The Chaqiabeishan area is characterized by small Li-rich granitic pegmatites in the Quanji Massif (QM), northwest China. In this study, columbite-tantalite group minerals (CGMs) from a typical pegmatite dike were analyzed for major element contents using an EMPA (electron microprobe analyzer), trace LA-ICP-MS (laser ablation-inductively coupled plasma mass spectrometry), and ages U-Pb dating, r...

Introduction: Glaze et al. [1] and Baloga et al. [2] have both recently indicated the importance of understanding the scale of a lava flow relative to the surrounding topography in extracting inferences about rheologic changes and the interpretation of the style of emplacement. The underlying scientific issue is whether flow emplacement is controlled by the largescale topographic inclination or...

One of the main reasons for bridge failure is local scour at abutments. Laboratory experiments, under clear water condition, were carried out to investigate reduction around vertical abutment by adding one upstream spur dike. Sand with a median and standard deviation diameter equal 0.80 mm 2.173 respectively, formed bed material. Three different stages dikes varying sets as: 1) distances from (...

[1] We present new evidence for volcanic eruptions and lava flow emplacement on Venus within the last several decades. An integrated study of a radar‐dark lava flow unit in Bereghinia Planitia on Venus (∼28°E, ∼39°N) based on Magellan data obtained in 1993 reveals a significant apparent microwave thermal emission excess, consistent with increased subsurface temperature due to very recent lava f...

[1] We use the identification of volcanism on Mercury, together with lobate, flow-front like topography, crustal composition information and data on the stress state and history of the lithosphere, to derive a new model for the ascent and eruption of magma on Mercury. We find that extrusion is likely to be dominated by high-effusion rate events. Initial emplacement of dikes in the crust and ext...

Abstract The 180,000 km 2 of Arabian lava fields (“harrats” in Arabic) form one the largest distributed basaltic provinces world. most recent eruption 1256 AD, on outskirts Medina, as well shallow dike emplacement 2009, ~ 200 northeast city, suggest future volcanic threat to this area. Harrat Khaybar (~ 1.7 Ma present) is and compositionally diverse fields; it located 137 Medina covers 14,000 ....