The Oka complex is amongst the youngest carbonatite occurrences in North America and is associated with the Monteregian Igneous Province (MIP; Québec, Canada). The complex consists of both carbonatite and undersaturated silicate rocks (e.g., ijolite, alnöite), and their relative emplacement history is uncertain. The aim of this study is to decipher the petrogenetic history of Oka via the compos...

[1] We performed analyses of topographic variation (surface roughness) using a new 2-D mapping method which shows that understanding the relationship between data resolution, Hurst exponent, y intercept, RMS deviation, and cell size is important for assessing surface processes. We use this new method to assess flows at six field sites in Kilauea caldera, Hawaii, using three data sets at differe...

The Central Atlantic Magmatic Province (CAMP) has long been proposed as having a causal relationship with the end-Triassic extinction event (∼201.5 Ma). In North America and northern Africa, CAMP is preserved as multiple basaltic units interbedded with uppermost Triassic to lowermost Jurassic sediments. However, it has been unclear whether this apparent pulsing was a local feature, or if pulses...

Abstract High-resolution biomarker and compound-specific isotope distributions coupled with the degradation of calcareous fossil remnants reveal that intensive euxinia decalcification (acidification) driven by Central Atlantic magmatic province (CAMP) activity formed a two-pronged kill mechanism at end-Triassic mass extinction. In newly proposed extinction interval for basal Blue Lias Formation...

Introduction: A quantitative assessment is made of " cryovolcanism " as a resurfacing process on the saturnian moon Titan. The geologically young surface of Titan indicates that much resurfacing has taken place. However, to date, there has been no unambigu-ous detection of active " cryovolcanism " , such as the emplacement of a " cryolava " flow. The dense Titan atmosphere makes this kind of ob...

Introduction: Terrain analyses are commonly used to study the geomorphic processes that have modified surfaces [1]. Our approach is based on analysis of slopes, which are the irregular surface expressions of the processes responsible for shaping landscapes [2]. Slope distributions likely represent unique surface forming processes and can be used to characterize entire landscapes at a given scal...

in this paper, dynamical behavior of the delay mechanism of a special projectile controller is studied, using 3d finite element simulation. the controller considered here is among of high-acceleration mechanical controllers. due to high linear and angular accelerations of the projectile and also explosion risk, experimental investigation is very limited and almost impossible. so, numerical simu...