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High-resolution biometry and morphometric characterization of calcareous nannofossils during the Oceanic Anoxic Events 1a and 1d in a global context

全球背景下海洋缺氧事件 1a 和 1d 期间钙质超微化石的高分辨率生物测量和形态特征

基本信息

批准号：
241525448
负责人：
Professor Dr. Jörg Mutterlose
金额：
--
依托单位：
Bundesanstalt für Geowissenschaften und Rohstoffe (BGR)
依托单位国家：
德国
项目类别：
Infrastructure Priority Programmes
财政年份：
2013
资助国家：
德国
起止时间：
2012-12-31 至 2017-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/241525448?language=en
关键词：
resolution biometry morphometric characterization calcareous

项目摘要

Based on their global distribution and their sensitivity to ecologicalchanges, calcareous nannofossils are ideal proxies for reconstructing past climatic conditions. Up to now, calcareous nannofossil assemblageshave been studied particularly to understand ecological parameters. Biometric studies of individual species in recent years have shown, that size variations of coccoliths can be associated with ecological changes. The understanding of the driving forces of size variation is, however, poor. We therefore plan to do a highresolution study on the size variation of the most-common coccolith species of the mid-Cretaceous with respect to the global and radical impact of the Oceanic Anoxic Events 1a and 1d (OAE 1a, 1d). In both cases, material from different latitudes and well defined settings will be used. The lower Aptian OAE 1a of the Boreal Realm will be represented by four localities (North Sea: North Jens-1 and Adda-2; Lower Saxony Basin: Alstätte 1 and Hoheneggelsen KB09). A comparison of the data obtained with the existing results from the Tethys will lead to a better and broader understanding of the climatic changes and the reasons for the coccoliths size variation. Material of the OAE 1d will be investigated from three localities spanning major parts of the globe: Germany (Kirchrode I / Anderten I), the Atlantic (ODP Site 1052E) and the Indian Ocean (ODP Site 763B). The study aims at a) understanding the reasons for size variations of coccoliths from different sites and settings, b) testing whether these size variations are globally synchronous and c) establishing size variation as an ecological proxy for OAEs.

基于它们的全球分布和对生态变化的敏感性，钙质超微化石是重建过去气候条件的理想替代品。到目前为止，人们对钙质超微化石组合进行了专门的研究，以了解生态参数。近年来对个别物种的生物测定研究表明，球藻的大小变化可能与生态变化有关。然而，对尺寸变化的驱动力的理解很差。因此，我们计划对白垩纪中期最常见的球石物种的大小变化与海洋缺氧事件1a和1d(OAE 1a，1d)的全球性和根本性影响进行高分辨率研究。在这两种情况下，都将使用来自不同纬度和定义明确的设置的材料。北方界的下阿普提亚OAE 1a将由四个地点代表(北海：北延斯-1和阿达-2；下萨克森盆地：阿尔斯特1和霍亨格尔森KB09)。将获得的数据与特提斯的现有结果进行比较，将有助于更好和更广泛地了解气候变化和球虫大小变化的原因。OAE 1D的材料将在全球主要地区的三个地点进行调查：德国(Kirchrode I/Anderten I)、大西洋(ODP1052E站)和印度洋(ODP763B站)。这项研究的目的是a)了解不同地点和环境中的球虫大小差异的原因，b)测试这些大小差异是否全球同步，以及c)建立大小差异作为OAEs的生态代理。