在黑色页岩中对有机碳的矿物表面控制
Martin J Kennedy1, David R Pevear, Ronald J Hill
1Department of Earth Science, University of California, Riverside, CA 92521, USA. martink@mail.ucr
Science (New York, N.Y.)
|January 26, 2002
概括
矿物表面积解释了白时期黑色页岩中85%的有机碳总变化. 这突显了粘土矿物质吸附在保存有机碳中的关键作用,这表明大陆气候影响埋葬更多的海洋因素.
科学领域:
- 地质化学 地质化学
- 沉积物学的沉积物学
- 古海洋学是古海洋学.
背景情况:
- 在海洋沉积物中保存有机碳对于了解全球碳循环至关重要.
- 黑页岩是古代有机碳的重要存储库,提供了对过去环境的洞察力.
- 在古代海洋环境中控制有机碳埋葬的因素仍然是一个关键的研究领域.
研究的目的:
- 为了研究矿物表面积和晚白纪黑页岩沉积物中总有机碳含量之间的关系.
- 确定矿物表面,特别是粘土矿物质在有机物质吸附和保存中的作用.
- 探索这些发现对理解石油倾向的页岩层中的有机碳捕集机制的影响.
主要方法:
- 来自西部内陆海路两个地点的黑页岩样本的分析.
- 总有机碳含量的量定量.
- 矿物表面积的测量,重点是粘土矿物贡献.
- 显微镜和光谱分析以确定有机物和矿物质的关联.
主要成果:
- 发现了强烈的相关性,矿物表面积解释了总有机碳变化的85%.
- 有证据表明,碳化合物的吸附到粘土矿物表面是有机碳保存的主要机制.
- 在石灰岩中间层中观察到有机物质,表明与粘土矿物质密切相关.
结论:
- 由粘土矿物学驱动的矿物表面积,是这种黑色页岩中有机碳含量的主导控制因素.
- 对矿物表面的吸附在有机碳埋葬和保存中起着基本作用,类似于现代海洋沉积物.
- 大陆的气候变化模式和由此产生的粘土矿物学可能比海洋水化学或生产力更为关键,以捕捉易油页岩中的有机碳.
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