The carbonate skeleton of recent and fossil Coleoidea: Biological, physical or diagenetic control?

最近的和化石的鞘总纲的碳酸盐骨架：生物、物理或成岩控制？

• 批准号: 218386897
• 负责人: Professor Dr. Jörg Mutterlose
• 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 Units
• 财政年份: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/218386897?language=en
• 关键词: carbonate; skeleton; recent; fossil; Coleoidea

This project focuses on the structure and function of internal carbonate skeletons of recent and fossil Coleoidea (Sepia, belemnites) and their geochemical signals. It aims at understanding to which extent the geochemical composition of these skeletons, widely used by stratigraphers, geochemists and palaeoclimatologists is controlled by palaeobiological (1), physical (2) and/or diagenetic factors (3). We thereby clearly cover the interface of biology, autecology and diagenesis. 1. Cuttlebones of recent Sepia spp. suggest significantly different growth rates for tropical and high latitudinal taxa, a factor that may apply for belemnites as well. Different morphological groups of belemnites may have had a different ontogeny, occupying different habitats. This should be mirrored in the geochemical signals reflecting the composition of the ocean water. 2. Temperature and salinity seem to be the main physical factors controlling the composition of the belemnite guards. We want to clearly differentiate between both factors by using a geochemical multi proxy approach (δ18O, δ13C, Mg/Ca). 3. Potential diagenetic overprint, crucial for the interpretation of the signals, will be tested. By applying various techniques (SEM, cathodoluminiscence analyses, EBSD, microprobe, elemental analyses) to thin sections of various morphotypes, differential degrees of diagenetic alteration should be defined.

本项目主要研究珊瑚类（乌贼、箭石）化石和现代化石内部碳酸盐骨架的结构、功能及其地球化学信号。它的目的是了解这些骨架的地球化学组成，广泛使用的地层学家，地球化学家和古气候学家在何种程度上是由古生物（1），物理（2）和/或成岩因素（3）控制。因此，我们清楚地涵盖了生物学，autocology和成岩作用的界面。1.乌贼乌贼骨。这表明热带和高纬度类群的生长速度明显不同，这一因素也可能适用于箭石。不同形态的箭石类群可能具有不同的个体发育，占据不同的生境。这应该反映在反映海水成分的地球化学信号中。2.温度和盐度似乎是控制箭石卫士组成的主要物理因子。我们希望通过使用地球化学多代用指标方法（δ 18 O，δ 13 C，Mg/Ca）来明确区分这两个因素。3.将测试潜在的成岩叠加，这对于信号的解释至关重要。通过应用各种技术（扫描电镜、阴极发光分析、电子背散射衍射、微探针、元素分析）对各种形态类型的薄片进行分析，应确定成岩蚀变的不同程度。