Mineral–fluid interactions in the late Archean Closepet granite batholith, Dharwar Craton, southern India
| Autor: | Alicja Wudarska, Hans-Jürgen Förster, Jens Götze, Izabela Moszumańska, Ewa Słaby, Morihisa Hamada, Mudlappa Jayananda, Katarzyna Gros, Hervé Martin, Jean-François Moyen, Łukasz Birski |
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| Rok vydání: | 2019 |
| Předmět: |
Mineral
010504 meteorology & atmospheric sciences Archean Geochemistry Geology Ocean Engineering 010502 geochemistry & geophysics 01 natural sciences Dharwar Craton Apatite Batholith visual_art Magma visual_art.visual_art_medium Mafic Chemical composition 0105 earth and related environmental sciences Water Science and Technology |
| Zdroj: | Geological Society, London, Special Publications. 489:293-314 |
| ISSN: | 2041-4927 0305-8719 |
| Popis: | The chemical composition of different rocks as well as volatile-bearing and volatile-free minerals has been used to assess the presence of fluids in the Closepet batholith and to estimate the intensity of the fluid−rock interactions. The data were processed using polytopic vector analysis (PVA). Additional data include measurements of water content in the structure of volatile-free minerals and an examination of growth textures. The composition of mineral domains indicated formation/transformation processes with common fluid−mineral interactions. In general, the results suggested that the processes occurred in a ternary system. Two end-members were likely magmas and the third was enriched in fluids. In contrast, analysis of the apatite domains indicated that they likely formed/transformed in a more complex, four-component system. This system was fluid-rich and included hybrid magma with a large mafic component. PVA implies that the fluids do not appear to come from one source, given their close affinity and partial association with mantle-derived fluids. A dynamic tectonic setting promoting heat influx and redistribution, and interaction of fluids suggests that the formation/ transformation processes of minerals and rocks occurred in a hot-spot like environment. |
| Databáze: | OpenAIRE |
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