ORANG · ORogenic cycle revised: Post-subduction tectonics at A contineNtal marGin
„Хоризонт 2020“ — Действия „Мария Склодовска-Кюри“
- Период
- 2019-03-27 → 2021-05-05
- Финансиране от ЕС
- 195 455 €
- Участници
- 1
- Схема
- MSCA-IF-EF-RI
Линиите свързват координатора с партньорите.
Накратко на български
Процесите в земната кора след спирането на субдукцията се анализират чрез пример с северна Борнео. Разбирането им помага да се обяснят еволюцията на континентите, вулканизмът, земетресенията и дългосрочното регулиране на климата.
Кратко обяснение, генерирано от езиков модел по текста на CORDIS. Оригиналът е по-долу.
Резултати накратко
ORogenic cycle revised: Post-subduction tectonics at A contineNtal marGin
The primary aim of ORANG was to understand what happens to the continental lithosphere when subduction of one tectonic plate beneath another terminates. Over the course of geological time, this has been a wide-spread phenomenon, with global implications for the growth and evolution of continental plates, long term climate regulation and natural hazards such as volcanos and earthquakes. Yet it has rarely been studied, and the dynamic processes and structural changes that take place in the crust and mantle during and after the cessation of subduction are poorly understood. One region of the world to have undergone two recent episodes of subduction termination is northern Borneo (eastern Malaysia), where subduction terminated in the last ~9 Ma. In order to directly address the knowledge gap in the subduction cycle, I proposed an observation-led, multi-disciplinary study that specifically targets a post-subduction setting. My results show how a downwelling lithospheric drip, developed after subduction termination, can stretch the crust in an adjacent mountain belt, causing lower crustal melting and possible exhumation of subcontinental material, which can explain intraplate volcanism, subsidence and subsequent uplift as seen in other areas of recent subduction termination.
Текст от CORDIS, на английски · Данни: CORDIS, © Европейски съюз
Цел на проекта
Subduction describes the process in which one tectonic plate descends into the mantle beneath an adjoining tectonic plate as a result of convergence. They play a fundamental role in the creation and evolution of the continents, the generation of new oceanic crust and the exchange of water between the Earth, oceans and atmosphere. Subduction zones are also the principal source of volcanic and seismic hazard around the globe. Despite having been the subject of intensive study by Earth Scientists from around the world, one aspect of the subduction cycle that has received little attention is the termination phase, where, for potentially a variety of reasons, the descent of the downgoing slab ceases. Given that all subduction zones have a finite lifetime, this process is likely to have profoundly influenced the way in which our continents have evolved, but to date no credible model has been developed for what might happen to the crust and upper mantle in such circumstances. This knowledge gap means that there is a unique and timely opportunity to provide new insight into this fundamental Earth process. I aim to make a step-change in our understanding of how post-subduction continental margins evolve and how the crust and upper mantle interact by combining seismic imaging, geodynamic modelling and geological observations in North Borneo (east Malaysia). The central objective of the proposal is to deploy a dense array of seismometers both onshore and offshore in North Borneo to record local and regional earthquakes, as well as ambient seismic noise, in order to image the underlying crust and mantle at high resolution. Our new multi-disciplinary study will allow us to build a model of how the continental lithosphere responds to subduction termination. As well as filling an important gap in our understanding of the subduction cycle and the evolution of the continents, our new model can be used as a benchmark for other post-subduction settings around the world.
Оригинален текст от CORDIS (на английски).
Участници
- THE CHANCELLOR MASTERS AND SCHOLARS OF THE UNIVERSITY OF CAMBRIDGE · CAMBRIDGEКоординаторОбединеното кралство
Връзки
Данни: CORDIS, © Европейски съюз