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地质通报  2010 

辽东半岛细河群沉积岩碎屑锆石SHRIMPU-Pb年龄及其地质意义

, PP. 1113-1122

Keywords: 青白口系,骆驼岭组,细河群,钓鱼台组,碎屑锆石SHRIMPU-Pb年龄,辽东半岛

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Abstract:

对辽东半岛青白口系骆驼岭组和钓鱼台组沉积岩碎屑锆石进行了测试,根据沉积岩碎屑锆石年龄分布模式探讨了两地的沉积物源和沉积时代的上限。辽东半岛青白口系细河群钓鱼台组碎屑锆石分布模式中年龄主峰值为1.6Ga,最小年龄为1075Ma,说明钓鱼台组的沉积时代要晚于1000Ma,沉积岩碎屑锆石的年龄分布模式说明该组与华北古陆为不同物源,其时代有可能不一致。同时,根据2009年11月24日全国地层委员会前寒武纪分会扩大会议上形成的一个共识和最新的锆石SHRIMPU-Pb年龄对中国晚前寒武纪地层年表进行重新标定:即长城系(Ch,Pt21)限定为1.8~1.6Ga,蓟县系(Jx,Pt22)限定为1.6~1.4Ga,待建系(Pt23-4)限定为1.4~1.0Ga,青白口系(Qb,Pt31)限定为1000~780Ma,南华系(Nh,Pt32)限定为780~635Ma和震旦系(Z,Pt33)限定为635~542Ma。

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