The kyanite quartzite of Bosland (Suriname): evidence for a Precambrian metamorphosed alteration system
| Autor: | Bijnaar, Ginny, van Bergen, Manfred J., Wong, Theo E., Petrology |
|---|---|
| Přispěvatelé: | Petrology |
| Rok vydání: | 2016 |
| Předmět: |
Suriname
Felsic 010504 meteorology & atmospheric sciences Metamorphic rock kyanite Geochemistry Metamorphism Geology Greenstone belt Proterozoic 010502 geochemistry & geophysics 01 natural sciences Kyanite Precambrian visual_art visual_art.visual_art_medium Argillic alteration hydrothermal alteration Petrology quartzites Metamorphic facies 0105 earth and related environmental sciences |
| Zdroj: | Geologie en Mijnbouw/Netherlands Journal of Geosciences, 95(4), 447. Cambridge University Press 2010 |
| ISSN: | 1573-9708 0016-7746 |
| DOI: | 10.1017/njg.2016.38 |
| Popis: | This article investigates the origin of a rare occurrence of kyanite quartzites in the Palaeoproterozoic greenstone belt of Suriname. The rocks form elongated hills in the Bosland area, Brokopondo district, where they are associated with meta-sedimentary, meta-volcanic and granitic lithologies. Their mineral content and unusual Si- and Al-rich chemical composition are inferred to be the result of advanced argillic alteration of felsic volcanic tuffs and a later overprint by regional metamorphism up to lower amphibolite facies during the Trans-Amazonian orogeny. Structurally, the Bosland area seems centred within a contractional strike-slip duplex of a major dextral fault system. The alteration was probably associated with a high-sulphidation environment and involved significant to almost complete removal of alkali and alkaline earth elements. Pseudosection modelling and textures suggest that the precipitation–temperature (P–T) history of the kyanite quartzites started with shallow (T>350°C), and ended in peak metamorphic conditions in the kyanite–staurolite stability field (P>4kbar andT=500–650°C). Alteration events that preceded the peak of Trans-Amazonian metamorphism may be more common in the rock record of Suriname's greenstone belt, which lends support to the hypothesis that gold mineralisations in the region can be pre-orogenic. |
| Databáze: | OpenAIRE |
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