Fumarolic Gas Composition of the Tatun Volcano Group,Northern Taiwan

Abstract

Giggenbach bottle technique is used to systematically analyze fumarolic gas composition of the Tatun Volcano Group, northern Taiwan. The area is quite active hydrothermally and is also considered volcanically active. The gas composition of fumarolic samples is predominantly steam water with CO 2 as the dominant component after de-watering. Minor components include sulfur species (mainly H S 2 and SO 2 ), N 2 and CH 4 . Interestingly, in the study area, H S 2 concentration is always much higher than SO 2 for all measured fumarolic gases. This result resembles the typical composition of low temperature fumaroles, when comparisons are made on a worldwide basis.