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Soil Radon Flux in Hydrothermal Soil Radon Flux in Hydrothermal Area of the Tatun Volcano Group, Area of the Tatun Volcano Group,
N. Taiwan and its Monitoring ResultsN. Taiwan and its Monitoring Results
Tsanyao Frank YangTsanyao Frank Yang11, C.-C. Fu, C.-C. Fu11, H.Y. Wen, H.Y. Wen11, , W.L. HongW.L. Hong11, S.J. Lin, S.J. Lin22 and V. Walia and V. Walia22
1.Department of Geosciences, National Taiwan University2. National Center for Research on Earthquake Engineering,
NARL, Taiwan
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0
2
4
6
8
1 0
1 2
1 4
1 6
0 .1 0 .2 0 .3 0 .4 0 .5 0 .6 0 .7 0 .8 0 .9 1 .0 1 .1 1 .2 1 .3 1 .4 >2 .4
A ges (M a)
Freq
uenc
y
Fission trackAr-ArK -Ar
0 .1 0 .2 0 .3 0 .4 0 .5 0 .6 0 .7 0 .8 0 .9 1 .0 1 .1 1 .2 1 .3 1 .4 > 2 .41 .5
??
年 代 ( 百 萬 年 )
個數
頻率
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Soil CO2 Station in Italy
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Why CO2 & Rn ?? CO2 is, after water vapor, the most abundant gas phase
dissolved into magma. CO2 is one of the first gases to be exsolved and released
from an ascending magma. Increase in volcanic CO2 emission can be used as early
indicators of magma up-rise. Radon is trace gas and also sensitive to the magma
activity. Both CO2 and Radon sensors are commercially available
==> un-expensive and easy for continuously monitoring in corrosive environment !!
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METHODMETHODCO2 flux measurement
•Soil gas sampling for gas comp and isotopic analysis by MS.
In situ soil Rn analysis
CO2 flux measurement again
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Testing sites @ SYK
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S7 S1
0S8
S9
S2
S5S1
S6
S4
S3
Testing sites @ SYK
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Site 5
CO2 FLUX (ppm/sec)
T (℃) Radon
BEFORE
5.8 25.5 Balance value 6102.3 Bq/m3
AFTER 98 61 Temperature 32 ℃Humidity 85 %
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Site 6
CO2 FLUX (ppm/sec)
T (℃) Radon
BEFORE
3.8 3.1 Balance value 4064.1 Bq/m3
AFTER 207.3 91 Temperature 29 ℃Humidity 87 %
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Site 71426.7 Bq/m3
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Summary of survey results
location Rn (Bq/m3)CO2 flux
(ppm/sec)3He/4He (Ra)
CO2 conc(v %)
H2S+SO2 conc (v%)
Site 1 342 0.6 1.09 5.44 0.10
Site 2 3259 368 3.76 79.01 2.58
Site 3 498 0.5 1.03 5.59 0.14
Site 4 1284 24.5 4.56 85.78 1.67
Site 5 6102 98.0 3.64 78.45 8.25
Site 6 4064 207 4.65 80.68 5.23
Site 7 1427 2.1 1.04 1.58 0.16
Site 8 3339 3.8 4.71 85.81 0.22
Site 9 15846 2926 4.80 87.10 7.65
Site 10 90 0.4 1.17 0.22 0.20
Higher CO2 flux => higher radon flux => higher magma signals
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Configuration of Monitoring Station @SYKConfiguration of Monitoring Station @SYK
Equipped with: Rn & CO2 sensors which protected with plastic box and epoxy
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Station @SYK
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CO2 Result
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CO2 & Rn Result
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CONCLUSIONS The soil gases show significant magma signals (high
3He/4He ratios, CO2 flux, and total sulfurs) at SYK hydrothermal area.
The first monitoring station was successfully setup at SYK hydrothermal area in Taiwan. It is equipped with CO2 and Rn sensors, which are protected with plastic box and epoxy, and then can be used for long term monitoring under corrosive environments.
Both CO2 flux and radon concentrations show significant variations. They are correlated well with other magmatic proxy (3He/4He ratios and total sulfurs etc.) and can be used for further monitoring on the local magma activity.