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Geochemical Characteristics of Gases from the Wudalianchi Volcanic Area, Northeastern China
Author(s) -
Jianguo DU,
Shengqiang LI,
Yi ZHAO,
Jinzhang REN,
Rubo SUN,
Heshun DUANMU
Publication year - 1999
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/j.1755-6724.1999.tb00830.x
Subject(s) - volcano , carbon dioxide , isotopes of carbon , methane , geology , δ13c , crust , helium , geochemistry , mantle (geology) , stable isotope ratio , isotope , aquifer , mineralogy , environmental chemistry , groundwater , total organic carbon , chemistry , physics , organic chemistry , quantum mechanics , geotechnical engineering
The origins of gases in springs, pools and wells from the Wudalianchi (WDLC) volcanic area are discussed based upon molecular and isotope compositions of the gases. Nine gas and water samples were collected from bubbles and water of the springs and pools in the WDLC volcanic area, Northeastern China, in August 1997. The molecular components were measured with a MAT‐271 mass spectrometer (MS), helium isotope ratios with a VG‐5400 MS, and δ 13 C with a MAT‐251 MS in the Lanzhou Institute of Geology. The gases are enriched in CO 2 , and most of the CO 2 concentrations are over 80% (V). The helium and methane concentrations have relatively wide ranges of 0.7 to 380×10 −6 and 4 to 180×10 −6 , respectively. The 3 He/ 4 He ratios are between 1.05 Ra and 3.1 Ra (Ra = 1.4×10 −6 ); the 4 He/ 20 Ne values are between 0.45 and 1011, larger than the atmospheric value (0.32). The δ 13 C (PDB) values of carbon dioxide range from −9.6 to −4.2%%. These geochemical data demonstrate that the spring water is from aquifers at different depths, and that helium and carbon dioxide are derived from the mantle, and are contaminated by crust gases during deep fluid migration. Also, there are larger fluxes of deep‐earth matter and energy in the WDLC volcanic area.