Abstract The Triassic tectonic setting of the Tethyan Himalaya in southern Tibet remains controversial and is key to revealing mechanism Neo-Tethys Ocean opening breakup history Gondwana. This paper reports 227–225 Ma mafic volcanic rocks interbedded within sequence Tibet, which were formed a typical passive continental margin setting. basalts are tholeiitic with high TiO2 (3.20–3.38 wt%) moder...

Textural, major element and trace element data for xeno-liths from Salt Lake Crater, Hawaii indicate that typical four phase lherzolite inclusions (olivine, orthopyroxene, chrome diopside and spinel) found worldwide in basalts are not samples of primitive upper mantle. Rather, lherzolite may be the recrystallized residue left after a basaltic melt extracts the easily fused components from pre-e...

[1] Among volcanic hot spots globally, Hawaii has the highest magma flux, yet there is significant controversy surrounding the composition of the mantle sourcing Hawaiian lavas. In order to place constraints on the source lithologies of Hawaiian lavas, we explore relationships between major elements and radiogenic isotopes in tholeiitic, shield-building lavas. Olivine-fractionation corrected la...

Abstract The Central Asian Orogenic Belt (CAOB) is one of the largest accretionary orogens on Earth and preserves evidence that more than 50% this orogen represents juvenile crustal growth over an extended period some 750 million years from ca. 1000 Ma to 250 Ma. However, mechanism controversial, as implied by a variety proposed models ranging contributions mantle-derived basaltic underplating ...

The North Tabriz Fault is seismologically an active fault with current right lateral strike-slip movements. Restricted mafic to intermediate Late Cretaceous igneous rocks are exposed along the North Tabriz Fault. Whole rock samples and clinopyroxene phenocrysts geochemistry were studied in order to characterize the petrogenesis of these mafic rocks and their possible relation to an oceanic crus...

The origin and geodynamic setting of the Maden Complex, which is situated in the Bitlis–Zagros Suture Zone in the Southeast Anatolian Orogenic Belt, is still controversial due to lack of systematic geological and geochemical data. Here we present new whole rock major–trace–rare earth element data from the Middle Eocene volcanic rocks exposed in Maden Complex and discuss their origin in the ligh...

Piton de la Fournaise is an active shield volcano located in the eastern area of Réunion Island (Indian Ocean) whose activity characterized by effusive and explosive episodes with emission scarcely differentiated magmas mostly tholeiitic affinity. The presently edifice has grown within Enclos Fouqué caldera, a polylobate plain bounded on its western side 80–200 m high Bellecombe vertical cliffs...

In order to study the basic mechanical properties of basalt fiber reinforced recycled aggregate concrete, the concrete mix ratio, the length and the volume mixing ratio of chopped basalt fiber yarn are designed for changing factors. A total of 324 specimens have been completed for this investigation. The compressive strength, splitting tensile strength, elastic modulus and axial compressive str...

The Cenozoic Hannuoba basaltic province, 200 km northwest of Beijing, China, is composed of intercalated tholeiitic, transitional and alkalic basalts. Although the alkalic basalts contain abundant upper mantle xenoliths, they range in MgO content from 5.7 to 10.6% MgO. Most of the major and trace element abundance variations in the alkalic basalts can be explained by segregation of a clinopyrox...

The Alada? melange is located between Mesozoic Tauride carbonate platform units and the Late Cretaceous Pozant?-Karsant? ophiolite its metamorphic sole. comprises a lower, mainly sedimentary unit, composed of variably disrupted thrust sheets deep-sea sediments, with localized matrix mass-flow turbidity current deposits. upper, volcanic-sedimentary highly basalt-pelagic carbonate-radiolarite uni...