A new occurrence of hydrous andradite within pyroclastic rocks of the Sierra De Bahoruco, Dominican Republic

Wachowiak, Jacek; Dumańska-Słowik, Magdalena; Heflik, Wiesław; Włodek, Adam; Natkaniec-Nowak, Lucyna; Peña, Miguel; Gaweł, Adam; Muñoz, Rolando; Jeleń, Piotr

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Abstract:	Titanium-bearing hydrous andradite (up to 3.31 wt% TiO2) was identified in intensely altered pyroclastic rocks in the Sierra de Bahoruco, Dominican Republic. It forms small isolated crystals, fracture infillings, and large polycrystalline aggregates, associated with clinochlore and calcite. Other minerals in the secondary assemblage, formed through hydrothermal or supergenic processes, include prehnite, pumpellyite, and natrolite. This assemblage resulted from metasomatism under low-temperature zeolite facies conditions, requiring high-pH fluids enriched in Ca and Fe. The calcium needed for garnet crystallization likely came from primary calcic plagioclases, diopside, and surrounding limestones. Geothermometry on coexisting chlorite indicates that andradite formed at around 160°C under oxidizing conditions. This hydrous titanian garnet represents one of the latest stages of calcium metasomatism in the region.
Author(s):	Wachowiak, Jacek Dumańska-Słowik, Magdalena Heflik, Wiesław Włodek, Adam Natkaniec-Nowak, Lucyna Peña, Miguel Gaweł, Adam Muñoz, Rolando Jeleń, Piotr
Date:	2024
Published:	Scientific Reports, 14(1), 1-20
Citation:	Wachowiak, J., Dumańska-Słowik, M., Heflik, W., Włodek, A., Natkaniec-Nowak, L., Peña, M., ... & Jeleń, P. (2024). A new occurrence of hydrous andradite within pyroclastic rocks of the Sierra de Bahoruco, Dominican Republic. Scientific Reports, 14(1), 1-20. Recuperado de:
URI:	https://bvearmb.do/handle/123456789/5500

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Access and downloading this document are subject to this license: This article is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License, which permits any non-commercial use, sharing, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if you modified the licensed material. You do not have permission under this licence to share adapted material derived from this article or parts of it.