A Mesoproterozoic continental flood rhyolite province, the Gawler Ranges, Australia: the end member example of the Large Igneous Province clan
| Autor: | M. J. Pankhurst, B. F. Schaefer, P. G. Betts, N. Phillips, M. Hand |
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| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: | |
| Zdroj: | Solid Earth, Vol 2, Iss 1, Pp 25-33 (2011) |
| Druh dokumentu: | article |
| ISSN: | 1869-9510 1869-9529 |
| DOI: | 10.5194/se-2-25-2011 |
| Popis: | Rhyolite and dacite lavas of the Mesoproterozoic upper Gawler Range Volcanics (GRV) (>30 000 km3 preserved), South Australia, represent the remnants of one of the most voluminous felsic magmatic events preserved on Earth. Geophysical interpretation suggests eruption from a central cluster of feeder vents which supplied large-scale lobate flows >100 km in length. Pigeonite inversion thermometers indicate eruption temperatures of 950–1100 °C. The lavas are A-type in composition (e.g. high Ga/Al ratios) and characterised by elevated primary halogen concentrations (~1600 ppm fluorine, ~400 ppm chlorine). These depolymerised the magma such that temperature-composition-volatile non-Arrhenian melt viscosity modelling suggests they had viscosities of |
| Databáze: | Directory of Open Access Journals |
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