ACADSTAFF UGM
| Title | : | The geology and geothermal systems of the Minahasa District, North Sulawesi |
| Author | : |
MUHAMMAD SIDQI (1) Ir. Pri Utami, M.Sc.,Ph.D., IPM. (2) |
| Date | : | 0 2018 |
| Keyword | : | Minahasa district,North Sulawesi,geology,geothermal system Minahasa district,North Sulawesi,geology,geothermal system |
| Abstract | : | The Minahasa district is situated in a volcanic field of the north arm of Sulawesi comprising parts of the Sangihe volcanic arc, at the elevation range of from 687 m asl (Lake Tondano) to 1784 m asl (the summit of Mt. Soputan). The district has geothermal potential hosted by different types of system. The economically developed geothermal potential for power generation is located in the Tompaso Field, and managed by PT. Pertamina Geothermal Energy (PGE). This paper present the results of our work to better understand the geological framework of the Minahasa district and to investigate the occurrence of different types of geothermal system and their association with volcanic phenomena. In general, the history of volcanism in Minahasa district - known from our field geological mapping and other relevant information - started since the volcanic activity of Mt. Kawatak, followed by the volcanic eruptions of Tondano, and later by eruptions forming many volcanic cones (e.g. Rindengan, Lengkoan, Wawona, Wowok, Matatumbak, Pinasuan, Luuk, Kanonang, etc.), Sempu volcanic dome, and Mt. Soputan that is still active. Consequently, geothermal systems with different degrees of “maturity” may occur in the Minahasa district. The low-relief terrain within the remnant of the Tondano Caldera is occupied by a hydrothermal system characterized by the discharge of boiling and near-boiling neutral-pH chloride hot springs and hotpools in Tempang, Toraget, and Karumenga villages. The inferred volcanic-hydrothermal type system manifests in the form of solfataras with significant sulfur deposition, and steam-heated, acidic hot springs in Kanonang village (Bukit Kasih). It occurs in the high-relief terrain of the Rindengan volcanic complex. Effusive and explosive activities of Mt. Soputan show the existence of a hazardous, magmatic-geothermal system. The result of this study shall be followed up by more detailed work to quantitatively constrain the timing of volcanism and hydrothermal activities. When combined with the results of detailed analysis of the subsurface geoscientific data from the Tompaso geothermal field it will be an important knowledge to support the construction of the development strategy of the geothermal potential in Minahasa. |
| Group of Knowledge | : | |
| Level | : | Nasional |
| Status | : |
Published
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| No | Title | Action |
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| 1 |
PU_IIGCE2018-MS-PU.pdf
Document Type : [PAK] Full Dokumen
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