Geochemical Reconstruction of Lateral Changes in Cenomanian Epicontinental Shelf Water Masses, Northern Germany

德国北部塞诺曼阶陆缘陆架水体横向变化的地球化学重建

• 批准号: 56194565
• 负责人: Professor Dr. Adrian Immenhauser
• 金额: --
• 依托单位: Institut für Geologie, Mineralogie und Geophysik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2007
• 资助国家: 德国
• 起止时间: 2006-12-31 至 2010-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/56194565?language=en
• 关键词: Geochemical; Reconstruction; Lateral; Changes; Cenomanian

The interaction of sedimentary, physical, chemical and biological processes that are manifested in the rock record of ancient epeiric seas is highly complex. Shallow (neritic) epeiric seawater masses and their carbon cycle are often decoupled from those of deep epicontinental basins and the open ocean. This has implications for the interpretation of global secular trends based on epeiric proxy data. Here we propose a pilot study attempting to analyze and resolve proximal-distal seawater gradients of the epicontinental Cenomanian sea of northern Germany. The tools applied to the strata of the target interval (late Early Cenomanian Mantelliceras dixoni Zone) combine an integrated stratigraphic calibration (bio-, sequence, event and cyclo-stratigraphy) with geochemical (C, O, Sr, trace elements) investigations of low-Mg skeletal calcite and matrix micrite material sampled laterally along well-dated event horizons over proximal-distal transects of up to 150 km. Using this highresolution approach we intend to cross and decipher vertical and horizontal boundaries of seawater masses as documented in the fossil and sedimentary record of Cenomanian strata of northern Germany in order to further enhance our understanding of the structure and water mass dynamics of Boreal epeiric seas.

古代海表岩石记录中所体现的沉积、物理、化学和生物过程的相互作用是高度复杂的。浅海（浅海）浅海海水团及其碳循环通常与深海盆地和公海的碳循环脱钩。这对于基于经验代理数据的全球长期趋势的解释具有影响。在这里，我们提出了一项试点研究，试图分析和解决德国北部陆缘塞诺曼海的近端-远端海水梯度。应用于目标层段（早塞诺曼世晚期 Mantelliceras dixoni 地带）地层的工具将综合地层校准（生物地层、层序地层、事件地层和旋回地层）与对低镁骨架方解石和基体微晶石材料的地球化学（C、O、Sr、微量元素）研究相结合，这些研究是沿着确定的事件视界横向采样的。 近远端横断面长达150公里。利用这种高分辨率方法，我们打算跨越并破译德国北部塞诺曼期地层的化石和沉积记录中记录的海水团的垂直和水平边界，以进一步增强我们对北方表海的结构和水团动态的理解。