Review Of Subduction Slabs Study : From A Variety Of Observations

1236 Words Dec 2nd, 2014 5 Pages
Review of Subduction Slabs Study: From a variety of observations

Prepared by: Yang Yang
September 25, 2014

Abstract

Subduction zones are sites of convective downwelling of Earth’s lithosphere, which provides the dominate force of the driving force for mantle convection. It is through subducted slabs that oceanic crust and sediments, including volatile compounds are recycled back into mantle. Studying subduction slab is one of the most important parts of studying lithosphere dynamics. There have been a number of recent reviews of subduction zones with some specifically focusing on seismology, the mantle wedge, phase changes, the fate of slabs and water in mantle. However, in this review, I attempt to provide a broad summary that emerges from recent observations and model of subduction. Our understanding of the geometry and composition of subducted slabs, as well as the physical process of subduction, comes from indirect observation including earthquake seismology, gravity, topography, geochemistry, and petrology of island arc lavas. Also, numerical calculations of the dynamics of subducted slabs and slab thermal models also play an important role to test the model we build based on our observations. This review will include most of recent studies on these aspects. Finally, I will try to sum up the challenges on our future study of subduction slabs.

Slab Geometry Study from seismology

In history, the geometry of subducted slab is studied by earthquake hypocenter and…
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