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科学通报  2014 

长江中下游溧水盆地中基性次火山岩-侵入岩的锆石U-Pb定年和Lu-Hf同位素

DOI: 10.1360/csb2014-59-14-1305, PP. 1305-1317

Keywords: 长江中下游,溧水盆地,锆石U-Pb年龄,锆石Hf同位素,板块后撤

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Abstract:

对溧水盆地8件典型的中生代次火山岩-侵入岩进行了详细的锆石U-Pb年代学和Lu-Hf同位素研究.结果显示,老虎头角闪闪长玢岩年龄为130.5±1.6Ma,大铜山角闪闪长玢岩年龄为136.0±3.4Ma,大魏庄角闪闪长玢岩年龄为132.7±2.7Ma,野山凹粗安斑岩年龄为127.0±1.9Ma,砚瓦桥石英闪长玢岩年龄为129.4±1.7Ma,西北山辉石闪长玢岩年龄为133.2±2.1Ma,长山头黑云母安山玢岩年龄为131.1±2.3Ma,尖山黑云母粗安斑岩年龄为127.4±1.8Ma.所有岩浆岩均为早白垩世产物,指示了溧水盆地岩浆活动的峰期时代.岩浆岩的锆石eHf(t)值变化于-3.54~-9.11,其中大多数变化于-3.54~-5.93,与长江中下游其他火山岩盆地中同时代火山岩和侵入岩的锆石Hf同位素组成相似,表明它们具有相似的源区组成.在分析长江中下游地区以及邻区同时代岩浆特征的基础上,提出俯冲太平洋板块后撤模式来解释中国东部晚中生代岩浆活动.侏罗纪中晚期-白垩纪早期(170~135Ma),太平洋板块向欧亚大陆俯冲,总体处于挤压背景,岩浆活动呈现出由沿海向内陆年轻化的趋势,且多具壳源特征;白垩纪早期(~135Ma)之后,太平洋板块的俯冲作用减弱,俯冲板片发生后撤,研究区总体转变为拉张背景,从而形成了一系列火山盆地,造成大量富集地幔和较少量古老地壳物质的熔融,形成大量中基性岩浆岩.

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