典型文献
Pure forsterite in Nyiragongo lavas:evidence for subsolidus oxidation of volcanic rocks
文献摘要：
Some volcanic rocks from Nyiragongo volcano in the Democratic Republic of Congo contain highly oxi-dized olivine crystals.These olivines crystals are made of two phases,dark olivine on backscattered electron images of pure forsterite composition and grey Mg-poor areas made of olivine and iron-rich oxides.Calculation of the initial composition confirms that they are primary olivine with late separation of two different olivine compositions.Pure forsterite is enriched in SiO2 but contains lower amounts of CaO than Fe-rich areas,in agreement with expected partitioning of these elements related to the composition of the olivine.Iron-rich oxides formed around or inside the olivine crystals during the separation process and confirm a highly oxidized environment during their evolution.We propose that this separation occurred during subsolidus recrystallization under high fO2 conditions of the olivine crystals after cooling of the volcanic rocks.It provides evidences for circulation of iron-rich fluids or gas inducing deuteritic processes occurring in the large vol-canic cone of the Nyiragongo,in relation with the presence of a shallow magma chamber connected to a large and permanent lava lake.
文献关键词：
中图分类号：
作者姓名：
Innocent Badriyo Agama;Gilles Chazot;Pierre Kamgang
作者机构：
Département Des Sciences de la Terre,Faculté Des Sciences,Université de Yaoundé I,B.P.812,Yaoundé,Cameroon;Observatoire Volcanologique de Goma,B.P.484,Goma,Nord-Kivu,Democratic Republic of the Congo;Laboratoire Géosciences Océan,Institut Universitaire Européen de la Mer,Université de Brest (UBO),UMR 6538,Place Copernic,29280 Plouzané,France
文献出处：
引用格式：
[1]Innocent Badriyo Agama;Gilles Chazot;Pierre Kamgang-.Pure forsterite in Nyiragongo lavas:evidence for subsolidus oxidation of volcanic rocks)[J].地球化学学报（英文版）,2022(01):12-23
A类：
forsterite,Nyiragongo,olivines,deuteritic,canic
B类：
Pure,lavas,subsolidus,oxidation,volcanic,rocks,Some,from,volcano,Democratic,Republic,Congo,highly,crystals,These,made,two,phases,dark,backscattered,electron,images,pure,grey,Mg,poor,areas,oxides,Calculation,initial,confirms,that,they,primary,separation,different,compositions,enriched,SiO2,but,contains,lower,amounts,CaO,than,agreement,expected,partitioning,these,elements,related,Iron,formed,around,inside,during,oxidized,environment,their,evolution,We,propose,this,occurred,recrystallization,under,fO2,conditions,after,cooling,It,provides,evidences,circulation,fluids,gas,inducing,processes,occurring,large,cone,relation,presence,shallow,magma,chamber,connected,permanent,lake
AB值：
0.492938
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