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 TiO2 and poor in SiO2, MgO, and CaO, similar to magnetite from Kiruna type deposits. The hydrothermal magnetite is rich in FeO, CaO, and SiO2 but poor in TiO2 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.
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Research Article|
July 07, 2020
Re–Os dating of pyrite and mineral chemistry of magnetite from the Yamansu Fe deposit, Xinjiang, northwestern China
Zhi-yuan Sun;
a
Beijing Institute of Geology for Mineral Resources, Beijing, 100012, People’s Republic of China.b
Technic Research Center for Deep Resources Exploration in Non-ferrous Metal Mines, Beijing, 100012, People’s Republic of China.Corresponding author: Zhiyuan Sun (email: [email protected]).
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Jing-bin Wang;
Jing-bin Wang
a
Beijing Institute of Geology for Mineral Resources, Beijing, 100012, People’s Republic of China.b
Technic Research Center for Deep Resources Exploration in Non-ferrous Metal Mines, Beijing, 100012, People’s Republic of China.
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Yu-wang Wang;
Yu-wang Wang
a
Beijing Institute of Geology for Mineral Resources, Beijing, 100012, People’s Republic of China.b
Technic Research Center for Deep Resources Exploration in Non-ferrous Metal Mines, Beijing, 100012, People’s Republic of China.
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Ling-li Long;
Ling-li Long
a
Beijing Institute of Geology for Mineral Resources, Beijing, 100012, People’s Republic of China.b
Technic Research Center for Deep Resources Exploration in Non-ferrous Metal Mines, Beijing, 100012, People’s Republic of China.
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Zhao-hua Luo
Zhao-hua Luo
c
School of the Earth Sciences and Resources, China University of Geosciences (Beijing), Beijing, 100083, People’s Republic of China.
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a
Beijing Institute of Geology for Mineral Resources, Beijing, 100012, People’s Republic of China.b
Technic Research Center for Deep Resources Exploration in Non-ferrous Metal Mines, Beijing, 100012, People’s Republic of China.
Jing-bin Wang
a
Beijing Institute of Geology for Mineral Resources, Beijing, 100012, People’s Republic of China.b
Technic Research Center for Deep Resources Exploration in Non-ferrous Metal Mines, Beijing, 100012, People’s Republic of China.
Yu-wang Wang
a
Beijing Institute of Geology for Mineral Resources, Beijing, 100012, People’s Republic of China.b
Technic Research Center for Deep Resources Exploration in Non-ferrous Metal Mines, Beijing, 100012, People’s Republic of China.
Ling-li Long
a
Beijing Institute of Geology for Mineral Resources, Beijing, 100012, People’s Republic of China.b
Technic Research Center for Deep Resources Exploration in Non-ferrous Metal Mines, Beijing, 100012, People’s Republic of China.
Zhao-hua Luo
c
School of the Earth Sciences and Resources, China University of Geosciences (Beijing), Beijing, 100083, People’s Republic of China.Corresponding author: Zhiyuan Sun (email: [email protected]).
Publisher: Canadian Science Publishing
Received:
17 Sep 2019
Accepted:
14 Feb 2020
First Online:
17 Feb 2021
Online ISSN: 1480-3313
Print ISSN: 0008-4077
Published by NRC Research Press
Canadian Journal of Earth Sciences (2021) 58 (2): 150–163.
Article history
Received:
17 Sep 2019
Accepted:
14 Feb 2020
First Online:
17 Feb 2021
Citation
Zhi-yuan Sun, Jing-bin Wang, Yu-wang Wang, Ling-li Long, Zhao-hua Luo; Re–Os dating of pyrite and mineral chemistry of magnetite from the Yamansu Fe deposit, Xinjiang, northwestern China. Canadian Journal of Earth Sciences 2020;; 58 (2): 150–163. doi: https://doi.org/10.1139/cjes-2019-0178
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Index Terms/Descriptors
- absolute age
- Asia
- Carboniferous
- chemical analysis
- China
- Far East
- hydrothermal alteration
- hydrothermal conditions
- iron ores
- magmatism
- magnetite
- metal ores
- metamorphic rocks
- metasomatic rocks
- metasomatism
- oxides
- Paleozoic
- pyrite
- Re/Os
- skarn
- sulfides
- Tien Shan
- trace-element analyses
- Xinjiang China
- Yamansu Deposit
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