Citation: | Hong Cao, Zhi-lei Sun, Chang-ling Liu, En-tao Liu, Xue-jun Jiang, Wei Huang, 2018. Origin of natural sulfur-metal chimney in the Tangyin hydrothermal field, Okinawa Trough: constraints from rare earth element and sulfur isotopic compositions, China Geology, 1, 225-235. doi: 10.31035/cg2018023 |
For the first time, we present the rare earth element (REE) and sulfur isotopic composition of hydrothermal precipitates recovered from the Tangyin hydrothermal field (THF), Okinawa Trough at a water depth of 1206 m. The natural sulfur samples exhibit the lowest ΣREE concentrations (ΣREE=0.65×10–6–4.580×10–6) followed by metal sulfides (ΣREE=1.71×10–6–11.63×10–6). By contrast, the natural sulfur-sediment samples have maximum ΣREE concentrations (ΣREE=11.54×10–6–33.06×10–6), significantly lower than those of the volcanic and sediment samples. Nevertheless, the δEu, δCe, (La/Yb)N, La/Sm, (Gd/Yb)N and normalized patterns of the natural sulfur and metal sulfide show the most similarity to the sediment. Most hydrothermal precipitate samples are characterized by enrichments of LREE (LREE/HREE=10.09–24.53) and slightly negative Eu anomalies or no anomaly (δEu=0.48–0.99), which are different from the hydrothermal fluid from sediment-free mid-oceanic ridges and back-arc basins, but identical to the sulfides from the Jade hydrothermal field. The lower temperature and more oxidizing conditions produced by the mixing between seawater and hydrothermal fluids further attenuate the leaching ability of hydrothermal fluid, inducing lower REE concentrations for natural sulfur compared with metal sulfide; meanwhile, the negative Eu anomaly is also weakened or almost absent. The sulfur isotopic compositions of the natural sulfur (δ34S=3.20‰–5.01‰, mean 4.23‰) and metal sulfide samples (δ34S=0.82‰–0.89‰, mean 0.85‰) reveal that the sulfur of the chimney is sourced from magmatic degassing.
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Location of the Tangyin (delimited by the red star), Jade (orange dot) and Kueishantao (yellow dot) hydrothermal fields along the Okinama Trough. The regional bathymetry is modified from Kimura M (1985), Sibuet M et al.(1987) and Shang LN et al.(2017). The bold orange dashed line indicates the Ryukyu Volcanic Front. Blue lines indicate the major faults: MFB–Miyako Fault Belt; YKFB–Yushan Kume Fault Belt; ZKFB–Zhoushan Kunigami Fault Belt; TFB–Tokara Fault Belt. Red bars show the Okinama Trough central grabens: YoG–Yonaguni Graben; YaG–Yaeyama Graben; SG–Sakishima Graben; KG–Kerama Graben; AG–Aguni Graben; IG–Iheya Graben. NOT–Northern Okinawa Trough; MOT–Middle Okinawa Trough; SOT–Southern Okinawa Trough. Bathymetric data come from the Marine Geoscience Data System (
Representative hydrothermal precipitate samples recovered from the THF. (a) natural sulfur (sample TY-6), the surface is covered with a thin layer of sediment, and millimeter to centimeter holes can be seen on the surface; (b) natural sulfur (sample TY-8) with larger sub-rounded channel filled with natural sulfur (yellow dotted lines show channel location); (c) natural sulfur (sample TY-4); (d) natural sulfur (sample TY-1) coexisting with metal sulfide (4 cm×3 cm blue boxes); a large cavity (4 cm×7 cm) can be seen in the natural sulfur chimney, likely caused by gas eruption, with an interior cavity wall of pure natural sulfur;(e) EDS spectrum of the natural sulfur in image 2c (as indicated by the yellow dot in image 2c); (f) close-up of the area in the yellow framework of image 2d, showing a section of the sulfide chimney (yellow dotted lines show locations of metal sulfides);(g) SEM images of the natural sulfur; (h) SEM images of pyrite and sphalerite. S–natural sulfur, Py–pyrite, Sp–sphalerite.
Chondrite-normalized REE patterens of natural sulfur samples from the Tangyin hydrothermal field. REE values of seawater, dacite, andesite, basalt and sediment are from Gillis KM et al. (1990), Zhai SK and Gan XQ (1995), Li WR et al. (1997), and Zhao Y (1983) respectively.
(a) Correlation between the LREE and Fe of hydrothermal precipitates. (b) Correlation between the ΣREE and Fe of hydrothermal precipitates.
Normalized REE patterns of natural sulfur samples from the THF. REE values of seawater, dacite, andesite, basalt and sediment are from Gillis KM et al. (1990), Zhai SK and Gan XQ(1995), and Li WR et al. (1997) respectively.
Distribution of the δ34S of different hydrothermal precipitates from the THF: yellow bar indicates natural sulfur-sediment, purple bar indicates natural sulfur, and pink bar indicates the metal sulfide.
Sulfur isotope values of natural sulfur-metal sulfide samples from different seafloor hydrothermal fields: red bar indicates metal sulfide; green bar indicates natural sulfur-sediment; yellow bar indicates natural sulfur. Andesite from Ueda A and Sakai H (1984) and Woodhead JD et al. (1987), Mid-Ocean Ridge Basalt from Sakai H et al. (1984), seawater from Rees CE et al. (1978), Kueishantao natural sulfur from Zeng ZG et al. (2007), Jadenatural sulfur from Marumo K and Hattori KH (1999) and Zeng ZG et al. (2002), Lau Basin natural sulfur from Herzig PM et al. (1998), and Onsen natural sulfur from Gena KR et al. (2006).