Au and Te minerals in seafloor massive sulphides from semyenov-2 hydrothermal field, mid-atlantic ridge

Anna Firstova, Tamara Stepanova, Anna Sukhanova , Georgy Cherkashov, Irina Poroshina

Результат исследований: Научные публикации в периодических изданияхстатья

1 цитирование (Scopus)

Выдержка

The Semyenov-2 hydrothermal field located at 13°31′N of the Mid-Atlantic Ridge (MAR) is associated with an oceanic core complex (OCC) and hosted by peridotites and basalts with minor amounts of gabbro and plagiogranites. Seafloor massive sulphides (SMS) are represented by chimneys with zonality, massive sulphides without zonality and sulphide breccia cemented by opal and aragonite. The mean value of Au (20.6 ppm) and Te (40 ppm) is much higher than average for the MAR SMS deposits (3.2 ppm and 8.0 ppm, respectively). Generally, these high concentrations reflect the presence of a wide diversity of Au and Te minerals associated with major mineral paragenesis: primary native gold, melonite (NiTe2) and tellurobismuthite (Bi2Te3) are related to high-temperature chalcopyrite (~350 °C); electrum (AuAg)1, hessite (Ag2Te) and altaite (PbTe) are related to medium- and low-temperature Zn-sulphide and opal assemblages (260–230 °C). Calaverite (AuTe2) and Te-rich “fahlore” Cu12(Sb,As,Te)4S13 are texturally related to the chalcopyrite-bornite-covellite. Enrichment of Au in sulphide breccia with opal and aragonite cement is driven by the re-deposition and the process of hydrothermal reworking of sulphide. The low-temperature fluid mobilizes gold from primary sulphide, along with Au and Te minerals. As a result, the secondary gold re-precipitate in cement of sulphide breccia. An additional contribution of Au enrichment is the presence of aragonite in the Cu-Zn breccia where the maximal Au content (188 ppm) is reached.
Язык оригиналаанглийский
Номер статьи294
Число страниц30
ЖурналMinerals
Том9
Номер выпуска5
DOI
СостояниеОпубликовано - 19 мая 2019

Предметные области Scopus

  • Геотехническая инженерия и инженерная геология
  • Геология

Цитировать

Firstova, Anna ; Stepanova, Tamara ; Sukhanova , Anna ; Cherkashov, Georgy ; Poroshina , Irina . / Au and Te minerals in seafloor massive sulphides from semyenov-2 hydrothermal field, mid-atlantic ridge. В: Minerals. 2019 ; Том 9, № 5.
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title = "Au and Te minerals in seafloor massive sulphides from semyenov-2 hydrothermal field, mid-atlantic ridge",
abstract = "The Semyenov-2 hydrothermal field located at 13°31′N of the Mid-Atlantic Ridge (MAR) is associated with an oceanic core complex (OCC) and hosted by peridotites and basalts with minor amounts of gabbro and plagiogranites. Seafloor massive sulphides (SMS) are represented by chimneys with zonality, massive sulphides without zonality and sulphide breccia cemented by opal and aragonite. The mean value of Au (20.6 ppm) and Te (40 ppm) is much higher than average for the MAR SMS deposits (3.2 ppm and 8.0 ppm, respectively). Generally, these high concentrations reflect the presence of a wide diversity of Au and Te minerals associated with major mineral paragenesis: primary native gold, melonite (NiTe2) and tellurobismuthite (Bi2Te3) are related to high-temperature chalcopyrite (~350 °C); electrum (AuAg)1, hessite (Ag2Te) and altaite (PbTe) are related to medium- and low-temperature Zn-sulphide and opal assemblages (260–230 °C). Calaverite (AuTe2) and Te-rich “fahlore” Cu12(Sb,As,Te)4S13 are texturally related to the chalcopyrite-bornite-covellite. Enrichment of Au in sulphide breccia with opal and aragonite cement is driven by the re-deposition and the process of hydrothermal reworking of sulphide. The low-temperature fluid mobilizes gold from primary sulphide, along with Au and Te minerals. As a result, the secondary gold re-precipitate in cement of sulphide breccia. An additional contribution of Au enrichment is the presence of aragonite in the Cu-Zn breccia where the maximal Au content (188 ppm) is reached.",
keywords = "Aragonite, Gold, Hydrothermal processes, Mechanism of precipitation, Mid-Atlantic Ridge, Oceanic core complex, Seafloor massive sulphides, Tellurides",
author = "Anna Firstova and Tamara Stepanova and Anna Sukhanova and Georgy Cherkashov and Irina Poroshina",
year = "2019",
month = "5",
day = "19",
doi = "10.3390/min9050294",
language = "English",
volume = "9",
journal = "Minerals",
issn = "2075-163X",
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Au and Te minerals in seafloor massive sulphides from semyenov-2 hydrothermal field, mid-atlantic ridge. / Firstova, Anna; Stepanova, Tamara; Sukhanova , Anna ; Cherkashov, Georgy; Poroshina , Irina .

