Tephrochronology of lacustrine ash layers in Lake Petén Itzá sediments: Implications for regional volcanology and Central American palaeoclimate

佩滕伊察湖沉积物中湖相灰层的年代学：对区域火山学和中美洲古气候的影响

• 批准号: 252760755
• 负责人: Privatdozent Dr. Steffen Kutterolf
• 金额: --
• 依托单位: Institut für Geosysteme und Bioindikation
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2014
• 资助国家: 德国
• 起止时间: 2013-12-31 至 2016-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/252760755?language=en
• 关键词: Tephrochronology; lacustrine; ash; layers; Lake

The proposed research on sediments from the deep drilling program at lake Petén Itzá, Guatemala, combines the fields of volcanology, paleoclimate, paleoecology, in order to establish the longest paleo-record for climate proxies in Central America as well as a continuation of the tephra record beyond 200 ka. Preliminary tephrachronology of the Petén Itzá ashes based on major element fingerprinting will be strengthend by trace lement correlations. Additionally the correlations to eruptions of the Central American volcanic front will contribute greatly to the determination of the magnitude of those eruptions since especially the distal part of the eruption deposits preserves the key to better constraint eruptive volumes. Direct age dating of lacustrine tephras but also the Los Chocoyos tephra, a major key bed in the entire region, will further assist and calibrate the resulting age model. Another aspect of the proposal is to link marine and lacustrine tephrostratigraphy, and therefore also the large continental and marine drilling programs, where the correlation to field tephras from Central America is beyond the known well-constrained tephra succession from the volcanic arc.

拟议的对危地马拉佩滕伊察湖深钻计划沉积物的研究结合了火山学、古气候、古生态学领域，以建立中美洲最长的气候代理古记录以及200ka以上的火山灰记录的延续。基于主量元素指纹图谱的佩滕伊察骨灰初步年代学研究将通过微量元素相关性得到加强。此外，与中美洲火山前缘喷发的相关性将极大地有助于确定这些喷发的强度，因为尤其是喷发沉积物的远端部分保留了更好地限制喷发量的关键。对湖相火山灰以及整个地区的主要关键岩床 Los Chocoyos 火山灰进行直接年龄测定，将进一步协助和校准由此产生的年龄模型。该提案的另一个方面是将海洋和湖泊火山地层学联系起来，从而也将大型大陆和海洋钻探计划联系起来，其中与来自中美洲的野外火山灰的相关性超出了已知的来自火山弧的严格约束的火山灰序列。