Mineralogy, geochemistry and microbiology insights into precipitation of stibnite and orpiment at the Daiyon-Yonaguni Knoll (Okinawa Trough) hydrothermal barite deposits

Dekov, Vesselin M.; Kyono, K.; Yasukawa, Kazutaka; Guéguen, Bleuenn; Ivarsson, Magnus; Kamenov, George D.; Yamanaka, Toshiro; Asael, Dan; Ishida, Mizuki; Cavalcante, L.L.; Kato, Yasuhiro; Toki, Tomohiro; Ishibashi, Jun Ichiro

doi:10.1016/j.chemgeo.2022.121092

Cited by 3 publications

(3 citation statements)

References 140 publications

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“…The enrichment of excess Ba in marine shale usually occurs under two conditions: high primary productivity and the significant impact of submarine hydrothermal activities on shale reservoirs. Barite veins at the low-resistivity samples from Well N21 exhibit obvious positive Eu anomalies (1.71-1.83) compared with those at the normal resistivity shale samples (1.1 to 1.4), where Eu concentration is significantly lower than that at the Lower Cambrian Doushantuo barite [62][63][64][65][66]. Meanwhile, barite veins in the investigated low-resistivity samples are low in REE concentration (164.3 to 216.31 ppm) and Ce/La (0.8-2.5).…”

Section: Sulfatization Stagementioning

confidence: 92%

“…Additionally, brunswigite-mica hydrothermal mineral assemblages, barite, hyalophane, and anhydrite assemblages also indicate multiple sulfatization stages in hydrothermal activities (Figure 7). Independent Ba-bearing minerals, e.g., barite and hyalophane, can be developed under sufficient Ba supply [46,62,63]. The enrichment of excess Ba in marine shale usually occurs under two conditions: high primary productivity and the significant impact of submarine hydrothermal activities on shale reservoirs.…”

Section: Sulfatization Stagementioning

confidence: 99%

“…It is frequently considered an indicator of hydrothermal activity [62,68] because of its co-existence with barium-enriched hydrothermal fluids. A comparison of hyalophane from the Longmaxi low-resistivity shale and typical hydrothermal fluids in the world shows that they are similar in major elements (Figure 14, [35,46,62,63,68]). The existence of hyalophane has been believed to be related to the hydrothermally induced diagenetic transformation of K-feldspar, based on previous investigations on the relationship between hyalophane and surrounding minerals in ore deposits [35,65].…”

Section: Feldspathisation Stagementioning

confidence: 99%

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Influence of Low-Temperature Hydrothermal Events and Basement Fault System on Low-Resistivity Shale Reservoirs: A Case Study from the Upper Ordovician to Lower Silurian in the Sichuan Basin, SW China

Zhou,

Cai,

Mou

et al. 2023

Minerals

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High graphitization is responsible for low-resistivity shale development with poor reservoir quality. This paper provides an explanation of organic matter graphitization and determines the impact of high graphite content on low-resistivity shale reservoir quality at the Wufeng-Longmaxi Formation in the Southern Sichuan Basin. Fine veins are frequently developed at shale samples with Ro > 3.5%, graphitized organic matter > 25%, and resistivity < 5 Ω•m, which are dominated by three mineral assemblages: brunsvigite, barite-hyalophane-barium feldspar-potassium feldspar-anhydrite, and calcite-ankerite. These filling minerals are characterized by an Eu positive anomaly and high Ba, Fe, and Mn contents, suggesting that low-resistivity shale was modified by magmatic-related low-temperature hydrothermal fluid. Temperature measurements of brine inclusions and a semi-empirical geothermometer of chlorite show that low-temperature hydrothermal fluid experienced the chlorite stage (150–180 °C), the low-sulfidation stage (120–150 °C), and the low-temperature calcitization stage. Paleozoic fault systems and late Permian hydrothermal activities associated with the Emeishan mantle plume control the graphitization of low-resistivity shale. The water formation and seawater infiltrated into the deep crust along the Paleozoic basement faults under gravity, developing alkaline hot brine through mantle plume heating and then causing a water-rock reaction with basement rocks. They migrated upward along deep and large Paleozoic faults through convective thermal circulation in the Tiangongtang area, the Shuanglong-Luochang area, and the Xuyong area. Cation exchange and redox reactions occurred during the interaction between high-temperature hydrothermal fluid and cool wall rocks. The migration of alkaline hot brine via the Wufeng-Longmaxi shale introduced a subsequent water-rock reaction, resulting in the development of hydrothermal mineral assemblages that intricately filled fractures. It increased formation temperature and enhanced thermal maturity and graphitization of organic matter at the Wufeng-Longmaxi low-resistivity shale, resulting in a wide distribution of low-resistivity shale at the Changning Block.

