Fluid inclusions in sphalerite at Laisvall, Sweden
作者:
Sten Lindblom,
DavidT. Rickard,
期刊:
Geologiska Föreningen i Stockholm Förhandlingar
(Taylor Available online 1978)
卷期:
Volume 100,
issue 2
页码: 177-180
ISSN:0016-786X
年代: 1978
DOI:10.1080/11035897809454457
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Sphalerite from the upper sandstone ore of the Laisvall sandstone lead–zinc deposit contains two-phase, primary, pseudosecondary and secondary inclusions. The inclusions homogenize at a modal value of 155°C and melt at −22°C. The secondary inclusions, which include necked-down types, tend to homogenize at +200°C and melt at −27°C. A fourth type of inclusion has been observed which contains a single dark phase, probably hydrocarbons. The melting temperatures of the primary inclusions indicate a strong Na-Cl brine with 24 equivalent wt.-% NaCl. The freezing temperatures of −60 to −90°C indicate that the trapped fluid contained calcium. These preliminary fluid-inclusion data suggest that the Laisvall sphalerite was precipitated at around 155°C from a concentrated Na-Ca-Cl brine.
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