西澳阿尔卑斯Dent-Blanche-Sesia单元岩浆岩U-Pb年龄

Schweizerische Mineralogische Und Petrographische Mitteilungen Pub Date : 1900-01-01 DOI:10.5169/SEALS-59281

F. Bussy, G. Venturini, J. Hunziker, G. Martinotti

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引用次数: 67

摘要

锆石和独长石的常规U-Pb年龄表明，在293 ~ 288 Ma的5 Ma短时间内，西澳高山域多个多旋回基底单元中出现了花岗岩和辉长岩侵入。这种双峰活动反映了在变薄的后瓦里斯坎大陆地壳的底部，一个上升流的地幔正在增加。

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U-Pb ages of magmatic rocks of the western Austroalpine Dent-Blanche-Sesia unit

Conventional U-Pb ages on zircon and monazite demonstrate that granites and gabbros intruded during a short time span of 5 Ma between 293 and 288 Ma in several polycyclic basement units of the Western Austroalpine domain. This bimodal activity reflects increasing underplating of an upwelling mantle at the base of a thinning post-Variscan continental crust.

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Schweizerische Mineralogische Und Petrographische Mitteilungen

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