GEOLOGICAL STRUCTURE IDENTIFICATION OF NON VULKANIC HOT SPRINGS USING WENNER GEOLECTRICAL CONFIGURATION, NYELANDING VILLAGE, SOUTH BANGKA

Abstract

Nyelanding Non-vulcanic geothermal is located in Air Gegas Subdistrict, South Bangka
Regency,   Bangka   Belitung   Province.   The   research   area   is   in 106 16’23.0”-

106 16’19.5”E and 2 42’02.3” - 2 42’00.7”S. Geothermal manifestation is some water
pools with 46 C thermal average and 6.42 pH. Geoelectricity with Wenner Configuration
reveals subsurface condition with high resistivity (45-1046 m). Resistivity section in
line 3 describes the presence of granite rocks with 1046    m at 2 - 2.5 m depth.
Subsurface structures at 1 - 2 m depth are dominated by sandstone (100 - 300    m).
High  resistivity  data  indicates  the  geology  structures  are  not  related  to vulcanic
geothermal rocks which usually shows low resistivity rocks. Thermal source comes from
jointed granite rock which contains Th (45.3 ppm), U(184.7 ppm), Ti (0.439%) and
Y(123.1 ppm), whereas cap rocks are sandstone and aluvium sediment.