Barite geochemistry from hydrothermal chimneys of the Okinawa Trough: insight into chimney formation and fluid/sediment interaction

Noguchi, Takuroh; Shinjo, Ryuichi; Ito, Motohiro; Takada, Jitsuya; Oomori, Tamotsu

doi:10.2465/jmps.090825

Cited by 53 publications

(24 citation statements)

References 34 publications

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“…Zeng et al (2009) reported minor elements composition and U-series isotope data of sulfide/ sulfate deposits. Noguchi et al (2011) reported 87 Sr/ 86 Sr data for barite collected from the Jade and Hakurei fields, which suggest a significant contribution of sediment.…”

Section: Jade Hydrothermal Field In the Izena Holementioning

confidence: 99%

Hydrothermal Activity in the Okinawa Trough Back-Arc Basin: Geological Background and Hydrothermal Mineralization

Ishibashi

Ikegami

Tsuji

et al. 2014

Subseafloor Biosphere Linked to Hydrothermal Systems

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The Okinawa Trough is a back-arc basin behind the Ryukyu trench-arc system and located along the eastern margin of the Eurasian continent. Sulfide and sulfate mineralization associated with hydrothermal activity has been recognized in ten hydrothermal fields in the Okinawa Trough. Hydrothermal mineralization recognized in these fields is commonly represented by coexisting occurrence of zinc-and lead-enriched polymetallic sulfides and abundant sulfate minerals. The mineralogy and geochemical signatures present has led researchers to suggest these areas may be a modern analogue for the formation of ancient Kuroko-type volcanogenic massive sulfide (VMS) deposits. Recent seafloor drilling during IODP (Integrated Ocean Drilling Program) Expedition 331 documented the subseafloor structure of a hydrothermal system at the Iheya North Knoll. Mineral textures and hydrothermal assemblages present in the drilled cores obtained from a hydrothermal mound in the proximal area are consistent with Kuroko-type mineralization. Based on geochemical studies, the intra-field diversity of mineralization commonly recognized in the Okinawa Trough can be explained by subseafloor phase separation of the hydrothermal fluid, which reflects shallow water depth (from 700 to 1,600 m). The subseafloor phase separation may. play an important role to accumulate metal elements beneath the seafloor. Based on geophysical and geological studies, the Okinawa Trough is considered a back-arc basin in the rifting stage. Such a tectonic setting is characterized by development of normal faulting in brittle continental crust and frequent intrusion of a magma, which can be expected to provide favorable environment for development of a hydrothermal system Keywords

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Section: Jade Hydrothermal Field In the Izena Holementioning

confidence: 99%

Hydrothermal Activity in the Okinawa Trough Back-Arc Basin: Geological Background and Hydrothermal Mineralization

Ishibashi

Ikegami

Tsuji

et al. 2014

Subseafloor Biosphere Linked to Hydrothermal Systems

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“…This mode of precipitation occurs at the seafloor near hydrothermal plumes and forms chimneys and mounds. It may also occur within the sediments as dispersed crystals in basement fractures at oceanic back-arc basin spreading centers, fracture zones, and volcanic arcs (e.g., East Pacific Rise 1 N, Huheey et al 1993; Tonga arc, south-west Pacific, Stoffers et al 2006; the Kurile and western Aleutian Island arcs, north-west Pacific, Glasby et al 2006; Okinawa and Mariana Troughs, Japan (Luders et al 2001;Noguchi et al 2011). Barite deposits are widely distributed in Iran.…”

Section: Introductionmentioning

confidence: 97%

Geology, geochemistry, sulfur isotope composition, and fluid inclusion data of Farsesh barite deposit, Lorestan Province, Iran

et al. 2014

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Farsesh barite in the central part of Iranian SanandajSirjan zone is a sample of epigenetic hydrothermal mineralization in dolomitized limestone, which provides appropriate chemicophysical conditions making the passage of mineralbearing fluids possible. Barite veins may range from a few centimeters to 2 m in thickness that increases downward. The microthermometry measurements obtained from more than 30 fluid inclusions show relative homogenization temperatures ranging from 125 to 200°C with an average of 110°C for Farsesh barite deposits. The mean salinity measured proves 16 times as much as weight percentage of NaCl for barite. Coexistence of liquid-and vapor-rich fluid inclusions in barite minerals may provide an evidence of boiling in ore veins. Moreover, occurrence of bladed calcite, high-grade ore zones, and presence of hydrothermal breccia are all consistent with boiling. Thermometric studies indicate that homogenization temperatures (Th) for primary and pseudosecondary fluid inclusions in barite range from 125 to 200°C with an average of 1,100°C. The δ 34 S values of barite also lie between 8.88 and 16.6 %. The relatively narrow spread in δ 34 S values may suggest uniform environmental conditions throughout the mineralization field. Thus, δ 34 S values are lower than those of contemporaneous seawater, which indicates a contribution of magmatic sulfur to the ore-forming solution. Barite is marked by total amounts of rare Earth elements (REEs) (6.25-17.39 ppm). Moreover, chondrite-normalized REE patterns of barite indicate a fractionation of light REEs (i.e., LREEs) from La to Sm, similar to those for barite from different origins. The La CN /Lu CN ratios and chondrite-normalized REE patterns reveal that barite in Farsesh deposit is enriched in LREEs compared with heavy rare Earth elements (HREEs). Similarity between Ce/La ratios in barite samples and those found in deep-sea barite supports its marine origin. Lanthanum and Gd exhibit positive anomalies, which are common features of chemical marine sediments. Cerium shows a negative anomaly in most samples inherited from the negative Ce anomaly of hydrothermal fluid that is mixed with seawater at barite precipitation. The available data including tectonic setting, host rock characteristics, REE geochemistry, and sulfur isotopic compositions may support a hydrothermal submarine origin for Farsesh barite deposit.

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“…The analytical procedures followed for chemical separation were based on the methods of Pin et al (1994) and Noguchi et al (2011) for Sr, Pin et al (1994) and Pin and Zalduegui (1997) for Nd, and Kuritani and Nakamura (2002) Gorbatov et al (1997).…”

Section: Methodsmentioning

confidence: 99%

A petrological and geochemical study on time-series samples from Klyuchevskoy volcano, Kamchatka arc

Bergal‐Kuvikas

Nakagawa

Kuritani

et al. 2017

Contrib Mineral Petrol

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Barite geochemistry from hydrothermal chimneys of the Okinawa Trough: insight into chimney formation and fluid/sediment interaction

Cited by 53 publications

References 34 publications

Hydrothermal Activity in the Okinawa Trough Back-Arc Basin: Geological Background and Hydrothermal Mineralization

Hydrothermal Activity in the Okinawa Trough Back-Arc Basin: Geological Background and Hydrothermal Mineralization

Geology, geochemistry, sulfur isotope composition, and fluid inclusion data of Farsesh barite deposit, Lorestan Province, Iran

A petrological and geochemical study on time-series samples from Klyuchevskoy volcano, Kamchatka arc

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