SEIZE - SEismic imaging of the Ivrea ZonE

SEIZE - 伊夫雷亚 ZonE 地震成像

• 批准号: 437719147
• 负责人: Dr. Klaus Bauer
• 金额: --
• 依托单位: Sektion 2.2: Geophysikalische Abbildung des Untergrunds
• 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/437719147?language=en
• 关键词: SEIZE; SEismic; imaging; Ivrea; ZonE

SEIZE is the active seismics part of the ICDP-proposal DIVE (Drilling the IvreaVerbano ZonE) submitted to ICDP in January 2018; led by Othmar Müntener, U. of Lausanne, Switzerland (Co-PIs: Mattia Pistone – Lausanne, Luca Ziberna – Bayreuth, György Hetényi – Lausanne, Alberto Zanetti – Pavia). The Ivrea-Verbano Zone (IVZ) in the Italian Alps is one of the most complete and studied, time integrated archetype of continental crust–upper mantle section on Earth. Moreover, it provides the best natural laboratory to significantly advance our understanding of the continental lower crust and crust–mantle transition zone by a combination of geoscientific approaches and scientific drilling. At a workshop in May 2017 an international team of 31 investigators proposed a comprehensive Drilling program in the Ivrea Verbano ZonE (DIVE). Drilling two, 1km deep holes, and a 4-km deep hole in the IVZ will provide an unrivalled opportunity to link geophysical and geological data via core observations, downhole logging, microbiological sampling, hydrological studies, and various geophysical-geological surveys around the borehole area. The IVZ is unique in that several geophysical observables indicate near sub-surface (as shallow as 3 km) presence of high density, high seismic velocity rocks, commonly known as the “Bird’s Head”. Recent discoveries illustrate that the IVZ is a precious archive of trans-crustal continental magmatism documenting lower crustal processes of magma emplacement, crystallisation and crustal assimilation, and of the development of near surface magmatism including evidence for protracted super-eruptions during the Permian. Drilling will address long-standing questions on the nature of the continental lower crust and the crust–mantle transition, potential connections to the geophysical Ivrea body, the construction and organisation of a deep crustal magmatic systems, and a complete characterisation of physical and chemical rock properties and fabrics, the relation of permeability to weathering, alteration and fluid characterisation. Together with studies on the extent and diversity of the subsurface biosphere, these studies will contribute to advance our understanding of microbial ecosystems and its limits in various crystalline bedrocks. With SEIZE we aim within DIVE at delineating depth, extent and shape of the IVZ and the so-called “Bird’s-Head” at the Balmuccia site in Val Sesia, Italy. DIVE was rejected by ICDP on 13th June 2018 with the following request before resubmission: “ICDP would like to see for the Balmuccia site a section with good seismic data plus superimposed geological model(s) and tentative drill path”. SEIZE is addressing this request.

SEIZE是2018年1月提交给ICDP的ICDP提案DIVE（钻探IvreaVerbano ZonE）的主动地震勘探部分;由美国国防部长Othmar Müntener领导。（Co-PI：Mattia Pistone -洛桑，Luca Ziberna -拜罗伊特，György Hetényi -洛桑，Alberto Zanetti - Pavia）.意大利阿尔卑斯山的伊夫雷亚-韦尔巴诺带（IVZ）是地球上研究最完整、时间最完整的大陆地壳-上地幔剖面原型之一。此外，它提供了最好的天然实验室，通过地球科学方法和科学钻探相结合，大大提高我们对大陆下地壳和壳幔过渡带的认识。在2017年5月的一次研讨会上，一个由31名调查人员组成的国际团队提出了在Ivrea Verbano ZonE（DIVE）进行全面钻探的计划。在IVZ钻两个1公里深的孔和一个4公里深的孔，将提供无与伦比的机会，通过岩心观察、井下测井、微生物取样、水文研究和钻孔区域周围的各种水文地质调查，将地球物理和地质数据联系起来。IVZ的独特之处在于，几个地球物理观测结果表明，近地表（浅至3公里）存在高密度、高地震速度的岩石，通常被称为“鸟头”。最近的发现表明，IVZ是一个珍贵的跨地壳大陆岩浆活动档案，记录了岩浆就位，结晶和地壳同化的下地壳过程，以及近地表岩浆活动的发展，包括二叠纪长期超级喷发的证据。钻探将解决长期存在的问题，包括大陆下地壳和壳幔过渡的性质，与地球物理Ivrea体的潜在联系，深部地壳岩浆系统的构造和组织，物理和化学岩石性质和结构的完整表征，渗透性与风化，蚀变和流体特征的关系。这些研究与对地下生物圈的范围和多样性的研究一起，将有助于促进我们对微生物生态系统及其在各种结晶岩石中的局限性的理解。SEIZE的目标是在DIVE中描绘IVZ的深度，范围和形状以及意大利瓦尔塞西亚的巴尔穆恰遗址的所谓“鸟头”。 DIVE于2018年6月13日被ICDP拒绝，并在重新提交之前提出以下要求：“ICDP希望看到Balmuccia场地具有良好地震数据的剖面加上叠加的地质模型和暂定钻井路径”。 SEIZE正在处理这一请求。