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利用氫、氧及鍶同位素系統瞭解臺灣泥火山流體的來源與遷移

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Research Express@NCKU - Articles Digest

1 of 1

Research Express@NCKU Volume 24 Issue 9 - September 13, 2013 [ http://research.ncku.edu.tw/re/articles/e/20130913/3.html ]

The origin and migration of mud volcano fluids in

Taiwan: Evidence from hydrogen, oxygen, and

strontium isotopic compositions

Hung-Chun Chao, Chen-Feng You

*

, Hou-Chun Liu, Chuan-Hsiung Chung

Department of Earch Sciences, NCKU cfy20@mail.ncku.edu.tw

Geochimica et Cosmochimica Acta, Volume 114, 1 August 2013, Pages 29–51

W

e have measured hydrogen, oxygen, and strontium isotopic compositions (87Sr/86Sr、δ88Sr) in mud volcano fluids to decipher the origin(s), migration pathways, and possible retrograde interactions during fluid ascent. The results of hydrogen, oxygen isotopes, and major elements indicate the fluids are from the depth where strong water-rock interaction has occurred as well as clay dehydration. Radiogenic Sr isotopes (87Sr/86Sr) are robust indicators of fluid source(s) and it is a better tool to distinguish multiple deep reservoirs. Extremely high stable Sr isotope ratios (δ88Sr)) were detected

from mud volcanoes located on Chiayi area (up to 0.82‰). In general concept, the natural variation of stable Sr isotopes are small (<0.3‰). This highest reported value of stable Sr isotopes in natural samples is caused by carbonate precipitation during fluid migration based on our laboratory experiment.

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