Specific Features of Sulfide Ores in the Pobeda Hydrothermal Cluster, Mid-Atlantic Rise 17°07′–17°08′ N

Габлина, И. Ф.; Dobretzova, I. G.; Laiba, A. A.; Narkevsky, Egor; Максимов, Ф. Е.; Kuznetsov, V. Yu.

doi:10.1134/s0024490218060020

Cited by 14 publications

(14 citation statements)

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“…calcite, aragonite and barite) or to fragments of altered hosted-rocks (e.g. chlorite) which also could influence the final age as it was already shown in Gablina et al (2018). Thus, the chronology should be reconstructed based on the studies of massive sulfide samples preferably comprised of primary sulfide minerals without secondary sulfides and/or non-sulfide minerals.…”

Section: Discussionmentioning

confidence: 96%

“…• the age of the bulk sample 107-10 composed of different generations of pyrite including older pyrite grains with trace of replacement is around 134.5±11.4 kyr (Gablina et al 2018), whereas the age of monomineral separates of unaltered younger pyrite (sample 107-10-1) is much lower -107.0±10.0 kyr ago; • the age for the bulk sample 204-2 composed of pyrite, marcasite, chalcopyrite, clinoatacamite and Fe hydroxides is around 113.7±9.9 kyr (Gablina et al, 2018); however, the analysis of monomineral separates 204-2-1 represented by unaltered overprinted pyrite gave precipitation age at 52.0±4.0 kyr ago. According to You and Bickle (1998), the 234 Th/U AR in sulfides may be distorted by U being subsequently fixed at oxidation-reduction boundaries of pyrite or lost from this mineral due to alteration process.…”

Section: Discussionmentioning

confidence: 99%

“…The first data of sample compositions and 230 Th/U ages from Pobeda cluster were obtained for different types of hydrothermal mineralization (massive sulfides, sulfide breccias and ore-bearing sediments) (Gablina et al, 2018). The present study focuses on 14 samples of massive sulfides only as they mark the direct precipitation from the high-temperature hydrothermal fluid in contact with seawater and could be better used for reconstruction of the history of hydrothermal activity.…”

Section: Materials and Analytical Methodsmentioning

confidence: 99%

“…The OCC is represented by gabbro-peridotite rocks exhumed on the rift valley slope along the detachment fault. The detailed geological description of the Pobeda cluster is given in a number of papers (Beltenev et al, 2015;Cherkashov et al, 2017;Amplieva et al, 2017;Gablina et al, 2018).…”

Section: Location and Site Descriptionmentioning

confidence: 99%

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Chronology of seafloor massive sulfides formation within the Pobeda hydrothermal cluster (Mid-Atlantic Ridge)

et al. 2020

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A geochronological and mineralogical study on the seafloor massive sulfides from the Pobeda hydrothermal cluster at the Mid-Atlantic Ridge was carried out. To improve the reliability of geochronological data, the 230Th/U ages were measured for both the bulk samples and monomineral separates. The oldest age ca. 52 kyr within Pobeda-1 and ca. 107 kyr within Pobeda–2 fields have been obtained. Then, several episodes of hydrothermal activity were identified within both fields up to ca. 0.3 kyr ago and up to ca. 4.3 kyr ago, respectively.

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Section: Discussionmentioning

confidence: 96%

Section: Discussionmentioning

confidence: 99%

Section: Materials and Analytical Methodsmentioning

confidence: 99%

Section: Location and Site Descriptionmentioning

confidence: 99%

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Chronology of seafloor massive sulfides formation within the Pobeda hydrothermal cluster (Mid-Atlantic Ridge)

et al. 2020

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“…Samples 37L107d-1,2 and 37L107-10 were taken from the hydrothermal field Pobeda-2 (Figure 1). The morphogenetic types and general mineral composition of the samples were previously described [34,35].…”

Section: Methodsmentioning

confidence: 99%

Pyrite Varieties at Pobeda Hydrothermal Fields, Mid-Atlantic Ridge 17°07′–17°08′ N: LA-ICP-MS Data Deciphering

et al. 2020

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The massive sulfide ores of the Pobeda hydrothermal fields are grouped into five main mineral microfacies: (1) isocubanite-pyrite, (2) pyrite-wurtzite-isocubanite, (3) pyrite with minor isocubanite and wurtzite-sphalerite microinclusions, (4) pyrite-rich with framboidal pyrite, and (5) marcasite-pyrite. This sequence reflects the transition from feeder zone facies to seafloor diffuser facies. Spongy, framboidal, and fine-grained pyrite varieties replaced pyrrhotite, greigite, and mackinawite “precursors”. The later coarse and fine banding oscillatory-zoned pyrite and marcasite crystals are overgrown or replaced by unzoned subhedral and euhedral pyrite. In the microfacies range, the amount of isocubanite, wurtzite, unzoned euhedral pyrite decreases versus an increasing portion of framboidal, fine-grained, and spongy pyrite and also marcasite and its colloform and radial varieties. The trace element characteristics of massive sulfides of Pobeda seafloor massive sulfide (SMS) deposit are subdivided into four associations: (1) high temperature—Cu, Se, Te, Bi, Co, and Ni; (2) mid temperature—Zn, As, Sb, and Sn; (3) low temperature—Pb, Sb, Ag, Bi, Au, Tl, and Mn; and (4) seawater—U, V, Mo, and Ni. The high contents of Cu, Co, Se, Bi, Te, and values of Co/Ni ratios decrease in the range from unzoned euhedral pyrite to oscillatory-zoned and framboidal pyrite, as well as to colloform and crystalline marcasite. The trend of Co/Ni values indicates a change from hydrothermal to hydrothermal-diagenetic crystallization of the pyrite. The concentrations of Zn, As, Sb, Pb, Ag, and Tl, as commonly observed in pyrite formed from mid- and low-temperature fluids, decline with increasing crystal size of pyrite and marcasite. Coarse oscillatory-zoned pyrite crystals contain elevated Mn compared to unzoned euhedral varieties. Framboidal pyrite hosts maximum concentrations of Mo, U, and V probably derived from ocean water mixed with hydrothermal fluids. In the Pobeda SMS deposit, the position of microfacies changes from the black smoker feeder zone at the base of the ore body, to seafloor marcasite-pyrite from diffuser fragments in sulfide breccias. We suggest that the temperatures of mineralization decreased in the same direction and determined the zonal character of deposit.

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Rare Minerals in the Ore-bearing Sediments of the Hydrothermal Cluster Pobeda (17°07.45´N. - 17°08.7´N MAR)

Габлина

Dara

Lyutkevich

2023

Springer Proceedings in Earth and Environmental Sciences

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Specific Features of Sulfide Ores in the Pobeda Hydrothermal Cluster, Mid-Atlantic Rise 17°07′–17°08′ N

Cited by 14 publications

References 5 publications

Chronology of seafloor massive sulfides formation within the Pobeda hydrothermal cluster (Mid-Atlantic Ridge)

Chronology of seafloor massive sulfides formation within the Pobeda hydrothermal cluster (Mid-Atlantic Ridge)

Pyrite Varieties at Pobeda Hydrothermal Fields, Mid-Atlantic Ridge 17°07′–17°08′ N: LA-ICP-MS Data Deciphering

Rare Minerals in the Ore-bearing Sediments of the Hydrothermal Cluster Pobeda (17°07.45´N. - 17°08.7´N MAR)

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