В: Minerals, Том 9, № 5, 294, 19.05.2019.

Результат исследований: Научные публикации в периодических изданияхстатья

TY - JOUR

T1 - Au and Te minerals in seafloor massive sulphides from semyenov-2 hydrothermal field, mid-atlantic ridge

AU - Firstova, Anna

AU - Stepanova, Tamara

AU - Sukhanova , Anna

AU - Cherkashov, Georgy

AU - Poroshina , Irina

PY - 2019/5/19

Y1 - 2019/5/19

N2 - The Semyenov-2 hydrothermal field located at 13°31′N of the Mid-Atlantic Ridge (MAR) is associated with an oceanic core complex (OCC) and hosted by peridotites and basalts with minor amounts of gabbro and plagiogranites. Seafloor massive sulphides (SMS) are represented by chimneys with zonality, massive sulphides without zonality and sulphide breccia cemented by opal and aragonite. The mean value of Au (20.6 ppm) and Te (40 ppm) is much higher than average for the MAR SMS deposits (3.2 ppm and 8.0 ppm, respectively). Generally, these high concentrations reflect the presence of a wide diversity of Au and Te minerals associated with major mineral paragenesis: primary native gold, melonite (NiTe2) and tellurobismuthite (Bi2Te3) are related to high-temperature chalcopyrite (~350 °C); electrum (AuAg)1, hessite (Ag2Te) and altaite (PbTe) are related to medium- and low-temperature Zn-sulphide and opal assemblages (260–230 °C). Calaverite (AuTe2) and Te-rich “fahlore” Cu12(Sb,As,Te)4S13 are texturally related to the chalcopyrite-bornite-covellite. Enrichment of Au in sulphide breccia with opal and aragonite cement is driven by the re-deposition and the process of hydrothermal reworking of sulphide. The low-temperature fluid mobilizes gold from primary sulphide, along with Au and Te minerals. As a result, the secondary gold re-precipitate in cement of sulphide breccia. An additional contribution of Au enrichment is the presence of aragonite in the Cu-Zn breccia where the maximal Au content (188 ppm) is reached.

AB - The Semyenov-2 hydrothermal field located at 13°31′N of the Mid-Atlantic Ridge (MAR) is associated with an oceanic core complex (OCC) and hosted by peridotites and basalts with minor amounts of gabbro and plagiogranites. Seafloor massive sulphides (SMS) are represented by chimneys with zonality, massive sulphides without zonality and sulphide breccia cemented by opal and aragonite. The mean value of Au (20.6 ppm) and Te (40 ppm) is much higher than average for the MAR SMS deposits (3.2 ppm and 8.0 ppm, respectively). Generally, these high concentrations reflect the presence of a wide diversity of Au and Te minerals associated with major mineral paragenesis: primary native gold, melonite (NiTe2) and tellurobismuthite (Bi2Te3) are related to high-temperature chalcopyrite (~350 °C); electrum (AuAg)1, hessite (Ag2Te) and altaite (PbTe) are related to medium- and low-temperature Zn-sulphide and opal assemblages (260–230 °C). Calaverite (AuTe2) and Te-rich “fahlore” Cu12(Sb,As,Te)4S13 are texturally related to the chalcopyrite-bornite-covellite. Enrichment of Au in sulphide breccia with opal and aragonite cement is driven by the re-deposition and the process of hydrothermal reworking of sulphide. The low-temperature fluid mobilizes gold from primary sulphide, along with Au and Te minerals. As a result, the secondary gold re-precipitate in cement of sulphide breccia. An additional contribution of Au enrichment is the presence of aragonite in the Cu-Zn breccia where the maximal Au content (188 ppm) is reached.

KW - Aragonite

KW - Gold

KW - Hydrothermal processes

KW - Mechanism of precipitation

KW - Mid-Atlantic Ridge

KW - Oceanic core complex

KW - Seafloor massive sulphides

KW - Tellurides

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U2 - 10.3390/min9050294

DO - 10.3390/min9050294

M3 - Article

VL - 9

JO - Minerals

JF - Minerals

SN - 2075-163X

IS - 5

M1 - 294

ER -