scholarly journals Quantifying magmatic volatiles by Raman microtomography of glass inclusion-hosted bubbles

2020 ◽  
Vol 16 ◽  
pp. 17-24
Author(s):  
F. Schiavi ◽  
N. Bolfan-Casanova ◽  
R. Buso ◽  
M. Laumonier ◽  
D. Laporte ◽  
...  
Keyword(s):  
Glass Inclusion ◽  
Magmatic Volatiles

scholarly journals Effect of Microwave Processing and Glass Inclusions on Thermoelectric Properties of P-Type Bismuth Antimony Telluride Alloys for Wearable Applications

Energies ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 4524
Author(s):  
Amin Nozariasbmarz ◽  
Daryoosh Vashaee
Keyword(s):  
Seebeck Coefficient ◽  
Thermoelectric Materials ◽  
Room Temperature ◽  
Electronic Devices ◽  
Microwave Processing ◽  
Glass Inclusion ◽  
Wearable Electronic ◽  
P Type ◽  
Wearable Electronic Devices ◽  
Body Heat

Depending on the application of bismuth telluride thermoelectric materials in cooling, waste heat recovery, or wearable electronics, their material properties, and geometrical dimensions should be designed to optimize their performance. Recently, thermoelectric materials have gained a lot of interest in wearable electronic devices for body heat harvesting and cooling purposes. For efficient wearable electronic devices, thermoelectric materials with optimum properties, i.e., low thermal conductivity, high Seebeck coefficient, and high thermoelectric figure-of-merit (zT) at room temperature, are demanded. In this paper, we investigate the effect of glass inclusion, microwave processing, and annealing on the synthesis of high-performance p-type (BixSb1−x)2Te3 nanocomposites, optimized specially for body heat harvesting and body cooling applications. Our results show that glass inclusion could enhance the room temperature Seebeck coefficient by more than 10% while maintaining zT the same. Moreover, the combination of microwave radiation and post-annealing enables a 25% enhancement of zT at room temperature. A thermoelectric generator wristband, made of the developed materials, generates 300 μW power and 323 mV voltage when connected to the human body. Consequently, MW processing provides a new and effective way of synthesizing p-type (BixSb1−x)2Te3 alloys with optimum transport properties.

Magmatic volatiles in explosive rhyolitic eruptions

1981 ◽  
Vol 8 (7) ◽  
pp. 757-760 ◽  
Author(s):  
J. C. Eichelberger ◽  
H. R. Westrich
Keyword(s):  
Magmatic Volatiles

scholarly journals EXPEDITIONAL EXPLORATION OF THE KURIL ISLANDS IN 2020

2020 ◽  
Vol 4(48) ◽  
pp. 101-107
Author(s):  
E.G. Kalacheva ◽  
Keyword(s):  
Diffusion Flux ◽  
Field Work ◽  
Hydrothermal Activity ◽  
Kuril Islands ◽  
Thermal Fields ◽  
Analytical Work ◽  
Magmatic Volatiles ◽  
The Kuril Islands ◽  
Volcanic Islands ◽  
Relationship Of

This report provides a brief description of the field work on the Kuril Islands. It was performed within the framework of the R&D theme, projects of the RSF and the RFFR, which are realized in the laboratory of postmagmatic processes of the Institute of Volcanology and Seismology FEB RAS. Hydrological and hydrochemical works were performed on the rivers draining the slopes and thermal fields of the Sinarka, Kuntomintar volcanic massifs (Shiashkotan Island), and the Vernadsky and Karpinsky Ridges (Paramushir Island). The study of the chemical erosion of volcanic islands and the assessment of the hydrothermal export of magmatic volatiles are the goals of this work. Infrared photography was taken and the total flux of volcanic SO2 and diffusion flux of CO2 were measured on thermal fields in the caldera of Golovnin volcano. A detailed hydrogeochemical survey was made on the thermal fields of the Ebeko volcano to study the relationship of volcanic and hydrothermal activity of the volcano. For further analytical work, a large number of water and gas samples were taken and a representative collection of rocks and sediments was collected during the expedition.

