scholarly journals Geochronological and geochemical constraints on the heat source of thermal activity in the Rausu geothermal field, Shiretoko Peninsula, Hokkaido, Japan.

2002 ◽  
Vol 97 (3) ◽  
pp. 79-84 ◽  
Author(s):  
Yoshihiko GOTO ◽  
Tatsuzo KONO ◽  
Nobutaka TSUCHIYA
Keyword(s):  
Heat Source ◽  
Geothermal Field ◽  
Thermal Activity ◽  
Geochemical Constraints

scholarly journals Hydrogeochemical Characteristics and Genesis of Geothermal Water from the Ganzi Geothermal Field, Eastern Tibetan Plateau

Water ◽  
2019 ◽  
Vol 11 (8) ◽  
pp. 1631
Author(s):  
Fan ◽  
Pang ◽  
Liao ◽  
Tian ◽  
Hao ◽  
...  
Keyword(s):  
High Temperature ◽  
Tibetan Plateau ◽  
Heat Source ◽  
Chloride Concentration ◽  
Geothermal Field ◽  
Geothermal Water ◽  
Helium Isotope ◽  
Geothermal System ◽  
The Tibetan Plateau ◽  
Geothermal Waters

The Ganzi geothermal field, located in the eastern sector of the Himalayan geothermal belt, is full of high-temperature surface manifestations. However, the geothermal potential has not been assessed so far. The hydrochemical and gas isotopic characteristics have been investigated in this study to determine the geochemical processes involved in the formation of the geothermal water. On the basis of δ18O and δD values, the geothermal waters originate from snow and glacier melt water. The water chemistry type is dominated by HCO3-Na, which is mainly derived from water-CO2-silicate interactions, as also indicated by the 87Sr/86Sr ratios (0.714098–0.716888). Based on Cl-enthalpy mixing model, the chloride concentration of the deep geothermal fluid is 37 mg/L, which is lower than that of the existing magmatic heat source area. The estimated reservoir temperature ranges from 180–210 °C. Carbon isotope data demonstrate that the CO2 mainly originates from marine limestone metamorphism, with a fraction of 74–86%. The helium isotope ratio is 0.17–0.39 Ra, indicating that the He mainly comes from atmospheric and crustal sources, and no more than 5% comes from a mantle source. According to this evidence, we propose that there is no magmatic heat source below the Ganzi geothermal field, making it a distinctive type of high-temperature geothermal system on the Tibetan Plateau.

A microearthquake survey at the Ngawha geothermal field, New Zealand

Geophysics ◽  
1981 ◽  
Vol 46 (10) ◽  
pp. 1467-1468 ◽  
Author(s):  
Russell Robinson
Keyword(s):  
New Zealand ◽  
Hot Springs ◽  
Geothermal Field ◽  
Hot Water ◽  
Taupo Volcanic Zone ◽  
Thermal Activity ◽  
Volcanic Zone ◽  
Depth Level ◽  
Geothermal Exploration ◽  
The North

A twenty day microearthquake survey of the Ngawha geothermal field, New Zealand, was undertaken in order to establish the level of preproduction seismicity and to test the usefulness of such surveys in geothermal exploration. The Ngawha geothermal field, in the far northwest of the North Island (Northland) is associated with a region of Quaternary basaltic volcanism. It is not a part of the much more extensive Taupo volcanic zone in the central North Island, site of the well‐known Wairakei geothermal field, among others. Although surface thermal activity at Ngawha is limited to a few relatively small hot springs, resistivity surveys have outlined a [Formula: see text] area of hot water at the 1-km depth level (Macdonald et al. , 1977). Test bores to that depth have encountered temperatures of up to 250 °C within Mesozoic graywacke. Overlying the graywacke is about 500 m of Cenozoic claystone and siltstone which forms an impermeable cap.

Heat source for Tongonan Geothermal Field

Island Arc ◽  
2000 ◽  
Vol 9 (4) ◽  
pp. 513-526 ◽  
Author(s):  
Graeme L. Scott
Keyword(s):  
Heat Source ◽  
Geothermal Field

Heat source for Tongonan Geothermal Field

Island Arc ◽  
2008 ◽  
Vol 9 (4) ◽  
pp. 513-526
Author(s):  
Graeme L. Scott
Keyword(s):  
Heat Source ◽  
Geothermal Field

scholarly journals A comparison of regularized, sharp boundary and tear zone inversions along an MT profile in Sabalan geothermal field, Iran

2020 ◽  
Vol 211 ◽  
pp. 02004
Author(s):  
Mansoure Montahaei ◽  
Saeid Ghanbarifar
Keyword(s):  
Heat Source ◽  
Geothermal Field ◽  
Hydrothermal Systems ◽  
Geothermal System ◽  
Sharp Boundary ◽  
Hypothesis Tests ◽  
Inversion Result ◽  
Inversion Model ◽  
Clay Cap ◽  
Geothermal Region

This paper investigates magnetotelluric (MT) data recorded along a profile in the Sabalan geothermal region, NW of Iran. To find the range of relevant models consistent with the data, this study employed the so-called regularized, tear zone, and sharp boundary inversions. This study could effectively derive three alternative classes of models. Although the models show stable common resistive and conductive features there are some inconsistent details. Unaltered surface rocks and porous Basalt exhibit a high resistive overburden underlain by relatively more conductive Paleozoic sediments. A common signature of hydrothermal systems appears, and resistivities increase beneath a highly conductive clay cap in deeper parts. An intriguing feature resolved in the smoothest inversion model is a second deep conductor of 30 Ωm resistivities at a depth of 3 km, extending close to the surface. It can be related to the hot, solidified volcanic intrusions, resemblingthe heat source in a geothermal system. This study applied the two other inversion approaches for further hypothesis tests. Although the tear zone inversion re-establish the deep conductor (with 38 Ωm resistivities at 3 km depth), it is absent in the sharp boundary inversion result. This study concludes that the second deep conductor has a limited structure resolution.

scholarly journals Integrated Geoscience Data to Identify Heat Source Beneath Umeh Volcanic Complex in Tompaso Geothermal Field

2021 ◽  
Vol 732 (1) ◽  
pp. 012008
Author(s):  
Sigit Suryanto ◽  
R.M. Tofan Sastranegara ◽  
Antonius Rishang Untoro ◽  
Nanda Najih H. Affif ◽  
Ristio Effendi ◽  
...  
Keyword(s):  
Heat Source ◽  
Geothermal Field ◽  
Volcanic Complex
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