{"title":"Quelques precisions sur la composition mineralogique des laves tertiaires de la province volcanique de la Presqu'île du Cap-Vert (Senegal)","authors":"Abdoulaye Dia , Jean Babkine , Michel Rollet","doi":"10.1016/0899-5362(87)90067-4","DOIUrl":null,"url":null,"abstract":"<div><p>The late Tertiary volcanism from the volcanic province of Cap Verde Peninsula includes only silica-undersaturated basic lavas: olivine nephelinites, basanites and olivine alkaline basalts. This undersaturated alkaline series is sodic and indifferentiated.</p><p>Lavas contain olivine Fo<sub>88</sub> to Fo<sub>56</sub>, clinopyroxene Wo<sub>54</sub>En<sub>34</sub>Fs<sub>12</sub> (fassaïte) to Wo<sub>40</sub>En<sub>42</sub>Fs<sub>18</sub> (augite) present both in phenocrysts and in groundmass. Plagioclase An<sub>67</sub>An<sub>48</sub> is only found in basanites and olivine alkaline basalts. The olivine nephelinite is characterized by a soda-rich nepheline (Ne<sub>77</sub>Ks<sub>16</sub>Q<sub>7</sub>). Microphenocrysts of iron-titanium oxides may form within the more differentiated lavas of the series.</p></div>","PeriodicalId":100749,"journal":{"name":"Journal of African Earth Sciences (1983)","volume":"6 3","pages":"Pages 257-268"},"PeriodicalIF":0.0000,"publicationDate":"1987-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0899-5362(87)90067-4","citationCount":"2","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of African Earth Sciences (1983)","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/0899536287900674","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 2
Abstract
The late Tertiary volcanism from the volcanic province of Cap Verde Peninsula includes only silica-undersaturated basic lavas: olivine nephelinites, basanites and olivine alkaline basalts. This undersaturated alkaline series is sodic and indifferentiated.
Lavas contain olivine Fo88 to Fo56, clinopyroxene Wo54En34Fs12 (fassaïte) to Wo40En42Fs18 (augite) present both in phenocrysts and in groundmass. Plagioclase An67An48 is only found in basanites and olivine alkaline basalts. The olivine nephelinite is characterized by a soda-rich nepheline (Ne77Ks16Q7). Microphenocrysts of iron-titanium oxides may form within the more differentiated lavas of the series.
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