Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Submersible observations of manganese nodule and crust deposits on the Tenpo Seamount, Northwestern Pacific
Pavements of manganese nodules and crusts and outcrops of Miocene limestones were observed on the flanks and flat top of the Tenpo Seamount during three Shinkai 2000 dives. The pre‐Miocene volcano supplied nuclei of volcanic rocks and hydrothermal manganese deposits, and subsequent slow or no sedimentation promoted deposition of abundant hydrogenetic nodules and crusts, mainly on the upper flank of the seamount. Nodule pavements generally cover calcareous sand surface sediments, while crusts cover hard outcrops composed probably of volcanic rocks. The fields of crusts and nodules are sparsely distributed with each other on scales of meters to tens of meters. The on‐site observation suggests the deposits have encountered tectonic and/or mass movements that resulted in unusual occurrences of densely stacked nodules and occasionally the nodules resting directly on crusts or hard substrates. Mineralogical and chemical compositions reveal that for nodules and crusts the encrusting manganese layers of around 1 cm thickness are composed of hydrogenetic vernadite, and diagenetic influence is negligible.
Submersible observations of manganese nodule and crust deposits on the Tenpo Seamount, Northwestern Pacific
Pavements of manganese nodules and crusts and outcrops of Miocene limestones were observed on the flanks and flat top of the Tenpo Seamount during three Shinkai 2000 dives. The pre‐Miocene volcano supplied nuclei of volcanic rocks and hydrothermal manganese deposits, and subsequent slow or no sedimentation promoted deposition of abundant hydrogenetic nodules and crusts, mainly on the upper flank of the seamount. Nodule pavements generally cover calcareous sand surface sediments, while crusts cover hard outcrops composed probably of volcanic rocks. The fields of crusts and nodules are sparsely distributed with each other on scales of meters to tens of meters. The on‐site observation suggests the deposits have encountered tectonic and/or mass movements that resulted in unusual occurrences of densely stacked nodules and occasionally the nodules resting directly on crusts or hard substrates. Mineralogical and chemical compositions reveal that for nodules and crusts the encrusting manganese layers of around 1 cm thickness are composed of hydrogenetic vernadite, and diagenetic influence is negligible.
Submersible observations of manganese nodule and crust deposits on the Tenpo Seamount, Northwestern Pacific
Usui, Akira (Autor:in) / Nishimura, Akira (Autor:in) / Iizasa, Kokichi (Autor:in)
Marine Georesources & Geotechnology ; 11 ; 263-291
01.10.1993
29 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
Microtopographic Analysis of Cobalt-Rich Manganese Deposits on a Mid-Pacific Seamount
| Online Contents | 1994
Microtopographic analysis of cobalt‐rich manganese deposits on a mid‐pacific seamount
| Taylor & Francis Verlag | 1994
| Taylor & Francis Verlag | 1998
Ferro-manganese pavement on San Pablo Seamount
| Engineering Index Backfile | 1968