属于准铝-弱过铝质高钾钙碱性花岗岩类,宝山矿区隐伏花岗岩的TiO2、CaO、TFe2O3、FeO、LOI含量相对偏高。九龙脑花岗岩、淘锡坑隐伏花岗岩和宝山隐伏花岗岩的εNd(t)值分别为-10.5~-9.1,-10.6~-10.2,-9.4~-8.6,t2DM值分别为1.84~1.63Ga、1.78~1.74Ga、1.61~1.54Ga,低于华夏地块大部分地区基底岩石(2.2~1.8Ga)和华南典型S型花岗岩(1.8Ga)的Nd模式年龄。三个岩体均为古-中元古代地壳物质熔融产物,九龙脑岩体兼具淘锡坑和宝山花岗岩的两种特征,后者在成岩过程中基性组份参与的程度更高。幔源物质的加入可能与中生代地壳拉张减薄作用有关,而地幔物质的上涌对华南地区一些重要金属矿床的形成起了重要作用。

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