Seismic imaging of subduction of continental crust beneath the Pamir

Continental crust beneath southeast Iceland.

The magmatic activity (0-16 Ma) in Iceland is linked to a deep mantle plume that has been active for the past 62 My. Icelandic and northeast Atlantic basalts contain variable proportions of two enriched components, interpreted as recycled oceanic crust supplied by the plume, and subcontinental lithospheric mantle derived from the nearby continental margins. A restricted area in southeast Icelan...

Seismic images of crust and upper mantle beneath Tibet: evidence for Eurasian plate subduction.

Seismic data from central Tibet have been combined to image the subsurface structure and understand the evolution of the collision of India and Eurasia. The 410- and 660-kilometer mantle discontinuities are sharply defined, implying a lack of a subducting slab beneath the plateau. The discontinuities appear slightly deeper beneath northern Tibet, implying that the average temperature of the man...

Seismic Imaging of Microblocks and Weak Zones in the Crust Beneath the Southeastern Margin of the Tibetan Plateau

Elemental composition of concentrated brines in subduction zones and the deep continental crust

It has been well established that fluids played an important part in determining chemical characteristics in many crustal terranes. Studies of fluid inclusions in eclogites have established that brines coexisted with the primary mineral assemblages during their metamorphic crystallization. These brines are currently multiply saturated in halide salts, carbonates, oxides, and sulfides. As a firs...

Data for Seismic properties of the Nazca oceanic crust in southern Peruvian subduction system

This supplementary file describes (1) data processing for teleseismic receiver function (RF), (2) RF amplitude inversion, and (3) calculation of velocities of candidate phases from experimental mineral physics data. 1. Data processing for teleseismic receiver function Identification of strong and sharp amplitudes of the P-to-S converted phase (hereafter, Ps) is crucial in this analysis. We try ...