NDLI: Interaction of fluids and rocks at the magmatic-hydrothermal interface of the Mt Cagua geothermal system, Northeastern Luzon Island, the Philippines

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Interaction of fluids and rocks at the magmatic-hydrothermal interface of the Mt Cagua geothermal system, Northeastern Luzon Island, the Philippines

Content Provider	Scilit
Author	Reyes, Agnes G.
Copyright Year	2021
Description	The Mt Cagua hydrothermal system is centered on a young volcano which last erupted in 1860. Even prior to drilling, surface features indicated active magmatic input at depth, such as acid SO4-Cl hot springs at high elevation, enriched in both 18O and D with respect to local groundwater, and fumaroles discharging gases suggesting a highly oxidizing, immature source. The proportion of “andesitic” or arc-type magmatic water in the steam discharge is ≈65%. The drilling of a directional well, deviated towards the crater, showed that the magmatic-hydrothermal interface, where temperatures are >400°C, is confined to a small volume. Fluid inclusion and alteration minerals indicate that it is occupied largely by vapor and is connected to surface fumaroles via a vapor conduit. Magmatic volatiles released into the system rapidly partition into a brine and a gas-rich vapor. When released into water-logged microfractures, short-lived acid sulfate waters form and precipitate a corresponding alteration assemblage. The inferred magmatic fluid at Cagua, based on fluid inclusions, has a Cl content of 15 000 to 30 000 mg/kg, a CO2 content of 4 molal and high H2S. Through dilution and boiling this fluid forms the waters of the groundwater-dominated hydrothermal envelope adjacent to the magmatic-hydrothermal interface. Book Name: Water-Rock Interaction
Related Links	https://api.taylorfrancis.com/content/chapters/edit/download?identifierName=doi&identifierValue=10.1201/9780203734049-132&type=chapterpdf
Ending Page	541
Page Count	5
Starting Page	537
DOI	10.1201/9780203734049-132
Language	English
Publisher	Informa UK Limited
Publisher Date	2021-07-09
Access Restriction	Open
Subject Keyword	Book Name: Water-rock Interaction Discharging Groundwater Magmatic Hydrothermal Interface
Content Type	Text
Resource Type	Chapter

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