CO2, organic carbon burial, and global climate change in the Wenlock (Silurian):waired 13 Ccarb and 13 Corg analyses of marine carbonates

Wenlock（志留纪）的二氧化碳、有机碳埋藏和全球气候变化：对海洋碳酸盐的 13 Ccarb 和 13 Corg 分析

• 批准号: 5455239
• 负责人: Professor Dr. Axel Munnecke
• 金额: --
• 依托单位: Forschungsschwerpunkt Paläontologie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2005
• 资助国家: 德国
• 起止时间: 2004-12-31 至 2009-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5455239?language=en
• 关键词: CO2; organic; carbon; burial; global

The propose of this investigation is to examine the most volatile Series in the Phanerozoic history of the global carbon cycle and the role of CO2 in globale climate change. The Wenlock Series contains two major (+4%) positive carbon isotope excursions (early Wenlock Ireviken Excursion; late Wenlock Mulde Excursion) and both have been associated in the literature with glaciation and global climate change. The role of the carbon cycle and CO2 in global climate change has long been a topic of considerable debate. However, changes in CO2 are most often considered to be the primary driver of Phanerozoic climate change. Recent publications framing this debate have forcused on long-term climate change by comparing various Phanerozoic scale proxy records. Inversitgations to produce high-resolution (sub System scale) records of CO2 change in the Palaeozoic are only just beginning. In the lower Palaeozoic, the most widely accepted method for determining palaeo-¿ CO2 is paired analysis of carbon isotopes in both carbonate and organic carbon. Recent data from North America indicate that a previously unknown negative excursion in ¿ 13Corg coincided with the positive excursion in ¿ 13Corg during the early Wenlock. The data indicate the ¿ CO2 was increasing during the Ireviken positive carbon isotope excursion. This relationship has great implications for Silurian climate/ocean models, but at present is known from only one section globally. Paired isotopic analyses of ¿ 13Ccarb and ¿ 13Corg on the late Wenlock excusion have been carried out so far only on 14 samples on one bore hole. The investigation proposed herein will provide the most comprehensive (both temporally and spatially) record of ¿ CO2 and organic carbon burial of any Series in the lower Palaeozoic. This will be accomplished in two steps: 1) high-resolution (100,000 years per sample) carbonate carbon (¿ 13Ccarb) isotope stratigraphy 2) paired carbonate and organic carbon (¿ 13Ccarb and ¿ Corg) isotope stratigraphy of the Wenlock Series from sections globally. As the Wenlockian isotope excursions have many conspicuous similarities (geochemial, sedimentological, and palaeontological) with other Early Palaeozoic isotope excursions we expect new insights into the climate systems not only for the Wenlock but for the whole Early Palaeozoic.

这项调查的目的是研究显生宙历史上最不稳定的全球碳循环系列以及二氧化碳在全球气候变化中的作用。温洛克系列包含两个主要的（+4%）正碳同位素偏移（早期温洛克伊瑞维肯）。碳循环和二氧化碳在全球气候变化中的作用早已在文献中被提及。然而，二氧化碳的变化通常被认为是显生宙气候变化的主要驱动因素，最近的出版物通过比较各种显生宙尺度的替代记录来关注长期气候变化。古生代二氧化碳变化的分辨率（子系统尺度）记录才刚刚开始，在下古生代，最广泛接受的确定古生代的方法才刚刚开始。 CO2 对碳酸盐和有机碳中的碳同位素进行配对分析，来自北美的最新数据表明 ¿ 中存在先前未知的负偏移。 13Corg 与 ¿ 的正偏移同时发生13Corg 早期温洛克时期的数据表明 ¿在艾瑞维肯正碳同位素偏移期间，二氧化碳含量不断增加，这种关系对志留纪气候/海洋模型具有重要意义，但目前仅从全球的一对同位素分析中得知。 13Ccarb 和 ¿迄今为止，13Corg 仅对一个钻孔的 14 个样本进行了晚期文洛克排除，本文提出的调查将提供最全面的（时间和空间上）记录。下古生代任何系列的二氧化碳和有机碳埋藏这将通过两个步骤完成：1）高分辨率（每个样本 100,000 年）碳酸盐碳（¿ 13Ccarb）同位素地层学 2）配对碳酸盐和有机碳（¿ 13Ccarb）。和 ¿Corg）来自全球剖面的 Wenlock 系列同位素地层学。这些偏移与其他早古生代同位素偏移有许多明显的相似之处（地球化学、沉积学和古生物学），我们期望不仅对温洛克而且对整个早古生代的气候系统有新的见​​解。