Argon-40: Excess in Submarine Pillow Basalts from Kilauea Volcano, Hawaii

Science  13 Sep 1968:
Vol. 161, Issue 3846, pp. 1132-1135
DOI: 10.1126/science.161.3846.1132


Submarine pillow basalts from Kilauea Volcano contain excess radiogenic argon-40 and give anomalously high potassium-argon ages. Glassy rims of pillows show a systematic increase in radiogenic argon-40 with depth, and a pillow from a depth of 2590 meters shows a decrease in radiogenic argon40 inward from the pillow rim. The data indicate that the amount of excess radiogenic argon-40 is a direct function of both hydrostatic pressure and rate of cooling, and that many submarine basalts are not suitable for potassium-argon dating.