Mesozoic vein-type Pb-Zn mineralization in the Pyrenees: Lead isotopic and fluid inclusion evidence from the Les Argentières and Lacore deposits

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• 作者：Marguerite Munoz^a ; ^{margot.munoz@get.obs-mip.fr" class="auth_mail" title="E-mail the corresponding author} ; Sandrine Baron^b ; Adrien Boucher^a ; Didier Bé ; ziat^a ; Stefano Salvi^a
• 关键词：Pb isotopes ; Base-metals ; Rift basin ; Extension veins ; Pyrenees ; Mesozoic
• 刊名：Comptes Rendus Geoscience
• 出版年：2016
• 出版时间：March-April 2016
• 年：2016
• 卷：348
• 期：3-4
• 页码：322-332
• 全文大小：2094 K

文摘

The Axial Zone of the Pyrenees contains numerous sedimentary-exhalative Pb–Zn deposits formed during the Early Palaeozoic, which have been the subject of several studies. In addition to these, base-metal vein-type mineralizations are also exposed within the Axial Zone metasediments. These deposits, however, have not been investigated in depth and the timing and geodynamic context of their formation has not been specifically addressed. The vein-type Pb–Zn deposits of Les Argentières and Lacore are located in Devonian terranes of the eastern Pyrenees, south of the Mesozoic Aulus basin. They are interpreted as having been emplaced under an extensional setting. They are characterized by silver-rich tetrahedrite that occurs with Pb–Zn sulphides deposited by low-temperature NaCl–CaCl₂ brines. Lead isotopic ²⁰⁸Pb/²⁰⁴Pb and ²⁰⁶Pb/²⁰⁴Pb ratios acquired on galena show more radiogenic values compared to those from the Palaeozoic sedimentary-exhalative mineralization, thus indicating younger ages. According to the model ages, the formation of the two deposits may be narrowed down to middle Late Triassic and Late Jurassic periods, respectively, which allows us to argue in favour of the role of pre-Alpine rifting phases in hydrothermal fluids circulation and mineralization deposition in a vein system bounding the Mesozoic Aulus basin.