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The Valanginian "cold snap" and its impact on terrestrial environments - insights from plant biomarkers, stable isotopes and spore-pollen assemblages

瓦朗吉尼亚“寒潮”及其对陆地环境的影响——植物生物标志物、稳定同位素和孢子花粉组合的见解

基本信息

批准号：
103114406
负责人：
Professor Dr. Ulrich Heimhofer
金额：
--
依托单位：
Palynology
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2008
资助国家：
德国
起止时间：
2007-12-31 至 2013-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/103114406?language=en
关键词：
Valanginian cold snap its impact

项目摘要

A critical assessment of terrestrial proxy records is essential to better understand the impact of early Cretaceous climatic variability on continental environments and ecosystems. The proposed project uses land plant biomarkers and spore-pollen records from two different study sites covering the Valanginian carbon isotope excursion (CIE) that allow (1) to address the development of vegetation patterns in response to climatic cooling and associated humidity changes and (2) to access the effects of changes in low- and mid-latitude moisture distribution on plant 13C discrimination. A continuous 150 m section from the Vocontian Basin, SE France will allow to study mid-latitude terrestrial climate evolution and the associated vegetation response at a high time resolution and will be compared in detail with a similar data-set from a low-latitude site (Agadir-Essaouira Basin, Morocco). The establishment of an integrated stratigraphic framework including high-resolution chemostratigraphy will facilitate the integration of the terrestrial records with existing marinederived proxy data on temperature evolution. Based on the δ13C signature of plant-derived biomarkers, a quantitative model of the humidity changes associated with the Valanginian CIE will be established. The achievement of these goals is expected from a combined approach including organic geochemical and palynological investigations as well as biogeochemical modelling.

陆地代用记录的关键评估是必不可少的，以更好地了解白垩纪早期气候变化对大陆环境和生态系统的影响。拟议的项目使用陆地植物生物标志物和孢子花粉记录，从两个不同的研究地点，包括Valanginian碳同位素漂移（CIE），允许（1）解决植被模式的发展，以应对气候变冷和相关的湿度变化和（2）访问的影响，在低纬度和中纬度水分分布对植物13 C歧视。法国东南部Vocontian盆地的一个连续的150米的剖面将允许以高时间分辨率研究中纬度陆地气候演变和相关的植被反应，并将与低纬度站点（摩洛哥的Agadir-Essaouira盆地）的类似数据集进行详细比较。建立一个包括高分辨率化学地层学在内的综合地层框架，将有助于将陆地记录与现有的海洋温度演变代用数据相结合。基于植物源生物标志物的δ 13 C特征，将建立与Valanginian CIE相关的湿度变化的定量模型。通过有机地球化学和孢粉学调查以及生物地球化学建模等综合方法，有望实现这些目标。