Magellan data show that the surface of Venus is dominated by volcanic landforms including large flow fields and a wide range of volcanic edifices that occur in different magmatic and tectonic environments. This study presents the results from a comprehensive survey of volcano– rift interaction in the BAT region and its surroundings. We carried out structural mapping of examples where interactio...

Ophiolites are the remnants of ancient oceanic crust and upper mantle that were tectonically emplaced into continental margins. They display the only evidence for magmatic, tectonic, and hydrothermal processes associated with seafl oor spreading prior to 170 Ma because no oceanic lithosphere older than this age is preserved in the modern oceans. The occurrence of sheeted dikes, side-byside tabu...

The Truong Son orogenic belt (TSOB) is one of the most important belts in Indochina block. There are numerous mafic to felsic intrusions Early Paleozoic caused by Tethyan orogeny. However, tectono-magmatic evolution TSOB still unclear. In this paper, zircon U-Pb dating, whole-rock geochemistry, and Sr-Nd isotopic data magmatic rocks have been systematically investigated explore petrogenesis tec...

Cretaceous represents one of the hottest greenhouse periods in the Earth's history, but some recent studies suggest that small ice caps might be present in non-polar regions during certain periods in the Early Cretaceous. Here we report extremely negative δ(18)O values of -18.12‰ to -13.19‰ for early Aptian hydrothermal zircon from an A-type granite at Baerzhe in northeastern China. Given that ...

The Godthåbsfjord region of West Greenland contains the most extensive, best exposed and most intensely studied early Archean rocks on Earth. A geological record has been described of numerous magmatic events between ~3.9 and 3.6 Ga, and evidence of life at >3.85 Ga and ~3.8-3.7 Ga has been proposed from two widely-separated localities. Some of these claims have recently been questioned, and th...

Mafic Mound” is a distinctive and enigmatic feature 75 km across and 1km high near the center of the vast South Pole-Aitken Basin (SPA). Using several modern data sets, we characterize the composition, morphology, and gravity signature of the structure in order to assess its origin. Mafic Mound is found to exhibit a perched circular depression and a homogeneous high-Ca pyroxene-bearing composit...

The Open University's repository of research publications and other research outputs Late Cretaceous (81Ma) high-temperature metamorphism in the southeastern Lhasa terrane: implication for the Neo-Tethys ocean ridge subduction. (2013). Late Cretaceous (81Ma) high-temperature metamorphism in the southeastern Lhasa terrane: implication for the Neo-Tethys ocean ridge subduction. Tectonophysics, 60...

Experimental data on the structure and properties of melts and fluids relevant to water-melt interaction in hydrous magmatic systems in the Earth's interior have been reviewed. Complex relationships between water solubility in melts and their bulk composition [Al/Si-ratio, metal oxide/(Al + Si) and electron properties of metal cations] explain why water solubility in felsic magmas such as those...