U-Pb geochronology and geochemistry of late Palaeozoic volcanism in Sardinia(southern Variscides)

被引:0
|
作者
L.Gaggero [1 ]
N.Gretter [2 ]
A.Langone [3 ]
A.Ronchi [2 ]
机构
[1] Department of Earth.Environment and Life Sciences,University of Genoa
[2] Institute of Geosiences and Earth Resources IGG-CNR
[3] Department of Earth and Environmental Sciences,University of Pavia
关键词
Permian volcanism; Sardinia; U-Pb geochronology; Calc-alkaline volcanism;
D O I
暂无
中图分类号
P588.14 [喷出岩(火山岩)];
学科分类号
070901 ;
摘要
The latest Carboniferous to lower Permian volcanism of the southern Variscides in Sardinia developed in a regional continental transpressive and subsequent transtensile tectonic regime.Volcanism produced a wide range of intermediate-silicic magmas including medium-to high-K calc-alkaline andesites,dacites,and rhyolites.A thick late Palaeozoic succession is well exposed in the four most representative Sardinian continental basins(Nurra,Perdasdefogu,Escalaplano,and Seui-Seulo),and contains substantial stratigraphic,geochemical,and geochronological evidence of the area’s complex geological evolution from the latest Carboniferous to the beginning of the Triassic.Based on major and trace element data and LA-ICP-MS U-Pb zircon dating,it is possible to reconstruct the timing of postVariscan volcanism.This volcanism records active tectonism between the latest Carboniferous and Permian,and post-dates the unroofing and erosion of nappes in this segment of the southern Variscides.In particular,igneous zircon grains from calc-alkaline silicic volcanic rocks yielded ages between299±1 and 288±3 Ma,thereby constraining the development of continental strike-slip faulting from south(Escalaplano Basin)to north(Nurra Basin).Notably,andesites emplaced in medium-grade metamorphic basement(Mt.Cobingius,Ogliastra)show a cluster of older ages at 332±12 Ma.Despite the large uncertainty,this age constrains the onset of igneous activity in the mid-crust.These new radiometric ages constitute:(1)a consistent dataset for different volcanic events;(2)a precise chronostratigraphic constraint which fits well with the biostratigraphic data and(3)insights into the plate reorganization between Laurussia and Gondwana during the late Palaeozoic evolution of the Variscan chain.
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页码:1263 / 1284
页数:22
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