Re–Os dating of pyrite and mineral chemistry of magnetite from the Yamansu Fe deposit, Xinjiang, northwestern China
The Yamansu iron deposit, hosted in submarine volcanic rocks, is located in the Aqishan–Yamansu Fe–Cu metallogenic belt of eastern Tianshan, Xinjiang. New pyrite Re–Os and pyroxene diorite intrusion ages and the chemistry of magnetite constrain the origin of the deposit. The Yamansu orebodies displa...
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crcansciencepubl:10.1139/cjes-2019-0178 2023-12-17T10:32:56+01:00 Re–Os dating of pyrite and mineral chemistry of magnetite from the Yamansu Fe deposit, Xinjiang, northwestern China Sun, Zhi-yuan Wang, Jing-bin Wang, Yu-wang Long, Ling-li Luo, Zhao-hua 2021 http://dx.doi.org/10.1139/cjes-2019-0178 https://cdnsciencepub.com/doi/full-xml/10.1139/cjes-2019-0178 https://cdnsciencepub.com/doi/pdf/10.1139/cjes-2019-0178 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 58, issue 2, page 150-163 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 2021 crcansciencepubl https://doi.org/10.1139/cjes-2019-0178 2023-11-19T13:38:44Z The Yamansu iron deposit, hosted in submarine volcanic rocks, is located in the Aqishan–Yamansu Fe–Cu metallogenic belt of eastern Tianshan, Xinjiang. New pyrite Re–Os and pyroxene diorite intrusion ages and the chemistry of magnetite constrain the origin of the deposit. The Yamansu orebodies display banded or lenticular forms and sharp contacts with marble and garnet skarn. Pyrite associated with magnetite from hydrothermal massive ores has a Re–Os isochron age of 320.3 ± 9.1 Ma, which is consistent with the Carboniferous age of volcanic rocks. However, the pyroxene diorite age (252.1 ± 3.7 Ma) is obviously younger than the mineralization age, implying no temporal relationship between mineralization and intrusion. Magnetite samples from different ores in the Yamansu deposit are suggested to have a magmatic–hydrothermal origin. The magmatic primary magnetite is rich in TiO 2 and poor in SiO 2 , MgO, and CaO, similar to magnetite from Kiruna type deposits. The hydrothermal magnetite is rich in FeO, CaO, and SiO 2 but poor in TiO 2 and shows oscillatory zoning. Moreover, magmatic and hydrothermal magnetite samples show different characteristic normalized rare earth element and trace element patterns. A combination of ore fabrics, discrimination diagrams, and normalized patterns for magnetite samples can reflect the magmatic–hydrothermal process. The Yamansu iron deposit is spatially and temporally associated with Carboniferous volcanism, and we propose that the magmatic magnetite ores were derived from iron-rich melt through melt immiscibility. The residual iron-rich magma ascended and erupted along with hydrothermal activity; then moderate to large amounts of hydrothermal massive, banded, or disseminated magnetite formed with skarns. Article in Journal/Newspaper Kiruna Canadian Science Publishing (via Crossref) Kiruna Canadian Journal of Earth Sciences 58 2 150 163 |
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Canadian Science Publishing (via Crossref) |
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General Earth and Planetary Sciences Sun, Zhi-yuan Wang, Jing-bin Wang, Yu-wang Long, Ling-li Luo, Zhao-hua Re–Os dating of pyrite and mineral chemistry of magnetite from the Yamansu Fe deposit, Xinjiang, northwestern China |
topic_facet |
General Earth and Planetary Sciences |
description |
The Yamansu iron deposit, hosted in submarine volcanic rocks, is located in the Aqishan–Yamansu Fe–Cu metallogenic belt of eastern Tianshan, Xinjiang. New pyrite Re–Os and pyroxene diorite intrusion ages and the chemistry of magnetite constrain the origin of the deposit. The Yamansu orebodies display banded or lenticular forms and sharp contacts with marble and garnet skarn. Pyrite associated with magnetite from hydrothermal massive ores has a Re–Os isochron age of 320.3 ± 9.1 Ma, which is consistent with the Carboniferous age of volcanic rocks. However, the pyroxene diorite age (252.1 ± 3.7 Ma) is obviously younger than the mineralization age, implying no temporal relationship between mineralization and intrusion. Magnetite samples from different ores in the Yamansu deposit are suggested to have a magmatic–hydrothermal origin. The magmatic primary magnetite is rich in TiO 2 and poor in SiO 2 , MgO, and CaO, similar to magnetite from Kiruna type deposits. The hydrothermal magnetite is rich in FeO, CaO, and SiO 2 but poor in TiO 2 and shows oscillatory zoning. Moreover, magmatic and hydrothermal magnetite samples show different characteristic normalized rare earth element and trace element patterns. A combination of ore fabrics, discrimination diagrams, and normalized patterns for magnetite samples can reflect the magmatic–hydrothermal process. The Yamansu iron deposit is spatially and temporally associated with Carboniferous volcanism, and we propose that the magmatic magnetite ores were derived from iron-rich melt through melt immiscibility. The residual iron-rich magma ascended and erupted along with hydrothermal activity; then moderate to large amounts of hydrothermal massive, banded, or disseminated magnetite formed with skarns. |
format |
Article in Journal/Newspaper |
author |
Sun, Zhi-yuan Wang, Jing-bin Wang, Yu-wang Long, Ling-li Luo, Zhao-hua |
author_facet |
Sun, Zhi-yuan Wang, Jing-bin Wang, Yu-wang Long, Ling-li Luo, Zhao-hua |
author_sort |
Sun, Zhi-yuan |
title |
Re–Os dating of pyrite and mineral chemistry of magnetite from the Yamansu Fe deposit, Xinjiang, northwestern China |
title_short |
Re–Os dating of pyrite and mineral chemistry of magnetite from the Yamansu Fe deposit, Xinjiang, northwestern China |
title_full |
Re–Os dating of pyrite and mineral chemistry of magnetite from the Yamansu Fe deposit, Xinjiang, northwestern China |
title_fullStr |
Re–Os dating of pyrite and mineral chemistry of magnetite from the Yamansu Fe deposit, Xinjiang, northwestern China |
title_full_unstemmed |
Re–Os dating of pyrite and mineral chemistry of magnetite from the Yamansu Fe deposit, Xinjiang, northwestern China |
title_sort |
re–os dating of pyrite and mineral chemistry of magnetite from the yamansu fe deposit, xinjiang, northwestern china |
publisher |
Canadian Science Publishing |
publishDate |
2021 |
url |
http://dx.doi.org/10.1139/cjes-2019-0178 https://cdnsciencepub.com/doi/full-xml/10.1139/cjes-2019-0178 https://cdnsciencepub.com/doi/pdf/10.1139/cjes-2019-0178 |
geographic |
Kiruna |
geographic_facet |
Kiruna |
genre |
Kiruna |
genre_facet |
Kiruna |
op_source |
Canadian Journal of Earth Sciences volume 58, issue 2, page 150-163 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/cjes-2019-0178 |
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Canadian Journal of Earth Sciences |
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58 |
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2 |
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150 |
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163 |
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