An examination of the possible occurrence of sea-floor spreading magnetic anomalies on Macquarie Island |
| |
| Authors: | P Williamson L V Hawkins B Long |
| |
| Institution: | (1) Applied Geology Dept, U.N.S.W., Kensington, NSW, Australia;(2) Mobil North Sea., 3 Clements Inn., WC2 London, England |
| |
| Abstract: | Macquarie Island is composed of rocks petrologically similar to those formed at accreting ocean ridges. For this reason a geophysical study of the island and the surrounding ocean was undertaken to examine the possible presence of sea-floor spreading magnetic anomalies. The marine magnetic phase of the study allowed sea-floor spreading anomalies from the Australian plate to be fentatively correlated across Macquarie Island. Macquaric Island occurring about anomaly 7 time (27 m.y.b.p.). The palaeomagnetic phase of the study produced an apparent palaeomagnetic pole for the island consistent with the above. Modelling of the on-land magnetics indicates that the on-land magnetic data reflect dominantly the remanent magnetic properties of the rocks. Exact identification of the time-reversal sequence was not possible, however, because of distruption caused by major faulting on the island. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
