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.

危地马拉湖Itzá湖深钻探计划中对沉积物的拟议研究结合了火山学，古气候，古生物学领域，以建立中美洲气候代理的最长古录制，以及在200 ka以上的Tephra记录的延续。基于主要元素指纹的PeténItzá灰的初步tephrarchology将通过痕量叶片相关性加强。此外，与中美洲火山阵线喷发的相关性将极大地促进这些喷发的大小，因为尤其是喷发沉积物的远端部分保留了更好约束喷发量的关键。 Lacustrine Tephras的直接年龄预期，以及整个地区主要的钥匙床Los Chocoyos Tephra，将进一步协助并校准所得的年龄模型。该提案的另一个方面是将海洋和湖泊tephrospraphigraphy以及大陆和海洋钻探计划联系起来，在该计划中，来自中美洲的Tephras的相关性超出了已知的明显构成的Tephra，来自火山弧。