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地球学报 2012
日本西南部四国增生复合体中的锰矿分布Keywords: Manganesedeposit,Accretionarycomplex,Shikoku,Metamorphism,Deep-seamanganesenodule/crust Abstract: BeddedmanganeseoredepositsoccurinmanylocalitieswithintheaccretionarybeltsoftheShikokuregion,SWJapan.Thedepositsoccurmostlyinbeddedchertoritsmetamorphosedequivalent.Thesechert-hostedmanganesedepositsareconsideredtohavebeenmanganesenodule/crust-bearingsiliceoussedimentsondeep-seafloorandhavebeenconvertedtomanganeseoresbylow-grademetamorphismthroughsubduction-accretionprocess.Themineralassemblagesoftheoresreflectthemetamorphicgradeoftheaccretionarycomplexes.Ontheotherhand,iron-manganesedepositsandsomemanganesedepositsoccurringdirectlyoverbasaltareconsideredtohavebeenthehydrothermalprecipitatesassociatedwithsubmarinevolcanism.
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