Tephrochronostratigraphy in marine and terrestrial sediments of New Zealand: Benchmark for Miocene to Quaternary explosive volcanism

新西兰海洋和陆地沉积物的岩石年代地层学：中新世至第四纪爆发性火山活动的基准

• 批准号: 428064658
• 负责人: Privatdozent Dr. Steffen Kutterolf
• 金额: --
• 依托单位: School of Geography, Environment and Earth Sciences
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/428064658?language=en
• 关键词: Tephrochronostratigraphy; marine; terrestrial; sediments; New

During IODP Expeditions 372 and 375 sediments have been drilled and sampled down to the Cretaceous including intercalated tephra layers from the Miocene to Holocene. The drill sites are located in the Pacific, ~250 km downwind of the Taupo volcanic Zone (TVZ), one of largest and most frequently active silicic centers on earth, and also close to the Coromandel volcanic zone (CVZ) a sparsely investigated Neogene volcanic arc. The tephra inventories of these intermediate distant sites provide the missing link between the proximal (<~100 km) terrestrial and very distal (~1000 km) ODP sites to establish a nearly complete eruptive history from the early Miocene to recent for New Zealand´s explosive volcanism. Within three major goals, proposed in an earlier proposal, compositional, temporal, and genetic differences of its eruption products and associated sediments will be investigate.Since the pandemic situation prevented us from field work in New Zealand to assist the marine work and also compromised our lab work and analytical lab visits, we are delayed and propose here an extension of 6 month, basically to secure the PhD´s work and thesis. During the first 24 months of this proposal this project focused on the volcanic products from highly explosive eruptions from New Zealand during the Neogene and Quaternary in all deep drilling sites off New Zealand. We used geochemical, petrological and volcanological approaches for tephra and sediment characterization to quantitatively and qualitatively decrypt their provenance and the eruption succession and fulfilled therefore goal 1 of the initial proposal. We successfully reconstructed the cyclic history of highly explosive volcanic activity of both arc systems (CVZ and TVZ) over a time span of about at least 13 Myrs (parts of goal 2) and will further address in the extension questions regarding compositional and genetic differences and similarities, as well as recurrence rates and periodicities in both systems, covering for the first time also a Neogene eruption time series. Bulk rock sediment geochemistry, already acquired as parts of goal 3, in conjunction with macroscopic tephras and cryptotephras will enable in the extension the temporal and quantitative characterization of the sediment composition at the incoming plate in relation to the volcaniclastic input and possible slide masses.

在IODP探险期间，已经钻了372和375个沉积物，并将其采样至白垩纪，包括从中新世到全新世的嵌入式Tephra层。钻头位于太平洋，塔波火山区（TVZ）下风约250公里，这是地球上最大，最频繁的硅酸盐中心之一，也靠近Coromandel火山区（CVZ）一个稀疏研究的新元火山弧。这些中间远处的Tephra清单提供了近端（<〜100 km）陆地和非常不同（〜1000公里）ODP地点之间的缺失联系，以建立从中新世早期到新西兰的爆炸性爆炸性火山的几乎完整的爆发历史。在三个主要目标中，将调查其喷发产品和相关沉积物的早期提议，综合，临时和遗传差异。由于大流行状况使我们无法在新西兰进行实地工作，以帮助海洋工作，并妥协了我们的实验室工作和分析实验室的访问，我们在这里延迟并提出了6个月的工作，以确保6个月的工作，以确保6个月的工作和phd'和Phd and phd's and phd's。在该提案的前24个月中，该项目集中在新西兰和第四纪新西兰所有深部钻探地点期间新西兰高度爆炸性爆发的火山产品。我们将地球化学，岩石学和火山学方法用于Tephra和沉积物表征，以定量和定性地解密其出处和喷发成功，并充分实现了最初建议的目标1。 We successfully reconstructed the cyclic history of highly explosive volcanic activity of both arc systems (CVZ and TVZ) over a time span of about at least 13 Myrs (parts of goal 2) and will further address in the extension questions regarding Compositional and genetic differences and similarities, as well as recurrence rates and periodicities in both systems, covering for the first time also a Neogene eruption time series.与宏观tephras和Cryptotephras结合使用，已经作为目标3的一部分获得了散装岩石沉积物地球化学，将使延伸范围内的沉积物组合物在输入板上的临时和定量表征与火山层输入和可能的滑动质量有关。