Magmatic Volatiles and Rheology

1984 ◽  
pp. 35-58
Author(s):  
Richard V. Fisher ◽  
Hans-Ulrich Schmincke
Keyword(s):  
Magmatic Volatiles

Magmatic Volatiles

2021 ◽  
pp. 301-312
Author(s):  
Paul J. Wallace
Keyword(s):  
Magmatic Volatiles

scholarly journals Hydrothermal Aluminum-Phosphate-Sulfates in Ash from the 2014 Hydrothermal Eruption at Ontake Volcano, Central Honshu, Japan

Minerals ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 462 ◽  
Author(s):  
Takumi Imura ◽  
Yusuke Minami ◽  
Tsukasa Ohba ◽  
Akiko Matsumoto ◽  
Antonio Arribas ◽  
...  
Keyword(s):  
Single Phase ◽  
Porphyry Copper ◽  
Aluminum Phosphate ◽  
Active Volcano ◽  
Hydrothermal Systems ◽  
Ontake Volcano ◽  
X Ray ◽  
Argillic Alteration ◽  
Hydrothermal Eruption ◽  
Magmatic Volatiles

Aluminum-phosphate-sulfates (APS) of the alunite supergroup occur in igneous rocks within zones of advanced argillic and silicic alteration in porphyry and epithermal ore environments. In this study we report on the presence of woodhouseite-rich APS in ash from the 27 September 2014 hydrothermal eruption of Ontake volcano. Scanning electron microscope coupled with energy dispersive X-ray spectrometer (SEM-EDS) and field emission (FE)-SEM-EDS observations show two types of occurrence of woodhouseite: (a) as cores within chemically zoned alunite-APS crystals (Zoned-alunite-woodhouseite-APS), and (b) as a coherent single-phase mineral in micro-veinlets intergrown with similar micro-veinlets of silica minerals (Micro-wormy-vein woodhouseite-APS). The genetic environment of APS minerals at Ontake volcano is that of a highly acidic hydrothermal system existing beneath the volcano summit, formed by condensation in magmatic steam and/or ground waters of sulfur-rich magmatic volatiles exsolved from the magma chamber beneath Mt. Ontake. Under these conditions, an advanced argillic alteration assemblage forms, which is composed of silica, pyrophyllite, alunite and kaolinite/dickite, plus APS, among other minerals. The discovery of woodhouseite in the volcanic ash of the Ontake 2014 hydrothermal eruption represents the first reported presence of APS within an active volcano. Other volcanoes in Japan and elsewhere with similar phreatic eruptions ejecting altered ash fragments will likely contain APS minerals derived from magmatic-hydrothermal systems within the subvolcanic environment. The presence of APS minerals within the advanced argillic zone below the summit vent of Ontake volcano, together with the prior documentation of phyllic and potassically altered ash fragments, provides evidence for the existence within an active volcano in Japan of an alteration column comparable to that of porphyry copper systems globally.

scholarly journals Understanding fluid behavior through ion and isotope data from the Yitong Basin, Northeast China

2018 ◽  
Vol 55 (3) ◽  
pp. 308-320 ◽  
Author(s):  
Rongsheng Zhao ◽  
Xuanlong Shan ◽  
Jian Yi ◽  
Ye Liang ◽  
Chunlong Li ◽  
...  
Keyword(s):  
Northeast China ◽  
Thermal Water ◽  
Open Systems ◽  
Chemical Properties ◽  
Vertical Direction ◽  
Minor Element ◽  
Fluid Behavior ◽  
Magmatic Volatiles ◽  
C Value ◽  
Type Water

To evaluate ion origins and fluid behavior, the chemical properties of thermal water sampled from the Eocene reservoir in the Yitong Basin (YB), Northeast China, were investigated. The thermal water samples are classified as Na–HCO3-type water and were fully equilibrated, except for Sijixiangkang (SJXK) and Yitong (YT). The cations originate mainly from water–rock interactions (e.g., albitization and weathering of plagioclase), while the anions originate from magmatic volatiles and leaching of limestone and granite, which were heated by hot magmatic volatiles and exhibited an evaporation-like pattern in the Gibbs diagrams. The existence of magmatic volatiles was verified by the high ion ratio, the minor-element origins, δ13C values of HCO3, and δ34S values of SO4, which flowed upward along lithospheric faults, with higher fluxes in the northeast than in the southwest (the δ13C value of the Chaluhe depression (CD) is 0.93‰ lower than that of the Moliqing depression (MD, 1.63‰)). Furthermore, according to the Br/Cl and HCO3−/Cl ratios and the δ13C values, we speculate that a deep Permian limestone reservoir exists below the granitic unit. Based on the ion origins and fluid potentials, we conclude that the CD and MD are open systems rather than closed systems. The recharged water migrates from the margin to the center in the plane, and in the vertical direction, it migrates from the Yongji (E2y) and Sheling (E2sh) strata to the overlying strata and underlying Shuangyang (E2s) strata along faults. By summarizing all of the available data, we proposed a conceptual model of fluid migration.

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