台灣地區弧陸碰撞前緣泥火山噴氣成份與成因研究（I）
Other Title
Geochemical surveillance of fumaroles and bubble gases for
the potential magma activity in N. Taiwan (I)
the potential magma activity in N. Taiwan (I)
Date Issued
2002
Date
2002
Author(s)
楊燦堯
DOI
902116M002031
Abstract
Representative samples of natural gases,
including mud volcano and gas well sources,
were collected for analysis of gas
composition. Overall, the helium isotopic
ratios of the natural gases are proportional to
the CO2 contents. Those samples with
higher CO2 contents usually exhibit higher 3 He/4 He ratios. For example, the samples
collected from deep gas wells usually contain
a slight amount of CO2 (up to 42%) and
exhibit higher helium isotopic ratios
(0.51~2.99Ra) than those from “normal”
natural gases at the surface. Hence, at least
two components can be identified in natural
gases in Taiwan. One is the crustal
component, which is methane dominated
with very low 3 He/4 He ratios (0.02 Ra); the
other is a mantle-derived component with
higher 3 He/4 He ratios and enriched in CO2.
The composition of most natural gases in
Taiwan can be well explained by different
proportions of the above two components.
However, the other component which
dominated with CH4 and high 3 He/4 He ratios
is necessary to account for Chung-lun mud
pool and Pa-Chiang-Chi gas well samples.
Subjects
Natural gases
mud volcanoes
hot springs
mantle source
Publisher
臺北市：國立臺灣大學地質科學系暨研究所
Type
report
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