Recently, a number of source-side shear wave splitting measurements that directly constrain anisotropy in the upper mantle beneath subducting slabs have been published. Such measurements have yielded an observational foundation on which to base our understanding of the dynamics of the sub-slab mantle. Here we compile measurements from recent studies of source-side splitting beneath slabs that e...

[1] Abstract: Peridotite xenoliths erupted in late Miocene basalts ( 8 Ma) in the central Sierra Nevada sample a lithosphere that is vertically stratified in terms of age and thermal history. The deeper portions ( 45–100 km) have asthenospheric osmium isotopic compositons and possess textural and chemical evidence for cooling from >11008 to 700–8208C. The shallower portions (<60 km) have unradi...

Tectonic plates are thought to move above the asthenosphere due presence of accumulated melts or volatiles that result in a low-viscosity layer, known as lithosphere–asthenosphere boundary (LAB). Here, we report experiments suggesting may slide through solid-state mechanism. Ultrafine-grained aggregates Mg2GeO4 and minor MgGeO3 were synthetized using spark plasma sintering (SPS) deformed 1-atm ...

Lithospheric discontinuities, including the lithosphere-asthenosphere boundary (LAB) and enigmatic mid-lithospheric discontinuities (MLDs), hold important clues about structure evolution of tectonic plates. However, P- S-receiver-function (PRF SRF) techniques, two traditional techniques to image Earth's deep have some shortcomings in imaging lithosphere discontinuities. Here, we propose a new m...

Extensive intraplate volcanism in the East Asia regions, including Dokdo and Ulleungdo (DU), occurred due to extensional stress field during Cenozoic era. However, origin of magmatism is still controversial. Here we report new results helium isotopes olivine clinopyroxene phenocrysts as well major trace element compositions from DU basalts order determine magmas provide insights into mantle dyn...

We investigate melt generation in a slowly extending lithosphere with the aim of understanding the spatial and temporal relationships between magmatism and preexisting rift systems. We present numerical models that consider feedback between melt generation and lithospheric deformation, and we incorporate three different damage mechanisms: brittle damage, creep damage, and melt damage. Melt cond...

Direct observation and extensive sampling in ancient margins exposed in the Alps, combined with drillhole and geophysical data from the present-day Iberia margin, result in new concepts for the strain evolution and near-surface response to lithospheric rupturing at magmapoor rifted margins. This paper reviews data and tectonic concepts derived from these two margins and proposes that extension,...

This study presents a geophysical-geochemical integrated model of the thermochemical structure lithosphere and uppermost mantle along transect from Northern Tyrrhenian Sea to Pannonian Basin, crossing northern Apennines, Adriatic Sea, Dinarides fold-thrust belt. The objectives are image crustal thickness variations characterize different domains. In addition, we evaluate topographic response op...