| Reference Type | Journal (article/letter/editorial) |
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| Title | Nature et composition chimique des laves des Coirons (Ardèche) |
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| Journal | Bulletin de la Société française de Minéralogie et de Cristallographie |
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| Authors | Velde, Danielle | Author |
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| Frain de la Gaulayrie, Patricia Servane | Author |
| Year | 1974 | Volume | 97 |
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| Page(s) | 450-464 | Issue | 6 |
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| Publisher | PERSEE Program |
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| URL | |
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| DOI | doi:10.3406/bulmi.1974.6931Search in ResearchGate |
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| Generate Citation Formats |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 402371 | Long-form Identifier | mindat:1:5:402371:9 |
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| GUID | 0 |
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| Full Reference | Velde, Danielle; Frain de la Gaulayrie, Patricia Servane (1974) Nature et composition chimique des laves des Coirons (Ardèche). Bulletin de la Société française de Minéralogie et de Cristallographie, 97 (6). p.450-464. doi:10.3406/bulmi.1974.6931 |
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| Plain Text | Velde, Danielle; Frain de la Gaulayrie, Patricia Servane (1974) Nature et composition chimique des laves des Coirons (Ardèche). Bulletin de la Société française de Minéralogie et de Cristallographie, 97 (6). p.450-464. doi:10.3406/bulmi.1974.6931 |
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| In | (1974) Bulletin de Minéralogie Vol. 97 (6) PERSEE Program |
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| Abstract/Notes | The volcanic massif of the Coirons, located near the Rhône valley, is built of flows and dykes. The flows which cover mesozoic sediments are essentially of alkali basalt composition, whereas the dykes vary from analcite-nepheline basanites to quartz normative trachyandesites. Five representative samples of contrasting compositions and mineralogy (haüyne ankaratrite, analcite-nepheline basanite, hornblende basalt, trachy-andesite and mugearite) have been studied in detail by microprobe. The chemical analyses (major and trace elements) show that the majority of the lavas are magnesium-poor basalts (MgO less than 6 %) which can be interpreted as the product of amphibole + olivine + clinopyroxene fractionation of a normal (= MgO rich) basalt. The haüyne ankaratrite seems the result of contamination of a Mg-poor lava by calcareous sediments. Quartz normative rocks could also be the results of fractionation processes. |
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