Mineralogy of hydrothermal breccia cement of Humpa Leu East porphyry copper-gold prospect, Sumbawa Island, Indonesia

Indonesia is a country that has several world-class copper-gold deposits, particularly in eastern Sunda arc. The Hu’u complex has several prospects in the surface as lithocap of extensive epithermal style alteration, but some were detected associated with porphyry beneath the surface. The study focu...

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Autores principales:	Verdiansyah Okki, Idrus Arifudin, Setijadji Lucas Donny, Sutopo Bronto, Sukadana I Gde
Formato:	article
Lenguaje:	EN FR
Publicado:	EDP Sciences 2021
Materias:	porphyry gold copper mineralogy μ-xrf indonesia Environmental sciences GE1-350
Acceso en línea:	https://doaj.org/article/c1f3e54d912341e895cd8807c85c255b
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spelling	oai:doaj.org-article:c1f3e54d912341e895cd8807c85c255b2021-12-02T17:11:57ZMineralogy of hydrothermal breccia cement of Humpa Leu East porphyry copper-gold prospect, Sumbawa Island, Indonesia2267-124210.1051/e3sconf/202132504008https://doaj.org/article/c1f3e54d912341e895cd8807c85c255b2021-01-01T00:00:00Zhttps://www.e3s-conferences.org/articles/e3sconf/pdf/2021/101/e3sconf_icst2021_04008.pdfhttps://doaj.org/toc/2267-1242Indonesia is a country that has several world-class copper-gold deposits, particularly in eastern Sunda arc. The Hu’u complex has several prospects in the surface as lithocap of extensive epithermal style alteration, but some were detected associated with porphyry beneath the surface. The study focuses on hydrothermal breccia cement as a factor influencing the porphyry system in the Hu’u district. The methods used is mineralogical analysis with petrography and μ-XRF elemental mapping on hydrothermal breccia samples. The Hu’u district is interpreted as a paleo-volcano; a member of the Old Volcanics Rocks Formation. The Humpa Leu East lithology consists of pre-volcanics unit (lava and pyroclastics), diorite, andesite-μ-diorite, and tonalitic intrusion at the depth. Hydrothermal alteration evolved from tonalite body to outward, consist of potassic, inner propyllitic and overprinted by phyllic and advanced argillic. Several phases of hydrothermal activities occur in this system, including the hydrothermal breccia phase associated with complex fluids. The hydrothermal cement of Humpa Leu East porphyry at least have three phases of mineralogical assemblages and possibly influencing the mineralization. The mineralogical assemblage of hydrothermal cement in HLE consists of quartz-feldspar-plagioclase-biotite as a high-temperature phase; then followed by epidote-sericite-chlorites-anhydrite-carbonates in medium temperature; there are aluminum-rich clay minerals interpreted as gibbsite. Mineralization occurs in three phases including chalcopyrite-magnetite, bornite-chalcopyrite and chalcopyrite-sphalerite phases. The occurrences of chalcopyrite at all phases indicate the stability of intermediate sulfidation proses in Humpa Leu and as a possible factor to answer the abundant copper in the Hu’u hydrothermal fluid systemVerdiansyah OkkiIdrus ArifudinSetijadji Lucas DonnySutopo BrontoSukadana I GdeEDP Sciencesarticleporphyrygoldcoppermineralogyμ-xrfindonesiaEnvironmental sciencesGE1-350ENFRE3S Web of Conferences, Vol 325, p 04008 (2021)
institution	DOAJ
collection	DOAJ
language	EN FR
topic	porphyry gold copper mineralogy μ-xrf indonesia Environmental sciences GE1-350
spellingShingle	porphyry gold copper mineralogy μ-xrf indonesia Environmental sciences GE1-350 Verdiansyah Okki Idrus Arifudin Setijadji Lucas Donny Sutopo Bronto Sukadana I Gde Mineralogy of hydrothermal breccia cement of Humpa Leu East porphyry copper-gold prospect, Sumbawa Island, Indonesia
description	Indonesia is a country that has several world-class copper-gold deposits, particularly in eastern Sunda arc. The Hu’u complex has several prospects in the surface as lithocap of extensive epithermal style alteration, but some were detected associated with porphyry beneath the surface. The study focuses on hydrothermal breccia cement as a factor influencing the porphyry system in the Hu’u district. The methods used is mineralogical analysis with petrography and μ-XRF elemental mapping on hydrothermal breccia samples. The Hu’u district is interpreted as a paleo-volcano; a member of the Old Volcanics Rocks Formation. The Humpa Leu East lithology consists of pre-volcanics unit (lava and pyroclastics), diorite, andesite-μ-diorite, and tonalitic intrusion at the depth. Hydrothermal alteration evolved from tonalite body to outward, consist of potassic, inner propyllitic and overprinted by phyllic and advanced argillic. Several phases of hydrothermal activities occur in this system, including the hydrothermal breccia phase associated with complex fluids. The hydrothermal cement of Humpa Leu East porphyry at least have three phases of mineralogical assemblages and possibly influencing the mineralization. The mineralogical assemblage of hydrothermal cement in HLE consists of quartz-feldspar-plagioclase-biotite as a high-temperature phase; then followed by epidote-sericite-chlorites-anhydrite-carbonates in medium temperature; there are aluminum-rich clay minerals interpreted as gibbsite. Mineralization occurs in three phases including chalcopyrite-magnetite, bornite-chalcopyrite and chalcopyrite-sphalerite phases. The occurrences of chalcopyrite at all phases indicate the stability of intermediate sulfidation proses in Humpa Leu and as a possible factor to answer the abundant copper in the Hu’u hydrothermal fluid system
format	article
author	Verdiansyah Okki Idrus Arifudin Setijadji Lucas Donny Sutopo Bronto Sukadana I Gde
author_facet	Verdiansyah Okki Idrus Arifudin Setijadji Lucas Donny Sutopo Bronto Sukadana I Gde
author_sort	Verdiansyah Okki
title	Mineralogy of hydrothermal breccia cement of Humpa Leu East porphyry copper-gold prospect, Sumbawa Island, Indonesia
title_short	Mineralogy of hydrothermal breccia cement of Humpa Leu East porphyry copper-gold prospect, Sumbawa Island, Indonesia
title_full	Mineralogy of hydrothermal breccia cement of Humpa Leu East porphyry copper-gold prospect, Sumbawa Island, Indonesia
title_fullStr	Mineralogy of hydrothermal breccia cement of Humpa Leu East porphyry copper-gold prospect, Sumbawa Island, Indonesia
title_full_unstemmed	Mineralogy of hydrothermal breccia cement of Humpa Leu East porphyry copper-gold prospect, Sumbawa Island, Indonesia
title_sort	mineralogy of hydrothermal breccia cement of humpa leu east porphyry copper-gold prospect, sumbawa island, indonesia
publisher	EDP Sciences
publishDate	2021
url	https://doaj.org/article/c1f3e54d912341e895cd8807c85c255b
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_version_	1718381460514144256

Mineralogy of hydrothermal breccia cement of Humpa Leu East porphyry copper-gold prospect, Sumbawa Island, Indonesia

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