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地质学报  2006 

四川盆地东部海相下―中三叠统界线的锶同位素年龄标定

, PP. 1691-1698

Keywords: 下―中三叠统界线年龄值,海相蒸发岩,锶同位素地层学,海相地层定年,四川盆地东部

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Abstract:

中国西南地区海相下―中三叠统以火山碎屑岩为其直观界线,该年龄的标定可为区域地层年表和国际地层委员会全球标准年表研究提供重要的下―中三叠统界线年龄参考值.基于此,本文测试了四川盆地东部华蓥山下―中三叠统界线火山碎屑岩附近的石膏和硬石膏样品87Sr/86Sr比值,以及相应的Si、Ca、Mg、Mn、Sr以及SO42-的含量,根据锶同位素地层学的原理,尝试对下―中三叠统界线进行了年龄标定;同时评估了样品的成岩蚀变性、对海水信息的代表性以及年龄标定结果的可靠性.火山碎屑岩附近5个样品的87Sr/86Sr比值变化在0.708243~0.708391之间,标定的年龄值在240.5~242.5Ma的范围内,2个紧靠火山碎屑岩样品的年龄值在242Ma左右(分别为241.9Ma和242.5Ma),从而为华南地区以火山碎屑岩作为海相下―中三叠统界线的合理性提供了重要的化学地层学依据,也为全球下―中三叠统界线提供了一个新的年龄值.

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