Ore Genesis of the Takatori Tungsten–Quartz Vein Deposit, Japan: Chemical and Isotopic Evidence
The Takatori hypothermal tin–tungsten vein deposit is composed of wolframite-bearing quartz veins with minor cassiterite, chalcopyrite, pyrite, and lithium-bearing muscovite and sericite. Several wolframite rims show replacement textures, which are assumed to form by iron replacement with manganese...
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MDPI AG
2021-07-01
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| Series: | Minerals |
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| Online Access: | https://www.mdpi.com/2075-163X/11/7/765 |
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| author | Yuichi Morishita Yoshiro Nishio |
| author_facet | Yuichi Morishita Yoshiro Nishio |
| author_sort | Yuichi Morishita |
| collection | DOAJ |
| description | The Takatori hypothermal tin–tungsten vein deposit is composed of wolframite-bearing quartz veins with minor cassiterite, chalcopyrite, pyrite, and lithium-bearing muscovite and sericite. Several wolframite rims show replacement textures, which are assumed to form by iron replacement with manganese postdating the wolframite precipitation. Lithium isotope ratios (δ<sup>7</sup>Li) of Li-bearing muscovite from the Takatori veins range from −3.1‰ to −2.1‰, and such Li-bearing muscovites are proven to occur at the early stage of mineralization. Fine-grained sericite with lower Li content shows relatively higher δ<sup>7</sup>Li values, and might have precipitated after the main ore forming event. The maximum oxygen isotope equilibrium temperature of quartz–muscovite pairs is 460 °C, and it is inferred that the fluids might be in equilibrium with ilmenite series granitic rocks. Oxygen isotope ratios (δ<sup>18</sup>O) of the Takatori ore-forming fluid range from +10‰ to +8‰. The δ<sup>18</sup>O values of the fluid decreased with decreasing temperature probably because the fluid was mixed with surrounding pore water and meteoric water. The formation pressure for the Takatori deposit is calculated to be 160 MPa on the basis of the difference between the pressure-independent oxygen isotope equilibrium temperature and pressure-dependent homogenization fluid inclusions temperature. The ore-formation depth is calculated to be around 6 km. These lines of evidence suggest that a granitic magma beneath the deposit played a crucial role in the Takatori deposit formation. |
| first_indexed | 2024-03-10T09:31:38Z |
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| id | doaj.art-96342431d4cc4b9282ca10f57b485f17 |
| institution | Directory Open Access Journal |
| issn | 2075-163X |
| language | English |
| last_indexed | 2024-03-10T09:31:38Z |
| publishDate | 2021-07-01 |
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| series | Minerals |
| spelling | doaj.art-96342431d4cc4b9282ca10f57b485f172023-11-22T04:28:16ZengMDPI AGMinerals2075-163X2021-07-0111776510.3390/min11070765Ore Genesis of the Takatori Tungsten–Quartz Vein Deposit, Japan: Chemical and Isotopic EvidenceYuichi Morishita0Yoshiro Nishio1Shizuoka University, 836 Ohya, Shizuoka 422-8529, JapanFaculty of Agriculture and Marine Science, Kochi University, Monobe B200, Nankoku, Kochi 783-8502, JapanThe Takatori hypothermal tin–tungsten vein deposit is composed of wolframite-bearing quartz veins with minor cassiterite, chalcopyrite, pyrite, and lithium-bearing muscovite and sericite. Several wolframite rims show replacement textures, which are assumed to form by iron replacement with manganese postdating the wolframite precipitation. Lithium isotope ratios (δ<sup>7</sup>Li) of Li-bearing muscovite from the Takatori veins range from −3.1‰ to −2.1‰, and such Li-bearing muscovites are proven to occur at the early stage of mineralization. Fine-grained sericite with lower Li content shows relatively higher δ<sup>7</sup>Li values, and might have precipitated after the main ore forming event. The maximum oxygen isotope equilibrium temperature of quartz–muscovite pairs is 460 °C, and it is inferred that the fluids might be in equilibrium with ilmenite series granitic rocks. Oxygen isotope ratios (δ<sup>18</sup>O) of the Takatori ore-forming fluid range from +10‰ to +8‰. The δ<sup>18</sup>O values of the fluid decreased with decreasing temperature probably because the fluid was mixed with surrounding pore water and meteoric water. The formation pressure for the Takatori deposit is calculated to be 160 MPa on the basis of the difference between the pressure-independent oxygen isotope equilibrium temperature and pressure-dependent homogenization fluid inclusions temperature. The ore-formation depth is calculated to be around 6 km. These lines of evidence suggest that a granitic magma beneath the deposit played a crucial role in the Takatori deposit formation.https://www.mdpi.com/2075-163X/11/7/765Takatori deposithypothermaltungstenquartz veinoxygen isotopeslithium isotopes |
| spellingShingle | Yuichi Morishita Yoshiro Nishio Ore Genesis of the Takatori Tungsten–Quartz Vein Deposit, Japan: Chemical and Isotopic Evidence Minerals Takatori deposit hypothermal tungsten quartz vein oxygen isotopes lithium isotopes |
| title | Ore Genesis of the Takatori Tungsten–Quartz Vein Deposit, Japan: Chemical and Isotopic Evidence |
| title_full | Ore Genesis of the Takatori Tungsten–Quartz Vein Deposit, Japan: Chemical and Isotopic Evidence |
| title_fullStr | Ore Genesis of the Takatori Tungsten–Quartz Vein Deposit, Japan: Chemical and Isotopic Evidence |
| title_full_unstemmed | Ore Genesis of the Takatori Tungsten–Quartz Vein Deposit, Japan: Chemical and Isotopic Evidence |
| title_short | Ore Genesis of the Takatori Tungsten–Quartz Vein Deposit, Japan: Chemical and Isotopic Evidence |
| title_sort | ore genesis of the takatori tungsten quartz vein deposit japan chemical and isotopic evidence |
| topic | Takatori deposit hypothermal tungsten quartz vein oxygen isotopes lithium isotopes |
| url | https://www.mdpi.com/2075-163X/11/7/765 |
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