Geology and Geochemistry of Selected Gold Deposits in the Ailaoshan Metallogenic Belt, China: Origin of Ore-Forming Fluids

The formation of the Ailaoshan metallogenic belt was the result of: the Neoproterozoic super mantle plume, the Indosinian and South China blocks in the Late Triassic after the Paleo-Tethys Ocean closure, and Oligocene-Eocene continental-scale shearing related to the India-Eurasia collision. It is on...

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Autores principales:	Yang Li, Denghong Wang, Chenghui Wang, Yan Sun, MIMA Pu-chi
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	the Ailaoshan metallogenic belt geological characteristics of deposit chronological characteristics C-H-O-S-Pb isotopes Mineralogy QE351-399.2
Acceso en línea:	https://doaj.org/article/6d2840112d464b79aae54b5e65977b82
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spelling	oai:doaj.org-article:6d2840112d464b79aae54b5e65977b822021-11-25T18:26:47ZGeology and Geochemistry of Selected Gold Deposits in the Ailaoshan Metallogenic Belt, China: Origin of Ore-Forming Fluids10.3390/min111112762075-163Xhttps://doaj.org/article/6d2840112d464b79aae54b5e65977b822021-11-01T00:00:00Zhttps://www.mdpi.com/2075-163X/11/11/1276https://doaj.org/toc/2075-163XThe formation of the Ailaoshan metallogenic belt was the result of: the Neoproterozoic super mantle plume, the Indosinian and South China blocks in the Late Triassic after the Paleo-Tethys Ocean closure, and Oligocene-Eocene continental-scale shearing related to the India-Eurasia collision. It is one of the most important Cenozoic gold ore province in the world. In this paper, the geological characteristics, isotopic geochemistry, and geochemical data of ore-forming fluids of four large-scale gold deposits in the Ailaoshan metallogenic belt (Mojiang Jinchang, Zhenyuan Laowangzhai, Yuanyang Daping, and Jinping Chang’an) are comprehensively compared. The features of host-rock alteration, metallogenetic periods and stages, geochronology, fluid inclusion, and C-H-O-S-Pb isotopes of gold deposits are summarized and analyzed. The gold mineralization in the Ailaoshan metallogenic belt occurred mostly in 50–30 Ma, belonging to the Himalayan period. The gold mineralization is closely related to silicification, argillation, carbonation, and pyritization due to the strong mineralization of hydrothermal fluid, the development of alteration products, and the inconspicuous spatial zonation of alteration types. The ore-forming fluid is mainly composed of mantle fluid (magmatic water) and metamorphic fluid (metamorphic water). The ore-forming materials of the Jinchang, Chang’an, and Laowangzhai gold deposits mainly originate the host-rock strata of the mining area, and the carbon is more likely to from marine carbonate. The carbon in the Daping gold deposit from the original magma formed by the partial melting of the mantle. Pb isotopes have characteristics of crustal origin, accompanied by mixing of mantle-derived materials and multisource sulfur mixing, and are strongly homogenized.Yang LiDenghong WangChenghui WangYan SunMIMA Pu-chiMDPI AGarticlethe Ailaoshan metallogenic beltgeological characteristics of depositchronological characteristicsC-H-O-S-Pb isotopesMineralogyQE351-399.2ENMinerals, Vol 11, Iss 1276, p 1276 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	the Ailaoshan metallogenic belt geological characteristics of deposit chronological characteristics C-H-O-S-Pb isotopes Mineralogy QE351-399.2
spellingShingle	the Ailaoshan metallogenic belt geological characteristics of deposit chronological characteristics C-H-O-S-Pb isotopes Mineralogy QE351-399.2 Yang Li Denghong Wang Chenghui Wang Yan Sun MIMA Pu-chi Geology and Geochemistry of Selected Gold Deposits in the Ailaoshan Metallogenic Belt, China: Origin of Ore-Forming Fluids
description	The formation of the Ailaoshan metallogenic belt was the result of: the Neoproterozoic super mantle plume, the Indosinian and South China blocks in the Late Triassic after the Paleo-Tethys Ocean closure, and Oligocene-Eocene continental-scale shearing related to the India-Eurasia collision. It is one of the most important Cenozoic gold ore province in the world. In this paper, the geological characteristics, isotopic geochemistry, and geochemical data of ore-forming fluids of four large-scale gold deposits in the Ailaoshan metallogenic belt (Mojiang Jinchang, Zhenyuan Laowangzhai, Yuanyang Daping, and Jinping Chang’an) are comprehensively compared. The features of host-rock alteration, metallogenetic periods and stages, geochronology, fluid inclusion, and C-H-O-S-Pb isotopes of gold deposits are summarized and analyzed. The gold mineralization in the Ailaoshan metallogenic belt occurred mostly in 50–30 Ma, belonging to the Himalayan period. The gold mineralization is closely related to silicification, argillation, carbonation, and pyritization due to the strong mineralization of hydrothermal fluid, the development of alteration products, and the inconspicuous spatial zonation of alteration types. The ore-forming fluid is mainly composed of mantle fluid (magmatic water) and metamorphic fluid (metamorphic water). The ore-forming materials of the Jinchang, Chang’an, and Laowangzhai gold deposits mainly originate the host-rock strata of the mining area, and the carbon is more likely to from marine carbonate. The carbon in the Daping gold deposit from the original magma formed by the partial melting of the mantle. Pb isotopes have characteristics of crustal origin, accompanied by mixing of mantle-derived materials and multisource sulfur mixing, and are strongly homogenized.
format	article
author	Yang Li Denghong Wang Chenghui Wang Yan Sun MIMA Pu-chi
author_facet	Yang Li Denghong Wang Chenghui Wang Yan Sun MIMA Pu-chi
author_sort	Yang Li
title	Geology and Geochemistry of Selected Gold Deposits in the Ailaoshan Metallogenic Belt, China: Origin of Ore-Forming Fluids
title_short	Geology and Geochemistry of Selected Gold Deposits in the Ailaoshan Metallogenic Belt, China: Origin of Ore-Forming Fluids
title_full	Geology and Geochemistry of Selected Gold Deposits in the Ailaoshan Metallogenic Belt, China: Origin of Ore-Forming Fluids
title_fullStr	Geology and Geochemistry of Selected Gold Deposits in the Ailaoshan Metallogenic Belt, China: Origin of Ore-Forming Fluids
title_full_unstemmed	Geology and Geochemistry of Selected Gold Deposits in the Ailaoshan Metallogenic Belt, China: Origin of Ore-Forming Fluids
title_sort	geology and geochemistry of selected gold deposits in the ailaoshan metallogenic belt, china: origin of ore-forming fluids
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/6d2840112d464b79aae54b5e65977b82
work_keys_str_mv	AT yangli geologyandgeochemistryofselectedgolddepositsintheailaoshanmetallogenicbeltchinaoriginoforeformingfluids AT denghongwang geologyandgeochemistryofselectedgolddepositsintheailaoshanmetallogenicbeltchinaoriginoforeformingfluids AT chenghuiwang geologyandgeochemistryofselectedgolddepositsintheailaoshanmetallogenicbeltchinaoriginoforeformingfluids AT yansun geologyandgeochemistryofselectedgolddepositsintheailaoshanmetallogenicbeltchinaoriginoforeformingfluids AT mimapuchi geologyandgeochemistryofselectedgolddepositsintheailaoshanmetallogenicbeltchinaoriginoforeformingfluids
_version_	1718411136992280576

Geology and Geochemistry of Selected Gold Deposits in the Ailaoshan Metallogenic Belt, China: Origin of Ore-Forming Fluids

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