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扬子西缘中元古代沉积地层锆石U-Pb年龄及Hf同位素组成

, PP. 1287-1298

Keywords: 扬子西缘,中元古界,锆石U-Pb年龄,Hf同位素,构造意义

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Abstract:

?扬子西缘中元古代沉积地层为一套相对稳定的环境下沉积的碎屑岩-碳酸盐岩组合,夹有少量的凝灰岩和玄武岩.在不同地区,中元古代沉积地层分别被命名为昆阳群、会理群和东川群.通过对昆阳群、会理群和东川群中凝灰岩锆石U-Pb定年,结合对昆阳群和东川群碎屑岩中锆石U-Pb定年结果,表明昆阳群和会理群的沉积时代为1050~1000Ma之间,它们属于同时异相的沉积组合.依据碎屑锆石年龄以及Hf同位素特征,表明昆阳群和会理群的碎屑物质主要来自华夏地块.另外,获得东川群中的凝灰岩锆石U-Pb年龄为1500Ma,且东川群中的碎屑锆石年龄均大于1.5Ga,表明东川群的沉积时代为中元古代长城纪晚期,其碎屑物质主要来自扬子地块古老基底.通过对上述三套地层单元中不同类型锆石系统地Hf同位素测定,发现在1.5和1.0Ga左右,锆石的Hf初始值出现快速上升.已有研究表明,昆阳群和会理群是扬子和华夏地块在格林威尔期发生拼合后在扬子一侧形成的前陆盆地沉积建造.扬子和华夏从西向东是逐渐汇聚,并在0.9Ga于扬子东段最终完成汇聚,代表了Rodinia超大陆汇聚的最后阶段.锆石的Hf同位素表明,超大陆旋回和地壳增生具有密切联系.

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