TY - JOUR
T1 - Supercritical geothermal reservoir revealed by a granite–porphyry system
AU - Tsuchiya, Noriyoshi
AU - Yamada, Ryoichi
AU - Uno, Masaoki
N1 - Funding Information:
This work was supported by a Grant-in-Aid for Specially Promoted Research , Grant Number 25000009 . Our study benefited from discussions with Prof. Mark Reed (University of Oregon, USA), and research members of JBBP (Japan Beyond Brittle Project). The authors would like to say thanks to anonymous reviewers and guest editor (Dr. Patrick Dobson) for variable comments to revise the manuscript.
Publisher Copyright:
© 2016
PY - 2016/9
Y1 - 2016/9
N2 - To understand the geological properties of a supercritical geothermal reservoir, we investigated a granite–porphyry system as a natural analog. Quartz veins, hydrothermal breccia veins, and glassy veins are present in Neogene granitoids in NE Japan. The glassy veins formed at 500–550 °C under lithostatic pressures, and then pressures dropped drastically. The solubility of silica also dropped, resulting in formation of quartz veins under a hydrostatic pressure regime. Connections between the lithostatic and hydrostatic pressure regimes were key to the formation of the hydrothermal breccia veins, and the granite–porphyry system provides useful information for creation of fracture clouds in supercritical geothermal reservoirs.
AB - To understand the geological properties of a supercritical geothermal reservoir, we investigated a granite–porphyry system as a natural analog. Quartz veins, hydrothermal breccia veins, and glassy veins are present in Neogene granitoids in NE Japan. The glassy veins formed at 500–550 °C under lithostatic pressures, and then pressures dropped drastically. The solubility of silica also dropped, resulting in formation of quartz veins under a hydrostatic pressure regime. Connections between the lithostatic and hydrostatic pressure regimes were key to the formation of the hydrothermal breccia veins, and the granite–porphyry system provides useful information for creation of fracture clouds in supercritical geothermal reservoirs.
KW - Geofluids
KW - Granite–porphyry system
KW - Mineral filling veins
KW - Porphyry copper mineralization
KW - Supercritical geothermal reservoir
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U2 - 10.1016/j.geothermics.2015.12.011
DO - 10.1016/j.geothermics.2015.12.011
M3 - Article
AN - SCOPUS:84967317293
VL - 63
SP - 182
EP - 194
JO - Geothermics
JF - Geothermics
SN - 0375-6505
ER -
