Rejuvenated volcanism is a worldwide phenomena occurring on many volcanic oceanic islands in all of the major ocean basins (e.g., Samoa, Madeira, Mauritius). This plume-related follows main edifice-building stage after hiatus variable duration 0.6–2 Myrs Hawai‘i). Hawaiian rejuvenated basalts typically have high MgO contents (>10 wt%) and carry upper mantle xenoliths . Thus, these magmas are as...

Abstract A first-order observation of convergent margin volcanism is that continental arc stratovolcanoes have substantially elevated incompatible element abundances and notable fractionations certain ratios compared to oceanic stratovolcanoes. Models account for these differences include (1) a greater influence differentiation contamination due thicker crust, (2) variable slab flux controlled ...

A Comparison of Theoretical Inferences for Magmatic Supply on Mars S. Baloga Relative Ages of Martian Volcanoes N. G. Barlow Martian Mantle Primary Melts C M. Bertka, Z R. Holloway, and V. Pan Magmatic Sulfides on Mars R. G. Bums Constraints on Eruption Rates and Cooling of Three Lava Flows at Alba Z Crisp Hadriaca Patera: Evidence for Pyroclastic Volcanism in the Hellas Region of Mars D.A. Cro...

Negative carbon and calcium isotope excursions, as well as cli-1 mate shifts, took place during the most severe mass extinction event in Earth's 2 history, the end-Permian (∼252 Ma). Investigating the connection between 3 carbon and calcium cycles during transient carbon cycle perturbation events, 4 such as the end-Permian, may help resolve the intricacies between the cou-5 pled calcium-carbon ...

Tephra layers in marine sediment cores from scientific ocean drilling largely record high-magnitude silicic explosive eruptions in the Japan arc for up to the last 20 million years. Analysis of the thickness variation with distance of 180 tephra layers from a global data set suggests that the majority of the visible tephra layers used in this study are the products of caldera-forming eruptions ...