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Continuous growth of hydrogenetic ferromanganese crusts since 17 Myr ago on Takuyo-Daigo Seamount, NW Pacific, at water depths of 800-5500 m

Continuous growth of hydrogenetic ferromanganese crusts since 17 Myr ago on Takuyo-Daigo Seamount, NW Pacific, at water depths of 800-5500 m
Continuous growth of hydrogenetic ferromanganese crusts since 17 Myr ago on Takuyo-Daigo Seamount, NW Pacific, at water depths of 800-5500 m
Ferromanganese crusts cover all outcrops on Takuyo-Daigo seamount traversed during remotely operated underwater vehicle (ROV) dives, except in places covered by foraminifera sand. Takuyo-Daigo is a Cretaceous seamount located in the northwest Pacific Ocean. Geological and bathymetric mapping provide the framework for this study. Chemical and mineralogical analyses of the hydrogenetic ferromanganese crusts show temporal and spatial variations typical of those found in previous studies. Outcrops from 800 to 5500 m water depths are covered with ferromanganese crusts up to 105 mm thick. Beryllium isotope dating shows that the crusts have apparently been growing continuously at all water depths, even through the modern oxygen minimum zone (OMZ), contrary to some earlier models for deposition. Growth rates vary from 2.3 to 3.5 mm/Myr, with Fe or Mn fluxes of 0.07–0.11 g/cm2/Myr since the early-middle Miocene. Co/Mn ratios decrease with water depth while Fe/Mn and other metallic elements increase or show no change, based on the analysis of the uppermost crust surface. This is probably because Co is the most abundant redox-sensitive element derived from seawater that occurs in crusts.
0169-1368
71-87
Usui, Akira
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Nishi, Keisuke
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Sato, Hisaaki
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Nakasato, Yoshio
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Thornton, Blair
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Kashiwabara, Teruhiko
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Tokumaru, Ayaka
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Sakagu, Aya
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Yamaoka, Kyoko
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Kato, Shingo
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Nitahara, Shota
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Suzuki, Katsuhiko
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Iijima, Koichi
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Urabe, Tetsuro
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Usui, Akira
be71e28c-6636-4fea-8240-d4008cf04f12
Nishi, Keisuke
d0b838aa-b225-40a8-80f0-789ed99d7481
Sato, Hisaaki
30066bd5-d3ac-43ad-bec4-a1bd0d9d445a
Nakasato, Yoshio
b76c5edc-1bc1-49c8-903b-26b7fa995704
Thornton, Blair
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Kashiwabara, Teruhiko
4873e3f8-faa4-479b-8d40-b374736c4a40
Tokumaru, Ayaka
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Sakagu, Aya
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Yamaoka, Kyoko
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Kato, Shingo
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Nitahara, Shota
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Suzuki, Katsuhiko
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Iijima, Koichi
1c1a5e34-d93c-4dbb-8200-fce9b6b2407b
Urabe, Tetsuro
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Usui, Akira, Nishi, Keisuke, Sato, Hisaaki, Nakasato, Yoshio, Thornton, Blair, Kashiwabara, Teruhiko, Tokumaru, Ayaka, Sakagu, Aya, Yamaoka, Kyoko, Kato, Shingo, Nitahara, Shota, Suzuki, Katsuhiko, Iijima, Koichi and Urabe, Tetsuro (2017) Continuous growth of hydrogenetic ferromanganese crusts since 17 Myr ago on Takuyo-Daigo Seamount, NW Pacific, at water depths of 800-5500 m. Ore Geology Reviews, 87, 71-87. (doi:10.1016/j.oregeorev.2016.09.032).

Record type: Article

Abstract

Ferromanganese crusts cover all outcrops on Takuyo-Daigo seamount traversed during remotely operated underwater vehicle (ROV) dives, except in places covered by foraminifera sand. Takuyo-Daigo is a Cretaceous seamount located in the northwest Pacific Ocean. Geological and bathymetric mapping provide the framework for this study. Chemical and mineralogical analyses of the hydrogenetic ferromanganese crusts show temporal and spatial variations typical of those found in previous studies. Outcrops from 800 to 5500 m water depths are covered with ferromanganese crusts up to 105 mm thick. Beryllium isotope dating shows that the crusts have apparently been growing continuously at all water depths, even through the modern oxygen minimum zone (OMZ), contrary to some earlier models for deposition. Growth rates vary from 2.3 to 3.5 mm/Myr, with Fe or Mn fluxes of 0.07–0.11 g/cm2/Myr since the early-middle Miocene. Co/Mn ratios decrease with water depth while Fe/Mn and other metallic elements increase or show no change, based on the analysis of the uppermost crust surface. This is probably because Co is the most abundant redox-sensitive element derived from seawater that occurs in crusts.

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1-s2.0-S0169136816302062-main.pdf__tid=e80376b6-8a6a-11e6-8104-00000aab0f6b&acdnat=1475610424_0b633606bf1786084bcac9aa9712da2d - Accepted Manuscript
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Accepted/In Press date: 26 September 2016
e-pub ahead of print date: 29 September 2016
Published date: July 2017
Organisations: Fluid Structure Interactions Group

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Local EPrints ID: 401146
URI: http://eprints.soton.ac.uk/id/eprint/401146
ISSN: 0169-1368
PURE UUID: a56be5b5-828c-4e32-8b60-bf599b4d9bdb

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Date deposited: 10 Oct 2016 11:01
Last modified: 28 Apr 2022 05:20

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Contributors

Author: Akira Usui
Author: Keisuke Nishi
Author: Hisaaki Sato
Author: Yoshio Nakasato
Author: Blair Thornton
Author: Teruhiko Kashiwabara
Author: Ayaka Tokumaru
Author: Aya Sakagu
Author: Kyoko Yamaoka
Author: Shingo Kato
Author: Shota Nitahara
Author: Katsuhiko Suzuki
Author: Koichi Iijima
Author: Tetsuro Urabe

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