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More - Mofette Research

更多 - 莫菲特研究

基本信息

批准号：
419880416
负责人：
Professor Johannes Barth, Ph.D.
金额：
--
依托单位：
Lehrstuhl für Angewandte Geologie
依托单位国家：
德国
项目类别：
Infrastructure Priority Programmes
财政年份：
2019
资助国家：
德国
起止时间：
2018-12-31 至 2020-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/419880416?language=en
关键词：
More Mofette Research

项目摘要

Mofettes are gas emission sites where CO2 ascends through conduits from as deep as the mantle to the Earth’s surface and as such provide natural windows to magmatic/volcanic processes at depth. The primary objective of the proposed research on mofettes is to clarify the physical link between fluid properties, their pathways and earthquakes. The suggested state-of-the-art fluid monitoring techniques allow for a high temporal resolution and are completely different from the discrete sampling approach used in the last decades. Gas composition and its isotope signature will be continuously analysed in-situ at different depth levels. Unique in the world, ascending mantle fluids will be tracked along a vertical gradient in a set of drillings from a depth of a few hundred metres to the surface. This can provide hints on the origin of temporal variations related to the opening of fault-valves, admixture of crustal fluids to a background mantle-flow or the release of hydrogen during fault rupturing. As a test area the Hartoušov mofette has been chosen as a key site. Detailed measurements before, during and after drilling of a 300 m deep well will be carried out to realize possible influences of the drilling activity on the local and regional fluid regime. Periodically, samples for noble gas isotope analysis will be collected. This proposal is directly linked to the drilling of the fluid-borehole scheduled for 2019 in the frame of the ICDP project “Drilling the Eger Rift: Magmatic fluids driving the earthquake swarms and the deep biosphere”.

莫费特是气体排放点，二氧化碳通过管道从地幔深处上升到地球表面，因此为深部的岩浆/火山过程提供了天然窗口。拟议中的莫菲特研究的主要目标是澄清流体性质、它们的路径和地震之间的物理联系。所建议的最先进的流体监测技术允许高时间分辨率，并且与过去几十年中使用的离散采样方法完全不同。将在不同深度的现场连续分析气体成分及其同位素特征。在世界上独一无二的，上升地幔流体将被跟踪沿着一个垂直梯度在一组钻井从几百米深的表面。这可以提供线索的时间变化的起源有关的断层阀的开放，地壳流体的混合物的背景地幔流或氢的释放在断层破裂。作为一个试验区，Hartoušov mofette被选为一个关键地点。将在钻300米深井之前、期间和之后进行详细测量，以了解钻井活动对当地和区域流体状况可能产生的影响。将定期收集惰性气体同位素分析样品。这项提议与计划于2019年在综合社区发展项目“钻探埃格裂谷：岩浆流体驱动震群和深层生物圈”框架内钻探流体钻孔直接相关。