Seismic hazard in continental rifts varies as a function of strain accommodation by tectonic or magmatic processes. The nature of faulting in the Sevier Desert, located in eastern Basin and Range of central Utah, and how this faulting relates to the Sevier Desert Detachment low-angle normal fault, have been debated for nearly four decades. Here, we show that the geodetic signal of extension acr...

Unlike the other terrestrial planets, Earth has a substantial silica-rich continental crust with bulk andesitic composition. A small number of meteorites compositions have been identified that are thought to be products partial melting chondritic protoliths, mode petrogenesis distinct from Earth’s crust. Here we show, using geochemical analyses, unlike known meteorites, Erg Chech 002 strongly f...

The remnant rear-arc segment of the early Izu-Bonin arc, known as Kyushu-Palau Ridge (KPR), is a key location where magmatic outputs can be constrained during lifetime an island arc. We present new geochemical data for coarse-grained basaltic to andesitic volcaniclastic sandstones derived from KPR and deposited in Amami Sankaku Basin (IODP Site U1438, Unit III rocks) time period 40–30 Ma. Bulk ...

Abstract Abundant silica-undersaturated potassic lavas are found in the centre of Turkish–Iranian plateau (NW Iran) as flows, pillows and dykes. They display abundant zoned clinopyroxene macrocrysts xenoliths igneous cumulates. We determined four types crystals (Type-I, -II, -III -IV) on basis their composition zoning patterns. Use situ compositional data, together with whole-rock major trace e...

Abstract The southeastern Central Asian Orogenic Belt (CAOB) records the assembly process between several micro-continental blocks and North China Craton (NCC), with consumption of Paleo-Asian Ocean (PAO), but whether S-wards subduction PAO beneath northern NCC was ongoing during Carboniferous–Permian time is still being debated. A key issue to resolve this controversy Carboniferous magmatism i...

Abstract The Wrangell Arc in Alaska (USA) and adjacent volcanic fields the Yukon provide a long-term record of interrelations between flat-slab subduction Yakutat microplate, strike-slip translation along Denali–Totschunda–Duke River fault system, magmatism focused within proximal to Cretaceous suture zone. Detrital zircon (DZ) U-Pb (n = 2640) lithic (DARL) 40Ar/39Ar dates 2771) from 30 modern ...

‘I fact, just about everything that was taught as recently as ten years ago about granitic magmatism has been turned on its head.’1 So concludes John Clemens in his overview paper about the origin of granite, published in the UK in the Proceedings of the Geologists’ Association. In his introduction to Clemens’s paper and the accompanying discussion, editorial board member W.J. French explains t...