H2020Индивидуална стипендия2015–2017

DEEPER · Deep Earth Elastic Properties and Effective Rheology

„Хоризонт 2020“ — Действия „Мария Склодовска-Кюри“

Период: 2015-07-30 → 2017-07-29
Финансиране от ЕС: 183 455 €
Участници: 1
Схема: MSCA-IF

Линиите свързват координатора с партньорите.

Накратко на български

Зоните с ултраниска скорост на границата между ядрото и мантията на Земята се анализират, за да се разбере дали те се състоят от разтопени скали или железни твърди тела. Това помага за разбирането на топлинната и химическа еволюция на планетата.

Този кратък обзор е генериран от изкуствен интелект

Кратко обяснение, генерирано от езиков модел по текста на CORDIS. Оригиналът е по-долу.

Резултати накратко

Deep Earth Elastic Properties and Effective Rheology

The Earth core-mantle boundary, is marked with a patchwork of structures with an anomalous seismic signature. The speed of seismic shear waves slow down substantially as they travel through these structures, also known as UltraLow Velocity Zones (ULVZs). Despite a number of observational and laboratory simulations of the ULVZs, two questions still remain unanswered: (a) is the seismic signature of the ULVZ caused by Fe-rich solids or partial melts? and (b) what is the internal structure of the ULVZs. The work in this project was aimed at addressing these two crucial questions using an array of new theoretical and numerical models in computational multiphase flow. The outcome of this project will be beneficial to a large group of Earth scientists studying the thermal and chemical evolution of the Earth, high performance computational scientists, and those studying fluid mechanics. The overall objectives of this project was to understand the relative influence of melting vs solid state composition on the physical properties of the ULVZs and studying the effect of convective motion in the lower mantle on the internal structure of the ULVZs.

Текст от CORDIS, на английски · Данни: CORDIS, © Европейски съюз

Цел на проекта

The interface between the Earth’s rocky mantle and molten outer core, located 2900 km below the surface, is marked by a patchwork of enigmatic structures. These structures, revealed by anomalous reductions in the speed of traveling seismic waves, are characterized by high density, partial melting, and low topographic heights (10-40 km above the core-mantle boundary). Due to the low seismic wave speeds, they are called UltraLow Velocity Zones (ULVZs). Since their ﬁrst discovery in the 90s, our understanding of the ULVZs has been based on seismic observations. The inﬂuence of microscale distribution of melt and minerals on the seismic signature and the internal structure of the ULVZs remain a challenging question in geophysics. To address this question, this project will use a cross-scale approach to quantify the inﬂuence of partial melting and solid composition on the elastic properties and rheology of the UL-VZs based on a microstructural model. Using the microscale constraints on the physical properties, the km-scale internal structure of the ULVZs will be simulated using a ﬁnite elements model.The interdisciplinary approach of this project relies on using state-of-the-art high performance computational ﬂuid mechanics models to answer fundamental questions in Earth Sciences. The uniqueness of this approach arises from the special consideration of microstructures, a crucial, but difﬁcult to quantify aspect in Earth sciences. The multidisciplinary aspect of this work will train the researcher in new modeling skills. Upon his return to India, where research in deep Earth is still in its infancy, the researcher will be able to establish his own research agenda leading the country’s effort in that area. Continued inter-national collaboration between the host institution and the researcher’s future group will be of enduring value to the EU.

Оригинален текст от CORDIS (на английски).

Участници

ROYAL HOLLOWAY AND BEDFORD NEW COLLEGE · EGHAMКоординаторОбединеното кралство