NDLI: Stable (H, O, C) and noble-gas (He and Ar) isotopic compositions from calcite and fluorite in the Speewah Dome, Kimberley Region, Western Australia: implications for the conditions of crystallization and evidence for the influence of crustal-mantle fluid mixing

Content Provider	Springer Nature Link
Author	Czuppon, Gy Ramsay, R. R. Özgenc, I. Demény, A. Gwalani, L. G. Rogers, K. Eves, A. Papp, L. Palcsu, L. Berkesi, M. Downes, P. J.
Copyright Year	2014
Abstract	In this study, the C-O-isotopic data from calcite at Yungul and Wilmott (Speewah. Western-Australia) are integrated with microthermometry, H2O-, CO2-content and H-He-Ar-isotopic data from fluid inclusions in genetically related calcite and fluorite to map the origin and crystallization paths of the fluids. In addition to the hydrogen isotopic compositions of fluid inclusions in fluorite, oxygen isotopic compositions were also determined by cavity ring-down spectroscopy. The geochemical data suggest mixing of a CO2-dominated mantle fluid and a H2O-domintated crustal brine. The fluid produced by this mixing is characterized by radiogenic (crustal-like) 3He/4He ratios, crustal-like δD values, relatively high salinity (19 − 24wt.% NaCl eq.), moderate homogenization temperatures (150 − 450 °C) and mantle-like CO2/3He ratios. Moreover, the large isotopic and elemental variations found in calcite indicate that its formation was accompanied by an extensive degassing (open system) leading to a decrease in δD and an increase in the CO2/3He values relative to the starting fluid composition. This degassing is consistent with the fluidal- and breccia-like texture of calcite observed in the field. In contrast, the fluorite which has coarse-grained banded to vughy textures formed in a passive aqueous system. Apparently the fluid that formed the fluorite has the same origin as the calcite, but the higher water content and the more radiogenic 3He/4He ratios reflect a greater involvement of crustal fluids. The historical description of the calcite-fluorite system in the Speewah area as “carbonatite” is now considered inappropriate because there is no evidence that crystallization is dominated by magmatic processes.
Starting Page	759
Ending Page	775
Page Count	17
File Format	PDF
ISSN	09300708
Journal	Mineralogy and Petrology
Volume Number	108
Issue Number	6
e-ISSN	14381168
Language	English
Publisher	Springer Vienna
Publisher Date	2014-06-13
Publisher Place	Vienna
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Mineralogy Inorganic Chemistry Geochemistry
Content Type	Text
Resource Type	Article
Subject	Geophysics Geochemistry and Petrology

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