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| Titel: |
Age and significance of magnetizations in dolerite dykes from the Northampton Block, Western Australia |
| Auteur: |
Embleton, B. J. J. Schmidt, P. W. |
| Verschenen in: |
Australian journal of earth sciences |
| Paginering: | Jaargang 32 (1985) nr. 3 pagina's 279-286 |
| Jaar: |
1985-09 |
| Inhoud: |
Samples from nine dolerite dykes that outcrop in the Northampton Block, Western Australia, have been analysed to investigate the palaeomagnetic constraints that may be placed on the timing of magmatic events in relation to the widespread lead and zinc mineralization in the Northampton Mineral Field. The palaeomagnetic directions are consistent with a group of pole positions obtained from independent studies of formations of latest Precambrian and very earliest Cambrian age. The pole for the dykes lies at latitude 47.1°S, longitude 317.3°E (A95=7.9°). A comparison with the palaeomagnetic catalogue suggests that the dykes cannot be younger. Results from radiometric studies yield ages for two dykes at 550 Ma and a third dyke at 750 Ma. The results indicate that the dykes were intruded considerably earlier than the mineralization age (late-Early to early-Mid Paleozoic) and hence cast doubt on the role of the intrusive event as either the source of mineralization or the principal catalyst for the mobilization of pre-existing mineral deposits. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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