Geochemical and Mineralogical Characteristics of Garnierite From the Morowali Ni-Laterite Deposit in Sulawesi, Indonesia

The Morowali Ni-laterite deposit is located in the East Sulawesi Ophiolite, which is a large ophiolite belt on Sulawesi Island, Indonesia. The Morowali deposit is developed on a laterite profile due to ophiolite weathering, with saprolite, limonite, and ferruginous cap horizons from the bottom to to...

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Autores principales:	Yuri Choi, Insung Lee, Inkyeong Moon
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	Morowali Ni-laterite deposit garnierite Mg-Ni hydrous silicate ophiolite laterization Indonesia Science Q
Acceso en línea:	https://doaj.org/article/d630ab9ce8c64f89b27b001c63a58f76
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spelling	oai:doaj.org-article:d630ab9ce8c64f89b27b001c63a58f762021-11-30T21:13:55ZGeochemical and Mineralogical Characteristics of Garnierite From the Morowali Ni-Laterite Deposit in Sulawesi, Indonesia2296-646310.3389/feart.2021.761748https://doaj.org/article/d630ab9ce8c64f89b27b001c63a58f762021-11-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/feart.2021.761748/fullhttps://doaj.org/toc/2296-6463The Morowali Ni-laterite deposit is located in the East Sulawesi Ophiolite, which is a large ophiolite belt on Sulawesi Island, Indonesia. The Morowali deposit is developed on a laterite profile due to ophiolite weathering, with saprolite, limonite, and ferruginous cap horizons from the bottom to top. Based on the occurrence of garnierite as the main ore, occurring in the saprolite horizon, it can be classified that the ore deposit is hydrous Mg silicate-type. The Ni ore is classified into different types based on color and XRD and electron probe micro-analyzer analyses. Whole-rock geochemical study was also conducted to understand the mineralization process. The Morowali Ni deposit consists of serpentine-like and talc-like phases. The serpentine-like phase consists of Ni-lizardite and karpinskite (0.76–38.26 wt% NiO) while the talc-like phase is mainly composed of kerolite (4.02–8.02 wt% NiO). The serpentine-like garnierite exhibits high Ni and Fe contents and occurrence similar to that of the serpentine observed in the saprolite horizon, suggesting the serpentine-like garnierite originated from the bedrock, and Mg-Ni cation exchange occurred during laterization. Contrastingly, the lower Fe content of the talc-like phase (0.01–0.05 wt%) than the serpentine-like phase (0.14–7.03 wt%) indicates that the talc-like garnierite is of secondary origin since Fe is immobile during weathering. The Morowali Ni-laterite deposit was mainly formed during laterization. The repetition of dry and wet cycles in each year results in the formation of secondary garnierite.Yuri ChoiInsung LeeInkyeong MoonFrontiers Media S.A.articleMorowali Ni-laterite depositgarnieriteMg-Ni hydrous silicateophiolite laterizationIndonesiaScienceQENFrontiers in Earth Science, Vol 9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Morowali Ni-laterite deposit garnierite Mg-Ni hydrous silicate ophiolite laterization Indonesia Science Q
spellingShingle	Morowali Ni-laterite deposit garnierite Mg-Ni hydrous silicate ophiolite laterization Indonesia Science Q Yuri Choi Insung Lee Inkyeong Moon Geochemical and Mineralogical Characteristics of Garnierite From the Morowali Ni-Laterite Deposit in Sulawesi, Indonesia
description	The Morowali Ni-laterite deposit is located in the East Sulawesi Ophiolite, which is a large ophiolite belt on Sulawesi Island, Indonesia. The Morowali deposit is developed on a laterite profile due to ophiolite weathering, with saprolite, limonite, and ferruginous cap horizons from the bottom to top. Based on the occurrence of garnierite as the main ore, occurring in the saprolite horizon, it can be classified that the ore deposit is hydrous Mg silicate-type. The Ni ore is classified into different types based on color and XRD and electron probe micro-analyzer analyses. Whole-rock geochemical study was also conducted to understand the mineralization process. The Morowali Ni deposit consists of serpentine-like and talc-like phases. The serpentine-like phase consists of Ni-lizardite and karpinskite (0.76–38.26 wt% NiO) while the talc-like phase is mainly composed of kerolite (4.02–8.02 wt% NiO). The serpentine-like garnierite exhibits high Ni and Fe contents and occurrence similar to that of the serpentine observed in the saprolite horizon, suggesting the serpentine-like garnierite originated from the bedrock, and Mg-Ni cation exchange occurred during laterization. Contrastingly, the lower Fe content of the talc-like phase (0.01–0.05 wt%) than the serpentine-like phase (0.14–7.03 wt%) indicates that the talc-like garnierite is of secondary origin since Fe is immobile during weathering. The Morowali Ni-laterite deposit was mainly formed during laterization. The repetition of dry and wet cycles in each year results in the formation of secondary garnierite.
format	article
author	Yuri Choi Insung Lee Inkyeong Moon
author_facet	Yuri Choi Insung Lee Inkyeong Moon
author_sort	Yuri Choi
title	Geochemical and Mineralogical Characteristics of Garnierite From the Morowali Ni-Laterite Deposit in Sulawesi, Indonesia
title_short	Geochemical and Mineralogical Characteristics of Garnierite From the Morowali Ni-Laterite Deposit in Sulawesi, Indonesia
title_full	Geochemical and Mineralogical Characteristics of Garnierite From the Morowali Ni-Laterite Deposit in Sulawesi, Indonesia
title_fullStr	Geochemical and Mineralogical Characteristics of Garnierite From the Morowali Ni-Laterite Deposit in Sulawesi, Indonesia
title_full_unstemmed	Geochemical and Mineralogical Characteristics of Garnierite From the Morowali Ni-Laterite Deposit in Sulawesi, Indonesia
title_sort	geochemical and mineralogical characteristics of garnierite from the morowali ni-laterite deposit in sulawesi, indonesia
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/d630ab9ce8c64f89b27b001c63a58f76
work_keys_str_mv	AT yurichoi geochemicalandmineralogicalcharacteristicsofgarnieritefromthemorowalinilateritedepositinsulawesiindonesia AT insunglee geochemicalandmineralogicalcharacteristicsofgarnieritefromthemorowalinilateritedepositinsulawesiindonesia AT inkyeongmoon geochemicalandmineralogicalcharacteristicsofgarnieritefromthemorowalinilateritedepositinsulawesiindonesia
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Geochemical and Mineralogical Characteristics of Garnierite From the Morowali Ni-Laterite Deposit in Sulawesi, Indonesia

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