[1] The 3D Vp, Vp/Vs, Pand S-wave attenuation structure of the Cocos subduction zone in Mexico is imaged using earthquakes recorded by two temporary seismic arrays and local stations. Direct P wave arrivals on vertical components and direct S wave arrivals on transverse components from local earthquakes are used for velocity imaging. Relative delay times for P and PKP phases from teleseismic ev...

Abstract Continental arcs grow primarily by addition of mantle-derived magmas, thus forming juvenile crust, although geophysical evidence, alongside field investigation exhumed terranes, show that supracrustal rocks are common components the lower portions continental arcs. The mechanisms which metasedimentary transported to deep arc crusts and their contributions ambiguous. Here, we conduct a ...

A significant fraction of the ocean floor is created in back-arc basins, where water plays a major role generating basin basalts, contrasting strikingly with magmatic processes at mid-oceanic ridges. Furthermore, much our understanding all oceanic crust comes from ophiolites, which are largely attributed to supra-subduction zone environments. Therefore, studying lower and uppermost mantle argua...

The Western Liaoning area, where a large number of Jurassic-Cretaceous volcanic rocks are exposed, is one the typical areas for studying Mesozoic Paleo-Pacific and Mongolia-Okhotsk subduction process, lithospheric destruction North China Craton. identification investigation Early Jurassic adakitic in Xintaimen area particular significance exploring magma source its composition evolution, tracki...

Abstract. Shortwave radiation penetrating beneath an ice-sheet surface can cause internal melting and the formation of a near-surface porous layer known as weathering crust, dynamic hydrological system that provides home to impurities microbial life. We develop mathematical model, incorporating thermodynamics population dynamics, for evolution such layers. The model accounts conservation mass e...

The garnet megacrysts of Gore Mountain (Adirondacks, US) are world-renown crystals due to their size, up 1 m in historical record, which makes them the largest known garnets on planet. We show here that they also host first primary inclusions trondhjemitic melt found natural mafic rocks. petrological and experimental investigation inclusions, coupled with phase equilibrium modelling, shows this...

The appearance of the earliest felsic crust can be estimated by dating zircons and rocks tonalite-trondhjemite-granodiorite (TTG) composition. However, necessary geodynamic processes that form basis for metamorphism differentiation as well role emerging TTG on evolving crustal dynamics is still poorly understood. To investigate formation with composition, we conduct a detailed analysis series p...

The late Mesozoic destruction of the eastern North China Craton (NCC) resulted from intense crust-mantle interaction, culminating in formation world-class gold deposits Jiaodong Peninsula at ca. 120 Ma. We present zircon U-Pb geochronological data, Hf isotopic compositions, whole-rock major and trace element, Sr-Nd-Pb compositions for two suites granitoids: one (the Linglong suite) that hosts s...

Lower crust-derived granitic rocks provide constraints on the crustal reworking process and consequently give hints destruction mechanism of cratons. The North China Craton (NCC) underwent extensive melting in Mesozoic. This study investigated intrusions Dazeshan region Jiaodong Peninsula. Whole-rock major trace element analyses zircon U-Pb ages coupled with Hf isotopes were used to reveal proc...

Composition, mean pressure, mean melt fraction, and crustal thickINTRODUCTION ness of model mid-ocean ridge basalts (MORBs) are calculated Comparison of observed basalt compositions with the using MELTS. Polybaric, isentropic batch and fractional melts predictions of polybaric mantle melting models places from ranges in source composition, potential temperature, and final important restrictions...