Curie Point Depth Analysis of Lesugolo Area, East Nusa Tenggara, Indonesia Based on Ground Magnetic Data

Journal of Engineering and Technological Sciences

Bakrun Bakrun¹  Dini Andriani²  Eleonora Agustine³  R. B. Astro⁴  Wahyu Srigutomo⁵  Umar Said⁵  I G. P. F. Soerya Djaja⁵  Alamta Singarimbun⁵  Pepen Supendi⁶ 

[1] Center for Mineral, Coal and Geothermal Resources, Geological Agency,Ministry of Energy and Mineral Resources of Indonesia,Jalan Soekarno-Hatta 444 Bandung 40254 Indonesia;Department of Nautica, Cirebon Maritime Academy, Jalan Dukuh Semar 1,Kecapi, Harjamukti, Cirebon 45142, Indonesia;Geophysics, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Jalan Raya Bandung – Sumedang Km 21, Jatinangor, Sumedang 46353, Indonesia;Physics Education, Faculty of Teacher Training and Education, University of Flores, Jalan Sam Ratulangi, Paupire, Ende Tengah, Ende,East Nusa Tenggara 86316, Indonesia;Physics of Earth and Complex Systems, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesa 10 Bandung 40132, Indonesia;eophysical Engineering, Faculty of Mining and Petroleum Engineering,Institut Teknologi Bandung, Jalan Ganesa 10 Bandung 40132, Indonesia;

关键词: Curiepointdepth;    FloresIsland;    geothermalsystemofLesugolo;    ground magnetic data;    spectral analysis;   

DOI  :  10.5614/j.eng.technol.sci.2022.54.1.11

来源: DOAJ

【 摘 要 】

The Curie point depth, or magnetic basal depth, of the Lesugolo geothermal area in Ende, Flores Island, East Nusa Tenggara, Indonesia was estimated by performing spectral analysis on spatial magnetic data and transforming it into the frequency domain, resulting in a link between the 2D spectrum of magnetic anomalies and the depths of the top and centroid of the magnetic sources. Shallow Curie point depths of 16 to 18 km were found in the north-northeast to southeast areas of Lesugolo, while deeper depths of 24 to 26 km were found in the southwest. The tectonic setting beneath the central part of Flores Island governs the distribution of the Curie point depths in the area. Shallow Curie point depth zones are associated with high thermal gradients (30 to 34 °C/km) and heat flow (80 to 100 mW/m2). Deep depths, on the other hand, correspond to zones of low thermal gradient (21 to 26 °C/km) and low heat flow (65 to 80 mW/m2). Both the derived thermal gradient and the heat flow maps contribute to a better understanding of the Lesugolo geothermal system’s configuration. This study suggests that the Lesugolo geothermal area’s prospect zone is located in the center of the investigated area, where the Lesugolo normal fault forms its southeastern boundary.

【 授权许可】

Unknown