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Section: Sulfatization Stagementioning

confidence: 92%

Section: Sulfatization Stagementioning

confidence: 99%

Section: Feldspathisation Stagementioning

confidence: 99%

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Influence of Low-Temperature Hydrothermal Events and Basement Fault System on Low-Resistivity Shale Reservoirs: A Case Study from the Upper Ordovician to Lower Silurian in the Sichuan Basin, SW China

Zhou,

Cai,

Mou

et al. 2023

Minerals

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Hydrothermal amorphous silica, barite and orpiment from the crater area of seamount (SM-13) off Nicobar island, Andaman sea: Indications for the development of a new hydrothermal field

Peketi,

Sriram,

Mazumdar

et al. 2024

Marine and Petroleum Geology

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Mineralogical and geochemical facets of the massive deposition of stibnite-metastibnite at a seafloor hydrothermal field (Wakamiko Crater, Kagoshima Bay, Ryukyu Volcanic Arc)

Dekov,

Furuma,

Guéguen

et al. 2024

American Mineralogist

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Stibnite precipitates in the form of massive boulders at two active hydrothermal mounds in the submarine Wakamiko Crater (Ryukyu Volcanic Arc) as opposed to commonly observed accessory stibnite in the seafloor hydrothermal deposits. The stibnite dimorph, metastibnite, found here for the first time on the seafloor, appears to always form whenever stibnite is precipitated under submarine hydrothermal conditions. Our study shows that hydrothermal conditions of low temperatures (<50 °C) and low values of pH (<6) are favorable for the precipitation of stibnite on the seafloor. The stibnite probably does not precipitate at the measured vent fluid temperatures (i.e., 177.6 – 187.0 °C) along the chimney conduits, but rather at temperatures <50 °C and at slightly reduced to slightly oxic conditions (Eh = -0.5 to +0.5 V) within the chimney walls and hydrothermal mounds. Metastibnite deposition appears to be the result of rapid quenching of hot hydrothermal fluid when mixed with cold seawater and rapid precipitation at the interface between stibnite and vent fluid. The low concentrations (usually below detection limits) of the trace elements (Cd, Co, Cr, Cu, Li, Mn, Mo, Ni, P, Pb, Sr, V, Zn) in the stibnite deposits from Wakamiko Crater are likely a result of decreased metal-transporting capacity of the precipitating vent fluid due to its low chlorinity. Low-chlorinity venting implies sub-seafloor boiling and phase separation of the hydrothermal fluid. Sluggish hydrothermal fluid/seawater mixing within the walls of the chimneys and mounds favors the reduction of sulfate dissolved in the hydrothermal fluids and results in a heavy S isotope composition of the sulfate in the vent fluids. Sulfate reduction and disproportionation of magmatic SO2, both leading to heavy S isotope composition of sulfate in the vent fluids, seem to be common processes in volcanic arc/back-arc submarine hydrothermal settings.

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Mineralogy, geochemistry and microbiology insights into precipitation of stibnite and orpiment at the Daiyon-Yonaguni Knoll (Okinawa Trough) hydrothermal barite deposits

Cited by 3 publications

References 140 publications

Influence of Low-Temperature Hydrothermal Events and Basement Fault System on Low-Resistivity Shale Reservoirs: A Case Study from the Upper Ordovician to Lower Silurian in the Sichuan Basin, SW China

Influence of Low-Temperature Hydrothermal Events and Basement Fault System on Low-Resistivity Shale Reservoirs: A Case Study from the Upper Ordovician to Lower Silurian in the Sichuan Basin, SW China

Hydrothermal amorphous silica, barite and orpiment from the crater area of seamount (SM-13) off Nicobar island, Andaman sea: Indications for the development of a new hydrothermal field

Mineralogical and geochemical facets of the massive deposition of stibnite-metastibnite at a seafloor hydrothermal field (Wakamiko Crater, Kagoshima Bay, Ryukyu Volcanic Arc)

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