@article{oai:ir.kagoshima-u.ac.jp:00011132,
 author = {Nedachi, Munetomo and 根建, 心具 and Inoue, Akio and 井上, 晃男 and Taguchi, Sachihiro and 田口, 幸洋},
 issue = {1},
 journal = {南太平洋研究, South Pacific Study},
 month = {Nov},
 note = {Geochemistry of the hot spring, meteoric and sea waters in the Wewak region, East Sepik Province, Papua New Guinea, was preliminarily described. δ D and δ <18>^O of the groundwater in this region are -41.1‰ and -6.5‰, respectively. The river water is much lighter. They are well on the meteoric
water line (CRAIG, 1961). δ D of the hot spring water in Kairiru Island is -20.0‰, and the Cl- content is 9630 mg/l. The data suggest that the hot spring water originated from the 1:1 mixture of the meteoric water and sea water in this region. Mg^<2+> and SO_4^<2-> were found strongly depleted from the original mixed water. Na^<+> and K^<+> were moderately removed to low concentration. Ca^<2+> was leached
from rocks and resulted in the high concentration in the water. Removal of Mg^<2+> and other cations from the hot spring water was supplimented largely by leaching of Ca^<2+> from rocks. However, the
δ <18>^O shift by water-rock interaction is not observed. The water temperature at the depth might be about 140°C, and the similarity of δ <34>^S between the hot spring water and sea water suggests that the
water-convection was performed under oxidation condition.
It is suggested that both sea water and meteoric water were mixed together with the ratio of about 1:1, that the mixed water reacted mainly with the surrounding beach rock at shallow depth, and that the rate of water-rock interaction was not so high to shift the δ <18>^O, or the water/rock ratio was rather high not to affect the δ <18>O value.},
 pages = {1--7},
 title = {Water geochemistry of the Wewak region, East Sepik Province, Papua New Guinea},
 volume = {15},
 year = {1994},
 yomi = {ネダチ, ムネトモ and イノウエ, アキオ and タグチ, サチヒロ}
}