葛禹,时志强

• 1:成都理工大学沉积地质研究院
• 2:成都理工大学油气藏地质及开发工程国家重点实验室

摘要(Abstract)：

早侏罗世经历了赫塘期、辛涅缪尔期、普林斯巴期和土阿辛期，其中土阿辛期大洋缺氧事件(T-OAE)被广泛研究。但在辛涅缪尔阶-普林斯巴阶界线处，δ~(13)C_(org)及δ~(13)C_(carb)曲线均发生负偏，局部伴随黑色页岩沉积。其在英国、法国、意大利、葡萄牙以及中国等地区都有记录，碳同位素的变化伴随着环境、气候的变化，研究显示该事件可能是全球性的，被称为“S-P界线事件”(SPBE)。此次地质事件与T-OAE事件类似，也显示了一次大洋缺氧事件，其发生时有轻碳同位素被排入了大气系统中，但是轻碳同位素的来源尚不明确，部分学者认为是大火成岩省喷发时排放的轻碳物质注入了海洋-大气系统所致。目前对该事件的研究主要集中于欧洲海相地层，其对陆地生态系统的影响还知之甚少。我国四川盆地下侏罗统湖相沉积发育良好，下侏罗统自流井组东岳庙段沉积有与大安寨段(T-OAE发生层段)类似的黑色页岩及介壳灰岩，其有机碳同位素负偏，显示了S-P界线事件的影响，其与T-OAE类似也对四川盆地早侏罗世古湖泊产生了影响。

关键词(KeyWords)： 早侏罗世;S-P界线事件;大洋缺氧事件;碳同位素偏移

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金面上项目(41572085)

作者(Author): 葛禹,时志强

DOI: 10.19509/j.cnki.dzkq.2022.0071

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