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The role of magmatic and hydrothermal processes in the evolution of Be-bearing pegmatites : Evidence from beryl and its breakdown products (CROSBI ID 195590)

Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija

Strmić Palinkaš, Sabina ; Wegner, Reinhard ; Čobić, Andrea ; Palinkaš, Ladislav ; De Brito Barreto, Sandra ; Váczi, Tamás ; Bermanec, Vladimir The role of magmatic and hydrothermal processes in the evolution of Be-bearing pegmatites : Evidence from beryl and its breakdown products // American mineralogist, 99 (2014), 2/3; 424-432. doi: 10.2138/am.2014.4500

Podaci o odgovornosti

Strmić Palinkaš, Sabina ; Wegner, Reinhard ; Čobić, Andrea ; Palinkaš, Ladislav ; De Brito Barreto, Sandra ; Váczi, Tamás ; Bermanec, Vladimir

engleski

The role of magmatic and hydrothermal processes in the evolution of Be-bearing pegmatites : Evidence from beryl and its breakdown products

Beryl and euclase crystals from the Mina do Santino and the Jacú pegmatites in the Borborema Pegmatite Province in northeastern Brazil contain several generations of melt and fluid inclusions, which allow interpretation of P-T-X conditions responsible for beryl crystallization and for alteration of a primary pegmatitic mineral assemblage to a mixture of hydrothermal minerals (euclase, bertrandite, kaolinite and quartz). Primary melt and fluid inclusions hosted by beryl were trapped simultaneously. However, their homogenization temperatures are significantly higher (870-900 {; ; ; degree sign}; ; ; C) than the values previously reported for pegmatitic systems (<712{; ; ; degree sign}; ; ; C) and should to be treat with caution. An isobaric drop of temperature resulted in the exsolution of a fluid. A low-salinity CO2-enriched phase and a saline water-rich phase were trapped in pseudosecondary inclusions in beryl at a pressure of 2.1-2.7 kbar and temperature of 390-480 {; ; ; degree sign}; ; ; C. Cooling of the country rocks below 400 {; ; ; degree sign}; ; ; C caused a ductile-to-brittle transition and allowed infiltration of cold groundwater, which further decreased the temperature in the system to 190-240 {; ; ; degree sign}; ; ; C. At the same time, the pressure dropped from a lithostatic (2.1-2.7 kbar) to a hydrostatic value (0.57-0.73 kbar). Consequently, minerals deposited under magmatic conditions (feldspars and beryl) became unstable and a newly-formed hydrothermal mineral paragenesis (euclase, bertrandite, kaolinite and quartz) overprinted the earlier one. The hydrothermal fluids responsible for the alteration differ from the earlier-exsolved fluids in having a lower salinity, lower homogenization temperature, the absence of CO2 and the presence of CH4.

beryl; euclase; bertrandite; kaolinite; quartz; hydrothermal alterations; fluid and melt inclusions; Mina do Santino and Jacú pegmatite

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Podaci o izdanju

99 (2/3)

2014.

424-432

objavljeno

0003-004X

10.2138/am.2014.4500

Povezanost rada

Geologija

Poveznice
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