Fluid Inclusion Microthermometry and Implications for the Mechanisms of Ore-Grade Gold Mineralization in Epithermal System, Lalab Orebody, Sibutad, Zamboanga del Norte, Philippines

Autor: Victor B. Maglambayan, Graciano P. Yumul, F. A. Jimenez
Rok vydání: 2007
Předmět:
Zdroj: Resource Geology. 57:170-179
ISSN: 1751-3928
1344-1698
DOI: 10.1111/j.1751-3928.2007.00015.x
Popis: The Sibutad gold deposit has gold associated in quartz veins. The most important of these is the Lalab orebody, which contains ore-grade gold, predominantly, in milky quartz veins and veinlets. Here, alteration quartz and fine-grained crystalline clear and milky quartz were formed from hydrothermal fluids in three stages, namely stages I, II and III. Fluid inclusion microthermometry was carried out on stage I milky quartz, stage II fine-grained alteration quartz and stage III milky quartz ± barite veins and veinlets. Homogenization temperatures (TH) are >248°C in stage I, 214–232°C in stage II and 186–239°C in stage III. These fluid inclusions have salinity between 1 and 2 wt% NaCl equivalent. In terms of gold assay, stage I drill-core samples have gold grades 0.53–0.76 g/ton Au, stage II samples have 1.12–3.70 g/ton Au and stage III samples have 9.06–23.88 g/ton Au. This correlation suggests that gold was precipitated from the stage II and III fluids.
Databáze: OpenAIRE
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