Journal
JOURNAL OF ASIAN EARTH SCIENCES
Volume 42, Issue 3, Pages 208-222Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jseaes.2011.04.005
Keywords
Manganese deposit; Accretionary complex; Japan; Metamorphism; Deep-sea Mn-Fe nodules; Tectonics
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Funding
- Grants-in-Aid for Scientific Research [23403013] Funding Source: KAKEN
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In the accretionary complexes of Japan, many bedded manganese and iron-manganese ore deposits occur, especially in the Jurassic complexes such as the Chichibu, Tamba, Mino, Ashio and Northern Kitakami belts. The manganese ores in these Jurassic accretionary complexes probably formed from manganese nodule/crust-bearing siliceous sediments on deep-sea floor and were subsequently converted to the manganese ores by metamorphism during the subduction-accretion process. Some of the deposits also show the signatures of younger granitic intrusions. The manganese formations now incorporated within these belts are marker beds of accretionary tectonics associated with plate tectonic processes in convergent margins. (C) 2011 Elsevier Ltd. All rights reserved.
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