西班牙伊比利亚地块坎塔布连带伊比利亚链Herrera单元的顺苏拉期钙碱性岩浆作用:U-Pb LA-ICP-MS锆石分析的年龄和地球动力学约束

IF 2.6 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Journal of the Geological Society Pub Date : 2023-11-03 DOI:10.1144/jgs2022-102
Urbez Majarena, José Julián Estéban, Carlos Galé, Andrés Gil-Imaz, Marceliano Lago
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引用次数: 0

摘要

伊比利亚链的埃雷拉单元(坎塔布连带,伊比利亚地块)展示了数百个钙碱性火成岩的露头,这些岩石被经典地归因于上石炭世和下二叠纪,尽管只有两个绝对的辐射年龄被报道。本文利用从一些最具代表性的露头中获得的六个新的锆石激光烧蚀电感耦合等离子体质谱年龄,为伊比利亚链内坎塔布连带延长期钙碱性岩浆活动提供了最完整的年龄库。得到的年龄范围在294 ~ 288 Ma(顺苏拉世)之间,在290 Ma有一个明显的峰值,这可归因于一个主要的岩浆活动阶段。这一结果使我们能够将这一岩浆活动与走滑构造下广泛发育的欧洲西南部钙碱性岩浆活动省进行对比和整合。因此,伊比利亚链岩浆活动及其时代可以作为与瓦里斯坎造山运动有关的挤压构造的上限和与二、三叠纪裂陷有关的伸展构造的开始的一个很好的时间标志。补充资料:分析设置(1)和分析数据:标准锆石(2)和本工作样品的锆石(3)可在https://doi.org/10.6084/m9.figshare.c.6843778上获得
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Cisuralian calc-alkaline magmatism in the Herrera Unit of the Iberian Chain (Cantabrian Zone of the Iberian Massif, Spain): Age and geodynamic constraints from U-Pb LA-ICP-MS zircon analysis
The Herrera Unit of the Iberian Chain (Cantabrian Zone, Iberian Massif) exhibits hundreds of outcrops of calc-alkaline igneous rocks that have been classically attributed to the Upper Carboniferous and the Lower Permian, although only two absolute radiometric ages have been reported. This work, with six new zircon laser ablation inductively coupled plasma mass spectrometry ages obtained from some of the most representative outcrops, provides the most complete age repository for the calc-alkaline magmatism of the prolongation of the Cantabrian Zone within the Iberian Chain. The obtained ages range between 294 and 288 Ma (Cisuralian Epoch) and show a well-defined peak at 290 Ma, which can be attributed to a main magmatic activity stage. This result allows us to correlate and integrate this magmatism within the widespread SW European calc-alkaline magmatism province developed under strike-slip tectonics. Therefore, the Iberian Chain magmatism and its age can be considered as a good temporal marker for the upper limit of the compressive tectonics associated with the Variscan Orogeny and the onset of the extensional tectonics linked to Permo-Triassic rifting. Supplementary material: Analytical settings (1) and analytical data from: the standard zircons (2) and the zircons from the samples of this work (3) are available at https://doi.org/10.6084/m9.figshare.c.6843778
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来源期刊
Journal of the Geological Society
Journal of the Geological Society 地学-地球科学综合
CiteScore
6.00
自引率
3.70%
发文量
68
审稿时长
6-12 weeks
期刊介绍: Journal of the Geological Society (JGS) is owned and published by the Geological Society of London. JGS publishes topical, high-quality recent research across the full range of Earth Sciences. Papers are interdisciplinary in nature and emphasize the development of an understanding of fundamental geological processes. Broad interest articles that refer to regional studies, but which extend beyond their geographical context are also welcomed. Each year JGS presents the ‘JGS Early Career Award'' for papers published in the journal, which rewards the writing of well-written, exciting papers from early career geologists. The journal publishes research and invited review articles, discussion papers and thematic sets.
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