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地球学报  2010 

四川东部华蓥山海相二叠/三叠系界线附近的锶同位素组成

DOI: 10.3975/cagsb.2010.06.09

Keywords: 二叠系,三叠系,锶同位素地层学,华蓥山,四川东部

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Abstract:

二叠/三叠系界线附近的地球化学记录在地球环境重大变革研究中有着重要的意义。根据锶同位素地层学的基本原理,本文对四川东部华蓥山海相二叠/三叠系界线附近碳酸盐岩样品进行显微组构观察、化学成分分析及其对同期海水代表性评估的基础上,测试了这些样品的锶同位素组成。结果表明,这些样品的原始沉积组构保存较好、Sr含量较高,可以认为其只遭受过较低程度的成岩蚀变改造,并保留了较多的海水原始信息,锶同位素比值分布范围在0.707158~0.707334之间,与前人公布的同期海水值吻合较好,体现了全球地质事件对海水锶同位素组成控制的一致性。四川东部华蓥山二叠/三叠系界线附近较为系统的锶同位素演化研究,可望为我国南方海相二叠/三叠系界线附近化学地层学及其对比研究提供一些有价值的基础资料。

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