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贵州乐康P/T界线无机碳同位素特征及其意义

, PP. 248-255

Keywords: 乐康剖面,碳同位素,P/T界线,深水

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Abstract:

贵州乐康深水海槽相中的无机碳同位素研究表明,晚二叠世由于局限环境,区域内生物贫乏,相对应的碳同位素值比同期其他剖面中碳同位素值偏低。而在长兴阶晚期,由于受区域内火山作用的影响,在剖面界线之下发育另一个碳同位素负异常,之后碳同位素有所回升,直至界线附近降低为最低值。早三叠世由于绝灭之后的生物复苏缓慢,无机碳同位素表现为低正值。碳同位素特征显示,碳同位素的变化受到了生物和环境等多种因素的综合控制。

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