Gas Compositions and Hydrochemistry of Thermal Springs in Peninsular Malaysia
Date Issued
2015
Date
2015
Author(s)
Lim, Wuh-Terng
Abstract
Peninsular Malaysia is located on Sunda Plate which is situated between two major boundaries of tectonic plates, the Australian Plate and the Eurasian Plate. Over sixty thermal springs had been reported in Peninsular Malaysia, a non-volcanic country. In this study, eighteen spring samples have been analysed, from which the piper plot and meteoric water line is constructed. Moreover, helium isotopic analyses, dissolved gas analyses and radon activity analyses are also carried out in order to investigate the origin and sources of thermal springs in Peninsular Malaysia. The surface temperature of selected thermal springs ranges from 40.1°C to 88.7°C, the pH values range from 6.6 to 9.1, and the conductivity varies between 200 µs/cm and 43000 µs/cm. The radon activity analyses had been carried out by using RAD7 Radon Detector. Result shows that the radon value of selected thermal springs in Peninsular Malaysia fluctuates within highest value of 111,866 Bq/cm3 and lowest value of 200 Bq/cm3. As for the dissolved gas in thermal springs, nitrogen is the major component and argon, carbon dioxide and oxygen are minor constituents. Isotopic composition of hydrogen (D/H) and oxygen (18O/16O) mostly fall along the local meteoric water line, indicating that the meteoric water is the major fluid source for thermal springs. Meanwhile, the helium isotopic ratios of most samples (except HS 12) show consistently low values, less than 0.1 Ra (Ra is the 3He/4He ratio of the air). It implies that crust component is the major helium gas source for thermal springs, except sample of HS 12 which may involve upper mantle component.
Subjects
Peninsular Malaysia
Thermal springs
Dissolved gas composition
Water radon
Isotopic composition
Type
thesis
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