| Автор | Williams, J. G. |
| Автор | Harper, C. T. |
| Дата выпуска | 1978 |
| dc.description | AbstractIn the upper Eglinton area, the Eglinton Volcanics (Permian) are intruded by plutonic rocks mapped as the Mackay Intrusives. A sharp fault contact separating the Eglinton Volcanics from crystalline rocks of the Fiordland Complex, i.e., separating New Zealand's eastern and western provinces, is no longer recognised in this area and rocks previously mapped as Darran Diorite are now included within the Mackay Intrusives.The Mackay Intrusives are subdivided into six units. Two of these units, the Mistake Diorite and Gunn Dolerite, comprise discrete and relatively homogeneous bodies, whereas the other four are termed plutonic suites, each comprising a range of mutually overlapping rock types. Five K-Ar ages ranging from 208-180 m.y. have been obtained from the Mistake Diorite and are interpreted as indicating a Triassic age of intrusion. Leucocratic gabbroic to dioritic rocks in the upper Hollyford area yield ages of 136-130 m.y. and a trondhjemite dike cutting these rocks gives concordant biotite and muscovite ages of 113 m.y. The median tectonic line of Landis & Coombs is thought to be a pre-Cretaceous feature now obscured in this area by mid-late Mesozoic plutonism. |
| Формат | application.pdf |
| Издатель | Taylor & Francis Group |
| Копирайт | Copyright Taylor and Francis Group, LLC |
| Название | Age and status of the Mackay Intrusives in the Eglinton—upper Hollyford area |
| Тип | research-article |
| DOI | 10.1080/00288306.1978.10425202 |
| Electronic ISSN | 1175-8791 |
| Print ISSN | 0028-8306 |
| Журнал | New Zealand Journal of Geology and Geophysics |
| Том | 21 |
| Первая страница | 733 |
| Последняя страница | 742 |
| Аффилиация | Williams, J. G.; Geology Department, University of Otago |
| Аффилиация | Harper, C. T.; Geology Department, University of Otago |
| Выпуск | 6 |
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