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1 2023

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Geodynamics of Sibumasu Block in Southern Thailand: Interpretation from Heat Flow Map

Kongpet Panupong, Kanjanapayont Pitsanupong

Geotourism / Geoturystyka

2023

nr 1-2 (72-73)

37--37

Southern Thailand, located on the thick and stable Sibumasu continental block, is known for its high heat flow despite lacking volcanic activity (Sautter et al., 2017). This study employs the Curie Point Depth (CPD) calculation, an indirect method, to evaluate land heat flow (e.g., Hsieh et al., 2014; Li et al., 2017; Qudsi, 2019). By analyzing airborne magnetic data and utilizing spectral analysis, the study generates CPD, thermal gradient, and heat flow maps for southern Thailand (e.g., Carrillo-de la Cruz et al., 2020; Núñez Demarco et al., 2021). The findings reveal heat flow values ranging from 61.54 mW/m² to 154.25 mW/m², with an average of 90.36 mW/m², surpassing the typical heat flow of 65 mW/m² for continental crust (Turcotte & Schubert, 2002). The study identifies five distinct zones characterized by higher heat flow compared to the surrounding areas: the Ranong fault zone (RF), Khlong Marui fault zone (KMF), coastline of Surat Thani and Nakhon Si Thammarat, Trang and Satun zone, and the Bentong-Roab suture (BRS). The RF and KMF represent active strike-slip faults that penetrate the continental crust into the upper mantle (Kanjanapayont et al., 2012; Sautter et al., 2017), while the BRS denotes a weak zone marking the suture between Sibumasu and Indochina terranes (Metcalfe, 2000), potentially extending into the mantle. The elevated heat flow observed along the coastline of Surat Thani and Nakhon Si Thammarat, as well as in the Trang and Satun zone, may be influenced by burial faults or fractures. Interpretation with P-wave tomography suggests a possible high heat mantle anomaly under southern Thailand (Huang et al., 2015). These initial findings suggest that the high heat flow in the thick and stable continental crust of Sibumasu originates from mantle upwelling caused by surrounding subducted plates under Eurasia. These heat sources manifest through weak zones in extensional regimes such as the RF, KMF, and possible undefined burial faults or fractures, as well as the BRS. The study provides preliminary understanding of present-day geodynamics of the Sibumasu block and its potential implications for mineral resources, petroleum exploration, geothermal energy, and carbon capture and storage.