Calibration of high-temperature furnace assemblies for experiments between 200 and 600 MPa with end-loaded piston-cylinder apparatuses

Date

2019-04-15

Authors

Farias Vlach, Silvio Roberto
Salazar-Naranjo, Andrés Fabián
Torres-Corredor, Johan Santiago
de Carvalho, Paulo Rafael
Mallmann, Guilherme

Journal Title

Journal ISSN

Volume Title

Publisher

Sociedade Brasileira de Geologia

Abstract

We present pressure calibration results for piston-cylinder –” and 1” high temperature furnace assemblies in the 200-600 MPa range aiming to expand its applicability to simulate upper crustal conditions. The furnace assemblies were made up by crushable MgO, graphite heater, pyrex glass spacer, and NaCl sleeve. Twenty-one experiments were carried out over a range of pressures (200-600 MPa) and temperatures (870-945°C) to determine the liquidus curve of NaCl. The obtained curve slope fits that given by Siewert et al. (1998), but offsets by ~ -55 MPa, implying the need of a constant P upward correction in the 300-600 MPa and ca. 300-400 MPa pressure ranges for the 3/4” and 1” assemblies, respectively. However, if the NaCl melting points (918-920°C) obtained by Bohlen (1984) at 500 MPa are used as reference, no pressure correction is needed. Larger offsets (to -120 MPa) were obtained under pressure conditions around and lower than 300 MPa with the 1” assembly. Our results confirm the applicability of Bristol-type end-loaded piston-cylinders coupled with appropriate furnace assemblies in assessing relatively low-pressure conditions (down to ~ 200 MPa, ~ 7 km depth) found in the Earth’s upper crust, where important magmatic, hydrothermal and metamorphic processes occur.

Description

Keywords

End-loaded piston-cylinder apparatus, NaCl melting method, low-pressure calibration, experimental petrology and geochemistry

Citation

Source

Brazilian Journal of Geology

Type

Journal article

Book Title

Entity type

Access Statement

Open Access

License Rights

Attribution 4.0 International (CC BY 4.0) License

DOI

10.1590/2317-488920192018090

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