Melt inclusion vapour bubbles: the hidden reservoir for major and volatile elements
Swetha Venugopal1,2, Federica Schiavi3, Severine Moune3,4,5
1Department of Earth Sciences, Simon Fraser University, Burnaby, Canada. swethav@sfu.ca.
Scientific Reports
|June 5, 2020
Summary
Reheating melt inclusions (MIs) can alter their volatile content, creating new phases within bubbles. Analyzing only the glass underestimates the original magma composition and storage parameters.
Area of Science:
- Geochemistry
- Volcanology
- Petrology
Background:
- Olivine-hosted melt inclusions (MIs) are crucial for studying magmatic liquids and volatiles.
- Post-entrapment modifications can alter MI glass and bubble compositions.
- Reheating is used to reverse MI crystallization, but its effect on volatiles is debated.
Purpose of the Study:
- To investigate the impact of reheating on volatile and fluid phases within melt inclusions.
- To assess compositional changes in bubbles of both re-heated and naturally glassy MIs.
- To determine if analyzing glass alone underestimates original magma composition.
Main Methods:
- Analysis of crystallised and glassy basaltic MIs.
- Raman spectroscopy for fluid and solid phase identification.
- 3D imaging to study bubble contents before and after re-heating.
Main Results:
- Reheating MIs causes diffusion of elements, forming new phases (SO2, gypsum, Fe-sulphides) within bubbles.
- Naturally glassy MIs also contain solid phases (carbonates, sulphates, sulphides) sequestering significant volatiles (S, CO2, FeO).
- Bubbles in both types of MIs sequester elements, leading to a 'loss' from the glass.
Conclusions:
- Reheating significantly alters MI volatile content and bubble composition.
- Melt inclusion bubbles act as sinks for key magmatic components.
- Glass analysis alone provides an incomplete picture of magma composition and storage.
Related Concept Videos
01:10Volatilization
4.2K
Volatilization gravimetry is an analytical technique that measures the mass lost due to the volatilization of the substance. This technique is used to estimate the amount of volatile material in a sample. To perform this method, heat a known amount of the sample to a high temperature in a crucible or other suitable vessel. The volatile substance in the sample evaporates, and the vapor is completely expelled from the crucible either by heating the sample or bubbling a stream of inert gas through...
4.2K
01:01Distillation: Vapor–Liquid Equilibria
4.2K
Distillation is a separation technique that takes advantage of the boiling point properties of disparate elements in a mixture. To perform distillation, we begin by heating a miscible mixture of two liquids with a significant difference in boiling points (at least 20°C). As the solution heats up and reaches the bubble point of the more volatile component, some molecules of the more volatile component transition into the gas phase and travel upward into the condenser, which is a glass tube...
4.2K
01:27Cell Inclusions
629
Prokaryotic cells possess a variety of inclusions that play crucial roles in nutrient storage, metabolic processes, and environmental adaptation. These structures enable bacteria to thrive under fluctuating environmental conditions by storing essential resources and optimizing their metabolic efficiency.Carbon Storage: Poly-β-Hydroxybutyric Acid and Glycogen GranulesBacteria frequently store excess carbon in specialized granules. Poly-β-hydroxybutyric acid (PHB) granules are lipid...
629
03:46Qualitative Analysis
23.5K
For solutions containing mixtures of different cations, the identity of each cation can be determined by qualitative analysis. This technique involves a series of selective precipitations with different chemical reagents, each reaction producing a characteristic precipitate for a specific group of cations. Metal ions within a group are further separated by varying the pH, heating the mixture to redissolve a precipitate, or adding other reagents to form complex ions.
For instance, group IV...
For instance, group IV...
23.5K
02:39Phase Transitions: Vaporization and Condensation
20.3K
The physical form of a substance changes on changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. Vaporization occurs when the thermal motion of the molecules overcome the intermolecular forces, and the molecules (at the surface) escape into the gaseous state. When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules...
20.3K
01:18Vaporization
37.0K
The physical form of a substance changes by changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. For vaporization to occur, kinetic energy must be greater than the intermolecular forces that keep molecules bonded. The amount of energy needed to vaporize a quantity of liquid at a given pressure and a constant temperature is called the heat of vaporization. When...
37.0K