南科西嘉岛的burdigalien酸火山活动:岩石学、K - Ar年代测定、古磁学

Comptes Rendus de l'Académie des Sciences - Series IIA - Earth and Planetary Science Pub Date : 2001-07-31 DOI:10.1016/S1251-8050(01)01614-7

Marie-Madeleine Ottaviani-Spella , Marielle Girard , Pierre Rochette , Alain Cheilletz , Michel Thinon

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引用次数: 14

摘要

新的流纹岩凝灰岩露头在科西嘉岛南部的弗朗科卢被发现。它与附近已知的流纹岩巴利斯特拉凝灰岩和英灰质火成岩特里帕杜利凝灰岩具有钙碱性亲和关系。用K-Ar法对这3个地层的凝灰岩玻璃进行加权平均年龄测定，结果为19.3±0.5 Ma。古地磁逆方向的相干性也表明了同步侵位，这进一步表明科西嘉-撒丁岛在19 Ma时只完成了大约一半的旋转。

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Le volcanisme acide burdigalien du Sud de la Corse : pétrologie, datation K–Ar, paléomagnétisme

A new rhyolitic tuff outcrop has been discovered in southern Corsica, at Francolu. It shares a calc-alkaline affinity with nearby, previously known, rhyolitic Balistra tuff and dacitic ignimbritic Tre Paduli tuff. A weighted mean age of 19.3±0.5 Ma has been obtained using the K–Ar method on tuff glasses from these three formations. Synchronous emplacement is also indicated by the coherent reverse palaeomagnetic directions, which further imply that only about half of the Corsica–Sardinia rotation was completed at 19 Ma.

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Comptes Rendus de l'Académie des Sciences - Series IIA - Earth and Planetary Science

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