桂东北平乐县沙子煌斑岩LA-ICP-MS锆石U-Pb年龄及Hf同位素组成
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摘要
桂东北平乐县位于华南地区的南侧,南岭成矿带的西段,中生代岩浆活动频繁。利用LA-ICP-MS法对桂东北平乐县沙子煌斑岩进行了锆石U-Pb同位素定年,结合前人资料得到沙子煌斑岩的侵位年龄晚于163 Ma。结合已有对华南地区燕山期成岩成矿作用的研究,认为桂东北平乐县沙子煌斑岩为燕山早期的产物,与华南中-晚侏罗世形成的大量花岗岩可能形成于同一次岩浆热事件;华南在中-晚侏罗世仍为伸展状态;对沙子煌斑岩的锆石进行Hf同位素分析显示,其ε_(Hf)(t)值范围为-29.55～12.81、T_(DM2)值为3.95～1.00 Ga,研究区很可能存在古太古代-古元古代的隐藏地壳。
In the western Nanlingmetallogenic belt of South China, the Mesozoic magmatism is widely distributed in Pingle. This study reports the LA-ICP-MS zircon U-Pb age for the lamprophyres from Shazi in Pingle, Northeastern Guangxi and suggests that the formation age of the lamprophyres is younger than 163 Ma. Combined with the previous studies on the Yanshanian diagenesis and mineralization in South China, it is suggested that the lamprophyres fromed in the same magmatic-thermal event with large amounts of Yanshanian granites in South China. It is suggested that the lithosphere was still in extension in the Middle-Late Jurassic in South China.Hf isotope analysis of zircons from the lamprophyre shows that ε_(Hf)(t) values range from-29.55 to 12.81 while T_(DM2) values from 3.95 to 1.00 Ga, which indicates that it is probably having a hidden crust of Paleoarchean-Paleoproterozoic in the study area.
In the western Nanlingmetallogenic belt of South China, the Mesozoic magmatism is widely distributed in Pingle. This study reports the LA-ICP-MS zircon U-Pb age for the lamprophyres from Shazi in Pingle, Northeastern Guangxi and suggests that the formation age of the lamprophyres is younger than 163 Ma. Combined with the previous studies on the Yanshanian diagenesis and mineralization in South China, it is suggested that the lamprophyres fromed in the same magmatic-thermal event with large amounts of Yanshanian granites in South China. It is suggested that the lithosphere was still in extension in the Middle-Late Jurassic in South China.Hf isotope analysis of zircons from the lamprophyre shows that ε_(Hf)(t) values range from-29.55 to 12.81 while T_(DM2) values from 3.95 to 1.00 Ga, which indicates that it is probably having a hidden crust of Paleoarchean-Paleoproterozoic in the study area.
引文
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