Acta Geologica Sinica, (2013)
helium, argon and carbon isotopic compositions of spring
gases in the hainan island, china
S Morad, JM Ketzer, LF De Ros
Abstract
Chemical and isotopic compositions have been measured for N2-He-rich bubbling
gases discharging from hot springs in the Hainan Island, Southern China. Observed
3He/4He ratios (0.1–1.3 RA) indicate the occurrence of a mantle component throughout the
island, which has been highly diluted by a crustal radiogenic 4He component. The
occurrence of mantle-derived helium is high in the northern island (12%–16% of total He)
and gradually decreases towards southern coast (l%–3% of total He). Such a distribution ...