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Sea-water temperatures of the early Cretaceous derived from stable isotopes of belemnites and TEX86 of organic-rich sediments

来自箭石稳定同位素和富含有机物沉积物 TEX86 的白垩纪早期海水温度

基本信息

批准号：
20783769
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 Grants
财政年份：
2006
资助国家：
德国
起止时间：
2005-12-31 至 2010-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/20783769?language=en
关键词：
Sea water temperatures early Cretaceous

项目摘要

The climatic evolution of the early Cretaceous (Berriasian - Barremian) is currently interpreted in two different ways. The view of a generally warm-equable greenhouse world is contradicted by a rather differentiated picture with cold snaps possibly even causing polar ice caps. Evidence for either one of these views is supplied by a) palaeontological observations, b) stable isotope data, c) sedimentological findings and d) TEX86 data. Stable isotope data of (18O and (13C of both bulk rock and of belemnites have been used for reconstructing climatic variations for the early Cretaceous. Current investigations of stable isotopes of belemnites lack, however, either a high resolution record, a good preservation and taxonomic backgrounds or a well refined stratigraphy so that the records published so far are often characterised by gaps and hiati. This project aims at establishing a stable isotope reference record for the Valanginian - Barremian period in expanded sections of the Boreal Realm. This will be achieved by analysing well preserved and stratigraphically well constrained belemnite guards from NW Germany on a high resolution scale. Comprehensive bed-by-bed collections of belemnites, which have been made accessible only recently, will be investigated in order to understand the climatic variations in the southern part of the Boreal Realm. These results will be compared to organic-geochemical data (TEX86) and published data. This will enable us to decipher the climatic evolution of this period.

早白垩世（Berriasian - Barremian）的气候演化目前有两种不同的解释。一个总体上温暖平衡的温室世界的观点与一个相当不同的观点相矛盾，寒流甚至可能导致极地冰盖。这两种观点中的任何一种观点的证据来自a）古生物学观察，B）稳定同位素数据，c）沉积学发现和d）TEX 86数据。利用岩石和碧流岩的~（18）O和~（13）C稳定同位素数据重建了早白垩世的气候变化。然而，目前的调查稳定同位素的碧流石缺乏，要么是一个高分辨率的记录，一个良好的保存和分类学背景或一个很好的细化地层，使迄今为止公布的记录往往是由差距和hiati的特点。该项目旨在建立一个稳定的同位素参考记录的Valanginian-Barremian期间在扩大部分的北方领域。这将通过分析保存完好和地层良好的约束从西北德国的高分辨率规模的箭石警卫。为了了解北部地区南部的气候变化，将对最近才获得的全面的逐层收集的箭石进行调查。这些结果将与有机地球化学数据（TEX 86）和已发表的数据进行比较。这将使我们能够破译这一时期的气候演变。