Garnet U-Pb and O isotopic determinations reveal a shear-zone induced hydrothermal system

Abstract The absolute crystallization ages of minerals from hydrothermal fluids measured in situ can unravel the timing of key events leading to the formation of, for instance, ore deposits and hydrothermally derived geological terrains. In this study, a skarn iron deposit from northwest (NW) China...

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Autores principales:	Zhongjiang Zang, Leilei Dong, Wei Liu, Han Zhao, Xinshui Wang, Keda Cai, Bo Wan
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2019
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/ccc989b1419940c4a78726b1dc4a921e
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spelling	oai:doaj.org-article:ccc989b1419940c4a78726b1dc4a921e2021-12-02T15:08:58ZGarnet U-Pb and O isotopic determinations reveal a shear-zone induced hydrothermal system10.1038/s41598-019-46868-42045-2322https://doaj.org/article/ccc989b1419940c4a78726b1dc4a921e2019-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-019-46868-4https://doaj.org/toc/2045-2322Abstract The absolute crystallization ages of minerals from hydrothermal fluids measured in situ can unravel the timing of key events leading to the formation of, for instance, ore deposits and hydrothermally derived geological terrains. In this study, a skarn iron deposit from northwest (NW) China is shown to have U-Pb garnet and U-Pb zircon ages of 254.2 ± 1.7 Ma and 255.5 ± 1.0 Ma, respectively, which are both significantly younger than magmatism and metamorphism of the region. This skarn age instead correlates with the occurrence of strike-slip and thrust faulting in the region. The water/rock mass ratio of 0.065~0.115 suggests the δ18O garnet composition is ~1‰ at temperatures ranging from 250–450 °C. The low oxygen isotopic composition indicates the role of meteoric water in the garnet formation. These measurements can be interpreted as the shear along faults circulating meteoric water ~10 km below the hanging wall of meta-volcanic sedimentary rock. Meteoric water in this hydrothermal system would leach cations from the meta-volcano-sedimentary rocks necessary for mineralization. Silica-rich hydrothermal fluid reacts with calcic-rich materials in the meta-volcano-sedimentary rocks, depositing the garnet and magnetite. Our work suggests that the shear zone is rich in ores, rendering this deposit for NW China a prospective source for future mineral resource exploration.Zhongjiang ZangLeilei DongWei LiuHan ZhaoXinshui WangKeda CaiBo WanNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 9, Iss 1, Pp 1-10 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Zhongjiang Zang Leilei Dong Wei Liu Han Zhao Xinshui Wang Keda Cai Bo Wan Garnet U-Pb and O isotopic determinations reveal a shear-zone induced hydrothermal system
description	Abstract The absolute crystallization ages of minerals from hydrothermal fluids measured in situ can unravel the timing of key events leading to the formation of, for instance, ore deposits and hydrothermally derived geological terrains. In this study, a skarn iron deposit from northwest (NW) China is shown to have U-Pb garnet and U-Pb zircon ages of 254.2 ± 1.7 Ma and 255.5 ± 1.0 Ma, respectively, which are both significantly younger than magmatism and metamorphism of the region. This skarn age instead correlates with the occurrence of strike-slip and thrust faulting in the region. The water/rock mass ratio of 0.065~0.115 suggests the δ18O garnet composition is ~1‰ at temperatures ranging from 250–450 °C. The low oxygen isotopic composition indicates the role of meteoric water in the garnet formation. These measurements can be interpreted as the shear along faults circulating meteoric water ~10 km below the hanging wall of meta-volcanic sedimentary rock. Meteoric water in this hydrothermal system would leach cations from the meta-volcano-sedimentary rocks necessary for mineralization. Silica-rich hydrothermal fluid reacts with calcic-rich materials in the meta-volcano-sedimentary rocks, depositing the garnet and magnetite. Our work suggests that the shear zone is rich in ores, rendering this deposit for NW China a prospective source for future mineral resource exploration.
format	article
author	Zhongjiang Zang Leilei Dong Wei Liu Han Zhao Xinshui Wang Keda Cai Bo Wan
author_facet	Zhongjiang Zang Leilei Dong Wei Liu Han Zhao Xinshui Wang Keda Cai Bo Wan
author_sort	Zhongjiang Zang
title	Garnet U-Pb and O isotopic determinations reveal a shear-zone induced hydrothermal system
title_short	Garnet U-Pb and O isotopic determinations reveal a shear-zone induced hydrothermal system
title_full	Garnet U-Pb and O isotopic determinations reveal a shear-zone induced hydrothermal system
title_fullStr	Garnet U-Pb and O isotopic determinations reveal a shear-zone induced hydrothermal system
title_full_unstemmed	Garnet U-Pb and O isotopic determinations reveal a shear-zone induced hydrothermal system
title_sort	garnet u-pb and o isotopic determinations reveal a shear-zone induced hydrothermal system
publisher	Nature Portfolio
publishDate	2019
url	https://doaj.org/article/ccc989b1419940c4a78726b1dc4a921e
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_version_	1718387966848532480

Garnet U-Pb and O isotopic determinations reveal a shear-zone induced hydrothermal system

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