Linking biocalcification to the global carbon cycle: carbonate systems during the Paleogene

将生物钙化与全球碳循环联系起来：古近纪时期的碳酸盐系统

• 批准号: 5379757
• 负责人: Professorin Dr. Maria Mutti
• 金额: --
• 依托单位: Geologisches Institut
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2002
• 资助国家: 德国
• 起止时间: 2001-12-31 至 2005-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5379757?language=en
• 关键词: Linking; biocalcification; global; carbon; cycle

A fundamental step to understand the link between the carbon cycle and changes in biocalcification rates requires constraining the controls on the expansion/restrictions of biocalcifiers in carbonate environments at times of major d13C excursion. We propose to tackle this problem investigating Paleogene carbonate systems in Spain, where the qualities of outcrops and the number of previous studies in the area provide excellent preconditions for the project. The Paleogene is an ideal time because it contains large magnitude events affecting both biocalcification and the carbon cycle. During the Paleogene, carbonate environments witnessed the rapid diversification, maximum diversity and later extinction of larger benthic foraminifera. In the early Paleogene, marine carbonate record a major excursion in d13C, a 3o/oo shift (the largest in the Cenozoic), indicating major changes in the global carbon cycle. This also provides the basis for a high-resolution chemostratigraphy troughout the Paleocene. We intend to construct integrated shelf to basins transects where we will integrate data on the distribution in time and space of carbonate facies (to constrain sea level changes and variability in biocalcification) with isotopic and geochemical data (to constrain ages via chemostratigraphy, and paleonvironmental changes). This will allow to identify biocalcification patterns and ultimately relate variations in carbon partitioning to climatic changes.

了解碳循环与生物钙化速率变化之间联系的一个基本步骤是，在 d13C 偏移较大时，限制对碳酸盐环境中生物钙化剂的扩展/限制的控制。我们建议通过调查西班牙的古近纪碳酸盐系统来解决这个问题，该地区露头的质量和该地区先前的研究数量为该项目提供了极好的先决条件。古近纪是一个理想的时期，因为它包含影响生物钙化和碳循环的大规模事件。在古近纪期间，碳酸盐环境见证了大型底栖有孔虫的快速多样化、多样性最大化和后来的灭绝。在古近纪早期，海洋碳酸盐记录了 d13C 的重大偏移，即 3o/oo 的偏移（新生代最大），表明全球碳循环发生了重大变化。这也为古新世高分辨率化学地层学提供了基础。我们打算构建综合的陆架到盆地横断面，其中我们将碳酸盐相的时间和空间分布数据（以限制海平面变化和生物钙化的变异性）与同位素和地球化学数据（以通过化学地层学和古环境变化限制年龄）相结合。这将有助于识别生物钙化模式，并最终将碳分配的变化与气候变化联系起来。