How do olivines record magmatic events? Insights from major and trace element zoning

Influence of Magmatic Assimilation on Mineral Growth and Zoning

We explore the potential effects of magmatic assimilation on mineral growth and mineral zoning in an alkali olivine basaltic magma using both equilibrium thermodynamics and kinetics. The equilibrium-model calculations simulate fractional crystallization alone (closed system) and coupled assimilation fractional crystallization (AFC) (open system); the models predict the assemblages ofmagmatig mi...

How do teachers teach? Insights from teachers and students

Minor and Trace Element Zoning in Pallasite Olivine: Modeling Pallasite Thermal History

Introduction: Pallasites are stony-iron meteorites that consist of comparable volumes of olivine and Fe-Ni metal. It is widely believed that pallasites were formed at the interface of the metallic core and peridotitic mantle in differentiated asteroid(s) [1,2]. Fe-Ni metal in pallasites exhibits Widmanstätten structure indicative of slow cooling (~10 C/yr) [3,4]. These metallographic cooling ra...

Modeling Major and Trace Element Chemistry of Zoned Metal Grains

Introduction: The compositional variations [1 and references therein] in the zoned metal grains from the CH and CB chondrites are generally interpreted as unequivocal evidence for their condensation from a parcel of H 2-rich gas with solar or somewhat increased dust/gas (D/G) ratios [2,3]. Although different origins of such gas are discussed [e.g., 4-7], its high enrichment in H 2 [8] and low a...

A study of cathodoluminescence and trace element compositional zoning in natural quartz from volcanic rocks: mapping titanium content in quartz.

This article concerns application of cathodoluminescence (CL) spectroscopy to volcanic quartz and its utility in assessing variation in trace quantities of Ti within individual crystals. CL spectroscopy provides useful details of intragrain compositional variability and structure but generally limited quantitative information on element abundances. Microbeam analysis can provide such informatio...